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Operation H25-IR
30 Instruction 3015-4342
4.2.3 Range Selection
The H25-IR has three sensitivity ranges: SM (small), MED (medium), and LG (large). The range used
when searching for a leak depends on the size of the leak and the type of gas being monitored.
Press the RANGE button until the desired range is displayed on either the instrument’s Data Display
screen, or on the LCD of the Smart probe.
Instrument Display Smart Probe Display
NOTE: The range setting has no affect on the accuracy of the gas reading as displayed on the instrument
when making a leak-rate measurement. It does, however, change the sensitivity of the bar graph at the
bottom of the Data Display screen, the audible tone frequency as heard from the speaker, and the blink rate
of the red LED on the hand-held probe.
The “SM” range is the highest sensitivity level, and is most likely used for fluorine based gases like R134a
and most fluorine based refrigerant blends.
The “MED” range is used for chlorine and chlorine based gases like R12, R22, R123, etc. This position is
also useful for locating large R134a or other fluorine based refrigerant leaks of 1−2 Oz/yr.
The “LG” range is used to locate very large leaks.
TIP: Blowing out the test area with shop air may enable the operator to locate a large leak more quickly.
4.2.4 Setup Selection
There are four user-defined Setups that allow the operator to quickly switch between frequently used
combinations of Gas Type, Range, Feedback Mode, Setpoint, and the Auto Zero Off condition (refer to
Section
2.5 Configuring the SETUPS Function).
When first turned ON, the instrument returns to the last Setup selected. To select a different Setup, first
press the SETUP button to display the Setup Selection menu. Next, use the Up and Down buttons to
highlight the desired Setup, and then press ENT to make the selection and be returned to the Data Display
screen. The name of the newly selected Setup will appear on the Data Display screen.
NOTE: The names listed in the Setup Selection menu are user defined, and may vary from what is
shown above. The number of each setup, however, is what appears on the display of the Smart probe.
Instrument Display Smart Probe Display
SETUP NO. 1
SETUP NO. 2
SETUP NO. 3
SETUP NO. 4
Setup Name
and Numbe
r
0
.00
S
M
S
RCH (1)
Oz/yr
R134A
SETUP NO
SM SRCH
Range: SM, MED, LG
0
.00 SM
S
RCH (1)
Oz/yr
R134A
SETUP NO
SM SRCH