Analynk Custom Design Services

Analynk Wireless, in addition to their line of wireless communication products for process monitoring and control, offers custom design services for a broad range of applications in the industrial control arena.

The same engineering and design expertise that goes into every Analynk product can be channeled into specialty products or assemblies for your applications. Whether something as simple as a custom adapter board to facilitate connection between some dissimilar components or an embedded controller with a customized user interface, no application is without a solution.

• Concept
• Schematic design
• PCB design
• Firmware
• Prototyping
• Production

Share your ideas with the design team at Analynk. Combine your expertise with theirs to develop an effective solution.

Signal Alarms for Process and Operations Monitoring

Telmar 500 Series Signal Alarm
Analynk

Signal alarms provide functionality related to a monitored process condition, which serves as the input to the device. High, low, or both high and low alarm points can be set on the device. When the process condition reaches one of the setpoints, a relay changes state. The relay, rated at 5.0 amperes at 120 VAC, can be used to annunciate the alarm occurrence or activate another device to take some other appropriate action. A number of input options are available that accommodate a broad range of process applications.

• Thermocouple
• Millivolt DC
• RTD
• AC or DC Current
• Slide Wire
• Strain Gauge
• Tachometer
• AC or DC Voltage

The standalone signal alarms can be incorporated into new control installations, or added to existing control systems to expand functionality. More information can be found in the data sheet included below, or reach out to Analynk and share your signal or process monitoring challenges and requirements.

Signal Alarms for Process Monitoring from Analynk Wireless, LLC

New Hazardous Area Wireless Access Point Enclosures

Model AP 412 Hazardous Area Access Point Enclosure

Analynk Wireless has added two new entries to their line of wireless access point enclosures for use in hazardous areas. Each access point enclosure is shipped ready for installation of your access point device, with hazardous area antennas, cables, mounting bracket, and antenna cables included.

Analynk access point enclosures are preconfigured to house a specific manufacturer and model number access point. Review the product offering and see the long list of accommodated access points. If you want to use an access point not shown on the list, contact Analynk for a solution.

The new models are designed to house the Cisco 2802E and 3802E Dual Band Access Points. Data sheets for both are included below.

Analynk manufactures a diverse array of equipment utilized in establishing wireless connections between industrial process control devices. Share your wireless connectivity challenges with the experts at Analynk and get effective solutions.

Hazardous Area Wireless Access Point Enclosure from Analynk Wireless, LLC

Hazardous Area Wireless Access Point Enclosure from Analynk Wireless, LLC

Setting Up the A16000 Wireless Expansion Module

Piping & Instrumentation Diagrams in Process Control

All processes benefit from P&ID

P&ID's (Piping & Instrumentation Diagrams), or Process and Control Flow Diagrams, are schematic representations of a process control system, used to illustrate the piping system, process flow, installed equipment, instrumentation, and functional relationships among all the system components.

Intended to provide a comprehensive picture of all piping and associated hardware, including physical branches, valves, equipment, instrumentation and interlocks, the P&ID employs a set of standard symbols representing each component of the system such as instruments, piping, motors, pumps, etc. The use of standard symbols provides a universal depiction that can be read and understood by operators, technicians, outside contractors, and other similarly trained individuals.

P&ID’s can be very detailed and are generally the primary source from where instrument and equipment lists are generated, also being a very handy reference for maintenance and upgrades. P&ID’s also play an important early role in safety planning by enabling an understanding of the operating states and relationships of all components in the system.

Know Analynk Wireless - Introductory Video

Analynk Wireless is an innovative designer and supplier of wireless instrumentation for the process control industry. Instruments and equipment have been successfully implemented in numerous applications including temperature measurements, 4-20 mA bridges, discrete inputs/outputs, pulse inputs, lighting and pump controls. The company's products are used in both hazardous and non-hazardous locations. Analynk Wireless also manufactures a line of traditional wired process measurement and control instrumentation under the brand name Telmar Instruments.

Share your wireless connectivity challenges with the experts at Analynk. Combining your process knowledge with their expertise with produce effective solutions.

Comparison of 2.4 GHz and 900 MHz for Industrial Process Control Wireless Connection

Wireless transmission of measurement and control signals are the future, and present, of process control. WiFi is already prevalent in higher density environments and providing benefits of reduced cabling and more. Wireless communications also can be used to connect devices over substantial distances, even globally. This article will focus on applications of moderate to long distance that will employ point to point communications of dedicated devices. Here is an illustrated example, with level measurement instruments on storage tanks located remotely from a data monitoring station.

Example of wireless connection between remote tanks and data collection and control center

In establishing a wireless process signal connection between the two points in the example, an initial consideration will be whether to employ 900 MHz or 2.4 GHz as the radio band. There are some general implications associated with the selection.

• Signal attenuation over any distance is greater for 2.4 GHz than 900 MHz. This generally means that 900 MHz can cover a greater distance and provide a signal of sufficient strength to properly communicate.
• Atmospheric attenuation for either frequency band is about the same, with a very slight advantage to 900 MHz.
• Both frequencies require "line-of-sight" to provide predictable and reliable operation. Obstructions within that zone can degrade the signal. Any obstructions with dimensions approximating the wavelength of the signal tend to have a greater impact. The wavelength of a 2.4 GHz signal is 12.5 cm (4.52 inches), 900 MHz is 33.3 cm (84.6 inches). 2.4 GHz signals are susceptible to interference by smaller objects in the transmission path than are 900 MHz signals.
• Without getting too technical, the height of a 900 MHz antenna will need to elevated to a greater distance the that of a 2.4 GHz antenna in order to provide what is known as "free space propagation". This is related to the Fresnel Zone and has greater impact as transmission distance increases.
• FCC rules allow larger transmit power ratings for 2.4 GHz radio signals than 900 MHz, increasing the potential range for 2.4 GHz.

Evaluate your potential installations with the above points in mind. Their impact on any particular application can vary depending upon the distance, topography, and potential obstructions. Share your wireless communications challenges with the experts at Analynk Wireless. Combining your site and process knowledge with their product application expertise will produce an effective solution.

Analynk Extends Offering of Hazardous Area Access Point Enclosures

AP411 for the Meraki MR72 Wireless Access Point
is Analynk's latest addition to the product line

Analynk Wireless manufactures equipment for transmitting process control signals via WiFi, radio, satellite, and cellular networks. One of their continuously expanding product lines is the Hazalynk series of explosion proof access point enclosures for installing wireless access points in hazardous areas.

The company currently has specific models designed for simple accommodation of wireless access points from Symbol, Cisco, Meru, Meraki, Aruba, HP, and Motorola. Each model is specifically configured to house a particular model wireless access point. Antenna openings, cables, and internal mounting bracket are all coordinated to provide easy installation of the wireless access point. Explosion proof antennas suitable for the access point are included with each enclosure.

The latest addition to the product line is intended for use with the Meraki MR72 Access Point. A data sheet for the unit is included below, or you can contact Analynk for more information about this or any of their other industrial wireless products.

New Wireless Network Access Point Enclosure for Hazardous Area from Analynk Wireless, LLC

Wireless Communications for Industrial Automation Continues to Expand Because It Performs

Wireless communications capabilities for process control
extend beyond WiFi

Wireless connection between a sensor and control or monitoring station is not new anymore. Products have matured, familiarity with the technology is widespread. Certainly, there are still large swaths of industrial installations that do not utilize the technology. This can be for any number or reasons, but new industrial technology tends to follow a predictable course throughout its adoption. There will be innovators and early adopters that can justify higher risks with the prospect of great returns. Many industries and companies will wait until perceived technological difficulties with implementation are overcome and products become more mainstream and easy to apply. That is where industrial wireless is today. Assembling complete working systems is a straight forward operation. Costs are comparatively modest. It's easier to visualize a payback.

Let's review some of the benefits a wireless installation can bring.

• Safety: Wireless connections can reduce personnel exposure to hazardous environments or situations that previously required human intervention or a manual gauge or instrument reading.
• Easy Scale-up: Adding points on a network is generally a simple incremental process.
• Operational Advantage: When deployed to replace manual instrument or gauge readings, real time data for diagnostics and efficiency measurements are now available. Information that is more accurate, timely, and consistent will produce better results.
• Installation Savings: Installation of wireless connected assets has been reported to be up to 10 times less expensive than wired installation. The reduced space and planning for cables and conduit can make what were once complex and time consuming operations much quicker and easier.
• Mobility: Wireless technology allows for real time connections to mobile platforms. Whether within a plant, on the road, or on the high seas, there are wireless products that can make the connection.
• Distance: Don't just think WiFi, think radio, think satellite, think cellular. Connections can be established across very long distances using standard products from the industry.
• Conversion of Legacy Devices: Many existing in-place devices can have their wired connections replaced with a wireless version. This accommodates a staged transition from wired to wireless in facility.

Analynk Wireless manufactures a broad range of wireless communications equipment for industrial process control and automation. Share your wireless connection challenges and ideas with the experts at Analynk and start benefiting from the technology. It's not new anymore. It's mainstream.

Transmitting Multiple I/O Points Along A Single Signal Path

Analynk A16000 Expansion Module provides up to
16 I/O points for wireless transmission or reception.

Wireless transmission of process control signals is steadily increasing in prevalence throughout many industrial environments. The ease of implementation, with no long cable runs to plan, layout, install, protect, and maintain, allows wireless installations to fulfill application niches that may have been considered impractical in the past.

Analynk provides hardware that easily allows the transmission and reception of up to 16 I/O points using a single transmitter and receiver. The A16000 Expansion Module can be configured with up to four internal cards that accommodate various types of input and output signals. The process is similar to setting up the I/O on a PLC. Connect the process signals to the A16000, and the A16000 to one of Analynk's transmitter or receiver devices. Setup is straight forward and allows the installation to be operable in minimal time.

Share your wireless communications and signal transmission challenges with the experts at Analynk and get recommendations on how to best implement workable solutions.

Analynk Model A16000 RF Expansion Module from Analynk Wireless, LLC

Understanding Telecommunications Terminology

Industrial wireless communications can include satellites

If you are delving into wireless communications for process control operations and expect to go beyond the use of industrial Wi-Fi, you are likely to encounter some concepts and lexicon that may be unfamiliar. A source of recognized standard definitions for industry specific terms will serve as a useful tool for understanding the specifics of radio communications.

Federal Standard 1037C, entitled Telecommunications: Glossary of Telecommunication Terms was issued by the General Services Administration late in the last century. It was superseded in 2001 by American National Standard T1.523-2001, Telecom Glossary 2000, published by Alliance for Telecommunications Industry Solutions commonly known as ATIS). The current version of the ATIS Telecom Glossary is available for use by the public. Find the glossary website, with its search engine, and either type a term to search for in the box or browse the extensive listings in alphabetical order. It's easy to use and can help you sort out the meanings of some industry specific terms.

Analynk Wireless is a wireless communications equipment provider to the industrial process control sector. Contact the application specialists at Analynk and share your wireless communication challenges.

Screen shot of the glossary, showing search box in upper left area

Understand Fresnel Zones and Their Potential Impact On Your Process Signal Radio Transmission

Rendition of an ellipsoid, the representative shape
of a Fresnel zone

Most of us have been touched by wireless communications in the industrial process control setting. The majority of the installations are likely to be networks that operate similarly to the wireless network you may have in your home. Multiple points communicate through a network controller of some sort. The facility is flooded with signal coverage through multiple access points, so there may not be much need to consider signal propagation. Of course, this is an oversimplification. The point to be made is that, as an operator or implementer, making the actual signal connection is probably not going to be an issue in most cases.

How would you approach an application with a one mile transmission distance?

Antennas with three Fresnel zones depicted and
obstruction that is outside the primary Fresnel zone
Courtesy Wikipedia

An extended transmission distance across an outdoor area requires more understanding of signal propagation and the factors that can impede the successful delivery of your
process data from transmitter to receiver. One concept that may come into play is the Fresnel zone.

I shall avoid any deep or technical approach to Fresnel zones, as my purpose is to provide the designer, technician, or implementer, who may have limited radio expertise, familiarity with the subject at a level empowering visualization of the concept to recognize the potential for its impact upon achieving a successful project. That said, a Fresnel zone, of which there an infinite theoretical number, is an ellipsoid shaped area extending between transmission and receiving antennas.  While we often consider the transmission path between two points as the popular "line of sight", an unobstructed straight line, radio frequency transmission is more accurately characterized by Fresnel zones. Being aware of the shape of the first, or primary, Fresnel zone for your application is an important element in identifying potential obstructions. A general practice is to keep the primary Fresnel zone at least 60% clear of signal obstructions, in order to maintain high wireless link performance.

There are numerous sources of Fresnel zone calculators online, but a strong recommendation to consult with your selected wireless equipment provider is in order here. Combine their expertise at applying their products with your application knowledge to reach the best outcome.

Understand Petroleum Refining for Better Process Control Support

Oil refineries can have different specialties and function

The petroleum refining industry provides an expansive market for process measurement and control instrumentation and equipment, valves, and process analyzers. Having a basic understanding of the industry can help purveyors of instrumentation and equipment properly address customer needs, as well as recognize where opportunities may lie. Here is a summary of the types of plants and processes.

Petroleum refineries produce liquefied petroleum gases (LPG), motor gasoline, jet fuels, kerosene, distillate fuel oils, residual fuel oils, lubricants, asphalt (bitumen), and other products through distillation of crude oil or through re-distillation, cracking, or reforming of unfinished petroleum derivatives.

There are three basic types of refineries:

• Topping refineries
• Hydroskimming refineries
• Upgrading refineries (also referred to as “conversion” or “complex” refineries). 

Topping refineries have a crude distillation column and produce naphtha and other intermediate products, but not gasoline. There are only a few topping refineries in the U.S., predominately in Alaska.

Hydroskimming refineries have mild conversion units such as hydrotreating units and/or reforming units to produce finished gasoline products, but they do not upgrade heavier components of the crude oil that exit near the bottom of the crude distillation column. Some topping/hydroskimming refineries specialize in processing heavy crude oils to produce asphalt.

The vast majority (75 to 80 percent) of the approximately 150 domestic US refineries are upgrading/conversion refineries. Upgrading/conversion refineries have cracking or coking operations to convert long-chain, high molecular weight hydrocarbons (“heavy distillates”) into smaller hydrocarbons that can be used to produce gasoline product (“light distillates”) and other higher value products and petrochemical feedstocks.

Figure 1 provides a simplified flow diagram of a typical refinery. The flow of intermediates between the processes will vary by refinery, and depends on the structure of the refinery, type of crude processes, as well as product mix.

Figure 1 - Refinery Flow Diagram
Wikipedia - www.en.wikipedia.org/wiki/Petroleum_refining_processes

The first process unit in nearly all refineries is the crude oil or “atmospheric” distillation unit. Different conversion processes are available using thermal or catalytic processes, e.g., delayed coking, catalytic cracking, or catalytic reforming, to produce the desired mix of products from the crude oil. The products may be treated to upgrade the product quality (e.g., sulfur removal using a hydrotreater).

Side processes that are used to condition inputs or produce hydrogen or by-products include crude conditioning (e.g., desalting), hydrogen production, power and steam production, and asphalt production. Lubricants and other specialized products may be produced at special locations.

Temperature Measurement: Thermistors, Thermocouples, and RTDs

This post explains the basic operation of the three most common temperature sensing elements - thermocouples, RTD's and thermistors.

A thermocouple is a temperature sensor that produces a micro-voltage from a phenomena called the Seebeck Effect. In simple terms, when the junction of two different (dissimilar) metals varies in temperature from a second junction (called the reference junction), a voltage is produced. When the reference junction temperature is known and maintained, the voltage produced by the sensing junction can be measured and directly applied to the change in the sensing junctions' temperature.

Thermocouples are widely used for industrial and commercial temperate control because they are inexpensive, sufficiently accurate for many uses, have a nearly linear temperature-to-signal output curve, come in many “types” (different metal alloys) for many different temperature ranges, and are easily interchangeable. They require no external power to work and can be used in continuous temperature measurement applications from -185 Deg. Celsius (Type T) up to 1700 Deg. Celsius (Type B).

Common application for thermocouples are industrial processes, the plastics industry, kilns, boilers, steel making, power generation, gas turbine exhaust and diesel engines, They also have many consumer uses such as temperature sensors in thermostats and flame sensors, and for consumer cooking and heating equipment.

Coil wound RTD element
(image courtesy of Wikipedia)

RTD’s (resistance temperature detectors), are temperature sensors that measure a change in resistance as the temperature of the RTD element changes. They are normally designed as a fine wire coiled around a bobbin (made of glass or ceramic), and inserted into a protective sheath. The can also be manufactured as a thin-film element with the pure metal deposited on a ceramic base much like a circuit on a circuit board. 

Thin-film RTD element
(image courtesy of Wikipedia)

The RTD wire is usually a pure metal such as platinum, nickel or copper because these metals have a predictable change in resistance as the temperature changes. RTD’s offer considerably higher accuracy and repeatability than thermocouples and can be used up to 600 Deg. Celsius. They are most often used in biomedical applications, semiconductor processing and industrial applications where accuracy is important. Because they are made of pure metals, they tend to more costly than thermocouples. RTD’s do need to be supplied an excitation voltage from the control circuitry as well. 

The third most common temperature sensor is the thermistor. A thermistor functions similarly to a RTD in that it exhibits a change in resistance associated with a change in temperature. A difference between the two is that, instead of using pure metal, thermistors use a very inexpensive polymer or ceramic material as the resistance element. The practical application difference between thermistors and RTD’s is the shape of the resistance curve for the devices. The RTD is linear, whereas a thermistor is non-linear, making it useful only over a narrow temperature range. 

Thermistor bead with wires
(image courtesy of Wikipedia)

Thermistors however are very inexpensive and have a very fast response. They also come in two varieties, positive temperature coefficient (PTC - resistance increases with increasing temperature), and negative temperature coefficient (NTC - resistance decreases with increasing temperature). Thermistors are used widely in monitoring temperature of circuit boards, digital thermostats, food processing, and consumer appliances.

Developing a Useful Alarm Strategy

Industrial process at pharmaceutical plant

Industrial process control operators and designers have the capability to measure many aspects of machine operation and process performance. Determining the elements to measure, method of measurement, and how to handle and process the derived information can be challenging, but can also impact the security, performance, and safety of an operation. A plan for monitoring, reporting, and responding to abnormal process conditions, if properly developed and executed, can yield real benefits to a process operator. A protocol that is not well conceived may produce a negative operational impact by creating events that unnecessarily draw resources away from productive endeavor. That protocol, or plan, is often referred to as an alarm plan.

There are numerous forces that can influence the development and implementation of an alarm plan. Each operation must incorporate its own set of external regulatory requirements, internal procedures and policies into a complete alarm protocol. Distilling that macro description down to a workable set of procedures and response tasks is where the real work begins. There is, however, a basic framework that can help organize your thinking and focus on what is most important.

• What parameters define the process or operation?
  Produce a schedule of every non-human element that is required to make the process function. This will require drilling down through every machine and material that is part of the operation. Expect the schedule to be extensive, even huge. If it is not, consider that your analysis may not be reaching deep enough. The goal here is to create an overview of what makes the process work and provide a tool for systematically studying the process elements and gleaning possible commonalities or relationships among them. Consider disregarding things that cannot be measured, since that prevents the derivation of data for evaluation. Review the completed schedule and decide which parameters shall be measured and evaluated for proper performance.
• What level of measurement is needed for each monitored parameter?
  An assessment of the needed accuracy, frequency, and resolution for parameter measurement will help define the requirements for instrumentation or other devices used to monitor a particular item. The goal is to make sure the monitoring device is capable of detecting and delivering information of sufficient quality to make decisions.
• Define the limits of acceptability for each monitored parameter.
  Until the endpoint of the process or operation, each step is likely dependent in some way on previous steps. The output of each step becomes the input of the next. While this, in many cases, may be an oversimplification, it is important to consider the relationships between the

  

  High speed filling operation

  tasks and operations that comprise the process. Monitored parameters should relate to the successful completion of a process step, though not necessarily be a direct indicator of success. The maintenance of the parameter within certain bounds may be used as an indicator that a component of successful completion was properly attained. Defining limits of acceptability may involve an element of subjectivity and will likely be customized to accommodate the process. Each organization shall evaluate their operation and determine limits based upon intimate process knowledge and experience.
• Define abnormal operation for each monitored parameter.
  Abnormal operation may not necessarily be any value not within what is considered acceptable. Consider abnormal to be the range of values that would be cause for notification of the operator, or even automated or human intervention. Note that the definition of unacceptable or abnormal operation might appropriately include filters or defined relationships with other parameters. An example of a simple filter is a time delay. If the measured variable exceeds the specified limit for 2 seconds, it make not be significant. If the threshold is exceeded for 2 minutes, it may be cause to take action. As with the limits of acceptability, developing the definition of abnormal operation for each parameter will be customized for each process.
• Provide a defined response for every alarm occurrence.
  If it is important to monitor something, then it is likely important to do something when things get out of hand. Human executed alarm response should be concise and uncomplicated, to reduce the probability of error. Automated response should be designed in a manner that provides for functional testing on a regular basis. The scope of the response will be specific for each process, with the level of response depending upon factors determined by the process operators. Response can be as simple as annunciating the condition at a monitoring station, or as dire as shutting down part or all of the process operation.
• Review every alarm occurrence
  Each alarm event should be logged and reviewed. Consider whether the event detection and response was adequate and beneficial. If the results were less than expected or desired, assess whether changes can be made to provide improved results in the future. The alarm plan is unlikely to be perfect in its first incarnation. Be prepared to reevaluate and make changes to improve performance.

The exercise of developing a comprehensive alarm plan will help to build understanding of process operation for all involved parties. This article is but a brief synopsis of the subject, intended to get the reader on the path of developing a useful alarm plan. Your alarm plan should an extension of process operation decision making, and have a goal of enhancing safety and reducing loss.   

Learn From History - Explosion at Texas Facility

Industrial accidents range in severity and impact from minuscule to catastrophic. As operators, owners, or technicians involved with industrial operations, we all have a degree of moral, ethical, and legal responsibility to conduct our work in a manner that does not unduly endanger personnel, property, or the environment. Maintaining a diligent safety stance can be helped by reviewing industrial accidents at other facilities. There is much to learn from these unfortunate events, even when they happen in an industry that may seem somewhat removed from your own.

The U.S. Chemical Safety Board, or CSB, is an independent federal agency that investigates industrial chemical accidents. Below, find one of their video reenactments of an explosion that occurred in Texas in 2013, along with their findings regarding the cause of the incident. Check out the video and sharpen your senses to evaluate potential trouble spots in your own operation.

Contact Analynk for any safety related information you may need concerning their products.

Application Example - 900 MHz Wireless Delivery of Industrial Process Control Signal

We have a new video with an application example where wireless signal transmission provides a powerful solution. You can always get help with your applications by contacting us.

Two-Wire vs. Four-Wire Transmitter For Analog Process Measurement and Control Signals - What Really Matters?

One of many form factors of two wire transmitters
for industrial process measurement and control
Courtesy Telmar Instruments

Transmitters are everywhere in process control. They take a sensor output signal,amplify and condition it, then send it to monitoring and decision making devices. The most common analog electrical signal used for transmitting process control signals is a 4-20 mA (milliampere) current flow. It has succeeded in its adoption for a number of reasons, not the least of which are its resistance to interference and ability to transmit a signal across a substantial length of cable.

Aside from the sensor connection, there are two basic wiring schemes for these devices. The simplest employs just two conductors to transmit the signal and coincidentally provide operating power for the transmitter electronics. This type of transmitter is commonly referred to as a "loop powered" or "two-wire" device. A DC power supply, typically 24 volts, is wired in series with the 4-20 mA output signal and the transmitter derives its operating power from this source. Loop powered devices generally consume very little power, but process designers must consider the total resistance imposed on the loop by all connected devices. The cable, unless the length is monstrous, poses a measurable but comparatively small resistance. Careful consideration should be given to the resistance imposed by receiving devices, especially if there are several in series, receiving the loop signal. The output voltage of the power supply and the maximum tolerable voltage of the connected devices will serve as limiting factors on loop instrument quantity. Where they can be applied, two-wire transmitters offer a straight forward solution for delivery of analog process measurement signals.

A "four-wire" transmitter gets its name from, you guessed it, the two pairs of wires used to provide operating power and a signal transmission path. Provided with a separate power source, possibly even 120 volts AC, this transmitter type will often be found in applications where the sensor may have power requirements that cannot be met with the limitations inherent in the loop powered device. While it may seem that the separate power supply negates the need to consider total resistance load on the signal loop, this is not the case. The signal loop still will be limited by the DC power supply that serves as the driving force of the loop.

In many cases, the question of "two-wire or four-wire" will be answered by the transmitter manufacturer. Since the two-wire scheme is a less burdensome installation, it may be the only product offering when a suitable device can be designed for an application. That said, a diligent search will probably find two and four-wire versions of transmitters for almost every application.

What are some decision making guidelines?

• Some types of transmitters have sufficiently high power requirements that they cannot be loop powered. In this case, four-wire may be the only option.
• For low resistance loads, use 2 wire transmitters for a simpler installation.
• Allow some headroom in the loop resistance to accommodate at least one added receiving device in the future. For example, a temperature signal may serve as an input to a controller now, but need to service a recording device potentially added in the future.
• Distance should not be mindlessly overlooked, but is generally not a limiting factor, as most installations would be compatible with the distance limitations for two- or four-wire device output signals. 
• When signal transmission distances become unwieldy, due to cabling costs or other factors, consider a wireless transmitter instead of a wired device.

The important aspect of applying 4-20 mA signal loops is to maintain the capability to add another receiving device to the circuit. The use of information in the form of process signals has been growing for a long time and is likely to continue. It is certainly easier to wire an additional device into an existing loop, than to install an additional sensor, transmitter, power supply, and cabling to accommodate the additional device. 

Analynk provides wired and wireless solutions for delivering analog process control signals. The wired devices carry the company's Telmar brand name. Wireless solution products carry the Analynk and Sensalynk brand name.

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Creating Wireless Process Connections Is ABC Simple

Industrial wireless is not new, it is a mature technology. With the products available today, implementing a wireless process signal connection is no more difficult than installing a simple process controller. Analynk is a part of that simplicity, manufacturing modular receivers, transmitters, and companion products enabling operators at any scale to effectively deploy a 900 MHz or 2.4 GHz wireless solution.

There are many instances where a wireless solution provides distinct advantages over wired installations. Understanding the simplicity of wireless installations, and that product based solutions are readily available, can unleash your ingenuity at solving process control challenges using wireless communications. A previous article may help you recognize opportunities to avoid expensive or difficult cabling, or actually make connections you thought were impossible.

Let's look at a basic installation that measures temperature at a remote location (the measuring station) and transmits the signal to your office (the monitoring station).

Here is all you need:

• Power supply to operate the temperature measurement instrument and the Analynk transmitter. Analynk transmitters consume little power and can be provided with photovoltaic power supplies, if needed.
• Temperature measuring device of your choice with 4-20 ma output signal and up to two discrete outputs. It does not need to be wireless. 
• Analynk transmitter located at the temperature measurement station to convert the 4-20 ma temperature signal to digital format and send it to the monitoring station. The connection between the temperature measuring device and the Analynk transmitter is wired.
• Analynk receiver located at the monitoring station to receive and decode the signal from the Analynk transmitter, converting it back to 4-20 ma. A wired connection between the receiver and your monitoring or recording equipment delivers the 4-20 ma temperature signal to its destination.

The simple wiring connections to the transmitter and receiver differ little from those of most other devices (see the ABC’s on the illustration).

A - Connect a power source to operate the unit
B - Connect the input signal (if it's a transmitter) or output signal (if it's a receiver).
C - Connect discrete inputs (if it's a transmitter) or outputs (if it's a receiver).

Wiring diagram for Analynk Model A753 wireless transmitter

Setting up the transmitter and receiver takes no more technical knowledge than other modern control devices. You follow instructions to set a few parameters, calibrate, and put the system into operation.

You can gang inputs and outputs together with an expander module and use a single transmitter and receiver to deliver multiple sensor signals. All units are DIN rail mounted with removable terminals for simple, organized installation and replacement.

Wireless connections can expand your operating capabilities, as well as business opportunities. Analynk has made the implementation easy. Use your creativity and ingenuity to bring new applications to your operation. Contact Analynk anytime to discuss your ideas or get the help you need to put your ideas into action.

Process Monitoring and Control - Where You Can Make Good Use of Wireless

Analynk empowers industrial process operators at any scale to bring the functional benefits of industrial wireless communication to their applications. The company provides easy to implement wireless hardware solutions that can be economically applied to even as single data point.

Talk a look at our short video for some application suggestions. Ramp up your ingenuity and develop ideas for your facility or operation. Contact the experts at Analynk for solutions. We enjoy hearing new and creative ideas for meeting process control challenges with wireless.