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6. Commissioning
At the first commissioning of the M-Sens 2 FD it is necessary to calibrate the sensor.
Please consider:
•
Correct connection between sensor, C1-box and evaluation unit.
•
Correct installation of the sensor in the process.
In case of negative results in spite of consideration of the points as stated above, please contact SWR.
Commissioning of the M-Sens 2 FD
After the delivery the sensor is
not calibrated to the product(s),
so each calibration and parameterization
has to be executed during the commissioning. Therefore it is necessary to assign the measured moisture to
the desired display and to the initial value. The menu functions are very self-explanatory. In the following a
short introduction to the menu overview:
Menu are accessible via PC software or the touch screen (fieldhousing unit only) – See Operator Interface
Basic function
For the measurement using the sensor, at least 2 measuring points should be
calibrated as a reference point and the corresponding moisture value should
be entered. To do this, the reference point measurement is started in the
calibration. After the measurement, the analysis device expects the input of the
moisture content determined in the lab. While the material is conveyed (in the
loading state), the 2nd point is set to a known moisture value and the calibration
is also carried out. If only one material moisture value is available, then minor
moisture fluctuations and corresponding fluctuations in the moisture values
determined in the lab can be used to save at least 2 calibration points.
Adjustment
For the adjustment of user requirements with regard to material, measuring units etc.
Alarms
The user can select operation modes “None”, “Min”, “Max” or “FLOW” in the
menu Alarms (3.1). A shortfall or exceeding of an adjustable measuring value
can be output via the alarm relay as “open” or “close” (3.5).
The Flow Detection function is available by choosing “FLOW” in the alarm menu.
This alarm will trigger when selected “Noise” value is reached.
In menu Sensor Alarm (3.6), the user can select “OFF” “ERR” or “Proc”. By
choosing “ERR”, alarm will be on in case of sensor error, by selecting “PROC”,
alarm will be on in case of fatal sensor errors/failure and process indicators.
Analog output
is modified in menu 4 and can be adjusted to user requirements here
(e. g. 0… 20 mA). The setting of the minimum and maximum output current can
be setup on 4.1 and 4.2. The alarm value can be defined on 4.3 and alarm type
on 4.4. The exact calibration of the 4 mA and 20 mA value are done via menu
4.5 and 4.6 and 4.7. This operation require the use of a calibrated multimeter.
The measuring range filter makes it possible to adapt to slower recording
devices or continuous output at the analogue output (power output).
Calibration points
The measurement can be checked for linearity based on varying moisture
values. To improve accuracy, these should be determined respectively.
In case of deviations, the non-linearity can be corrected through a table of
support points. Based on the points that are selected and specified in menus
2.4.1 etc. (a minimum of 2 during first commissioning), a correction value can
now be entered for the actual moisture value. (This value can be changed later.)
A maximum of 5 support points are available.
Saving changes
After changes are made, they can be saved using the menu item program
device. The change is carried out once Overwrite calibration is confirmed.
C1-Box
Is only used when the distance between sensor and analysis unit exceeds 2 m.
C3-Box
Is only used when 2 or 3 sensors are connected.
