Heath Consultants Detecto-Pak 4 (DP) User Manual

Page 24

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).