Product description Design and working principle
EN 3925-0060 V207-00 MANUAL R03.doc 19
HeMaTech
Prüftechnik
Design and working principle
The test device is microprocessor controlled, of modular design and, due to its division
into pneumatic and electronic sections, can be adapted to the most different require-
ments of customers. The design as a 19 inch plug-in unit (3HE) enables problem free
integration into control cabinets. The device dimensions W × H × D are:
− for standard housing 590 × 165 × 456 mm (3 HE without front door)
− for optional version 590 × 300 × 456 mm (6 HE without front door)
Devices with lockable front door have a depth (D) of 496 mm.
Pneumatics
The pneumatic section of the tester consists of the following main components:
− the pressure control for filling and testing pressure via electronic pressure set-
ting (set up specification by computer) with pressure monitoring by means of
an adjustable tolerance window
− a pneumatically controlled isolating valve, which rules out heating of the valve
− a temperature compensating differential pressure measuring transducer for
testing test volumes up to 5000 ml without reference volume
− a high single-side overload protection (max. 150 bar/g) of the differential
pressure measuring transducer
− an optional leakage simulation with precision needle valve
(flow meter to be connected externally)
− pressure sensors for function monitoring of the pneumatic circuit
See also Pneumatic Diagram in the appendix
Electronics
The electronics section of the tester consists of
− microprocessor system,
− battery buffered RAM memory,
− alpha-numerical membrane keyboard for all input functions,
− On/Off switch integrated in the membrane keyboard,
− key switch to protect against unauthorized changing of test parameters and
− graphics display for device menus and up to 2 serial interfaces
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