Introduction - GE Druck DPI 610 User Manual

Low Pressure Calibrator Versions
Introduction (Figure B1)
These versions of the DPI 610 and DPI 615 Calibrator measure and display low
differential pneumatic pressures applied to the pressure port. The differential pressure
measurement ranges can be: 2.5, 12.5, 25, 50, 75 or 150 mbar (1.0, 5.0, 10.0, 20.0, 30.0
and 60.0 inH O).
2
For low volume external systems or devices, test pressures are generated by an integral
two-stage (coarse/fine) volume adjuster. For larger volume external systems or devices,
test pressures are generated by an external, hand-operated, pneumatic pump.
An internal pressure limiter operates at 120% of the full-scale, positive or negative test
pressure. If this over-pressure remains for more than approximately 1 second, a valve
within the calibrator opens, directly connecting the positive and negative pressure ports
together, to release the excess pressure. When the pressure decreases to within the
operational limits, the valve automatically closes to allow normal operation to restart.
This section should be read in conjunction with the operation and calibration sections of
this manual. All the operational features described for the standard calibrator are
available on this low pressure version of the calibrator.
6
5
4
1 Control panel
4 Volume adjuster (fine)
1
2 Vent valve
5 Volume adjuster (coarse)
Figure B1 - Calibrator Controls
69
3
3 Positive pressure output port
6 Reference port
K415 Issue No. 1
2