Wednesday, October 18, 2017

Six New Non-Contact Level Transmitters From Krohne

industrial radar level transmitters
Non-contact radar level measurement
Image courtesy Krohne
Krohne, globally recognized manufacturer of process measurement and control equipment, has added six new models to their line of non-contact level measurement instruments. The radar level transmitters now are available in models with 6, 10, 24, and 80 GHz emitters for use across a wide range of industries and applications involving liquids and solids.

Krohne's line of Optiwave radar level transmitters are two-wire loop powered devices employing FMCW (Frequency Modulation Continuous Wave) radar technology to deliver accurate and reliable results, even in challenging operational situations. Various antenna configurations are available for measurements up to 100 meters. A host of other features are included to provide ease of use and reliable service.

Each of the new models is tailored to provide best in class performance in a targeted range of applications. More technical data is provided in the matrix included below. Share your level measurement challenges with process instrumentation specialists, combining your own knowledge and experience with their product application expertise to develop an effective solution.

Tuesday, October 10, 2017

Two-Wire vs. Four-Wire Transmitter For Analog Process Signals - What to Consider?

industrial I/O modules for process signal conditioning
I/O modules are an integral part of process signal connectivity.
Image courtesy of Acromag
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.
An 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.

Share your process measurement requirements and challenges with process instrumentation experts, leveraging your own process knowledge and experience with their product application expertise to develop complete and effective solutions.


Wednesday, October 4, 2017

Inside Look at Multichannel Refractometer User Interface

K Patents, globally recognized manufacturer of process refractometers for liquid analysis, offers a multichannel user interface providing connectivity for up to four refractometers. The model MI provides environmental protection and industrial computing and intelligence to deliver maximum performance and ease of use. The company provides this list of primary features.
  • High-performance, industrial computing system
  • Expandable system and connectivity for up to four (4) PR-43-G refractometers and eight (8) I/O modules
  • Environmentally sealed IP67, Type 4X (door closed), IP 66 (door open), rugged 316 stainless steel enclosure. Also for demanding field and outdoor conditions (-40−50°C, -40−122°F)
  • Prism wash diagnostics and control
  • Trend display that shows one or two graphs over a selected period of time.
  • Embedded measurement apps: The apps are small programs that give different types of measurement data and functionality
  • Modules, e.g. mA-output and mA-input module
  • 10” graphical touchscreen color display
  • 21 CFR 11 compliant user identification and management, electronic data records and data-logging, event log/audit trail.
The video provides a visual tour of the interface and behind the panel layout. Share your industrial liquid process analysis challenges with process measurement experts. Leverage your own knowledge and experience with their product application expertise to develop effective solutions.

Wednesday, September 27, 2017

Signal Splitter Solves Multiple Device Connection Challenge

distributed I/O modules
Selecting the right I/O modules can solve signal
transmission challenges.
Image courtesy Acromag
Industrial process measurement and control requires the transmission of signals from point to point with no significant distortion. Even with the growing prevalence of wireless signal transmission, over-wire transmission of signals is still a primary means of connecting one device to another.

In the cabled process measurement and control world, the 4 to 20 milliampere signal is generally considered the standard for transmitting analog control and measurement signals over any distance.There is an immense array of instrumentation and controllers available for use with 4-20 mA signals, so expertise in routing and delivering those signals should be part of your process measurement and control skill set.

Like just about everything else, routing 4-20 mA signals presents its own set of challenges that require some thought and planning to overcome. Electrical interference is always a concern and must be prevented from impacting the operation of measurement and control devices. Additionally, there must be sufficient power in the signal loop to accommodate the resistance load of connected devices. There are other considerations, but I'm going to focus on these two.

One scenario that can present significant issues is multiple devices requiring connection to the same signal, but with great distance between them. A simple solution can be implemented using an isolated signal splitter.

Features of these units making them an attractive, single box, solution:
  • One 4-20 ma input channel for the measuring or controlling device.
  • The input signal is retransmitted as identical isolated 4-20 ma signals
  • Galvanic isolation from input to output
  • Isolation between channels for safety and increased noise immunity. Fault in one output channel does not impact the operation of the other channels.
  • Reliable operation in industrial environments, with protection from RFI, EMI, ESD, and surges.
  • Low radiated emissions in accordance with CE requirements. 
  • DIN-rail mounting of the unit
  • Plug-in terminal blocks
If you have a very long signal loop, connecting multiple devices, consider breaking the devices into two groups that may allow for a substantially shorter cable length for each group. Connect each group to one of the isolated outputs of the splitter, giving each group of instruments the identical signal without the risks or impractically of an excessively long cable run.

There are other devices available that may combine special characteristics that solve your signal transmission and processing challenges. Contact a product specialist and discuss your existing or anticipated project requirements. Combine your process knowledge and experience with the extensive product knowledge of a professional sales engineer and produce the best possible outcome.

Wednesday, September 20, 2017

Instrument Specialties is Ready to Help Hurricane Impacted Partners

Industrial Instrumentation, Valves
and Municipal Equipment

Instrument Specialties is Ready to Help

As our Florida industry partners rebuild, ISI offers special emergency services for your plant. 
As we Floridians begin to recover from the damage of Hurricane Irma,  ISI Technicians & Field application support engineers, are available to you.  We have support personnel located in all major metropolitans areas including: Orlando, Miami, Ft. Myers, Tampa, Lakeland, and Jacksonville.
During September ISI will waive most emergency and expedited service fees, related to our products, for hurricane related issues. These include:
  • Technical Field Support
  • Emergency Onsite Field Support
  • Evaluation and Testing Fees
We are here for you, and ready to help get your plant up and running ASAP.
Contact Info:
Instrument Specialties Inc.:
3885 St. Johns Parkway
Sanford, FL 32771
Email: Click Here

Tuesday, August 15, 2017

Freezeless Control Valve

dump valve control valve for separator vessels
Model 1451 "Freezeless" Control Valve installs
with trim immersed in liquid.
Image courtesy SOR
There are almost uncountable control valve variants available in the industrial marketplace. Some have applicability over a wide range of settings, with size, materials of construction, or pressure rating being their only distinguishing factor. Others are tailored to comparatively narrow performance bands or applications, delivering specialized performance where it is needed.

SOR, global manufacturer of fluid measurement control components, fills an application niche with its "freezeless" control valve. Intended primarily for use on oil production equipment, the compact model 1451 control valve mounts directly to a separator or scrubber in a manner that places the plug and seat submerged in the process liquid. The liquid acts as a heat source to keep the valve trim from freezing.

More information is provided in the data sheet below. For best results, share your fluid measurement and control challenges with application specialists, combining your own process knowledge and experience with their product application expertise to develop and effective solution.

Friday, August 11, 2017

MSA Ultima X5000 Gas Monitor is Packed With Advances

The Ultima X5000 Gas Monitor from MSA incorporates a number of patented features, along with advanced design, that deliver superior performance and lower ownership cost for monitoring and detecting toxic and hazardous gas in industrial settings. Take two minutes and watch the video to learn more, or contact a product specialist with your application challenge for an effective solution.