KROHNE MFC 010 C Converter - Manual (Page 73)

MFC010 Interface Manual 71
8. MFC010 Operations
8.1 Mass Flow Zero Calibration
All KROHNE mass flow meters are supplied with an ac curate calibration that is performed at the factory
prior to despatch. However, due to process and i nstallation variations that cannot be ac counted for by
factory calibration, it is always good practice to perform regular zero calibrations on the sensor to ensure
the accuracy of the results. The simple process for performing the zero calibration is laid out below.
The new calibration must be stored in memory (set Output Register 1001) before it will be us ed in the
Mass F low m easurement r esult. T he Z ero c alibration v alue c an be monitored during the calibration
process by reading the “Zero Calibration Percent” Input Register (Input register No. 3047/3048). This will
provide a floating-point value that represents the zero as a percentage of the nominal flow of the sensor.
During calibration the register will return the actively measured zero. When not calibrating, this register
will indicate the stored calibration value.
Zero Calibration
Error? ( Binary
Reg. 1008 = 1)
Error During Calibration
Rectify problem before
re-starting the
calibration (See
Explanations below)
Store Calibration
(Set Output Register 1001)
Zero Cal Percent OK?
(Input Reg. 3047/3048)
Discard Calibration
(Set Output Register 1010)
YES
YES
Calibration In
Progress
Set the Process
Flow to Zero
Initiate Calibration
(Set Output Register 1002)
System State = 3 ?
(Input Reg. 1004)
System State = 6 ?
(Input Reg. 1004)
The System State
(Input Reg 1004)
must be = 3 before
calibration can begin.
NO
YES
YES
NO
NO
NO