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General Information Model 9700
TELEDYNE BROWN ENGINEERING
Analytical Instruments
4.1 Operating Controls and Indicators
• The POWER toggle switch is used to turn the combustible gas
analyzer ON and OFF.
• The meter displays the gas concentration at the detection point
as a percentage of the combustible gas and is graduated from
0–5% combustibles.
• The green SAFE light is illuminated during normal operation
and indicates that the combustible gas sensing element is
operating.
• The red ALARM light is illuminated either when the
combustible gas concentration rises above the adjustable
ALARM setpoint, or in the event of a sensing element circuit
malfunction. The two conditions can easily be distinguished by
observing the meter reading. In a gas alarm, the meter pointer
will be upscale above the predetermined level. In a malfunction
type alarm, the meter needle will be pegged downscale below
zero. A malfunction alarm will be caused by low or no sensing
element current.
• (optional) The blue FAILURE light is illuminated in the event
of failure of the detector element. The internal buzzer will also
be activated with this type of failure.
• (optional) The amber CAUTION light is illuminated when the
gas concentration rises above the adjustable CAUTION
setpoint.
• The BUZZER toggle switch enables the internal buzzer to
sound if the unit goes into alarm.
Note: This switch is a three position switch. For units that do not contain
a "CAUTION ALARM" , this switch must be in the "full up" position
to activate the AUDIO-BUZZER ALARM. The center and "full down"
positions are "OFF" conditions.
• The AUTO/MAN toggle switch determines the mode of the
alarm relay. In the AUTO mode, the alarm relay will pull in and
drop out automatically as the gas concentration goes above and
below the setpoint. In the MANual position, the alarm relay will
be in a latching mode such as to pull in if the gas concentration
goes above the setpoint. The alarm system can be reset to
normal by switching back to AUTO.