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Introduction

Principle & Structure

Membrane dissolved oxygen sensors are polarographic sensors, and the solubility of oxygen in water depends on temperature, pressure and dissolved salts in water. The sensing part of the dissolved oxygen analyzer is composed of gold electrode (cathode), silver electrode (anode) and potassium chloride or potassium hydroxide electrolyte. It adopts titanium alloy outer tube, which has strong corrosion resistance and wide application range; PTFE thick film breathable material and ultra-thick pure silver anode make the life of the electrode longer; at the same time, it adopts replaceable membrane head assembly, which is convenient for daily maintenance. Ensure the accuracy of measurement results.

Features

● The sensor adopts a new type of oxygen-sensitive membrane, with its own NTC temperature compensation function, and the measurement results have good repeatability and stability;

● No oxygen consumption during measurement, no flow rate/agitation requirements;

● Breakthrough fluorescence technology, no membrane and electrolyte, basically no maintenance;

● Built-in self-diagnosis function to ensure accurate data;

● Factory calibration, one year without calibration, can be calibrated on site;

● The distance between the sensor and the transmitter can reach over 100 meters;

● Standard digital signal output, special transmitter-free industrial and mining can realize integration and networking with other equipment;

● Modular installation of sensors to achieve plug and play;

● English and Chinese display can be switched, and it is more convenient to use Chinese.

application

On-line monitoring of DO in various processes such as regulating pools, biochemical pools, and effluent in sewage treatment plants;

DO online monitoring in waterworks, surface water, water in various industrial production processes, aquaculture and other industries.

technical parameter


Dissolved Oxygen Sensor Specifications

Measuring range:Dissolved oxygen: 0-20 mg/L; temperature: 0-60℃
measurement accuracy:Dissolved oxygen: ±3% of the measured value;
Temperature compensation:0-45℃ automatic temperature compensation
NTC22KΩ temperature compensation
Electrode working pressure:0-4 bar
output:'Two isolated 4-20mA
sensor material
body:Titanium alloy outer tube
Response time:Respond to more than 90% of the values ??within 60 seconds
calibration:Air auto calibration, sample calibration
compensate:Automatic temperature compensation, manual salinity, atmospheric pressure compensation
sizeDiameter 13mm*Length 130mm
Minimum flow rate requirement:0.05 m/s
cable lengthStandard 10m cable, extendable to 100m
show:128*64 white backlight black font
AC power supply:AC220V、50HZ
DC power supply:DC24V
Relay:Two-way relay output, program setting response parameters and response values
Relay capacity:AC powered contacts rated for 250 VAC, 5 A maximum resistive
DC powered contacts rated for 30 VDC, 5A maximum resistive
Operating temperature:10...55℃
size:100*100*150mm (L*W*H)
weight:0.58kg
Display accuracy:±0.01 mg/L
Temperature measurement accuracy:±0.5℃
Protocol:MODBUS RS485
output:One isolated 4...20mA output
main material:ABS
storage temperature:15...65℃
Protection class:IP54 (indoor installation or installation in the instrument box)
Installation method:panel installation

Dissolved Oxygen Transmitter Specifications

Selection table

AD31A-Fluorescent Dissolved Oxygen Sensor

Probe Material

SUS316L+PVC

Titanium alloy (suitable for sea water)

Measuring range

0...20 mg/L

0...20 ppm

cable length

Standard matching cable length 10 meters
M stands for meters, followed by items to represent the actual cable length, up to 100 meters.
The above selection table does not contain selection codes. For selection, please contact the sales staff or email to sales@kewill-auto.cn to obtain a complete sample.
AD31B-Dissolved oxygen transmitter controller

Power supply

DC24V

AC220V,50HZ,5W

output signal


Standard: 4...20mA current output + relay Relay output * 2 channels

Optional: 4...20mA+Relay*2ch+MODBUS RS485 communication

Alternatives: Additional Equipment

No additional accessories
Matching ABS material instrument protection box
Matching 1.4301 (304) material instrument protection box (indoor)
Matching 1.4435 (316L) material instrument protection box (outdoor)
The above selection table does not contain selection codes. For selection, please contact the sales staff or email to sales@kewill-auto.cn to obtain a complete sample.

 

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