H-25C Instruction Manual
Instruction 3015-0216
49
6. TROUBLESHOOTING
This chapter explains how to identify and take corrective action for certain types of malfunctions.
If you find that the malfunction is due to actual failure of the instrument hardware, contact your Bacharach
representative for service. Such repairs can be made only by an authorized Bacharach service center.
6.1 Improper Use Leading to Hardware Failure
Improper use that can cause hardware failures must be absolutely avoided. Subsections 6.1.1 and 6.1.2 describe
two types of improper use against which you must take particular care.
6.1.1
Never connect 240 V power when the supply voltage selector switch is set to a 100 V range
Note: The H-25C is offered in three versions : 100 / 115 V, 110 / 220 V, 120 / 240 V power.
Connecting 240 V power to an H-25C set up for a voltage in the 100 V range will burn out the
transformer. (In some cases, only a blown fuse may result.)
If you accidentally make this mistake, check the fuse first. If the instrument does not operate after you
replace the fuse, repair will be required.
6.1.2
Never allow liquid to be sucked in
The tubing system inside the instrument includes a manifold designed to precisely divide the measured
gas flow. If you allow liquid to be sucked into the instrument, contaminants will be deposited on the
manifold surfaces, changing the division ratio so that accurate measurement will become impossible.
If there are any liquids in use in the area where the instrument is placed, or it is possible that there may
be condensation on the equipment being inspected, you must take great care in the handling of the
probe.
If any liquid is accidentally sucked in, turn the power switch OFF immediately. Then do the following:
•
If liquid did not get into the instrument's internal tubing. If the amount drawn in was small, and you
noticed it immediately, then the liquid may not have gone past the probe filter. Check the probe filter.
If the gas outlet side of the probe is somewhat wet, replace the filter after drying the tip of the probe
(the tube for introducing gas for the S-type probe and the flexible probe for the L-type probe ). If the
liquid penetrated to the cable section, remove the filter and flow air through from the connector end to
dry the inside of the tubing.
•
If liquid did get into the instrument's internal tubing In most cases where liquid has been continuously
drawn in for some time, the liquid will have entered the instrument's internal tubing system. Inspect
the disc filter in the instrument, and if there is any leakage, the instrument must be repaired by
Bacharach.
