Huba Control 713 Operating Instructions Manual page 7

Calculation of level
General level with relative pressure sensor:
General level with absolute pressure sensor:
which
und
Using a second level sensor as barometric air pressure sensor
For level sensor with current output use nominal signal values for I
variables U ... (resp. I
TS
Simplification of formula for level sensor with ratiometric output:
Using a second level sensor as barometric air pressure sensor
Legend:
h level [m]
g acceleration of fall 9.80665 [m/s
P measured pressure of level sensor [Pa]
TS
P measured pressure of barometer [Pa]
BARO
P minimal nominal pressure of level sensor [Pa] U
TS_NP
P maximum nominal pressure of level sensor [Pa] U
TS_EW
P minimal nominal pressure of barometer [Pa]
BARO_NP
P maximum nominal pressure of barometer[Pa] U
BARO_EW
Technische Änderungen vorbehalten | Technical data subject to change | Sous réserve de modifications techniques
Huba Control AG - Industriestrasse 17, CH-5436 Würenlos - Edition 08/2017 - 120311
... instead of U
Baro
2 ]
...)
Baro
ρ
density of media [kg/m
∆p
measured relative pressure [Pa]
U signal on level sensor output [V or mA]
TS
U Signal on barometer output [V or mA]
BARO
minimal nominal signal of level sensor [V or mA]
TS_NP
maximum nominal signal of level sensor [V or mA]
TS_EW
U minimal nominal signal of barometer [V oder mA]
BARO_NP
maximum nominal signal of barometer [V or mA]
BARO_EW
... instead of
TS
3 ]
7