WQ401 DISSOLVED OXYGEN SENSORS
Dissolved oxygen sensors and dissolved oxygen recorder
- Fully encapsulated electronics
- 4-20 mA output
- Marine grade cable with strain relief
- Stainless steel housing
- Replaceable DO element
Global Water’s dissolved
oxygen sensor is a rugged reliable water oxygen level measuring device. The
dissolved oxygen sensors are attached to 25’ of marine grade cable, with lengths
up to 500’ available upon request. The dissolved oxygen sensor output is 4-20
mA with a three wire configuration. The dissolved oxygen sensor's electronics
are completely encapsulated in marine grade epoxy within a stainless steel
housing (online version has 1” PVC x 8” pipe nipple, threaded both ends with
cap). The dissolved oxygen sensor uses a removable shield and dissolved oxygen
element for easy maintenance.
Global Water's PC300 Dissolved Oxygen Controller to use the dissolved oxygen
sensor's output to control pumps or alarms. In addition Global Water offers
GL500 dissolved oxygen recorder adds recording capabilities to the dissolved
oxygen sensor. The GL500 dissolved oxygen recorder connects to the dissolved
oxygen sensor's 4-20mA output to record data.
Why Measure DO?
Dissolved oxygen (DO) is the amount of oxygen (O2) dissolved in
water. Dissolved oxygen provides one of the best indicators of the health of a
water ecosystem, as oxygen is a necessary element for all forms of life,
including aquatic life. Oxygen enters water at the water surface through direct
exchanges with the atmosphere. It is also produced as a byproduct of plant and
phytoplankton photosynthesis. A decrease in dissolved oxygen levels is
typically associated with an organic pollutant. Dissolved oxygen is used by
plants and animals for respiration, and by aerobic bacteria in the process of
decomposition. When organic matter (such as animal waste or improperly treated
wastewater) enters a body of water, algae growth increases. As the plant
material dies off and decomposes, dissolved oxygen levels decrease. If the
water at the surface is not mixed with deeper water layers, the water’s
dissolved oxygen levels can become stratified. Dissolved oxygen levels can also
vary according to the time of day, weather, and temperature. Dissolved oxygen
in water can range from 0-18 parts per million (ppm), but most natural water
systems require 5-6 ppm to support a diverse population. As dissolved oxygen
levels drop below 5.0 mg/L, aquatic life is put under stress. As dissolved
oxygen levels decrease, pollution-intolerant organisms are replaced by
pollution-tolerant worms and fly larvae. If oxygen levels fall below 1-2 mg/L
for a few hours, large fish kills can result.
Output: 4-20 mA
Range: 0-100% Saturation, 0-8 ppm, temperature compensated to 25°C
Accuracy: ±0.5% of full scale
Maximum Pressure: 40 psi
Operating Voltage: 10-36 VDC
Current Draw: 15.5 mA plus sensor output
Warm Up Time: 10 seconds minimum
Operating Temperature: -40° to +55°C
Membrane: 0.001 FEP Teflon (standard)
Combined Error: 2% FS
Size of Probe:
Standard: 11" L x 1-1/4" Diameter
Online: 12” L x 2” Diameter (end cap)
Weight: Standard and Online 1 lb.
Dissolved Oxygen Sensor Options
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.
Oxygen Sensor Electrode
Dissolved Oxygen electrodes should be replaced every six months and
calibration should be done after every replacement.