Table of Contents
Advertisement
When a valid measurement is made before the timer expires, the AiRanger DPL Plus
advances to the new material level (if changed) as normal (per Measurement Response,
P003) and the timer resets.
If the timer expires (before a valid measurement is made), the AiRanger DPL Plus
advances to the Failsafe Material Level (P071) as restricted by Failsafe Advance (P072).
When a valid measurement is made after the timer expires, the AiRanger DPL Plus
advances to the new material level (if changed), as restricted by Failsafe Advance (P072)
and the timer resets.
If the timer expires due to a measurement difficulty, LOE flashes in the Reading display.
Once activated, the Failsafe State initiates the following:
1.
The material level is reported based on P071 Failsafe Material Level.
•
The unit responds to the new level as programmed (control and alarm relays
activate as defined by the programming).
•
Individual relays can have independent failsafe responses. See P129 Relay
Failsafe.
2.
The appropriate error is displayed:
•
LOE for loss of echo from the transducer
•
Short for a shorted transducer cable
•
Open for a cut transducer cable or a defective transducer
•
Error for all other problems including reversed Ultrasonic/Temperature
transducer terminal connections or wrong Transducer (P004) entered.
When modifying the preset value, set it short enough to protect the process but long
enough to avoid false alarms. Only use No Delay (0.0 Minutes) for testing.
P071 Failsafe Material Level
The material level reported when a Failsafe State is initiated.
Primary Index
Values
Related
Select the Failsafe Material Level based upon the relay operation required during failsafe
operation.
7ML19981BD02
Level Point
Range: -999
to 9999
HI
LO
HOLd
*
•
P001 Operation
•
P006 Empty
•
P007 Span
•
P111 Relay Control Function
•
P112 Relay ON Setpoint
•
P113 relay OFF Setpoint
•
P129 Relay Failsafe
AiRanger DPL Plus – INSTRUCTION MANUAL
Value in units or % (-50% to 150% of span)
Level goes to maximum span
Level goes to 0 span (Empty)
Level remains at last reading
Page 39
Advertisement
Table of Contents
