Proline Fieldcheck
Device functions - electromagnetic measuring systems
Hauser
53
10.1.2
Group VERIFICATION TRANSMITTER
In the VERIFICATION TRANSMITTER group, a measuring device can be checked for the following
characteristic values:
• Functionality and deviation in the flow measurement (based on the set point preset by Fieldcheck)
• Functionality and deviation of the current and frequency outputs if these outputs are available in
the measuring device. The specified set points correspond in the gradation to the measuring points
when determining flow.
Data bus outputs such as PROFIBUS or FOUNDATION FIELDBUS cannot be directly checked by
Fieldcheck.
• Static and dynamic characteristic values of the magnetic field and electrodes.
Verification of transmitter
Checking the linearity of the amplifier:
Simulated flow at four measuring points which are determined via the 100% full scale value (can be
selected for a presumed fluid velocity between 1 m/s and 8 m/s).
Checking a current output:
Each current output can be verified in the configuration in the measuring device (CURRENT
RANGE function (0-20 mA, 4-20 mA)) in the same gradation (5% to 100%) as the amplifier. For
this purpose, the current output must be directly connected to the current input of Fieldcheck. If
more than one current output is available, verification takes place in several, menu-guided steps.
!
Note!
If the current output of the measuring device is configured as passive, this output can only be
verified if the software version of the amplifier is 1.06.xx or higher. (Does not apply to Promag
10-type amplifiers.)
Checking a frequency output
(FREQUENCY operating mode):
Each frequency output can be verified in the configuration in the measuring device (START VALUE
FREQUENCY, END VALUE FREQUENCY, OUTPUT SIGNAL functions) in the same gradation (5%
to 100%) as the amplifier. For this purpose, the frequency output must be directly connected to the
frequency input of Fieldcheck. If more than one frequency output is available, verification takes
place in several, menu-guided steps.
!
Note!
A frequency output cannot be checked on Promag 10-type devices in the FREQUENCY operating
mode.
Checking a frequency output
(PULSE operating mode):
Each pulse output available can be verified in the configuration in the measuring device (PULSE
WIDTH, OUTPUT SIGNAL functions).
Sensor test
Coil current test:
For testing the sensor (for the electromagnetic measuring principle) the rise time of the coil current
and further magnetic field-relevant characteristic variables are determined and compared with the
corresponding set points. If the limit values are exceeded, a FAILED message is displayed in the
results.
"
Caution!
Electrode integrity test
(not for Promag 10 and Promag 55-type devices):
When testing the sensor, the electrode integrity test is carried out at the end of the verification. For
this purpose, the measuring tube must be filled and the sensor signal cable must be plugged into the
measuring amplifier socket. A corresponding message appears on the display and you are given the
option to CONTINUE or CANCEL.
