ProMinent GmbH

- Compact Water Analysis Controller


As a controller in water analysis, the DULCOMETER Compact is the correct controller for control tasks that require only a 1 way control.

Compact yet fully equipped - the basic water analysis unit.

The DULCOMETER Compact controller is a one-channel PID controller for the measured variables pH, ORP, chlorine and inductive conductivity. It can monodirectionally control the measured variable, monitor limit values and transmit the measured value via an mA output, e.g. to a PLC. The mA output can optionally also be configured as a controlled variable output. The controller has one pulse frequency output to control one metering pump. One output relay can optionally be used as an alarm or limit value or to control motor-driven metering pumps or solenoid valves. A digital input is used to switch off the control or to process a sample water limit contact by remote control. The impact of temperature on the measurements can be provided by temperature measurement or by manual input. Menu-driven operation is language-independent.

  • Flexibility in the choice of measured variable with pH and ORP
  • Always the optimum measured value resolution by auto-ranging with conductivity measurement
  • Depending on the requirement, various display options for conductivity, such as: Conductivity, TDS (Total Dissolved Solids), salinity and specific resistance
  • Safety through sensor monitoring of pH for glass breakage and line breakage
  • Various installation options: wall-mounted, installation on an upright or in a control cabinet

Technical Details

  • Measured variables: pH, ORP, chlorine, conductive and inductive conductivity
  • Method of installation, degree of protection: Combination housing (wall mounting, control panel mounting, pillar assembly) IP 67, control panel IP 54
  • Measurement: 1 measuring channel, temperature compensation for conductivity and pH
  • Control: PID controller, monodirectional controller (e.g. with pH acid or alkali)
  • Control inputs: 1 digital control input

Technical Data

  • Measuring range:
    • pH: 0.00 ... 14
    • ORP: -1000 ... +1000 mV
    • Chlorine: 0.05 ... 5 ppm, intermittent metering up to 10 ppm, max. 12 h
    • Conductive conductivity: 0.5 µS/cm ... 20 mS/cm (auto-ranging)
    • Inductive conductivity with ICT 1: 200 µS/cm ... 1000 mS/cm (auto-ranging)
    • Inductive conductivity with ICT 2: 20 µS/cm ... 2000 mS/cm (auto-ranging)
  • Resolution:
    • pH: 0.01 pH
    • ORP: 1 mV
    • Chlorine: 0.01 ppm
    • Conductivity: 0.1 µS/cm (depends on the measuring range)
  • Accuracy: 0.5% of the upper range value
  • Temperature compensation range: 0 ... 120 °C, chlorine 1 ... 45 °C
  • Control: Monodirectional PID control with selectable control direction
  • Inputs:
    • Sensor input for the relevant measured variable
    • Temperature sensor input: pH: Pt 1000, chlorine and conductivity: Pt 100/ Pt 1000
    • 1 digital input as a remote control input for the functions pause control / sample water fault
  • Outputs:
    • 1 pulse frequency output for the control of metering pumps
    • 1 active 0/4…20 mA output configurable as a measured or control variable, max. load: 400 Ω
    • 1 output relay used as a changeover contact, can be configured as an alarm, limit value or pulse width-modulated control output for motor-driven metering pumps
  • Cell constant, conductive conductivity: 0.05 ... 12.0 cm-1
  • Voltage supply: 100-240 V ±10%, 50/60 Hz, 5 W
  • Permissible operating temperature: -10 ... +60 °C
  • Enclosure rating: IP 67, based on NEMA4X
  • Dimensions: 135 x 125 x 75 mm (H x W x D)
  • Weight: 0.5 kg

  • Measurement and control of water parameters in industrial and process water treatment plants
  • Permeate monitoring in reverse osmosis systems
  • Measurement and control of the hygiene parameters in swimming pools