ULTRA 4 INSTRUCTION MANUAL
156
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:
Remain at its last known value
Will fail to the high value (100% span)
Will fail to the low value (empty)
See Also P218, P228, P238, P248, P258, 268 - 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), P2n8 (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 P2n8. And for
independent mA Output Failsafe see P840.
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