D.2 Connect with a field communicator
A connection from a field communicator to your transmitter allows you to read process data, configure the
transmitter, and perform maintenance and troubleshooting tasks.
Prerequisites
The following HART device description (DD) must be installed on your field communicator: Density Gas
Viscosity Meter Dev v2 DD v1 or later.
You can connect a field communicator to the primary mA terminals on the transmitter, to any point in a local
HART loop, or to any point in a HART multidrop network.
CAUTION
If the transmitter is in a hazardous area, do not connect your field communicator to the mA terminals on
the transmitter. This connection requires opening the wiring compartment, and opening the wiring
compartment in a hazardous area can cause an explosion.
Important
If the HART security switch is set to
ON
, HART protocol cannot be used to perform any action that requires
writing to the transmitter. For example, you cannot change the configuration, reset totalizers, or perform
calibration using a field communicator. When the HART security switch is set to
OFF
, no functions are
disabled.
Procedure
1. To connect to the transmitter terminals:
a) Remove the transmitter end-cap.
b) Attach the leads from your field communicator to terminals 1 and 2 on the transmitter and add
resistance as required.
Your field communicator must be connected across a resistance of 250–600 Ω.
Tip
HART connections are not polarity-sensitive. It does not matter which lead you attach to which
terminal.
Using the field communicator with the transmitter
Configuration and Use Manual
March 2021
MMI-20020954
180
Micro Motion Gas Specific Gravity Meters (SGM)