Endress+Hauser FMR 231 - Correction of measuring range; Lock keys

Correction of measuring
range
•
The device must have been calibrated
and the echoes suppressed before the
measuring range can be corrected.
•
The new empty distance "E" may not
exceed that used for the calibration.
Otherwise a new calibration is
necessary, see page 19.
# Keys Significance
1 If appropriate calibration and echo
suppression, p. 19
2 Bring level in tank to "empty",
Wait 2 minutes
3 Empty calibration (4 mA)
= zero
4 Bring level in tank to "full",
Wait 2 minutes
5 Full calibration (20 mA)
= span
After correction of measuring range:
•
"Empty" level E ≡ 4 mA
•
"Full" level F ≡ 20 mA
Lock keys
In order to avoid accidental or
unauthorised changing of the settings, the
keys can be locked for new entries.
# Keys Significance
1 Lock operation:
2 Unlock operation:
After the keys have been locked:
•
All entries, including those via the
operating matrix, are blocked
(VU 330, DXR 275, Commuwin II).
The contents of the matrix fields can be
read, however.
•
Entries can only be unlocked by using
the appropriate key combination, see
above.
Note!
•
After the keys have been used, screw
on the housing cover.
+
+
__
+
+
__
D
F
E
100%
20mA
0%
4mA
BA171Y36
empty distance "E"
of calibration (old)
–
+
–
+
BA171Y35
Note!
Warning!
Chapter 5 On-site calibration without display VU 330 Micropilot FMR 231
22 Endress+Hauser