H25-IR
Operation
Instruction 3015-5286
31
4.2.5 Volume Adjustment
A speaker at the rear of the instrument produces an audible tone whose frequency increases as the detected level of
gas increases. An earphone when plugged into the instrument’s earphone jack automatically disconnects the
speaker, allowing the operator to listen to the unit’s audible tone in high-noise environments.
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 2.5.6 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.
ADJUST SPEAKER
VOLUME
------
Oz/yr
R134A
SETUP
SM SRCH
Speaker Volume
Bar Graph
Summary of Contents for H25-IR
Page 6: ...Contents H25 IR iv Instruction 3015 5286 Notes ...
Page 26: ...Preparing for Operation H25 IR 20 Instruction 3015 5286 Notes ...
Page 34: ...Calibration H25 IR 28 Instruction 3015 5286 Notes ...
Page 43: ...H25 IR Operation Instruction 3015 5286 37 Notes ...
Page 68: ...Specifications H25 IR 62 Instruction 3015 5286 Notes ...
