H-25C Instruction Manual
Instruction 3015-0216
31
3.2 Manual
Calibration
Use the manual calibration method ff the instrument is not equipped with the auto calibration option.
Manual calibration is possible in both A-type and B-type measurement modes.
Note : An LS - 20B Leak Standard is required for manual calibration.
3.2.1 Setting the Switches
Manual calibration is done in manual calibration mode. Set the " CAL " switch in the setup area to the "
MANUAL " position.
Also set the following three switches to match the type of gas, leak flow, and leak flow units of the LS -
20B to be used for calibration.
•
Set the " GAS " switch to the position for the type of gas.
•
Set the "UNIT" switches for the proper units.
•
Set the "ALARM' switches to the leak flow value.
3.2.2 Operator Actions and Calibration Operation
Start the calibration procedure as follows:
(1) Insert the probe into the H-25C "CAL PORT" to apply an ON signal through the spring switch.
Note : When an S-probe is used, carry out this operation after removing the tube for introducing gas.
(2) After applying the ON signal, immediately pull the probe away from the "CAL PORT" and, with the
instrument in search mode (probe switch not depressed), let the probe suck in clean air. The
instrument will start its calibration operations after about seven seconds.
When it starts the calibration operation, the instrument will output a tone from the
speaker. At this time, you must perform the following actions:
(3) With the probe switch not pressed, touch the probe tip to the LS - 20B PROBE port. Keep the probe
touching until the reading on the display stabilizes.
(4) When the value stabilizes (wait at least ten seconds), press the probe switch once (for less than 0.5
sec.). The instrument will store the calibration data at that time.
(5) Immediately pull out the probe and allow it to suck in clean air.
After completing the calibration operation, the instrument will go into measurement mode. If you changed
any switch settings, return them to their original condition.
3.2.3 What to Do If CAL FAIL Appears
If CAL FAIL appears during calibration, calibration is not performed. When the CAL FAIL indicator
appears, one of the following three fail codes is displayed on the data display area while the instrument
stabilizes.
E - 1 (no sensor sensitivity)
E - 2 (sensor sensitivity too low)
E - 3 (sensor sensitivity too high)
Refer to Subsection 3.1.3 for details of what to do when the fail code appears.
