產(chǎn)品描述:
Loop Powered Dissolved Oxygen Monitoring
The 840 Transmitter has been designed to provide accurate, highly reliable measurements in difficult highly fouling applications. The specifically designed sensor utilises a rugged, 100 micron membrane, in combination with a unique electrolyte to provide excellent long term stability, without the need for sensor replenishment or replacement.
The result is amazing - the 840 is so stable that it can measure accurately for years with practically no attention. Service intervals of five years have been reported! Maintenance is as simple as wiping the membrane clean and checking the calibration from time to time. If it should ever be necessary to replace the membrane, this can be done quickly, easily and at very little cost.
When combined with the EasyCal calibration is carried out in 2 minutes with the probe in water. As the sensor does not need to acclimatise in air, errors do not occur by hurried calibrations. As with all aspects of the 840 Transmitter the calibration routine is extremely simple and involves no tables or complicated software features.
To make installation as easy as possible and to help achieve the best possible results we recommend using the Pioneer Probe holder. This places the sensor approximately 300 mm below the surface away from the surface effects of rain, sunshine and fouling. The flexible joint in the mounting shaft allows the sensor to move, providing an anti-fouling and anti-ragging action
技術(shù)參數(shù):
Physical
Weight |
Monitor: 1.0 kg |
|
Sensor: 0.4 kg (inc 5 metres of cable) |
Dimensions (hxwxd) |
Monitor: 121 x 121 x 60 mm |
|
Sensor: 58 mm Diameter, 56 mm long |
Enclosure Rating |
Electronics IP65, Sensor IP68 |
Enclosure Material |
Monitor: ABS |
|
Sensor: Polyoxymethylene |
Cable Entries |
Integral Cable Gland |
Cable Size |
3 core, 5 mm OD |
Cable Length |
10 metres standard, 100 metres maximum |
Environmental Data
Operating Temperature |
Monitor -20 to 60ºC, Sensor 0-50ºC |
Storage Temperature |
-20 to 60ºC |
Location |
Indoor/Outdoor |
Power Supply
Loop Power |
15 - 35VDC |
Max Load |
50 ohm at 15 VDC, 1000 ohm at 35 VDC |
Measurement Principle
Principle |
Galvanic Cell, Self Polarising |
Temperature Compensation |
Self Compensating |
Measurement Characteristics
Response Time |
90% of end value in less than 120 seconds |
Accuracy |
+/- 2% of measured value |
Repeatability |
+/- 0.5% of measured value |
Range |
0-5 to 0-40 mg/l |
|
0-50 to 0-400 %SAT |
Flowrate |
Typcially less than 10 cm/seconds |
User Interface
Display |
LCD Display providing 3 1/2 Digits |
Setup |
via Dip Switches |
Units of Measurement |
mg/l, ppm, %SAT |