WIKA 851.02.100 - Manual (Page 4)

4 WIKA Operating instructions DELTA-plus, DELTA-comb and DELTA-switch per ATEX
11242370 06/2007 GB/D/F
GB
2. Description and operating principle
The j and i measuring medium chambers are separated by an elastic dia-
phragm. The differential pressure causes an axial movement (measured travel) in
the diaphragm against the measuring range spring. The measured travel is
proportional to the differential pressure and is transmitted, "pressure sealed"
and with minimal friction, via a connecting rod; for:
T
su
to the movement
T st to the movement
and in addition to the plungers
on the microswitches
T sv to the plungers
on the microswitches
For further information on gauge
construction
T su see data sheet
PM 07.15
T st see data sheet
PM 07.16 or PM 07.19
T sv see data sheet
PM 07.17
2122740.01
Illustration for example st
!
Caution
1. Safety instructions
The appropriate national safety regulations (i.e. VDE 0100 /
EN 60 079-14 / EN 837-2) must be observed when installing,
commissioning and operating these instruments.
T Do not work on gauge while under voltage (applies to
Model 702.02/03.100 and 851.02.100)
T Serious injuries and/or damage can occur should the appropriate
regulations not be observed
T Only appropriately qualified personnel should work on these
instruments
T The effective maximum surface temperature does not depend on
these gauges themselves, but mainly on the respective medium
temperature! For maximum permissible medium temperatures,
see the table on page 6.
1. Safety instructions / 2. Description and operating principle