Martel Electronics DPC300A - Manual (Page 17)

15
3. Set the pressure/vacuum selection knob to the desired function
(+ for pressure and - for vacuum).
4. Close the vent knob.
5. Press the pump key and monitor the pressure rise (or vacuum
generation) until you reach the desired pressure.
Note: The motor speed will start slowly while the pressure is
low (< 1 bar) to enable better control at low pressures.
6. The fine pressure adjustment enables the pressure to be set
precisely.
7. To reduce or bleed off the pressure entirely slowly rotate the vent
knob to the open position. The pressure reduction is best
controlled if this step is carried out carefully and it makes reading
the pressure easier.
4. Measuring pressure
For pressure calibration, connect the calibrator with an appropriate
adapter. Select the pressure setting for the display being used. The
calibrator is equipped with an internal sensor and optional external
sensors are available. Choose a sensor that is suitable for the
pressure range and accuracy.
CAUTION!
Pressure sensors may be damaged and/or injuries may occur to the
personnel due to improper application of pressure. For a better
understanding with respect to overpressure and burst pressure,
follow the specifications laid down in these operating instructions
(see chapter "3. Specifications"). The calibrator display will indicate
"OL" when an inappropriate pressure is applied. As soon as "OL" is
observed on any pressure display, the pressure should be reduced
immediately to prevent damage or possible physical injury. "OL" is
displayed if the pressure exceeds the nominal range by 110 %. Use
the ZERO key to zero the pressure sensor once it is vented to
atmospheric pressure.
4.1 Media compatibility
CAUTION!
The calibrator should only be used with clean, dry gases! To prevent
contamination by the test pieces, the use of a dirt trap is
recommended (see chapter "10. Accessories")!
15