8
11025859.03 10/2013 GB/D/F/E
GB
WIKA operating instructions differential pressure gauge with piston per ATEX
3. Specifications
3. Specifications / 4. Design and function
Specifications
Model 700.01
Model 700.02
Nominal size
80
Indication accuracy
±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
measuring range 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
applications where no
magnetic particles
are involved.
