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16 Monitoring tcGas Calibrating the tcGas Transducer
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Press CAL on the module until the light above the key comes on and wait (three - 20 minutes) for
the “calibration complete” message to appear on the monitor. Alternatively, in the
Setup tcGas
menu, select Start Calibration. To save gas on 15210B, if the timer control dial is not in the
start position when the monitor displays the calibration complete message, turn the dial counter-
clockwise to the start position. For TCC3, if the green light is still flashing when INOP “tcGas
CalRunning” disappears, press the green arrow button again.
Calibration Failure
If calibration fails, the monitor displays “...tcGas transducer or Cal Unit malf” and the
CAL FAILED INOP for the measurement.
Troubleshooting tcGas Calibration
Perform each of the following steps, in order, until calibration is successful.
1 Check the calibration unit, then recalibrate, remembering to turn on the gas supply on the
calibration unit. If the pressure indicator reading is in the out of gas zone, there is insufficient gas
in the cylinder. Connect the gas tubing firmly to the calibration unit and to the module’s
calibration chamber.
2 If Step 1 fails, check whether you need to activate the transducer (necessary if the electrolyte has
dried out or if you have a new transducer). Remembrane the transducer, removing the old
membranes, and cleaning the transducer head thoroughly.
3 Calibrate a second time.
4 If Step 2 is unsuccessful, calibrate again. This calibration may be required to stabilize the
electrochemical system in the transducer.
5 Only if the above steps are unsuccessful (you have activated and remembraned the transducer and
calibration has still failed twice), replace the transducer.