Panametrics DigitalFlow XGF868i, Startup Manual

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Chapter 1. Installation
4 DigitalFlow™ XGF868i Startup Guide
1.5 Installing Temperature and Pressure Transmitters
Optional temperature and pressure transmitters may be installed near the ultrasonic transducer ports as part of the
flowcell. Be sure to observe the siting requirements given earlier in this chapter. These transmitters should send a
0/4-20 mA signal to the XGF868i. In turn, the XGF868i must be fitted with a suitable option card to process the signals
and to provide the required 24 VDC power to the transmitters. Any desired transmitters or sensors may be used, but
they must have an accuracy equal to ±0.5% of the reading or better.
Note: Resistive Thermal Devices (RTDs) are a good choice for measuring the temperature.
Typically, a 1/2” NPT or 3/4” NPT female threaded port is used to mount the transmitters on the flowcell. If the pipeline
is insulated, the coupling may need to be extended to provide convenient access. Of course, other types of mounting
ports, including flanged ports, may be used for the transmitters.
Figure 1 below shows a typical mounting arrangement for the pressure and temperature transmitters. The
temperature sensor should extend into the pipe by 1/4 to 1/2 of the pipe inside diameter.
Figure 1: Typical Temperature/Pressure Transmitter Mounting
Temperature Transmitter
RTD
Thermowell
Coupling
Pressure Transmitter
Isolation Valve
Flowcell Wall