Troubleshooting For 4-20 Ma Output - Emerson Rosemount 3051P Reference Manual

Troubleshooting
April 2020
WARNING
Replacement equipment or spare parts not approved by Emerson for use as spare parts
could reduce the pressure retaining capabilities of the transmitter and may render the
instrument dangerous.
Use only bolts supplied or sold by Emerson as spare parts. Improper assembly of manifolds
to traditional flange can damage sensor module.
WARNING
Improper assembly of manifolds to traditional flange can damage the device.
For safe assembly of manifold to traditional flange, bolts must break back plane of flange
web (i.e., bolt hole) but must not contact sensor module housing.
WARNING
Physical access
Unauthorized personnel may potentially cause significant damage to and/or
misconfiguration of end users' equipment. This could be intentional or unintentional and
needs to be protected against.
Physical security is an important part of any security program and fundamental to
protecting your system. Restrict physical access by unauthorized personnel to protect end
users' assets. This is true for all systems used within the facility.
6.3

Troubleshooting for 4-20 mA output

6.3.1 Transmitter milliamp reading is zero
Recommended actions
6.3.2 Transmitter not communicating with Field
Communicator
Recommended actions
78
1. Verify terminal voltage is 10.5 to 42.4 Vdc at signal terminals.
2. Check power wires for reversed polarity.
3. Check that power wires are connected to signal terminals.
4. Check for open diode across test terminal.
1. Verify terminal voltage is 10.5 to 42.2 Vdc.
2. Check loop resistance, 250 Ω minimum (PS voltage - transmitter voltage/loop
current).
Reference Manual
00809-0700-4001
Emerson.com/Rosemount