HMG 3010
Page 21
Edition 2013-03-26 - V04 R01
Part No.: 669855
The
function
Orifice
measurement
Q=f(dP)
enables you to carry out a flow
rate measurement by measuring the differ-
ential pressure at a flow rate measurement
orifice (e.g. HYDAC EVS 1000).
For both these modes HYDAC HSI pres-
sure transmitters with the same measure-
ment range must be connected to channel
A and channel B. The differential meas-
urement range is produced automatically,
being
±
10% of the measurement range of
the pressure transmitters connected. The
accuracy of the HSI pressure transmitters
is
≤
± 0.5 % FS.
This means that one 100 bar pressure
transmitter might measure 50 bar pressure
as being 49.5 bar, and another might
measure it as 50.5 bar. These pressure
transmitter errors can be compensated for
by recording a correction curve.
After correctly recording a curve, the accu-
racy for differential measurement is
≤
±0.1% of the differential measurement
range.