Meter and controller for up to 13 water quality parameters

Meter for pH, redox, chlorine, chlorine dioxide, chlorite, bromine, conductivity, peracetic acid, hydrogen peroxide, ozone, dissolved oxygen and fluoride.


  • Meter and regulator of water parameters in industrial and process water treatment plants.
  • Monitoring of drinking water parameters.
  • Measurement of pH and disinfection parameters in the food and beverage industry.
  • Measurement and control of quality parameters in swimming pool water.
  • Chlorine dioxide concentration monitoring in installations for legionella control and prevention, e.g. in schools, hotels and hospitals.
  • Measurement of disinfection parameters of irrigation water and systems in gardening.

Meter and controller for up to 13 water quality parameters.

DULCOMETER® diaLog DACb is a compact system for water analysis.

In addition to controlling the circuit between the DULCOTEST® sensors and the ProMinent® metering pumps.

Everything you require for the reliable treatment of service and process water in industry, as well as drinking and swimming pool water.


  • Easy to operate thanks to a display that provides very visual information.
  • The instrument includes 2 measuring and control channels in the basic equipment.
  • All parameters to be analyzed can be configured.
  • Remote LAN access via integrated web server for viewing the system at any location.
  • Individual adjustment to different operating states, e.g. day and night operation.
  • Precise monitoring of the adjustment variables to prevent incorrect dosing.

Technical information

  • Measurement of: pH, redox, chlorine, chlorine dioxide, chlorite, bromine, conductivity, peracetic acid, hydrogen peroxide, ozone, dissolved oxygen and fluoride.
  • Installation and protection: Universal housing (wall, pole or junction panel installation) IP 67 and IP 66
  • Control: 2 measuring and control channels, each with one-way PID controller (optionally two-way PID controller)
    24 V DC power supply with very low voltage, e.g. can be used for solar cells or for wet areas in water treatment plants.
  • Temperature compensation for pH and chlorine dioxide process sensor CDP, pH compensation for chlorine.
  • Digital inputs for control signal processing, e.g. limit switches for water metering, remote shutdown control and for monitoring fill levels in chemical tanks.
  • Actuator outputs: for electronic metering pumps and solenoid valves.
  • Disturbance variable processing: simple regulation of water parameters in the water flow by flow processing in the regulation algorithm.
  • Adapts the controller setpoint to process conditions by means of a mA signal from a PLC or, with higher demands, by means of the fieldbus option.

Available Panels:

Includes controllers, cables, sensors, sensor holders and fastening panel.

Manufacturer’s code
Measurement and Control Panel DACb Chlorine + pH

Technical Data

Measuring quantities and measuring ranges
Tipo de conexión mV:

Connection type mV:

pH: 0.00 to 14.00

Redox voltage: -1500 to +1500 mV

Connection type mA (amperometric measurands, measuring ranges depending on the sensors):


Chlorine dioxide




Hydrogen peroxide (PER sensor)

Hydrogen peroxide (PEROX sensor PEROX converter PEROX V2 ref. no. 1047979)

Peracetic acid

Dissolved oxygen

Connection type mA (potentiometric measurands, measuring ranges depending on the transmitters):


Redox voltage


via VA module and function expansion packages 3 and 4

Conductivity mA via CCT sensor 1-mA-20 mS/cm

Temperature: via Pt 100/Pt 1000, measuring range by means of Pt 100/Pt 1000, measuring range 0 to 150° C

pH: 0.01

Redox voltage: 1 mV

Temperature: 0.1° C

Amperometry (chlorine, etc.) 0.001/0.01 ppm, 0.01% vol., 0.1% vol.

0.3 % referred to the final value of the measuring range
Measurement input
pH/Redox (input resistance > 0.5 x 10¹² Ω)
Compensación de temperatura
Pt 100/Pt 1000 para pH, sensor de dióxido de cloro (CDP) y fluoruro
Temp. correction area
0 a 100 °C
pH correction range for chlorine
CLE 3 and CLE 3.1 sensors: 6.5 to 8.5, CBR sensor: 6.5 to 9.5
Disturbance variable
Flow rate via 0/4 … 20 mA signal or contact hydrometer, 1 – 500 Hz. The multiplicative disturbance variable can affect all channels, the additive disturbance variable only one.
Regulatory  Behavior
P/PID regulation
2 o 3 sense regulators
Analog Outputs
2 (3) x 0/4 to 20 mA galvanically isolated, capacitive load max. 450 Ω, adjustable range and assignment (measurands, correction and adjustment variable)
Adjustable Outputs
2 (4) pulse frequency outputs for controlling metering pumps

2 relays (limit value or pulse length regulation)

Alarm Relay
250 V ~3 A, 700 VA, changeover contact type
Digital control Inputs
4 (7) as remote inputs for pause functions, measuring water regulation/error, parameter set switching, chemical tank level monitoring.
Electrical connection
100 – 230 V, 50/60 Hz, 25 VA, optionally 24 V DC
Fieldbus connection
Ambient Temperature
0 to 50 °C (for indoor installation or with protective housing)
Protection Type
Wall mounting: IP 66 and IP 67 (NEMA 4X)

Switchgear cabinet mounting: Switchgear cabinet with IP 54 protection

Certificates and approvals
CE and MET (corresponding to UL according to IEC 61010)
Housing material
PC with flame retardant protection
250 x 220 x 122 mm (W x H x D)
1.3 kg

Basic Equipment

  • PID controller with pulse-frequency metering pump control for 2 metering pumps.
  • 2 analog outputs for measured value, correction value or adjustment variable (depending on optional equipment).
  • 4 digital inputs for metering water metering error detection, level switch, pause and parameter switching.
  • 2 power relays programmable as limit value output, cycle timer, real-time timer or as discontinuous adjustable output (depending on optional equipment).
  • Selection of analysis parameters and language during commissioning.
    Temperature compensation of pH, chlorine dioxide (CDP) and fluoride measurement via Pt100/Pt1000.
  • 24 operating languages: all European languages plus Chinese, Russian, Thai and Korean. The operating language is selected during commissioning and can be changed at any time using a key combination. The documentation language is selected by means of the identification code. In addition, a data carrier containing all other languages is supplied.
  • Storage and transmission of device parameters via SD card.
  • Calibration and event recorder (without SD card, data is stored in the controller).
  • Processing of disturbance variables (flow rate) by frequency (contact hydrometer).
    Possibility of software function expansion by activation key or firmware update.

Description of possible measurement quantities as basic measurement quantities:

VA module mV/temperature + mA sensor input:

  • 1 sensor input for pH or redox sensor and temperature sensor Pt100/Pt1000
  • 1 sensor input for connection of chlorine sensors such as CBR or pH converter pHV1 and fluoride, including disturbance variable or pH compensation for chlorine.

AA module mA/mA sensor input:

  • 2 sensor inputs for connecting chlorine sensors such as CBR, or the pH converter pHV1, including disturbance variable or pH compensation for chlorine.

VV module mV/mV temperature sensor input:

  • 2 sensor inputs for connection of pH and redox sensors and temperature sensors Pt100/Pt1000, e.g. types PHER, RHER, PHEI, RHEIC, Pt100SE

L3 module conductivity sensor input temperature:

  • 2 sensor inputs for connection of conductive conductivity sensors and temperature sensors Pt100/Pt1000, e.g. types LFT, LMP

Optional equipment for third pH measurement channel

Package #2

  • pH control up to 3 orders of magnitude in mV or mA, with or without pH compensation for chlorine, no external setpoint via analog signal for channel 1, no flow disturbance variable via channel 1
  • Third analog output.
  • Control of two further metering pumps.

Package #3

  • Third complete measuring and control channel, measuring variable as desired, with PID controller.
  • Third analog output for measured value, correction value or adjustment variable (depending on optional equipment).
  • Three additional digital inputs, e.g. for level control, pause and measuring water alarm of channel 2.
  • Temperature compensation of pH, chlorine dioxide (CDP) and fluoride measurement.

Package #4

  • Combination of packages 2 and 3 (single channel available for amperometric sensors for mA disturbance variable processing).

Communication options

  • Measurement data logger with SD card.
  • Visualization of measurement data via web server via LAN, PC/tablet and web browser.
  • PROFIBUS®-DP, Profinet and Modbus RTU.

Hardware extension

  • RC protection circuit for power relay: Protects the power relay when inductive loads (e.g. solenoid valves or motors) are to be energized. Not available for 24 V DC supply.

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