WQ401 Dissolved Oxygen Sensor

Features
• Fully encapsulated electronics
• 4-20 mA output
• Marine grade cable with strain relief
• Stainless steel housing
• Replaceable DO element

The electronics are completely encapsulated in marine grade epoxy within a stainless steel housing. The sensor uses a removable shield and DO element for easy maintenance.

Dissolved oxygen (DO) refers to the volume of oxygen that the water contains. The quantity of oxygen that the water can hold depends on the temperature, salinity, and pressure of the water. Gas solubility increases with decreasing temperature (colder water holds more oxygen). Gas solubility increases with decreasing salinity (freshwater holds more oxygen than does salt water). Finally, gas solubility decreases as pressure decreases. Thus, the amount of oxygen absorbed in water decreases as altitude increases because of the decrease in relative pressure.

SPECIFICATIONS
Output: 4-20 mA
Range: 0-100% Saturation, 0-8 ppm, temperature compensated to 25c
Accuracy: +/-0.5% of full scale
Operating Voltage: 10-36 VDC
Current Draw: 15.5 mA plus sensor output
Warm Up Time: 10 seconds minimum
Operating Temperature: -40 to +55c
Size of Probe: 1 1/4″ diameter x 11″ long
Weight: 1 lb.
Membrane: 0.001 FEP Teflon

Ordering Information:
WQ401 Dissolved Oxygen Sensor
WQ401-O Online Dissolved Oxygen Sensor Comes with 1” NPT PVC housing.
WQEXC Extra Cable Standard dissolved oxygen sensors include 25′ of cable, but can be purchased with up to 500′ of cable.
00-740 Dissolved Oxygen Sensor Electrode

Dissolved Oxygen electrodes should be replaced every six months and calibration should be done after every replacement.