DO-100 > DO

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Product Introduction

Measurement for Water Treatment


  • Built-in process control program
  • On/off control contact point
  • Users can select Polarographic (2Electrode or 3Electrode) or galvanic sensor
  • Built-in functions of air pressure, salinity, and temperature compensation
  • Built-in data logger (60,000 point), history and graph trend display etc. (Period can be arbitrarily set)
  • Setup Menu designed to adapt to special specifications the user requires
  • Quick and simple auto calibration
  • Backlight graphic LCD displays the measured value and temperature simultaneously
    (Multi-icon, Set Point, Hangul menu status message, current time, etc.)
  • Wide universal power range from 90 ~ 260 VAC
  • Protection levels for the converter: IP66, detector: IP68
  • DC 0/4-20mA or RS-485, RS-232C output for the measured value and temperature
  • Available in a single/multi-nozzle spray cleaning and a continual inspection ultrasonic wave
    cleaning (wash individually or collectively)
  • Cleaning period, Cleaning time, holding time of the electrode can be arbitrarily set
  • Nonvolatile memory saves every parameter and new data even when the power is off
  • Built-in auto temperature compensation
  • Built-in overvoltage protection circuit
  • Built-in self-diagnosis function
  • Built-in self-cleaning function
  • Various furring methods


The product of DO-100 series acutely measures dissolved oxygen.

Depending on the measuring condition, a sensor of DO-100 series either selects 2Electrode or 3Electrode, followed by galvanic or Polarographic methods. The DO-100 series are useful for numerous processes such as sewage treatment, waste water treatment, process management and so on; at the same time, its auto compensation using temperature, air pressure, and salinity measurements minimizes any possible impact caused by changes in the sample.

Menu and operation of DO-100 series are designed to be user-friendly where users can easily correct and measure any samples despite it's the sample versatility; the users can also easily communicate, control, inspect the instrument or save data, using our built-in self-diagnosis, output signal and alarm functions.
Other built-in programs include a current output for controlling purposes, electrode cleaning period program, and especially the cleaning programs offering air/water spray cleaning and ultrasonic cleaning that are adopted for various cleaning conditions.


■ Option

Measuring range DO : 0.00 ~ 20.00mg/ℓ 0.00 ~ 60.00mg/ℓ 0 ~ 1000ppb
Temperature : -40 ~ 100℃
Resolution 0.01 mg/ℓ 1ppb
Accuracy ± 0.5% of F.S.
Reproducibility ± 0.5% of F.S.
Correction method Saturated air or water as correction media
Salinity compensation 0.0 ~ 50 ppt
Atmospheric pressure compensation 555 ~ 808 mmHg
Response time 98% in 60 seconds at 25℃
Temperature compensation 0 ~ 50℃, -5 ~ 110℃
Surrounding temperature -25 ~ 80℃
Sensor (for ATC) Thermistor (22KΩ) /Pt100Ω, Pt1000Ω
Electrode type Polarograph /galvanic
Analogue output Two (2) DC 0/4 ~ 20mA, Isolated
( Reading& Temperature , maximum load 1000Ω)
Digital output RS 485, RS 232C
Control point (On/Off point setting), Temperature point (Heater, Fan), 
Cleaning point
Control point capacity 5A 30VDC / 2A 250VAC
Electrode cleaning Cleaning interval: 0~24 hrs. Cleaning time: 0~10 min.
Output signal holding
Power 90 ~ 260 VAC, 50/60Hz
Power consumption

≤ 30VA

Electric box IP66
Measurement 144 x 144 x137mm

Specification (Electrode)

■ Option

Sensor type LDS-1 LDS-2
Measuring method Polarograph galvanic
Measuring range 0 ~ 20mg/ℓ 0 ~ 60mg/ℓ 0 ~ 1000ppb 0.0 ~ 20.0 mg/ℓ
Temperature range 0 ~ 50℃, 0 ~ 80℃, 0 ~ 130℃ 0 ~ 50℃
Pressure condition 0 ~ 4bar, 0 ~ 10bar, 0 ~ 16bar 0 ~ 4bar
Polarizing time 8 ~ 12 Hr X
Polarizing voltage 674mV X
Digital Output RS485
Response time < 10 sec < 30 sec
Protection degree IP68 IP68

Sensor holder (PH/ORP)

■ Option

Type Submerged-type, Distribution-type, Floating-type
Cleaning device material SUS304, SUS316, PP, PVC, CPVC, Acetal
Holder material SUS304, SUS316, PP,PVC, CPVC
Headquarters(Factory) : Gunwiqongdangil 97, Gunwi-gun, Gyeongsangbuk-doTel : +82-54-383-7181FAX : +82-54-383-7188
Institute of Technology : 42, Palgong-ro 45-gil, Dong-gu, Daegu, Republic of Korea (Esia Polis)Tel : +82-53-383-7181FAX : +82-53-383-7188