|
|
| WQ-FDO OPTICAL DISSOLVED OXYGEN TRANSMITTER |
|
Optical dissolved oxygen sensor
|
|
FEATURES:
- Extremely fast and precise optical DO sensor – outstanding for field and lab applications
- Proven green light technology for long operation life of sensor
- Beveled membrane minimizes interference that can be caused by air bubbles
- Universal protective armoring available
- Low power consumption and maintenance
- Simple to integrate and operate
- One year sensor life
|
|
|
Optical Dissolved Oxygen Transmitter Product Description
|
The WQ-FDO Optical Dissolved Oxygen Transmitter is an instrument designed for measuring dissolved oxygen concentrations in
liquids. The WQ-FDO Optical Dissolved Oxygen Transmitters were developed to meet different requirements ranging from surface
water monitoring programs to harsh waste water applications. The optical dissolved oxygen transmitter has been specifically
designed to meet the demanding requirements of the environmental monitoring and scientific research sectors, providing long term,
accurate and reliable dissolved oxygen measurement. The WQ-FDO Optical Dissolved Oxygen Transmitter has extremely low power
requirements and a 4-20 mA output making it ideal for incorporation into remote environmental monitoring installations.
Methodology - Optical Dissolved Oxygen Transmitter
The WQ-FDO Optical Dissolved Oxygen Transmitter's optical measuring technology is based on an attenuated fluorescent signal measured
in a defined time frame. A fluorescent dye is stimulated in the optical dissolved oxygen sensor's membrane by a short wave
length light source. By falling back into the passive state, long wave light is emitted, which is recorded as a measurement
signal. If oxygen contacts the dye by diffusing through the membrane the period of back scattering light is shortened according
to the oxygen concentration of the sample. The optical dissolved oxygen measurement is more or less a highly precision time
measurement. In order to process this time measurement as precisely as possible, the optical dissolved oxygen sensor optics are
calibrated to the speed of light.
Optical Dissolved Oxygen Transmitter Advantages
The WQ-FDO Optical Dissolved Oxygen Transmitter has many advantages over traditional DO sensors. Unlike conventional galvanic
and polargraphic dissolved oxygen sensors, WQ-FDO optical dissolved oxygen transmitters have no consumable cathodes or anodes that
require replacement, minimizing servicing requirements. Neither do the optical dissolved oxygen transmitters consume
oxygen. Consequently the measurement of dissolved oxygen by the optical dissolved oxygen sensor is unaffected by water
flow. The WQ-FDO optical dissolved oxygen transmitters can even be deployed in stagnate groundwater bores. The WQ-FDO
optical dissolved oxygen transmitters have extremely stable electronics – a calibration interval of 1 year is typical.
The measuring and reference path optical components are identically designed inside this optical dissolved oxygen sensor. Natural
aging processes of the optical dissolved oxygen sensor's optical components can therefore be compensated by the reference path and
accordingly compensated in the measuring path. As a result, the optical dissolved oxygen transmitter provides accurate
dissolved oxygen measurements over long periods of time without the need for re-calibration. Additionally by stimulating the
fluorescent reaction in the membrane with low energetic green-light, the fluorescent dye in the sensor membrane won't be bleached
out.
The WQ-FDO optical dissolved oxygen transmitters can be used to monitor dissolved oxygen in almost any liquid, including wines,
beer, and milk. The optical dissolved oxygen sensors are not affected by color of the liquid. With the beveled membrane
design bubbles or aeration do not affect the optical dissolved oxygen transmitter's measurements. There is no chemical
interference from typical wastewater chemicals and the optical dissolved oxygen transmitters can withstand harsh wastewater
applications.
Global Water's PC320 Optical Dissolved Oxygen Controller can use the optical dissolved
oxygen transmitter's 4-20mA output to control pumps or alarms. In addition Global Water offers the
GL500 optical dissolved oxygen recorder which adds recording capabilities and the ability
to report DO concentration and saturation measurements from the 4-20mA optical dissolved oxygen transmitter. The GL500
optical dissolved oxygen recorder connects to the optical dissolved oxygen sensor's 4-20mA output, along with optional
conductivity and barometric pressure sensors, to
record highly accurate dissolved oxygen data.
|
|
|
Optical Dissolved Oxygen Sensor Product Applications
|
- Long term monitoring of dissolved oxygen in streams, rivers and lakes
- Scientific research projects, both long and short term projects
- Water quality monitoring around industrial outfall
- Homeland security
- Thermocline profiling
- Fish farm and aquaculture water quality monitoring
- Wastewater industry
- Food and wine industry
|
|
|
Optical Dissolved Oxygen Transmitter Specifications
|
Dissolved Oxygen
Partial pressure: 0-400 mbar
Accuracy: ± 0.5 % of value
Repeatability: 0.01 ppm
Response time: 90% in less than 60 seconds
Sensor Drift: Less than 1% per year
Temperature: Compensated 32 to 122°F (0 to 50°C)
Temperature:
Accuracy: ±0.2°F (±0.1°C)
Resolution: 0.02°F (0.01°C)
Range: 32 to 122°F (0 to 50°C)
Maximum Pressure: 35 PSI (25m/82ft water depth)
Output: Dual 4-20 mA (Partial Pressure and Temperature)
Operating Voltage: 10-30 VDC
Current Draw: 24 mA plus both sensor outputs
Warm Up Time: 6 seconds minimum, 8 recommended
Operating Temperature: 32 to +122°F (0 to +50°C)
Size of sensor: 8 inch L x 0.86 inch Diameter (202 mm L x 22 cm Dia.)
Sensor Construction: Acetyl, stainless steel, cast epoxy
Weight: 8 oz (227 g) plus cable
|
|
|
Optical Dissolved Oxygen Transmitter Options & Prices
|
Prices listed are for United States and Canada only. Call or e-mail us for pricing in other countries.
Terms and Conditions
|
WQ-FDO Optical Dissolved Oxygen Transmitter (PN# DD0500)
Includes 25 ft of cable. Does not include armoring.
|
$1,196 |
 |
|
WQ SC-FDO Optical Dissolved Oxygen Transmitter Replaceable Membrane (PN# 201330)
|
$166 |
|
WQEXC Extra Cable (DH0000)
Standard Optical Dissolved Oxygen Sensors include 25 ft of cable, but can be purchased with up to 500 ft of cable.
|
$2.10/ft |
|
|
| OPTICAL DISSOLVED OXYGEN SENSORS ACCESSORIES |
|
Optical Dissolved Oxygen Transmitter Plastic Armor (PN# DD0505)
|
$205 |
|
|
Optical Dissolved Oxygen Transmitter Stainless Steel Armor (PN# DD0510)
|
$340 |
 |
|
|
