Operation
P
age 30
4.4 Freeze and block commands
Both the freeze (FR) and block (BL) commands stops the displacer at the current position.
With the freeze command, the displacer remains in its position even when the level reaches the displacer
position. Hence, the level can not be followed and the high and high high level alarms can not be generated.
The block command stops the displacer, and depending on how the block mode (item BM) is set, the
displacer will move up with an increasing level, or the block is cancelled when the level reaches the displacer
position.
Item Name Description
FR Freeze The displacer remains in its position even when the level reaches the
displacer position.
BL Block The displacer stops at its present position, and depending on the
status of item BM, the displacer will move up with an increasing level,
or the block is cancelled when the level reaches the displacer position.
The displacer will remain in its position until an unlock command (UN) is given.
Item BM has to be set (checked) at commissioning (or at a later stage):
Item Name Description
W1= Protection level 1 Enter protection level 1 password
BM= Block mode One character; either C (default) or N.
C : Continuous; when the level reaches the displacer position, the
displacer will follow the increasing level.
N : Non-continuous; the block mode is cancelled when the level
reaches the displacer position.
EX Exit Exit protection level
4.5 Unlock
T
he unlock command (UN) cancels any of the following operational commands:
• Freeze (FR)
• Balance test (BT)
• Go up (GU)
• Go down (GD)
• Block (BL)
• Lock test (LT)
• Calibrate (CA)
• Test gauge (TG)
Item Name Description
UN Unlock The unlock command cancels the operational commands: BL, BT,
CA, FR, GD, GU, LT and TG.
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