166
Reference Manual
00809-0300-4750, Rev CA
March 2016
9.4.2
Troubleshooting ground/wiring fault
If transmitter detects high levels (greater than 5mV) 50/60 Hz noise caused by improper
wiring or poor process grounding:
1.
Verify the transmitter is earth grounded.
2.
Connect ground rings, grounding electrode, or grounding straps. Grounding
diagrams can be found in
“Process reference connection” on page 17
3.
Verify the sensor is full.
4.
Verify wiring between sensor and transmitter is prepared properly. Shielding
should be stripped back less than 10-in. (25 mm).
5.
Use separate shielded twisted pairs for wiring between sensor and transmitter.
6.
Properly connect the wiring between the sensor and the transmitter.
Corresponding terminal block numbers in the sensor and transmitter must be
connected.
9.4.3
Troubleshooting high process noise
The transmitter detected high levels of process noise. If the signal to noise ratio is less than
25 while operating in 5 Hz mode, proceed with the following steps:
1.
Increase transmitter coil drive frequency to 37 Hz
(1)
(refer to
) and, if possible, perform auto zero function (
1.
37 Hz only available on line sizes 16-in. (400 mm)
Summary of Contents for Rosemount 8750W
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Page 168: ...156 Reference Manual 00809 0300 4750 Rev CA Maintenance March 2016 Maintenance ...
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