Heath Consultants Detecto-Pak 4 (DP) - Manual (Page 29)

O
peration
100786-0 Rev. D 05/09
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f. Select the 10 ppm range and fine zero the instrument using the
zero controls on the top panel. Press and release a zero control to
make adjustments. Wait at least one second between zero control
presses.
**NOTE**
While in operation, it is normal for the zero to drift with ambient
temperatures and small changes in the methane background concentration.
The fine zero controls also support a “fast” mode equal to 10 single presses.
Fast mode is enabled by holding down either zero control for longer then
one second. Every second thereafter will produce the equivalent to 10 single
presses followed by a beep. Release the zero control to exit the fast mode.
The Detecto-Pak 4 should now be zeroed to within 1 ppm.
D. SHUTDOWN PROCEDURES
The following procedure must be followed in order to maintain the
Detecto-Pak 4 in good working order. This procedure should be followed
whenever the Detecto-Pak 4 remains inactive for two or more days. The
battery charging procedure is all that will change.
**NOTE**
The Detecto-Pak 4 should only be shut down and the battery changed or
charged in a nonflammable (clean air) atmosphere. Instrument should be
in 10K range.
1. Disconnect and remove the fuel cylinder from the instrument. Install
the protective cap on the fuel cylinder valve and store the cylinder in
its proper compartment in the carrying case.
2. Wait for the fuel to purge from the system tubing. The continuous
“flame out” alarm will sound when the fuel is purged and the flame
goes out.
3. Press the Power function switch to turn the Detecto-Pak 4’s electronics
off.
4. Disconnect the probe and store the instrument and probe in their
proper compartments in the carrying case, or connect the instrument to
its automatic battery charger. (See Chapter Four for battery charging
procedures.)