WIKA CPP1600-X - Handbuch (Seite 6)

Comparison Test Pump GB
CPP 3000-X / CPP 5000-X / CPP 7000-X
WIKA Operating Instructions Comparison Test Pump Version 2.1 6
2. Product description .
2.1 General product information .
Application
Test pumps are used to generate pressures for checking, adjusting and calibrating mechanical and
electronic pressure measuring instruments by comparative measurements. These pressure tests may
be carried out in laboratories, workshops or on site at the measuring point.
Functioning
The comparison test pump is equipped with two connections for the test specimen and the reference
instrument which can be used in any order. If the instrument to be tested and a sufficiently accurate
reference measuring instrument are connected to the test pump, the same pressure is applied to the
two measuring instruments when the pump is operated. By comparing the two measured values at
random pressure values, the accuracy can be verified or the instrument under test can be adjusted.
First the pressure is set via an integrated initial pressure pump. For fine adjustment by approaching
the measuring points precisely an adjustable volume with precision spindle is available. Another
important feature of the pumps is the rotating spindle that only runs inside the body of the pump. This
eliminates the negative effect of a bending torque on a spindle turning outside the body and offers the
advantage, especially for use in the field, that the dimensions of these pumps do not change during
operation due to the spindle turning.
The term ”reference instrument” in this manual relates to each kind of pressure
measuring instrument like: spring manometer, electrical pressure measuring
instrument and pressure transmitters with electrical outlet. The comparison test pump
is only as precise as the used reference instrument. The reference instrument should
be recalibrated in regular intervals to guarantee the specifications of the manufacturer.