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Calibration H25-IR
22 Instruction 3015-4342
3.1.2 External Calibration Selection and Setup
When using an external leak source, the instrument must be setup for external calibration along with
entering the leak rate and gas type of the external leak source.
Select external calibration and enter the parameters of the external leak source as follows:
Select External Calibration: From the Calibration Data menu, use the Up and Down buttons to highlight
“CAL TYPE”, and then press ENT to display its setup screen. Use the Up and Down buttons to highlight
“EXTERNAL”, and press ENT to make the selection and return to the Calibration Data menu.
Enter External Leak Rate: From the Calibration Data menu, highlight “EXT RATE” 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 external leak rate value and return to the Calibration Data menu.
IMPORTANT! Be sure to enter the leak rate using the same units of measure as displayed on the EXT
RATE screen. In this example, the units of measure is g/yr. If your leak source is marked in Oz/yr, then
multiply that value by a factor of 28.35. For example: If the leak source is marked 0.9 Oz/yr, then enter a
leak rate of (0.9 x 28.35=) 25.5 g/yr.
NOTE: The minimum calibration leak rate is 2 g/yr.
Enter External Gas Type: From the Calibration Data menu, highlight “EXT GAS TYPE” and press ENT to
display its setup screen. Use the Up and Down buttons to highlight the type of gas contained in the
external leak source. Press ENT to save the new external gas type and return to the Calibration Data
menu.
NOTE: The gases displayed depend on which optical bench is installed. Refer to Section “
7 Specifications.”
Press ESC as required to return to the Data Display screen.
CAL TYPE INTERNAL
EXTERNAL
EXT GAS TYPE < R134
A
R401A
R402A
< R402B
EXT RATE 25.5 g/yr