5 On-site calibration without display VU 330
Test pathAn on-site calibration without the operating and display module VU 330 requires a defined
level echo. In order to avoid the danger of acquiring an interference echo from a fitting
as the zero point, it is recommended that the calibration be made outside the tank along
a suitable test path.
•
The length of the test path must correspond to the required empty distance "E".
•
A suitable reflector, e.g. a flat wall, must be available.
•
The Micropilot is pointed at the wall about 1.5 m above the ground.
Calibration and echo
suppression
•
The datum point for the empty distance
"E" and the distance "D" is always the
lower face of the process connection.
# Keys Significance
1 Micropilot ready for operation in test zone
2 Reset
Wait 20 seconds
3 Set empty distance "E".
Wait 2 minutes,
press keys.
4 Set distance "D".
Wait 2 minutes,
press keys.
5 Mount Micropilot on tank
6 Empty tank (at least to "E")
7 Echo suppression.
Wait until green LED stops
flashing.
Result
•
E ≡ 4 mA (= 0%)
•
F ≡ 20 mA (= 100%)
Note!
•
Stilling wells cannot be calibrated using
device keys
+
+
__
D
E
BA171Y02
Step 3
Step 4
D
F
E
100%
20mA
0%
4mA
BA171Y31
Steps 5, 6 and 7
Note!
D
F
E
E
100%
20mA
0%
4mA
Test path free of obstacles and with
reflector, e.g., a wall
stable
seating for
Micropilot
90°
BA171Y34
height above
ground
approx. . 1.5 m
Fig.. 5.1
Calibration outside tank using
device keys
Micropilot FMR 231 Chapter 5 On-site calibration without display VU 330
Endress+Hauser 21
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