Communications Options User’s Guide
73
Chapter 8. HART Communications
8. HART Communications
8.1 Introduction
The Panametrics GF868, XGM868, XGS868 and XMT868 ultrasonic flowmeters may be modified to permit two-way
communication with a HART communication device. This requires the installation of a HART option card
in the flowmeter. The option card generates a 4-20 mA analog output signal that can be read by the HART device.
Proceed to the appropriate section for detailed instructions on installing and using the HART option card.
8.2 Installing the HART Option Card
To install a HART option card in your flowmeter, complete the following steps:
1.
Disconnect the main power from the flowmeter.
2.
Refer to your
User’s Manual for step-by-step instructions, and install the HART option card in
Slot 6
for a GF868
flowmeter or in
Slot 2
for an XGM868, XGS868 or XMT868 flowmeter.
IMPORTANT:
If a
MODBUS
option card is installed in Slot 5 of a GF868 flowmeter, the
HART
option card in Slot 6 will
be ignored.
3.
Interconnect the HART option card and the HART device as shown in Figure 53.
Figure 53: Option Card Wiring
WARNING!
This procedure should be performed only by qualified service personnel.
WARNING!
Failure to disconnect the power before proceeding may result in serious injury.
HART
Communications
Device
Connector
Option Card
Flowmeter
Supply
Power
24 Volt DC
1
2
+
–
250
ohms