Bacharach H-25C, Инструкция

Страница: 23 / 59

H-25C Instruction Manual
Instruction 3015-0216
23
2.6 Calibration Gas Secondary Pressure Adjustment
Note: This adjustment is required in the instrument equipped with the auto calibration function.
The calibration gas secondary pressure adjustment is done during the approximately three minutes of the
warm-up period when the pressure is indicated on the bar graph.
In principle, the H-25C is shipped with the calibration gas secondary pressure temporarily adjusted. This
section shows, however, the adjustment should be made with the tank valve closed. If it has been
temporarily adjusted, make the re-adjustment according to step (3) of the following adjustment procedure
give below.
(1) First, make absolutely sure that the regulator valve is completely closed.
Note: If the regulator valve is open at the time that you open the valve on the calibration gas tank, a
pressure of nearly 600KPa (6kgf/cm
2
) may be imposed on the calibration gas tubing system. Even though
the tubing system will not be immediately damaged even if subjected to this pressure, you should make
every effort to avoid this.
(2) Always pull up on the regulator knob when turning it.
Fully open the valve on the tank. Turn the handle on top ¾ of a turn counterclockwise until you feel it
hit a stop, at which point the valve is fully open.
(3) Slowly turn the knob on the regulator valve to open it so as to bring the bar graph indication near the
150% point (147kPa {1.5kgf/cm
2
}).
If you turn the knob too far (raise the pressure too high), loosen the gas bleed plug and wait for the
pressure to drop to a value below the target, then tighten the gas bleed plug and repeat the adjustment
Note: Loosening the gas bleed plug will result in the outflow of much more gas than the amount that
flows out from the “CAL PORT”.