6.5 Safety functions
The Micropilot offers the user the following safety functions:
Example:
Safety functions
# VH Entry Significance
➤ Operating mode
1 V8H3 e.g. 60
H
Delay time E641
2 V8H5 e.g. 1
H
Within safety
distance =
Alarm
Field Parameter Significance
V3H5 Window suppression Defines a distance measured from the datum point in
which no echoes are measured. It is used for suppressing
strong echoes in the immediate vicinity of the antenna,
see Chapter 7.7.
The default setting extends to the tip of the antenna.
A smaller distance cannot be entered.
V8H3 Delay on lost echo If the echo is lost, alarm E641 is output. V8H3 determines
the time which elapses between the loss of the echo and
the response of the Micropilot. Default = 30 s.
V8H5 In safety distance
0: Warning
1: Alarm
2: Alarm, self-holding
3: Reset 2
A safety zone extends 10 cm in front of the window
suppressiion zone. This is to warn, that if the level
continues to rise, the measurement will become invalid. If
product enters the safety zone, the Micropilot responds
according to the setting in V8H5:
0: Warning E643 is output: the device continues to
measure
1: Alarm E643 is output: measurement is suspended until
the product leaves the safety zone.
2: Alarm E643 is output: measurement is suspended until
the alarm is acknowledged.
3: Acknowledges the alarm in case 2..
V8H6 Plausibility
0: off
1: on
The plausibility check is automatically set after the entry of
the application parameter A:
off: application parameters 0 - 3
on: application parameters 4 - 6
When the plausibility check is activated, the current level
is checked against the previous level, in order to establish
whether the value is plausible .If this is not the case, error
code E643 is output and the Micropilot reacts according
to the setting in V8H5 – see also Chapter 7.8.
Chapter 6 Calibration with Display/Remote Operation Micropilot FMR 231
32 Endress+Hauser
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