Riken Keiki GD-3EC, Technical Manual

Page: 127 / 177

7. Maintenance 7-4 Performing calibration
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5 Introduce the span adjustment gas, then press the SET
key.
The SET key is disabled if the reading is less than 10 % of full
scale.
6 Press the ▲ or ▼ key to adjust the reading to match the
concentration of the gas introduced, then press the SET
key.
Span adjustment starts for the H range.
7 Check the H range span adjustment result.
・ If H range span adjustment is
successful
[PASS] is displayed, followed by
the calibration concentration
upper limit.
・ If H range span adjustment is unsuccessful
[FAIL] appears.
8 Press the SET key.
Returns to the [2-2] display.
NOTE
 If span adjustment is unsuccessful because the reading fluctuates significantly compared to the
concentration of the gas introduced, [FAIL] appears. If this occurs, span adjustment was not performed.
 If span adjustment was unsuccessful, check whether the correct concentration span adjustment gas was
introduced and confirm that there are no leaks in the gas calibration equipment If span adjustment was
not performed correctly, repeat span adjustment.
 If span adjustment was performed correctly or if span adjustment fails even when repeated, the gas
sensor may have reached the end of its service life. Turn off the power and contact Riken Keiki.