TM 10-6665-297-13&P
1-3.3.1 Indicators (continued)
3.
Warn Light: Glows to indicate warning level concentrations of combustible gases or vapors at a
detector (Figures 1-19, 1-20, 1-21, and 5-1).
4.
Alarm Light: Glows to indicate alarm level concentrations of combustible gases or vapors at a
detector (Figures 1-19, 1-20, 1-21, and 5-1).
5.
Fail Light : Glows to indicate detector circuitry malfunctions, such as open or shorted sensor
filaments or power leads. Located on front panel of control module, all models.
6.
Meter-readout-channel Indicator Lights (CD802/832 modules): Glow to indicate channel to
which meter is responding (Figures 1-20, 1-21).
7.
Warn-channel Indicator Lights (CD802/832 modules): Glow to indicate the channel from which a
warning signal has come. Glow is steady until switched by RESET pushbutton, whereupon light
goes off if no warning signal remains, or remains on if warning level concentration of gas persists at
detector (Figures 1-20, 1-21).
8.
Alarm-channel Indicator Lights (CD802/832 modules): Glow to indicate channel from which an
alarm-level signal has come. Glow is steady until switched by RESET pushbutton, whereupon light
goes off if no alarm signal remains, or continues to glow if alarm-level signal from detector persists
(Figures 1-20, 1-21).
1-3.3.2 Controls (Figures 1-19, 1-20, 1-21, 5-1):
1.
Power On/Off Switch (pre-1977 model CD830, Figure 1-19): A push-button switch operated to
turn power to the instrument on or off. The pushbutton serves also as a lens cover for the PILOT
light. (Power is supplied to other models by connecting a power cord or cable to an external power
source.)
2.
TEST Pushbutton (all models): Operated to apply a simulated gas signal to deflect Percent L. E.
L. meter pointer full-scale, turn on warning and alarm lights, and trigger internal relays for control
module operational tests.
3.
RESET Pushbutton (all models) : Operated to switch ("unlatch") internal relays triggered by
warning or alarm signals from detector or test circuitry. Circuit logic is such that relays will not
unlatch despite operation of the RESET switch while gas concentration at a detector is above the
warning or alarm level.
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