Forma Scientific, Inc.__________________________________________________Operation
4-7
The CO
2
zero adjustment is used for zeroing the CO
2
controller to specific control
conditions. It is the only user calibration adjustment on the CO
2
module. All internal
adjustments are for qualified service personnel only.
4.5 Alarm/Monitor Module (Refer to Figure 4-5)
Overtemperature Controller and Push-to-Set Button
The overtemperature setpoint is displayed when the PUSH TO SET button on the
module is pushed. Overtemp control point is adjusted by pushing the SET button and
rotating the set screw on the module to the desired setpoint.
Overtemp Alarm and Pilot Light
The overtemperature audible alarm and pilot light are activated in the event of an
overtemp condition. Once the alarm has been activated, it can only be silenced by the
temperature in the chamber returning to normal or by readjusting the overtemp setpoint to
a value above the chamber temperature.
Add Water Pilot Light and Audible Alarm
The ADD WATER audible alarm and pilot light are activated whenever the water
level in the water jacket is low. The alarm will be deactivated only when approximately
one quart (one liter) of water has been added through the fill fitting. (See Section 3.10).
4.6 Remote Alarm Relay System
Alarm states and alarm conditions are listed on Table 4-1. When the relay is off it is
in the alarm state.
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