Siemens SITRANS LUT400 - Relay Contacts; Totalizer

General Operation
7.10 External Totalizers and Flow Samplers
SITRANS LUT400
Operating Instructions, 07/2019, A5E33329501-AC
119
7.10.1 Relay contacts
Pumped volume is calculated at the end of the pump cycle. Totalized volume when External
Totalizer (2.11.3) (Page 215) function is enabled will be given in bursts at the end of the
pump cycle, not throughout the pump cycle.
Use Relay Duration (2.11.3.3.) (Page 216) to set the time in seconds from one change of
state in the relay to the next. This parameter sets both the open and closed times for the
relay contact and is preset to 0.2 seconds. Partial units are added to the next pump cycle.
Example:
Shows a relay set up to make one contact for every cubic metre (m
3
) of liquid.
①
Relay contact open
②
Relay contact closed
③
Relay duration ON time
④
Relay duration OFF time
⑤
Pump cycle
The following parameters describe how to setup a Totalizer or Sampler.
7.10.2 Totalizer
Use the External Totalizer (2.11.3) (Page 215) function to set the totalizer to provide relay
contact to an external counter.
Counter Formula
1 contact every x units, where x = value set in
Multiplier (2.11.3.2.) (Page 215)
Multiplier (2.11.3.2.) (Page 215) is preset to 1 so
the default number of contacts is one contact per
unit of volume.
Example: To click once every 4310 units, set Multiplier (2.11.3.2.) (Page 215) to 4310.
The totalizer source, and units depend on the volume configuration:
Volume Configuration
Totalizer Source
Units Source
Vessel Shape (2.6.1.) (Page 180) =
NONE
Totalizers (2.16.)
(Page 237)
Flowrate Units (2.15.3.7.)
(Page 233)
Vessel Shape (2.6.1.) (Page 180) = any
setting other than NONE
Totalizers (2.7.3.)
(Page 194)
Volume Units (2.6.2.)
(Page 181)