Condec DLR3110 - Manual (Page 13)

Operation 9
3. If pressure measurements above and below atmospheric pressure are required, connect a VACUUM
PUMP to the VACUUM/VENT port (2) as shown in Figure 2-1 on page 3.
4. Open the VENT valve (2), close the INPUT valve (1) 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
0 PSIA.
5. With the vacuum pump still running, close the VENT valve (2) and check for system leaks. If there are
none, continue to step 5.1.
a) To apply pressure, close the VENT valve (2) by turning clockwise approximately two turns to its
stop and open the INPUT valve (1) by turning counter-clockwise approximately 1/2 turn until the
numerical display begins to move. In general, the pressure may be changed rapidly until reaching
approximately 90% of it desired final value.
b) Use either the INPUT (1) or VENT valve (2) 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. With a little experience, pressure values very close
to the desired final value may be quickly achieved.
c) To obtain exact pressure readings, slowly rotate the VERNIER control (10) knob in the direction
required (clockwise to increase pressure) as indicated by the electronic numerical display.
Figure 3-1. Pressure Measurement Sequence
DUT
TARE ZERO DISPLAY
YES
ENTER
PRINT
CE
PSI
NO
P Gage Abs
VENT
TEST PORT
MONITOR
PRESSURE LIMIT
VERNIER
CONTROL
INPUT
POWER
DECREASE
INCREASE
7 8 9 4 5 6
1 2 3 10