Krypton K Multi

Online measuring and control system for free Chlorine, pH-value and Temperature - optionally with ORP measurementOnline measuring and control system for free Chlorine, pH-value and Temperature - optionally with ORP measurement

  • Low maintenance by automatic sensor cleaning ASR
  • Particulary suitable at unsteady pH-values through pH compensation
  • Higher safety by integrated flow monitoring


Ready to use and tested en bloc measuring system for automatic measuring and controlling of free Chlorine, pH-value, and temperature. An ORP measurement can be added - as an option. Chlorine concentration and pH-value can be controlled by separate PI-controllers.


Scope of supply is: measuring and control instrument K 400, free Chlorine sensor, pH sensor, flow assembly GDM with Pt100 (with sampling point, stop cocks for in- and outlet, measuring water filter, flow monitoring and temperature sensor), automatic sensor cleaning ASR for free Chlorine and all necessary cables.


  • free Chlorine pH-value and Temperature for Disinfection Disinfection
  • free Chlorine pH-value and Temperature for Drinking Water & Beverages Drinking Water / Beverages
  • free Chlorine pH-value and Temperature for Cooling And Boiler Feed Water Cooling And Boiler Feed Water


  • 2 separate PI controllers for Chlorine and pH
  • Priority pH controller
  • 2 x 2 limit values with delay
  • Dosage check for Chlorine and pH
  • Semi-automatic two-point-calibration for pH
  • Automatic pH compensation of the Chlorine measurement
  • Automatic or manual Temperature compensation
  • Background illuminated 4 line LC-Display
  • Plain text menu guidance
  • pass word function
  • real time clock
  • Log book function for the last 20 calibration data
  • Broad range power supply 85 .. 265 V AC or DC
  • Serial interface RS 485
  • OPTION: 4 x 0/4 .. 20 mA outputs (scaleable, galvanically isolated)
  • OPTION: additional ORP measurement

technical data

measuring parameter

free Chlorine 0 .. 4 mg/l
pH-value 0 .. 14 pH
Temperature 0 .. 50 °C
ORP -1500 .. +1500 mV

input characteristics

max. pressure max. 6 bar (at 20°C), constant
flow ~30..200 l/h, constant
ambient temperature 0 .. 50°C
pH-range 6 .. 8 pH
min. conductivity >150 µS/cm


output characteristics

output signal optional - 4 x 0/4 .. 20 mA (scaleable, galvanically isolated)
load max. 500 Ohm
registration range free adjustable within the measuring ranges
serial interface RS 485
baud rate 9600
data format 8 bit


power supply

line voltage broad range power supply 85 .. 265 V AC or DC
power consumption 10 VA


ambient conditions

ambient temperature operation 0 .. +50 °C, storage -20 .. + 65°C
exception sensors: 0 .. 30°C
relative humidity max. 90% at 40°C non-condensed
protection class
wall mounted housing IP 65



control response On/off controller (adjustable hysteresis)
P/PI/PID-controller (pulse-pause, pulse-frequency, 3-point controller/ servo motor control (for free Chlorine) or continous controller output)
relays 3 x potential-free NO-contact, max. 250 V, 6 A, 550 VA for activation dosing pumps / Servo-motor
1 x potential-free CO-contact, max. 250 V, 6A, 550 VA for alarm
onset delay 0 .. 2000 sec
digital input 1) Low water
2) Level switch
3) Controller stop via external contact


mechanical construction

material board: PVC, assembly: PMMA, cocks: PP, PVC, instrument: ABS, sensors: glass
dimensions 700 x 395 mm
sampling point Stop Cock R 1/4''
water coupling inlet/outlet: 1/2'' (with stop cock)
tube connection DN 6/8


Krypton K Multi
Krypton K Multi

order information



article number

Krypton K Multi Measuring system for Free Chlorine, pH-value and temperature 70005240K
GDM Redox/ORP add on 1 GDM chamber equipped with ORP sensor and cable 57001520K