Bacharach H25-IR Specifications Page 28

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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 “6 Troubleshooting.”
Press ESC as required to return to the Data Display screen.
3.2 Internal Calibration
Internal calibration uses the instrument’s built-in leak source. Properties of the leak source (i.e. gas type, leak
rate, temperature coefficient, and specification temperature) are entered at the factory and do not need to be
changed by the operator.
The properties of the leak source along with the current internal temperature of the instrument are used to
compute the actual leak rate when a calibration is requested. This number is displayed as the “target” value
during calibration. A spring switch located in front of the CAL Port ensures that the probe is kept in place for the
duration of the calibration process. Calibration will fail if the probe is withdrawn too early in the process, or if the
computed parameters deviate from the stored factory calibration by more than 20%.
1. Turn ON instrument and allow it to complete its 120 second warm-up.
CAL TYPE INTERNAL
EXTERNAL
EXT GAS TYPE < R134
A
R401A
R402A
< R402B
EXT RATE 25.5 g/yr
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