WIKA 700.02 - Manual (Page 4)

4 WIKA Operating instructions pressure gauges Model 700.0X with 851 per ATEX
11025867 02/2005 GB/D/F
GB
!
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,
putting into operation and running these instruments.
T Do not work on gauge while under voltage
T Serious injuries and/or damage can occur should the appropriate
regulations not be observed
€ T Only appropriately qualified persons should work on these
instruments
1. Safety instructions / 2. Description and operating principle
2. Description and operating principle
The pressure gauges measure the pressure differential between two connection
points by means of a piston loaded on both sides, which is supported by a
compression spring. Depending on the differential pressure measured the
optional alarm contact switches as soon as the set switch point is reached.
T Pressures p
1
and p
2
are given in the j and i measuring chambers
separated by a magnetic piston under pressure (resp. magnetic piston and
separation diaphragm for model 700.02).
T The difference in pressure causes an axial movement (measuring travel) of
the piston supported by the compression spring.
T The measuring path resulting from this is taken up by a ring magnet found
on the instrument pointer and appropriately displayed. This design combines
the advantage of a complete separation of the measuring system and the
indication and eliminates any leakage to the exterior.
T For model 700.01 the stream of volume from the j measuring chamber to
the i measuring chamber is minimized by the constructive design and will
not interfere with the process.
These measuring instruments are mainly intended for gas / air supply and
preparation applications where no magnetic particles are involved.
In processes with floating particles model 700.02 should be used.
Further information on the gauge design see data sheet PM 07.14