H-25C Instruction Manual
Instruction 3015-0216
24
The bar graph indication displays the amount of
leakage. When the probe switch is not being
pressed, the instrument is in search mode and the
indicated value is based on the value of the search
mode alarm point value. The data display area
shows the type of gas selected, and the displayed
value and units. Pressing the probe switch to
place the instrument in pass/bail mode causes the
displayed value to begin flashing.
The above operations complete the calibration gas secondary pressure adjustment. Replace the cover of
the main unit.
When warm up ends, the instrument will go into measurement mode.
Note that calibration gas is always flowing out from the “CAL PORT”. Therefore, once the calibration gas
secondary pressure has been adjusted, that adjustment need not be done again until the calibration gas
(R134a) is exhausted. However, when the instrument not adjusted even temporarily is first adjusted, the
pressure may vary slightly in the initial period. You should check the pressure indication (displayed during
warm-up and during calibration operations) after one day or more has passed and repeat the adjustment if
the pressure is not in the permissible range.
2.7 Calibration
After the instrument has finished warm-up and gone into measurement mode, you can perform a
calibration. However, since it is preferable to wait until the sensor temperature has reached its final value,
and the instrument as a whole is in a thoroughly stable state, we recommend that you wait at least 30
minutes after the end of warm-up before calibrating.
See Chapter 3 for the calibration procedure.
