Heath Consultants Detecto-Pak 4 (DP) - Manual (Page 38)

MAINTENANCE
100786-0 Rev. D 05/09
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internal regulator set screw clockwise to increase the gauge pressure
or counterclockwise to decrease the gauge pressure until it matches
the sticker set point pressure. Re-install the plastic hole plug.
A. TROUBLESHOOTING THE INSTRUMENT
In the event the Detecto-Pak 4 fails to perform satisfactorily, look through
the following list to try to find the reason for the malfunction and its
corrective action.
Some fixes are simple ones, such as refilling the fuel cylinder, recharging
the battery, or replacing the filter. Other corrective actions are complicated
and require mechanical and/or electronic equipment to determine their
specific causes.
1. Instrument Inoperative
a. Check battery indication, and, if reading is in red zone, recharge
battery as described in Chapter Four.
b. If battery indicator reads in green zone but instrument is still not
operational, refer to 2. Malfunction and Corrective Action (see
below).
2. Malfunction and Corrective Action
a. FUEL WILL NOT IGNITE OR STAY LIT. Check internal
regulator outlet pressure. Remove the protective cap from the
quick connector located on the front of the portable unit. Connect
the external gauge adapter to the quick connect stem on the unit
by pushing in until it snaps tightly. The gauge should the posted
pressure setting on the side and/or bottom of the instrument. With
1000 psig in the fuel cylinder. If an adjustment of the internal
regulator is required, insert an Allen- type wrench through the
access port and adjust the screw.
b. METER READOUT IS ERRATIC. Check fuel
certification. Operate with previously known fuel to ensure
that contamination is not causing the instrument’s erratic
behavior. If the 40% - 60% mix (Hydrogen - Nitrogen) is
not certified, a variance in specific combustion ratios will
cause the instrument to function unsatisfactorily. Also, if
the hydrocarbon content in the fuel is higher than 0.5 ppm
methane, reductions in sensitivity or erratic meter indications
may be experienced. Also check calibration to ensure that it is
not set too high. (See Chapter Six for Calibration Procedures.)