Forma Scientific 3158 - Controller and Digital Display; Audible CO Alarm and Pilot Light; SET;SILENCE Push Button; Alarm Disable Switch

Forma Scientific, Inc.
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5-7
b. CO
2
Controller and Digital Display
The LCD digital readout on the CO
2
module continually displays the percent of CO
2
in the chamber. The setpoint is displayed when the CO
2
SET/SILENCE button is pushed.
The CO
2
setpoint is changed by pushing the CO
2
SET/SILENCE button and rotating
the CO
2
set screw to the desired percentage.
c. Audible CO
2
Alarm and Pilot Light
The audible CO
2
alarm and pilot light are activated when the percent CO
2
deviates
from setpoint by plus or minus 1% (nominal) for longer than approximately four minutes.
d. SET/SILENCE Push Button
When pushed, the SET/SILENCE button will silence the CO
2
alarm and extinguish the
alarm light. This button must be pushed to set or display the CO
2
setpoint.
e. Alarm Disable Switch (Figure 5-5)
Note: It is necessary to pull the CO
2
module out slightly to gain access to the Alarm Disable
Switch. Grasp the black plastic button on the bottom of the control module, directly
beneath the Set/Silence push button. Pull on the button until the circuit board releases
from its internal connector strip. The Alarm Disable Switch is located on the side of
the module and is clearly marked. (See Figure 5-5.) To replace the module, push
firmly until the connector strip is seated. Press the black plastic button until it snaps
into place.
When the alarm switch is in the DISABLE position, the CO
2
alarm is completely
disabled. When the switch is set to the NORMAL position, the alarm system is operative
and can be silenced by pressing the SET/SILENCE button.