Servomex NanoTrace DF-760E, Instruction Manual

Page: 104 / 182

100 DF-760E User Interface
7.6.10.2 Oxygen Sensor Temperature Compensation Screen
Figure 106: Oxygen Sensor Temperature Compensation Screen
Temperature changes can be automatically compensated for by using the Automatic Adjust
setting. Under this setting, the analyzer determines the optimum temperature
compensation. However, if the analyzer output appears to be drifting unacceptably, and
this drift correlates with ambient temperature change, the Temperature Compensation
feature is useful to manually correct for the temperature related drifts.
The factory (default) setting and current setting are shown. First change the Automatic
Adjust to OFF. Then use the arrow up and down keys to adjust the ‘New Setting’ for
different compensation, between 0 and 19. If the analyzer reading increases with
temperature (under compensation), then increase the set point (closer to 19). If the
analyzer reading decreases with increased temperature (over-compensation), decrease the
set point.
It is important to judge if the analyzer’s response is temperature dependent only while the
sample is an oxygen free zero gas.
7.6.10.3 Active Zero On/Off
Figure 107: Active Zero Setup Screen
The Active Zero Offset feature is designed to automatically compensate for the
analyzer’s gradual zero baseline cleanup. This gradual cleanup is natural and occurs after a
fresh startup or after a prolonged or abnormally high oxygen exposure. This feature
ensures that accurate low ppb O2 readings can be made as soon as possible after initial
startup, or after a high O
2
upset event. It is similar to the User Zero Offset feature in that a