WIKA 700.02 - Manual (Page 7)

WIKA operating instructions differential pressure gauge with piston 7
2103869.04 12/2012 GB/D/F/E
GB
3. Specifications
3. Specifications / 4. Design and function
Specifications Model 700.01 Model 700.02
Nominal size 80
Accuracy class ± 3 % of full scale value with
increasing differential pressure
± 5 % of full scale value with
increasing differential pressure
Scale ranges 0 … 400 mbar to 0 … 10 bar 0 … 160 mbar to 0 … 2.5 bar
Max. working
pressure
(static pressure)
optionally 100, 250 or 400 bar 100 bar
(scale ranges 0 ... 160 mbar and
0 ... 250 mbar: 50 bar)
Overpressure safety either side to maximum working pressure
(exception for model 700.02, scale ranges 0 ... 160 mbar and
0 ... 250 mbar: Overpressure safety up to 50 bar)
Ingress protection lP 54 (EN 60529 / lEC 529)
Measuring chamber
with pressure
connection (wetted)
Stainless steel 1.4571, 2 x G ¼ female, on the right and left side,
in-line (EN 837-1 /7.3)
For further specifications see WIKA data sheet PM 07.14 and the order
documentation.
4. Design and function
Description
Pressures p
1
and p
2
are given in the ⊕ and ⊖ measuring chambers, separated
by the magnetic piston under pressure(or magnetic piston and separating
diaphragm for model 700.02).
The difference in pressure causes an axial movement (deflection) of the piston
supported by the compression spring.
The deflection resulting from this is taken up by a ring magnet found on the
instrument pointer and appropriately displayed. This design combines the
advantages of complete separation of the measuring system and the indication
while eliminating any leakage to the exterior.
For model 700.01 the volume flow from the ⊕ measuring chamber to the ⊖
measuring chamber is minimised by the constructive design and will not interfere
with standard processes.
These instruments are mainly intended for gas/air supply and preparation appli-
cations where no magnetic particles are involved.