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WH-DO Dissolved Oxygen Meter is an on-line water quality monitor with a microprocessor which widely used in industrial water, domestic water and sewage treatment, and aquaculture.
The oxygen content in the water can be continuously monitored.
It has LCD screen, intelligent menu operation, current or voltage output, measurement range can be set freely, high and low limit alarm, two groups of relay control switches, hysteresis range can be adjusted, automatic or manual temperature compensation, automatic calibration of electrode.
| Measuring Range | 0～100ug/L |
|---|---|
| Measurement error | ± 0.2mg/L FS |
| Automatic temperature compensation | 0～40℃ |
| Response Time | when 25℃ ＜60S; when 35℃ ＜30S |
| Signal output | 4～20mA |
| Two sets of relay control contacts | 3A 240VAC，6A 28VDC or 120VAC |
| Installation method | Panel mount / wall mount |
| Ambient temperature | -10～60℃ |
WH-DO Dissolved Oxygen Meter is an on-line water quality monitor with a microprocessor which widely used in industrial water, domestic water and sewage treatment, and aquaculture.
Use a single -piece micro -processing machine to complete the dissolved oxygen value measurement, temperature measurement and compensation;
The dissolved oxygen value, temperature value and working state are displayed at the same time,the user can follow the prompt on the screen to operate it;
Select 0-10mA or 4-20mA output by software;
Self -set password and service guide:
Users can set or modify the password, so as to avoid the wrong operation of irrelevant personnel; provide technical support and after-sales service for users.
WH-DO Dissolved Oxygen Meter Working principle:
The oxygen electrode uses platinum (Pt) as cathode, Ag/AgCl as anode, 0.1M potassium chloride (KCl) as electrolyte, and a silicone rubber permeable membrane as a gas permeable membrane. During measurement, a polarization voltage of 0.68V is added between the anode and cathode, and oxygen is consumed at the cathode through the permeable membrane. The amount of oxygen that passes through the membrane is proportional to the dissolved oxygen concentration in the water. The limiting diffusion current between the electrodes is proportional to the dissolved oxygen concentration in the water. The instrument detects this current and converts it into oxygen concentration through calculation. At the same time, the thermistor detects the temperature of the solution and performs temperature compensation on the oxygen concentration.
The electrode reaction on the electrode is:
Cathode (Pt) : O2 + 2H2O + 4e = 4OH–
Anode (Ag) : 4Ag + 4Cl– = 4AgCl + 4e
