
Deadweight Tester / Pressure Balance
GB
LR-
Cal
LDW-H
Operating Instructions
LR-
Cal
LDW-H
30
5.3.3 Venting of the System (after Complete Filling only)
.
After initial filling, or after a complete pressure medium change, air may be trapped in the system. The
system should be vented using the following procedure:
The piston-cylinder system and test specimen connections must be open
Close the outlet valve
Twist out the spindle pump counter-clockwise until it reaches the rear stop.
Carefully operate using the priming pump, while continuously observing the filling medium in the
open piston-cylinder system and test specimen connections. At this point, trapped air escapes
toward the exterior by means of the formation of bubbles. The priming pump must be operated
until air bubbles no longer appear.
Any oil escaping in the open piston-cylinder system and test specimen connections should be
wiped clean before commencing any other operation.
5.4 Recalibration
.
The recommended interval between recalibrations is 5 years depending on the conditions of usage.
This interval assumes the system and weights are handled carefully.
If the system is used in harsh/industrial environments, we recommend shortening the interval to about
three years.
The pressure balance should be immediately maintained and recalibrated, if:
the operating characteristics deteriorate (duration of free rotation, sink rate, sensitivity)
the weight pieces are damaged or corroded
For recalibration or if you have questions about the optimal recalibration cycle, we would be happy to
assist you:
DRUCK & TEMPERATUR Leitenberger GmbH
Bahnhofstr. 33
D-72138 Kirchentellinsfurt / GERMANY
Tel.: +49 (0) 7121-90920-0
Fax: +49 (0) 7121-90920-99
E-Mail: [email protected]