Bacharach H25-IR, Operation & Maintenance Manual

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Parts &Service H25-IR
48
Instruction 3015-5286
5. Drop down the rear panel far enough to allow the top cover to clear, being careful not to stress the
cables attached to the inside of the panel.
6. Remove top cover by sliding it toward rear of instrument.
5.4.2 Fuse Replacement
The H25-IR is protected from electrical damage by a single 1 A fuse located next to the AC receptacle at the
rear of the instrument.
Items Required:

Small flat-blade screwdriver

Fuse (spare fuse located in fuse holder)
Procedure:
1. Remove AC power cord or battery from instrument.
2. Using a small flat-blade screwdriver, carefully pry the fuse holder out
from the fuse compartment.
3. Inspect the fuse for damage or check its continuity. Replace the fuse
as necessary.
5.4.3 Probe Tip Filter & O-Ring Replacement
A filter located in the probe tip is the instrument’s first line of defense against dust, dirt, and moisture from
entering the instrument’s internal plumbing and IR detector. Replace this filter as it becomes dirty. A clogged
filter is identified by a “Search Flow Fault,” “Measure Flow Fault,” or a “No Flow” fault occurring. Refer to
Section
4.3 Responding
to Fault
.
Periodically inspect the probe tube’s O-ring for signs of cracking. If this O-ring becomes defective, air could be
drawn into the instrument through the bottom of the probe tube resulting in inaccurate measurements.
Items Required:

Probe Tip Filter: Bag of 50: 0.287 in. diameter (7.2 mm)

Probe Tube O-Ring

Pin or Tweezers
Procedure:
1. Unscrew probe tip.
2. Pick out old filter with a pin or tweezers.
3. Insert new filter inside probe tip.
4. Replace probe tip.
5. Unscrew probe tube and inspect O-ring. Replace O-ring if defective.
6. Reattach probe tube.