2808B DP Transmitters / 1B-15
TABLE 1B-B - TROUBLESHOOTING CHECKS
SYMPTOM RECOMMENDED CHECK
Low or no output:
Consistent Output Errors:
Fixed Output:
Reversed DP Readings
Erratic Output:
Check power supply for low dc output.
Check field wiring for shorts, opens, grounds or
excessive resistance.
Make sure that shutoff valves in both DP lines are fully
open and that any line bypass valve is fully closed.
Check for leaks in both DP lines.
Check for sediment in both DP lines.
Check for gas in liquid lines, or liquid in gas
lines.
For liquid level applications, make sure that the bottom
of the tank is not loaded with sediment or empty.
Check calibration adjustments using test setup.
Check that shutoff valves are fully open. Pressure
may be trapped in the connecting line.
Check that any bypass valve is fully closed.
Amplifier board may be defective.
Check that upstream side of DP device is connected to
HI side of transmitter.
Check loop wiring for shorts, opens, grounds or
intermittent connections.
Check piping for gas in liquid lines, or liquid in
gas lines.
Clogged or damaged differential aperture.
Process environment conditions (temperature, humidity,
vibration, etc.) exceed transmitter specifications.
Amplifier board may be defective.
1B.7 TRANSMITTER SPECIFICATIONS
This topic contains specifications that pertain to the Model 2808-35B Transmitter.
Specifications that are common to all Series 2808 Transmitters are contained in Section 5.
Maximum Input Ranges: 0-100 inH
2
O to 0-300 psi (see Table BC
for details)
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