HYDAC HMG 3010 - Manual (Page 21)

HMG 3010 Page 21
Edition 11/2011 - 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.