
Instruction Manual
Appendix A: Unity Gain Mode
The Unity magnetic control is available during CAL MODE to allow the ZERO and SPAN adjustments to be centered within their range. This is similar to setting a potentiometer so the wiper terminal is exactly halfway between the clockwise and counterclockwise terminals. this is identified as the UNITY GAIN mode. In UNITY GAIN the ZERO controls have a ± 15% of full scale adjustment range. For example, in UNITY GAIN, if the sensor's ZERO output has drifted so high that it reads 15% with ZERO gas applied, the DOWN ZERO magnetic control could still bring the
In UNITY GAIN the SPAN controls have a .5 to 2 adjust- ment range. For example, in UNITY GAIN, if a sensor's output sensitivity has been reduced to the point where 50% SPAN gas provides only a 25% reading, the UP SPAN magnetic control could still calibrate the reading to the proper value of 50%. However, it will be at the end of its adjustment range.
Appendix B: L.C.D. Readout Calibration Procedure
The 3 1/2 digit LCD meter span and decimal points may be configured for full scale ranges such as 1- 100,
Appendix C: End of Sensor Life Indication
Old sensors near the end of their service life require higher gain settings.
aspan value
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