Bacharach H25-IR - Manual (Page 32)

Calibration H25-IR
26 Instruction 3015-4342
Calibration is best performed at or near full scale, it can however, be done at any concentration and ideally in
the range where maximum accuracy is desired down to, but not below, 100 ppm.
The instrument should be operating for at least 30 minutes prior to performing a calibration.
Verify that the current CAL Factor is set to 1.000 by selecting the Main Menu > CAL DATA > CAL FACTOR
function. If necessary, reset the CAL Factor to 1.000. Refer to Section 3.4.3 Adjusting the CAL Factor.
With the instrument operating in its ppm measurement mode (refer to Section 4.2.8 Measuring the PPM Level),
insert the probe tip into the gas-sample bag and allow the instrument to sample until the ppm reading on the
display is stable. At this time record the ppm reading. The new CAL Factor is computed by dividing the known
gas concentration value by the measured value. Typically this number will be between 0.95 and 1.05. Enter the
new CAL Factor as described in Section 3.4.3 Adjusting the CAL Factor.
IMPORTANT! If the instrument is switched back to measuring the leak-rate, then the instrument must be
recalibrated on the gas being measured.
3.4.3 Adjusting the CAL Factor
Display the Calibration Data menu by first pressing both the ENT and ESC buttons on either the instrument’s
front panel or Smart probe at the same time to display the Main menu. Next, use the Up and Down buttons to
highlight “CAL DATA”, and then press ENT to display the Calibration Data menu.
Main Menu:
SYSTEM
LOG
SETUPS
CAL
DATA
DIAGNOSTICS
From the Calibration Data menu, highlight “CAL FACTOR” and press ENT to display its setup screen. Use the
Left and Right buttons to move the blinking cursor across the screen to highlight the digit to be modified, and
then use the Up and Down buttons to modify that digit. Press ENT to save the new CAL factor value and return
to the Calibration Data menu.
CAL FACTOR 1 .000
FOR R134A
K1=310.89 K2=703.7 K3=1460.3
K4=0.0 K5=0.0
Calibration Data Menu:
CAL TYPE
EXT RATE
EXT GAS TYPE
CAL FACTOR
RESTORE FACTORY CAL
CAL INTERVAL
ENFORCE CAL INTERVAL
LAST CAL DATE