Pfeiffer Electronic GmbH

Model PGS Series - Pump Control Unit

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The PGS pump control unit is used together with a transducer supplying a standard power signal of 0 or 4 to 20 mA (e.g. immersion transmitter ETG) as a convenient, intelligent and decentralized control system in all drinking water and waste water technology applications that require an exact determination of the level, pressure or the flow quantity, the exact setting of the limited values, simple operation and a high degree of operational safety.

The PGS pump control unit assigns a level with the unit “m water column” to the standard power signal 0/4 … 20 mA supplied by the transducer (in the case of pressure the unit “bar” and in the case of flow quantity the unit “l/s”).

Scaling e.g. for the level, is either via the maximum value from the transducer (ETG) at 20 mA or via the actual value (momentary value). The scaling is defined in steps of tenths or hundredths. The indicator value is calculated according to the input power and the scaling that is set. It is also possible to provide a scaled percentage indicator. The value of the analogue output changes in accordance with this scaling whereby 100% corresponds to 20 mA or 5/10 V at the output.

All the limited values can be determined with the measuring range. For all three limited value pairs the turn-on value can be above or below the turn-off value (fill or empty tanks). Cyclical alternating of two or three limit value contacts balances the load of the connected pumps to ensure uniform wear.

A high degree of operational safety is ensured by the measuring system being continuously supervised. Errors, cable parting or short-circuits, corresponding to the lower deviation from the programmed zero point or the permissible input power being exceeded, are indicated in clear text and also as a potential-free fault. The parameter setting for all functions does not require additional programming equipment and is carried out with 3 keys. For the sake of easy operation it is fully menu guided.

A separate constant voltage supply provides the transducer with the auxiliary power required.

Operating voltage
  • 230 V / 50 Hz or
  • 24 VDC and 24 VAC
Measuring ranges
  • 0... 9.99 (units selectable)
  • 0... 99.9 (units selectable)
Measurement error
  • < +/- 1.5 % F.S.

  • Clear text display
  • Menu guided operation
  • Integrated source of auxiliary power 24 V / 30 mA
  • Analogue input 0/4... 20 mA
  • Analogue output g 0/4... 20 mA oder 0... 5/10 V
  • 4 Relay outputs
  • Continuous supervision of the measuring system
  • Fault indication storage
  • Installation in the front door or on the mounting plate
  • Possibility to simulate analogue output
  • Scaling of the final value
  • Percentage scaling
  • Programmable closing or opening of the contacts
  • Alternating for relay can be selected

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