Servomex DF-310E, Руководство оператора

Страница: 103 / 130

Troubleshooting and Calibration DF-310E 99
SOLUTIONS KEY
A) Check instrument performance using a gas standard of known Oxygen content (Span).
B) Check that the Analyzer zero setting matches the original factory setting. Consult the
manual or the factory to verify these settings.
C) Check the sample delivery system for leaks.
D) Verify that the correct voltages are being supplied to the sensor. These voltages should
be checked with the leads disconnected from the sensor. The voltages measured should be as
follows:
Primary Electrodes: wht/yel (-) to wht/blk/red (+) = 1.30 ± 0.065 VDC
Secondary Electrodes: wht/blu (-) to wht/red (+) = 5.3 ± 0.5 VDC
Voltage levels between any other combination of wires should be less than 0.10 VDC. If there is
any deviation from these values, contact the local Servomex Business Center
E) Change the electrolyte. Use only electrolyte supplied by Servomex. Other types of
electrolyte can damage the sensor and will void the warranty. Always rinse and drain the cell
with distilled water at least three times before refilling the sensor with fresh electrolyte. Fill the
sensor with exactly one full bottle of electrolyte (100 cc). For best results, the sensor should sit
for 60 minutes before flowing gas through it. Then allow the Analyzer to operate for several
hours on Nitrogen or other inert gas. A calibration check is recommended if performance was
poor prior to the electrolyte change.
G) Remove and check the filter element. Replace if needed.
H) Check for contaminated plumbing. This is most easily done by examining the rotameter
(if so equipped) or Tygon tubing downstream from the sensor for evidence of oil, powder, or
other material that may have made its way from the process to the Analyzer.
I) Remove any devices being driven by the Analyzer output, i.e., chart recorders, data
acquisition systems, etc. Also, disconnect anything controlled by the Analyzer alarm relays.
Attempt operation with these devices removed.
J) Ensure that the background gas is compatible with the Analyzers' current calibration.
Otherwise, select the appropriate GSF value (if equipped with the GSF option), or offset the
display readings externally by the appropriate Background Gas Correction Factor amount. See
page 79 for more information.
K) Press the key once. If the display remains unchanged, power the Analyzer down
momentarily, and then power it back up.
L) Ensure that the Analyzer has adequate sample flow.