Condec UPC5010 - Manual (Page 9)

6 UPC5000/UPC5010 Operation & Maintenance Manual
Figure 2-3. Pressure Measurement Sequence (Gage Only)
NOTE : UPC5000 shown, AC Input (7) and Fill Port (4) are on back side of UPC5010 Rack Mountable Calibrator.
2.5 Pressure Measurement Sequence for Absolute Only Unit
1. If only pressure measurements greater than barometric are required, continue to step 1.1. If pressure
measurements above and below atmospheric pressure are required, go to Step 2.
1.1. To apply pressure, close the VENT valve (8) (approximately two turns to its stop) and open the
COARSE ADJUSTMENT valve (2) approximately 1/2 turn counter-clockwise until the numerical
display begins to move. In general, the pressure may be changed rapidly until reaching
approximately 90% of its desired final value.
1.2. Use either the COARSE ADJUSTMENT (2) or VENT valve (8) to obtain a specific pressure reading.
Both provide precise control. As the pressure approaches the desired value, the valve being used for
control should be rotated slowly clockwise to its closed position.
1.3. To obtain exact pressure readings, slowly rotate the VERNIER control (13) knob in the direction
required (clockwise to increase pressure) as indicated by the electronic numerical display.
2. If pressure measurements above and below atmospheric pressure are required, connect a vacuum pump
to the VACUUM/VENT port (15) as shown in Figure 2-4 on page 7.
3. Open the VENT valve (8), close the COARSE ADJUSTMENT valve (2) and apply power to the vacuum
pump and allow it to evacuate the system for several minutes or until the digital display reading reaches
equilibrium near zero PSIA. Press the
ZERO button to establish a zero reference on the display.
4. With the vacuum pump still running, close the VENT valve (8) and check for system leaks. If there are
none, continue to step 4.1.
4.1. To apply pressure, close the VENT valve (8) (approximately two turns to its stop) and open the
COARSE ADJUSTMENT valve (2) (approximately 1/2 turn counter-clockwise until the numerical
display begins to move). In general, the pressure may be changed rapidly until reaching
approximately 90% of its desired final value.