Freeze And Block Commands; Unlock - Honeywell 854 ATG Series Instruction Manual

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

FR

Freeze

BL

Block

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

W1=

Protection level 1

BM= Block mode

EX

Exit

The 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

UN

Unlock

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Description

The displacer remains in its position even when the level reaches the

displacer position.

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.

Description

Enter protection level 1 password

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.

Exit protection level

Description

The unlock command cancels the operational commands: BL, BT,

CA, FR, GD, GU, LT and TG.

Operation