Deadweight Tester / Pressure Balance
GB
LR-
Cal
LDW-H
Operating Instructions
LR-
Cal
LDW-H
18
3.1.3 Connecting the device under test
.
Place the device to be calibrated/verified in the quick connector with the knurled nut. It can be
freely positioned. Hand-tightening will suffice for effective sealing.
To calibrate instruments with rear/back entry connections, use the 90° a
ngle connection
(see
accessories section 8, order-code CPB5000-WA90).
Check the o-ring in the test stand is correctly seated and for any sign of wear.
Replace, if necessary.
Please see to it, that each instrument mounted to the pressure balance must be
clean inside.
The quick connector comes equipped with a G 1/2 threaded insert in the standard delivery
package.
When you are calibrating devices with different connection threads, the threaded
inserts can be changed as appropriate (see accessories "Adapter Set"). For short
connection threads an additional sealing insert (content of the adapter set) can be
mounted onto the existing sealing surface in the knurled nut.
3.1.4 Venting the System
.
After installing the piston-cylinder system and the device under test, air may be trapped in the system.
The system may be vented before beginning the calibration using the following procedure:
The piston-cylinder system and the device under test must be clamped, and the complete weight
set must be loaded on the piston-cylinder system.
Generate a pressure of approximately 50 bar using the priming pump
Increase the pressure with the spindle pump until just below the final value of the measuring range
of the piston-cylinder system, or of the device under test (the smaller pressure range is the decisive
factor).
Important: The piston-cylinder system must remain in its lower position for this
operation, i.e. not yet moving into equilibrium.
Open the outlet valve slowly, any trapped air will escape into the tank
This procedure may need to be repeated 1 to 2 times in order to remove all trapped air.
The device is now ready to use.
O-ring 8 x 2
(see accessories section 8.)
Knurled nut
Threaded insert