Siemens SITRANS F M TRANSMAG 2, Руководство по эксплуатации, Страница: 62 / 114

Functions
7.7 Function Group Service
SITRANS F M TRANSMAG 2
60
Operating Instructions, 11/2009, A5E00102775-07
● Start correction, menu item 6.6.2
This automatically determines the hydraulic zero point. This value is visible in menu item
6.6.1 and can be adapted there, if necessary, or undone by entering "0".
Trim param. (menu item 6.7)
You have the following setting options in this menu:
● Calibration factor, menu item 6.7.1
Due to the local hydraulic conditions, any error related to the full scale value is corrected
in this menu item. The value to be set here corresponds to a multiplicator of the
measured value.
An absolutely correctly set zero point is the prerequisite for proper functioning.
● CFH, menu item 6.7.2
This is a factory determined hydraulic calibration value at a flow of 1 m/s. This value is
automatically taken from the SmartPLUG of the measuring sensor. For older measuring
sensors without a SmartPLUG, the value must be transferred manually from the
nameplate.
● CFR, menu item 6.7.2
This is a calibration value for the reference inductor in the measuring sensor calculated in
the factory. This value is automatically adopted by the SmartPLUG.
● ZPH, menu item 6.7.3
This is a factory-determined hydraulic calibration value at a flow of 0 m/s. This value is
automatically taken from the SmartPLUG of the measuring sensor. For older measuring
sensors without a SmartPLUG, the value must be transferred manually from the
nameplate.
● Excitation frequency, menu item 6.7.4
This setting option depends on the type or the nominal width of the sensor or the probes.
Signal Transmitter Sensor Nominal width Magnet frequency
(=mains frequency
911/E Standard
applications
(all) Bipolar prepulse f/5
911/E Rapid
applications
(all) Bipolar f/3
Transmag 2
911/E up to 1995 DN ≤ 150 Unipolar f/6
● Immersion check, menu item 6.7.5
The "Tube empty" detection depends basically on the conductivity of the medium. The
switching threshold is set to a typical value.
Adjustment may be necessary in special cases.
Here you have to determine the current internal measured values for electrodes 1 and 2
for a filled and empty measuring tube under the menu items ’Act.Value El1’ and
’Act.Value El2’. The switching threshold of the immersion check should be set under
menu item ’Threshold’ to about midway between these two values.