Revision 10 ST 800 SmartLine Pressure Transmitters User’s Manual Page 63
5.4 Replacing the Communication Module
The Communication module includes a connector to the sensor ribbon cable and a connector to the
optional Display module. This section includes the procedure to replace the Communication module.
The transmitter does not have to be removed from service to replace the Comm
Module
Please take appropriate steps to avoid ESD damage when handling the
Communication and Display Module assemblies
Refer to Figure 23 for parts locations.
Figure 23 – PWA Replacement
1. Turn OFF Transmitter power (Power removal is only required in accordance with area safety
approvals. Power removal is only required in Class 1 Div 1 Explosionproof and Class 1 Div
2 environments).
When removing the Communications Module with power applied, the loop will go to
0V. Likewise, installing a Communications Module into a transmitter with power
applied will cause the loop output value to go to 12 ma for several seconds then the
loop output value will go to the configured value based on the PV input.
Installing a Display Module into a powered transmitter may cause a temporary upset
to the loop output value.
2. Loosen the end cap lock, and unscrew the end cap from the electronics side of the Transmitter
housing.
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