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Installation types for absolute pressure measurements (closed containers)
S
DEV
+
Installation type C
1
Start of scale value:
p
LRV
= p
start
+ ρ
oil
* g * H
1
Full-scale value:
p
URV
= p
end
+ ρ
oil
* g * H
1
S
DEV
+
Installation type C
2
Start of scale value:
p
LRV
= p
start
+ ρ
oil
* g * H
1
Full-scale value:
p
URV
= p
end
+ ρ
oil
* g * H
1
Always install pressure transmitter for absolute pressure below the measuring point: H
1
≥
200 mm (7.9 inch)
Key
p
LRV
Start of scale value
p
URV
Full-scale value
p
start
Initial pressure in the container
p
end
Final pressure in the container
ρ
oil
Density of the filling oil in the capillary line of the remote seal
g
Acceleration due to gravity
H
1
Distance container flange to pressure transmitter
Note
Effects of temperature
Keep the following instructions in mind to minimize the effects of temperature in remote seal
measuring systems with differential pressure transmitter:
Install the device so that the positive and negative sides are symmetrical as far as ambient
effects and the ambient temperature are concerned.
Installing/mounting
5.4 Installation with remote seal
SITRANS P320/P420 with 4 to 20 mA/HART
58
Operating Instructions, 11/2019, A5E44852162-AC