Page 96 SITRANS LUT400 (HART) – OPERATING INSTRUCTIONS A5E33329501
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General Operation
Flow Sampler
Use the
2.11.4. External Sampler
function to activate the flow sampler relay based on
volume and time.
The totalizer source, and units depend on the volume configuration:
By using
2.11.4.2. Multiplier
, the relay contacts can be based on a volume other than a
multiple of ten.
During the periods of low flow, the sampler may be idle for lengths of time. Program
2.11.4.3. Interval
time in hours to drive the sampler. The sampler will operate based on the
volume of flow or the time interval, whichever comes first.
Counter Formula
1 contact every x units, where
x
= value set in
2.11.4.2. Multiplier
Example:
To click once every 4310 units, set
2.11.4.2. Multiplier
to 4310.
2.11.4.2. Multiplier
is preset to 1 so
the default number of contacts for
a pumped volume cycle is one
contact per unit of volume.
Volume Configuration Totalizer Source
Units
Source
2.6.1. Vessel Shape
= NONE
2.16. Totalizers
(OCM
flow totalizer)
2.15.3.7. Flowrate Units
2.6.1. Vessel Shape
= any setting
other than NONE
2.7.3. Totalizers
(pumped
volume totalizer)
2.6.2. Volume Units
Parameter
Sample
Value
Description
2.11.4.1. Enable
Enabled Enables Flow Sampler Relay
2.11.4.2. Multiplier
4310 Click once every 4310 units
2.11.4.3. Interval
2
Sets the INTERVAL (in hours) of the relay
contact, usually long.
2.11.4.4. Relay Duration
0.2
Sets the DURATION (in seconds) of the
relay contact, usually short.
2.11.4.5. Assigned Relay
Relay 1
Sets relay 1 to be controlled by flow
sampler
2.11.4.6. Relay Logic
Normally
Closed
Use (if necessary) to change the
behaviour of the relay assigned to the
sampler.
Default: Normally Open
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