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H25-IR Maintenance
Instruction 3015-4342 41
5.2.6 Leak TEMPCO
The Leak Temperature Coefficient value is set to match the temperature coefficient of the internal leak
source as indicated on the tag attached to the leak source. 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 Leak Temperature Coefficient value.
TIP: To convert a temperature coefficient from %/degF to % degC, multiply the
degF value by a factor of 1.8. For example: 0.3%/degF x 1.8 = 0.54%/degC.
5.2.7 Sensor Cal
The Sensor Calibration function allows the service technician to manually calibrate the instrument’s
Pressure, Flow Rate, and Box Temperature sensors. Use the Up and Down buttons to highlight the
sensor to be calibrated, and then press ENT to display that sensor’s calibration screen.
5.2.7.1 Pressure Sensor Calibration Screen
Calibrate the pressure sensor by first measuring the ambient atmospheric pressure using an appropriate
pressure measurement device calibrated to read PSIA. Next, adjust the value displayed on the Pressure
Sensor Calibration screen to match the measured pressure reading by using the Left and Right buttons
to move the blinking cursor across the screen to highlight the digit to be modified, and then using the Up
and Down buttons to modify that digit. Press ENT to save the new ambient pressure value.
Tip: To convert inHg into PSIA, multiply inHg by 0.491. For example: 30.00 inHg x 0.491 = 14.73 PSIA.
5.2.7.2 Flow Rate Sensor Calibration Screen (Factory Calibration)
Set the default factory calibration flow and pressure drop values by first performing an internal
calibration as described in Section
3.2 Internal Calibration.
INT: Flow rate in moles/minute for both the Search and Measure modes after performing a calibration
using the internal leak source, along with showing the manifold’s pressure drop.
FAC: Flow rate and pressure drop values that are currently stored as the default factory calibration
values. These values are used to validate calibrations performed by the operator. A calibration error will
occur if the operator’s calibration and factory values differ by more than 20%.
Press ENT to store the internal calibration numbers as factory values. These are the calibration values
that are reset when RESTORE FACTORY CAL is selected from the CAL Data menu (refer to Section
3.5
Restoring Factory Calibration).
LEAK TEMPCO 0.54
%/degC
PRESSURE
FLOW RATE
BOX TEMP
ENTER AMBIENT PSIA
14.18
CURRENT OFFSET=0.00
S-Mpm/dP M-Mpm/dP
INT 0.0177/-1.33 0.0100/-2.28
FAC 0.0177/-1.33 0.0100/-2.28
ENTER TO SAVE INT AS FACTORY