Product Details

Alpha DO500 ¼ DIN 2-Wire Dissolved Oxygen Transmitter

The Eutech alpha DO 500 1/4-DIN 2-wire dissolved oxygen transmitter features improved circuitry design that prevents ground loop effects and provides high reliability in the measurement of Dissolved Oxygen.
With advanced diagnostic capabilities, excellent flexibility and minimal maintenance, the alpha 500 series transmitters are the perfect instruments to complete your systems in aquaculture, chemical processing or water and wastewater treatment industries.


Product Features


:: Advanced diagnostics like ‘out-of-range’ and ‘hold’ indicators help in monitor and process control. Clear annunciators and easy-to-read dual-line display enables instantaneous view of measured readings and set-up configurations for effortless installation and operation. In addition, scalable 4 to 20 mA current output resolution ensures better resolution at chart recorder or other peripheral devices. Suitable for indoor and outdoor use with its IP65-rated weatherproof housing, the alpha 500 series transmitter can be wall or panel mounted according to industrial requirements.

:: Intuitive push-button user-interface ensures easy calibration and set-up for everyone. The offset adjustment feature enables you to correct readings conveniently without the need to remove the electrode on-site.

:: The alpha 500 series transmitter prevents output interference due to electrical noise or leakage from the input source. Cross-talk between multiple transmitters in a serial loop is eliminated for better accuracy. In addition, operations are not disrupted even if one unit requires maintenance as the transmitters operate on a 12 to 24 V D.C. power supply.




Product Specification


DO Range

mg/l of oxygen: 0.00 – 20.00 mg/l or
0.00 to 19.99 ppm
% saturation of oxygen: 0.0 to 200.0% saturation

Resolution &

0.01 mg/l or 0.01 ppm or 0.1%
1.5% full scale

Temperature Range

0.0 to 100.0 °C

Resolution & Accuracy

0.1 °C / ±0.5 °C

Temp Sensor

Pt100 (2 wire or 3 wire)

Temp. Compensation

Auto / Manual (0 to 50 °C

Temp. Coefficient

0 to 10 °C (Selectable)

Pressure Compensation

0.74 to 3.00 bar; 55 to 225 cmHg; 10.7 to 43.5 PSI (Manual setting and Automatic correction)

Salinity Compensation

0.0 to 50.0 ppt
(Manual setting and automatic correction)


Asymmetrical / Symmetrical

Transmitter Output Range

4.0 to 20.0 mA

Over/ Under Range Current Output

3.8 mA :

ON selects 3.8 mA
OFF selects 4 mA (under range)
selects 20mA (over range)

Hold Current Output

22mA :

ON selects 22 mA
OFF selects last measured current value


Dual Display Custom LCD

Power Requirements

12 to 24 VDC

Load Resistance

Max. 600 W

Ingress Protection

IP65 protection against dust and water jets
(Wall or panel mount)


96 x 96 x 66 mm (3.78 x 3.78 x 2.6 inch)


210 g


Ordering Information


Order No.



Alpha DO 500 2-Wire Transmitter with 4-20mA Output and 12-24 VDC (Unit only)


Download Brochure

Alpha 500 550 560 Series


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