Emerson 2200S User Manual

106

If you are experiencing problems with the mA output, use Table 10-2 to identify an appropriate 
remedy. Simulation mode may also be helpful (see Section 10.11).

No output
Loop test failed

Power supply problem

• Check power supply and power supply wiring. 

See Section 10.14.1.

mA output < 4 mA

Process condition below LRV

• Verify process.
• Change the LRV. See Section 6.2.2.

Fault condition if fault action is set to 
internal zero or downscale

• Check the fault action settings to verify 

whether or not the transmitter is in a fault 
condition. See Section 6.2.5.

• If a fault condition is present, see Section 10.8.

Open in wiring

• Verify all connections.

Bad mA receiving device

• Check the mA receiving device or try another 

mA receiving device. See Section 10.16.

• Perform output simulation to locate the 

problem. See Section 10.11

Bad output circuit

• Measure DC voltage across output to verify 

that output is active.

• Perform output simulation to locate the 

problem. See Section 10.11

Output not powered 

• Check transmitter wiring. See the transmitter 

installation manual.

Constant mA output 

Non-zero HART address

• Set HART address to 0 or enable the Loop 

Current Mode parameter. See Section 10.19.

Output is fixed in a test mode

• Exit output from test mode. See Section 7.3.

Zero calibration failure

• Cycle power.
• Stop flow and rezero. See Section 7.2.

mA output consistently out of 
range 

Fault condition if fault indicator is set to 
upscale or downscale

• Check the fault indicator settings to verify 

whether or not the transmitter is in a fault 
condition. See Section 6.2.5.

• If a fault condition is present, see Section 10.8.

LRV and URV not set correctly

• Check the LRV and URV. See Section 10.20.

Consistently incorrect mA 
measurement

Scaling mismatch between transmitter 
and host.

• Ensure that the host is scaled for either 12–20 

mA input or 4–20 mA input, as appropriate to 
your installation. See Section 8.3.

Output not trimmed correctly

• Trim the output. See Section 7.4.

Incorrect flow measurement unit 
configured

• Verify flow measurement unit configuration. 

See Section 10.20.

Incorrect process variable configured

• Verify process variable assigned to mA output. 

LRV and URV not set correctly

• Check the LRV and URV. See Section 10.18.

mA reading correct at low 
currents but wrong at higher 
currents 

mA loop resistance may be too high

• Verify mA output load resistance is below 

maximum supported load (see installation 
transmitter manual).