Measuring The Leak Rate; Measuring The Ppm Level; Logging Measured Readings - Bacharach H25-IR Operation & Maintenance Manual

Operation

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.
3. While observing the gas reading, hold the probe tip over the leak source until the reading stabilizes. In
the examples below, a leak rate of 2.80 Oz/yr of R134a is being measured.
Instrument Display

4.2.8 Measuring the PPM Level

The H25-IR can be used to measure a gas's ppm level within a confined space, and display that level within the
range of 0 to 1,000 ppm. Set up the instrument to measure ppm levels as follows:
NOTE: Although the H25-IR can display ppm levels above its rated range of 0 to 999 ppm, the accuracy of the
reading above 999 ppm is unspecified. Refer to Section 6Troubleshooting.
1. Set up the instrument's Leak Units to ppm as described in Section 2.4.2 Leak Unit.
2. Press the MODE button to display "MERS" at the bottom of the Data Display screen or "MEASR" on the
Smart probe.
3. Allow the instrument to sample fresh air. The gas reading must be "00.0" before proceeding. Press the
ZERO button to zero the gas reading while sampling fresh air.
4. Place the probe in the area to be measured. In the example below, 38.0 ppm of R134a is being
measured. Note that the display is auto ranging, causing the decimal point to turn off above 99.9 ppm.
Instrument Display

4.2.9 Logging Measured Readings

The H25-IR can log up to 50 measurements, which can then be viewed and analyzed at a later time. Each
logged measurement is given a date & time stamp for identification. The measurements are stored in non-
volatile memory, and will not be erased when the instrument is turned OFF.
With the instrument in its Measure mode, press the LOG button to log the measurement that is currently being
displayed on the Data Display screen. Note that logged data is stored on a first-in, first-out basis. Once 50
measurements have been stored, the newest stored measurement overwrites the oldest.
NOTE: Only non-zero measurements will be logged.
32
Smart Probe Display
Oz/yr
2.80 SM
R134A
MEASR(1)
SETUP
SM MERS
Smart Probe Display
ppm
38.0 SM
R134A
MEASR(1)
SETUP
SM MERS
H25-IR
Instruction 3015-5286