Heath Consultants Detecto-Pak 4 (DP) - Manual (Page 24)

O
peration
100786-0 Rev. D 05/09
A. INSTRUMENT LAYOUT AND CONTROLS.
1. FUEL GAUGE: Mechanical fuel gauge used to indicate the pressure
in the fuel cylinder.
2. IGNITION SWITCH: Pressing firmly down on the ignition switch
produces voltage across the coil in the detector cell to ignite the air/
fuel mixture.
3. METER LAMP SWITCH: Press to enable meter lamp for
backlight.
4. RANGE UP/DOWN SWITCH: These two switches are used to select
the respective ppm range. They are single press only switches and
will single step the current range to the next available range. The ppm
range will wrap around in either direction, i.e., range up from 10K
ppm will step to 10 ppm and visa versa.
**NOTE**
The detector cell must have its’ flame ignited for the meter range to follow
the range selected. If the flame has not been ignited, it is not possible to step
through the ranges and the meter will only respond on the 10 k ppm range.
This is done to prevent accidental damage to the meter movement due to
attempted ignition on a lower range or due to high sample concentrations
which would drive the meter beyond full scale.
5. SIGNAL ALARM SWITCH: Used to enable / disable the signal
set point alarms (LED and audible). A blinking LED on the signal
alarm switch indicates the alarms are enabled. The pulsating signal
and blinking LED alarms occur at approximately 35 to 45 percent
of meter full scale, regardless of which ppm range is selected. As a
safety factor, the signal alarm switch does not affect the continuous
flame out alarm.
The Detecto-Pak 4 may flame out when exposed to high gas
concentrations.
6. LOW FLOW ALARM LED: Blinking LED used to visually alert the
operator of low sample flow. Low sample flow is normally caused
by a dirty or clogged sample filter or mud in the sample probe inlet.
7. POWER SWITCH: Pressing this switch either turns on the instrument
or shuts it down. The instrument powers up in the 10K ppm range,
with the signal alarm enabled, and with the flame out alarm on. The
flame out alarm will sound until the fuel has ignited and the detector
cell has begun to warm up (approximately 10 seconds beyond pressing
the igniter).
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