Water Management Controller PGS 300

July 2011

For level, pressure and quantity evaluation, difference measurement and data logger option

Description

The PGS 300 controller assigns the standard current signal 0 / 4...20 mA supplied by the sensor to a level expressed in the unit mWS (bar for pressure measurements and l/s for flow rate measurements).

Scaling, e.g. of level measurements, is optionally calibrated via the maximum value of the sensor at 20 mA or the actual measured value (instantaneous value).Level scaling is fixed in 1/10, 1/100, or 1/1000 steps. The displayed value is calculated according to the input current and the fixed scaling factor. In addition, it is also possible to scale a percentage display. The value of the analogue output changes in line with this scaling, with 100 % corresponding to 20 mA at the output.

It is possible to determine all limit values via the measurement range. The switch-on value of all three limit value pairs can be above or below the switch-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.

Uninterrupted monitoring of the measurement system facilitates a high level of operational reliability. Fault states – wire breaks or short-circuits – corresponding to falling below the programmed zero point or exceeding the permitted input current are displayed in clear text as well as indicated as a potential-free fault signal. For user convenience it is possible to configure all functions in a menu-assisted environment using just three buttons – eliminating the need for an additional programming device. A separate DC voltage source supplies the requisite auxiliary power supply to the sensor.

Application

    The PGS 300 controller is deployed together with one or two sensors capable of supplying standard 0 or 4-20 mA current signals (e.g. submersible transmitters ETG) as a versatile, intelligent decentralised control solution designed for use in all areas of drinking water and waste water technology – in applications that require water levels, pressure or flow rate to be determined and recorded simply and precisely with high levels of operational reliability.