Bacharach H25-IR - Manual (Page 37)

H25-IR Operation
Instruction 3015-4342 31
TIP: If additional volume is required, connect an amplified speaker to the earphone jack.
Adjust the speaker and earphone volume as follows:
1. Press the VOL (volume) button to display the ADJUST SPEAKER VOLUME screen.
2. Press
the Up button to increase volume, and press the Down button to decrease volume. Pressing the
Left button sets the volume to minimum, while pressing the Right button sets it to maximum. A visual
indication of the volume level is provided by a bar graph at the bottom of the Data Display screen.
3. Press ENT to save the new volume level.
4.2.6 Searching for a Leak
Use the following procedure to locate a leak.
1. Press the MODE button to display “SRCH” at the bottom of the Data Display screen or on the Smart
probe.
The Search Mode is used to locate leaks because of its ability to auto-zero or block out background
contamination. This greatly reduces and/or eliminates false positives while retaining the sensitivity to
quickly locate small to large leaks.
TIP: The auto-zero function can be turned OFF, or configured to automatically turn OFF at a user-
defined leak rate. Refer to Section “2.6.6 Search Auto Zero”.
2. Begin leak testing by moving the probe tip slowly toward the area being tested. Pinpointing leaks
requires continuous probe movement. (2 inches [50 mm] per second is recommended as specified in
SAE J1627 and J1628.) When the gas being monitored is detected the instrument responds in a
positive manner as follows:
 The gas reading increases
 The bar graph at the bottom of the Data Display screen moves upscale
 The audible tone from the speaker increases in frequency
 If the hand-held probe contains an LED, its blink rate will increase
3. If the probe tip is held over the leak source the instrument will zero-out the leak, causing all gas
indicators to return to their idle state. Briefly moving the probe away from the leak allows the instrument
to quickly regain its sensitivity. Returning to the leak source will again cause the instrument to respond
in a positive manner.
4. By repeating Step 3, the instrument will reliably and repeatedly pinpoint the leak with each pass over
the leak source.
4.2.7 Measuring the Leak Rate
After finding a leak, a measurement can be made to determine its leak rate as follows:
1. Press the MODE button to display “MERS” at the bottom of the Data Display screen or “MEASR” on the
Smart probe.
2. Allow the instrument to sample fresh air. The gas reading must be “0.00” before proceeding. If
necessary, press the ZERO button to zero the reading while sampling fresh air.
ADJUST SPEAKER
VOLUME
------
Oz/yr
R134A
SETUP
SM SRCH
Speaker Volume
Bar Graph