Transmitters Used in Industrial Process Control

Pressure transmitter (ifm)

Transmitter is a term used to describe a family of process control field devices. They receive input from a connected process sensor, then convert the sensor signal to an output signal using a transmission protocol. The output signal is passed to a monitoring, control, or decision device for use in documenting, regulating, or monitoring a process or operation.

In general, transmitters accomplish three steps, including converting the initial signal twice. The first step is the initial conversion which alters the input signal to make it linear. After an amplification of the converted signal, the second conversion changes the signal into either a standard electrical or pneumatic output signal that can be utilized by receiving instruments and devices. The third and final step is the actual output of the electrical or pneumatic signal to utilization equipment - controllers, PLC, recorder, etc.

Transmitters are available for almost every measured parameter in process control, and are often referred to according to the process condition which they measure.

Level transmitters (ifm)

Some examples.

• Pressure transmitters
• Temperature transmitters
• Flow transmitters
• Level transmitters
• Vibration transmitters
• Current, voltage & power transmitters
• PH, conductivity, dissolved gas transmitters, etc.

Output signals from transmitters, when electrical, often are either voltage (1-5 or 2-10 volts DC) or current (4-20 mA). Power requirements can vary among products, but are often 110/220 VAC or 24 VDC.  Low power consumption by electrical transmitters can permit some units to be "loop powered", operating from the voltage applied to the output current loop. These devices are also called "two-wire transmitters" because only two conductors are connected to the unit. Unlike the two wire system which only needs two wires to power the transmitter and carry the analog signal output, the four-wire system requires four separate conductors, with one pair serving as the power supply to the unit and a separate pair providing the output signal path. Pneumatic transmitters, while still in use, are continuously being supplanted by electrical units that provide adequate levels of safety and functionality in environments previously only served by pneumatic units.

Pressure transmitter
(Winters)

Many transmitters are provided with higher order functions in addition to merely converting an input signal to an output signal. On board displays, keypads, Bluetooth connectivity, and a host of industry standard communication protocols can also be had as an integral part of many process transmitters. Other functions that provide alarm or safety action are more frequently part of the transmitter package, as well.

Wireless transmitters are also available, with some operating from battery power and negating the need for any wired connection at all. Process transmitters have evolved from simple signal conversion devices to higher functioning, efficient, easy to apply and maintain instruments utilized for providing input to process control systems.

To lean more about transmitters, visit https://flowcontrol.processcontrolsolutions.com/ or call Process Control Solutions at 800-528-8997.

EIM TEC2 Electric Actuator with Model 500 Quick-Start Guide

EIM TEC2 Electric Actuator

This Emerson/EIM electric valve actuator is the next generation of the non-intrusive TEC2000 actuator. Robust and compact design that are widely used on valves for marine, oil and gas, chemical, power, and water and wastewater applications.

Features:

• Superior corrosion protection polyester powder-coating, inside and out, for all environments, 316 stainless steel cover screws, marine-grade, low copper content, aluminum provides compartment and covers with extra corrosion protection.
• Separately Sealed Terminal Chamber (STC), dual sealed, allows installation wiring to be performed without exposing electronic control components.
• Anti-condensation space heater thermostat prevents internal condensation due to temperature cycling with solid-state thermo-statically controlled to turn heater off.
• Large LCD message screen uses icons and text to display status of valve and provide diagnostic data, easy to guide operator through multi-language capable, calibration, setup, and diagnostics.
• Non-penetrating control knobs operate with vibration resistant Hall-effect switches enabling actuator calibration and diagnostics without opening covers.
• Double-reduction motor gears provide flexibility, enables worm gearing to operate at lower speeds for minimum wear and long life.
• Self-locking gearing even during declutching and manual override and valve stem cannot be back-driven under high process pressures or heavy weight of gate.

TEC2 Electric Actuator with Model 500 Quick-Start Guide:

EIM TEC2 Electric Actuator with Model 500 Quick-Start Guide from Process Control Solutions, LLC

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