Siemens 200 External Totalizers and Flow Samplers MR, Relay Contacts, Counter Formula

External Totalizers and Flow Samplers [MR 200]

This feature is only available on the MultiRanger 200.

External totalizers are simple counters which count the number of relay clicks produced by the MultiRanger. This is generally used to keep track of OCM or pumped volume totals. Note that both of these values are also stored in the MultiRanger and are available through communications.

Flow samplers are devices which take a sample of liquid when triggered by a relay click. These samples are used to monitor water quality over time. Flow samplers can be driven by OCM volume or by relay click volume settings depending on the application requirements.

Relay Contacts

Pumped volume is calculated at the end of the pump cycle. Totalized volume given through a relay set up for totalizer (P111[r]=40) will be given in bursts at this time.

Both the open and closed times for the relay contact are provided by P645 and are 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 (m3) of liquid.

P645 P645

4m3 2m3 2m3 3m3 1m3

Pump Cycle

Totalizer

To set the totalizer to provide relay contact to an external counter, use the following:

			Counter Formula
	1 Contact per 10P640 units			P640 is preset to 0 so the default number of
				contacts for a pumped volume cycle is
				equivalent to the number of volume units.
7ML19981FB06		MultiRanger 100/200 – INSTRUCTION MANUAL			Page 71

External Totalizers and Flow Samplers – MR 200