FLOWCERT LITE (UL) INSTRUCTION MANUAL
110
Failsafe
P808 Failsafe Mode
By default, if a fail-safe condition occurs, then the display, relays and the mA
output are held at their last
known
values until a valid reading is obtained.
If required, then you can change this so that the unit goes to
high
(100% of
span), or
low
(empty) as follows:
OPTION
DESCRIPTION
1 = Known (Default)
Remain at its last
known
value
2 = High
Will fail to the
high
value (100% span)
3 = Low
Will fail to the
low
value (empty)
See Also P218, P228, P238, P248, P258 - Relay Fail-safe and P840 mA Output Fail-safe
P809 Failsafe Time
In the event of a failsafe condition the failsafe timer determines the time
before failsafe mode is activated.
Default = 2mins
If the timer activates, the unit goes into
failsafe
, as determined by
P808
(
Display
),
P218, 228, 238
(
Relays
) and
P840
(
mA Output
). When this
happens, you will see the message “
Failed Safe
!” on the display, along with
a message explaining why (lost echo or transducer fault, for example). When
a valid measurement is obtained then the display, relays and mA output will
be restored, and the timer is reset.
Important Notice
In the event of a fail-safe condition occurring, the display, relays and mA
Output can be configured to fail to a condition which is independent of each
other. To set independent Relay Failsafe see P218, 228, 238, 248, 258. And
for independent mA Output Failsafe see P840.
