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Calibration H25-IR
24 Instruction 3015-4342
3.3 External Calibration
External calibration uses a customer supplied leak source that matches the gas to be monitored.
Properties of the leak source must be entered by the operator using the EXT RATE and EXT GAS TYPE
functions as described in Section
3.1.2 External Calibration Selection and Setup. The EXT RATE entry is
the number displayed as the “target” value during calibration.
IMPORTANT! The operator is responsible for ensuring that the external leak-rate value has been
corrected for daily changes in ambient temperature and pressure at the time of calibration. It is also the
operator’s responsibility to ensure that a good calibration has been performed.
1. Turn ON instrument and allow it to complete its 120 second warm-up.
2. Press the front panel CAL button to display the Calibration screen. Note that the display must be
reading a leak rate of “0.00” when the CAL button is pressed; otherwise, the message “LEAK
RATE MUST BE ZERO TO CALIBRATE” will appear. If necessary, press the ZERO button to
zero the gas display before pressing CAL.
3. Ensure that the instrument is set up for “EXT CAL” (external calibration) as indicated at the
bottom-right of the display. If “INT CAL” (internal calibration) is displayed, perform the procedure
in Section
3.1 Selecting Internal or External Calibration and set the Cal Type to External.
4. Insert probe tip into the Calibration Port of the external leak source.
5. The top number of the Calibration screen shows the “target” value (leak source rate), while the
bottom number shows the current “measured” value. Keep the probe tip inserted in the Calibration
Port for the duration of the calibration process, during which time the instrument performs a
calibration at both a high and low flow rate.
6. After the calibration cycle is complete, the new calibration data is saved and the display
automatically switches back to the Data Display screen. Note, however, if the PCHK Mode is set to
AUTO (refer to Section
2.4.7 PCHK Mode), then a pressure check is performed prior to the display
of the Data Display screen.
NOTE: After calibration the instrument is automatically placed into its Search mode.
Oz/yr
R134A
SETUP
SM SRCH
Oz/yr
R134A
SETUP
EXT CAL
0.00
0.89
TARGET
O/YR
R134A
MEASURED
O/YR
0.89
0.89
Oz/yr
R134A
SETUP
EXT CAL
TARGET
OZ/YR
R134A
MEASURED
OZ/YR