Servomex DF-130E, Operator'S Manual

Page: 58 / 88

54 DF-150
Troubleshooting
12.1.2 Remedy Table
Remedy Description
A Check the analyzer calibration using a gas of known oxygen concentration. See page 48.
B Check to see that the Zero Calibration Value agrees with the factory value marked on the sensor. See page 48
C Check the sample delivery plumbing for leaks using the procedure described in the Sample Gas and Plumbing
Requirements section of this manual. See page 38
D
Verify that the correct voltages are being supplied to the sensor. These voltages should be checked with the cable
disconnected from the sensor.
Primary Electrodes
wht/yel (-) to wht/blk/red (+) = 1.30 +/- 0.065 VDC
Secondary Electrodes
wht/blue (-) wht/red (+) = 6.50 +/- 1.00 VDC
Voltage levels between any other combination of wires should be less than 0.1 VDC.
E Change the electrolyte using the procedure described in the Analyzer Start-up Procedure section of this manual on
page 12. Rinse the sensor with de-ionized or distilled water prior to refilling and use only Hummingbird brand of
electrolyte blue. Allow the sensor to sit for 60 minutes before starting gas flow and then allow several hours of
operation on gas to equilibrate.
G Remove and check the filter element. Replace if necessary.
H Check for contaminated plumbing. This is most easily done by examining the flow meter or the plastic outlet tubing, if
so equipped, for evidence of oil, powder, or other material that might have made its way into the analyzer.
I Remove all devices from the analyzer outputs including alarm connections, recorders, etc. Check the operation of the
analyzer with those devices removed.
J Make sure that the sample gas is consistent with the calibration of the analyzer as noted on the Calibration Log on the
inside of the door. For example, if the analyzer is calibrated for nitrogen, a helium sample gas will not be measured
accurately.
K Be sure Sensor Off switch is not pushed in.
L Contact your local Servomex Business Center for assistance.
Table 9: Possible Solutions