Pyromation Series 642 - Manual (Page 10)

Wiring Series 642
10 Pyromation, Inc.
4.2 Connecting the sensor
4.3 Connecting the measuring unit
NOTICE
Electronic parts may be damaged
► Switch off power supply before installing or connecting the device. Failure to observe this may
result in destruction of parts of the electronics.
► If the device has not been grounded as a result of the housing being installed, grounding it via
one of the ground screws is recommended.
4.3.1 HART ® connection
Connection using a transmitter power supply
HART ® connection with a transmitter power supply
Please refer to Section 4.1 "Quick wiring guide" for the terminal assignment of the sensor
connections.
If the HART ® communication resistance is not built into the power supply, a 250
Ω
communication resistor must be fitted into the 2-wire supply lines.
For connection hints, please take special notice of the documentation supplied by the
HART
® Communication Foundation, specifically HCF LIT 20: “HART, a technical
overview”.