A5E33329501
SITRANS LUT400 (HART) – OPERATING INSTRUCTIONS
Page 179
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2.11.3.5. Relay Logic
Use to change the behaviour of the relay assigned to external totalizer
control.
Relay contact operation is NORMALLY CLOSED for alarms and NORMALLY
OPEN for controls.
By default a control contact is Normally Open. For
the corresponding relay coil is energized. By setting this parameter to
Normally Closed, the relay coil will be de-energized for the activation
phase.
2.11.4. External Sampler
Available only on LUT430 (Pump and Flow model), and LUT440 (OCM model).
This function uses a relay to signal a flow sampling device when a certain
volume of material has passed through a system (set by the Multiplier), or after
a defined period of time (set by the Interval). The relay toggles on and off at a
rate set by the parameters below. (For details on relay behaviour under fail-safe
conditions, see Miscellaneous relays on page 66.)
2.11.4.1. Enable
Enables/disables flow sampler relay control.
2.11.4.2. Multiplier
Use to scale the external sampler up or down as required.
This allows the sampler relay to click for different values of volume.
Example:
To click once every 4310 flow units, set
to 4310.
2.11.4.3. Interval
The time in hours from the activation of the relay until the next activation.
Set the time to activate the relay during low-flow conditions.
Options
*
NORMALLY OPEN
NORMALLY CLOSED
Note: Default settings in the parameter tables are indicated with an asterisk
(*) unless explicitly stated.
Options
ENABLED
*
DISABLED
Values
Range: 0.0000001 to 99999.000
Default: 1.000
Values
Range: 0.10 to 99999.00
Default: 1.00
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