GE Druck DPI 610, User Manual

Page: 82 / 90

K415 Issue No. 1 72
Method of Testing with Low Volume Systems (
continued
)

Turn the volume adjuster coarse control clockwise (counter-clockwise for
vacuum) to set-up the required test pressure. Use the volume adjuster fine
control to adjust the test pressure of the calibrator to exactly the required value.

Use the TASK key to set-up the calibrator for an appropriate test:
Example:
P-DISPLAY

To record test data for other tasks, set-up the calibrator to either Data log or
Snapshot as required (refer to pages 30 or 31). If required, and for DPI 615
calibrators only, switch on Cal Mode (refer to pages 11, 34 and 35).

Turn the volume adjuster clockwise to set-up any additional test pressures
required. The recommended method starts at 0, increasing to 10%, 25%, 50%,
75% and 100% full-scale and then decreasing to 75%, 50%, 25%, 10% and 0.
Note: To release the output pressure at any point during a test or series of tests,
open the vent valve. Allow sufficient time for the connected system to vent
(very important when connected to larger system volumes, >0.25 litres [15
cubic inches]).
Preparation for Use with Larger Volume Systems

Set-up the calibrator to record the test data, using either Data log or Snapshot
facilities refer to pages 30 or 31. If required, and for DPI 615 calibrators only,
switch on Cal Mode (refer to pages 11, 34 and 35).

Fit the appropriate pressure fitting to both the positive (+) and negative (-) ports
using a bonded seal as shown in Figure B3. Make sure that both pressure fittings
are tight.

Turn the volume adjuster (counter-clockwise) to approximately half-way
(approximately 30mm (1”) of thread showing).

Make sure that the vent valve is open (fully counter-clockwise).

Connect the hand-pump and tee-piece as shown in Figure B3. Connect the
device or system under test to both the reference (-) and the pressure port (+) as
shown. Connect the ribbed arm of the double tubing to the high (+) pressure input
of the device under test.
Note: To minimize temperature effects, always use double tubing, separating the
arms of the tubing only by the minimum amount necessary to make the
pressure connections. See Figure B3.