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Automated Pressure Calibrator
HART Tasks
59
Connect to a HART Transmitter
1. Connect the test leads from the EMM to the appropriate terminals on the
HART device. Observe polarity. See Figures 14 and 15.
2. Push . The HART connection menu shows with these settings:
• 250 Ohm Resistor – When ON, EMM uses the built-in 250 Ω resistor
required for HART communication.
• Use Hart Unit – When YES, the pressure unit of the controller changes to
match the unit of the pressure transmitter.
• Write Protect – When ON, the transmitter is protected from data
changes.
3. Push . The Product scans (polls) for connected devices from addresses
0 to 65. When a transmitter is found, data is obtained. If the Product does not
detect a device, check the connections and wire polarity and then push
Connect again. If a connection cannot be made after multiple attempts,
troubleshoot the transmitter with the mA mode. See the Using the mA
Function to Test and Troubleshoot section.
HART Tasks
The HART tasks are explained in the following sections. See Figure 16 for an
overview of the menus.
Trim PV Zero
Use to zero the pressure sensor in a transmitter. The resulting offset must be
within limits by each device. The span of Primary Variable remains constant. This
command does not affect or interact with the Upper or Lower-Range Values.
1. Select (HART Tasks) on the HART Menu.
2. Select Trim PV Zero.
3. Push to zero PV.
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