Selecting a Pressure Transmitter
Selecting the correct pressure transmitter can be a complex task, and choosing the wrong one can make the operation of your equipment inaccurate, and possibly even dangerous. Also, instruments require ample lead time, and a mistake can throw a wrench into a schedule and delay system startup. Here are a number of important things to consider when determining the proper device for your application:
1. Determine your measurement requirements and the type of transmitter you will need. Are you measuring positive pressure or negative pressure? Are you taking stand-alone measurements, or pressure differentials?
2. Assess the operating conditions where the pressure transmitter is to be installed. What is the medium being measured, and are exposed parts compatible, or capable of withstanding, this medium? Steam, refrigerants, chemicals, etc., require special considerations. Also take into account whether your device will be exposed to vibration, shock, moisture, electrical interference, or extreme temperatures.
3. Carefully determine the correct pressure range before selecting a transmitter. Choosing a device with the wrong range can significantly throw off your readings.
4. Choose the proper location for your transmitter, and determine whether it should be blind or indicating. It should be accessible and must have proper vertical and horizontal clearances so it can be calibrated and serviced easily.
5. If your transmitter is to be installed outdoors or in a corrosive environment, make sure it properly sealed and protected.
6. Check and double check your make and model number numbers to avoid the major headaches that can result if errors are discovered late in the game. This might seem like a no-brainer, but it is one of the most commonly occurring problems.
7. Choose your communication protocol and hardware wisely. Make sure your pressure transmitter is capable of communicating critical information and operates optimally over your chosen data highway.
Omni Instrumentation & Electrical Services, Inc., located in New Jersey and Maryland, is a premier instrumentation and electrical contractor, providing superior total care solutions since 1986. Services include instrument installation, tubing installation, instrument calibration, control loop testing, startup and commissioning, power and lighting, process control wiring, BMS wiring, telecommunications and data wiring, fire alarm wiring, security wiring, process network wiring, and control panel fabrication. Omni Instrumentation & Electrical Services, Inc., is certified in Foundation Fieldbus, Profibus, DeviceNet and ASI-Bus installation.