1.It is especially suitable for online monitoring of dissolved oxygen in the field of environmental protection and sewage treatment such as online monitoring of dissolved oxygen in aeration basin in sewage treatment plant.
2.It can also be applied to water quality monitoring in the field of environmental protection, water supply and aquaculture farm.
1.It adopts microcontroller and menu operation for easy use. It has function of controlling peripheral equipment.
2.It can simultaneously display the dissolved oxygen concentration, saturation level and temperature.
3.It has functions of automatic temperature compensation and cleaning. In addition, it support zero oxygen calibration, full scale calibration and atmospheric pressure calibration.
4.It has isolation output(4～20)mA DC signal, and can have percent speed regulation for output upper limit and lower limit.
5.It has RS-232or RS-485(optional) digital communication port.
6.It has functions of automatic upper and lower limit alarming and data retention.
7.The instrument has four control relays. The two of them are used to output upper and lower limit alarming signal and the other two adopt programmable controller aiming to combine actuation and release time so that the automatic cleaning can be realized.
8.Up to 400 sets of measuring data can be stored and viewed.(including measuring value and storage time.)
9.The structure of electronic unit is plate-type or wall-hung for easy installation, operation and maintenance.
10.The electronic unit case has the protection level of IP65 in order to prevent water spraying and dust pollution.
Dissolved oxygen concentration：(0.00～20.00)mg/L
Dissolved oxygen saturation：(0.0～200.0)%
2. Instrument error range
Dissolved oxygen concentration：±0.30 mg/L；(at reference temperature)
±0.50 mg/L；(The difference between calibrated solution temperature and actual solution temperature should be within ±15℃)
Dissolved oxygen saturation：±5.0%；(at reference temperature)
±10.0%；(The difference between calibrated solution temperature and actual solution temperature should be within ±15℃)
3. Stability<=±0.20 mg/L /24h
4. Repeatability<=0.20 mg/L
5. Output current error of electronic unit should be within±1%(FS)
6. Output upper and lower limit
Dissolved oxygen concentration：It can be chosen within the range of (0～20.00) mg/L(its corresponding output current range is 4mA～20mA )
Dissolved oxygen saturation：It can be chosen within the range of（0～200）%( its corresponding output current range is 4mA～20mA)
7. Temp of measured water sample:(0～45)℃
8. Normal instrument working conditions
b)Power supply: AC voltage(220±22)V，Frequency(50±0.5)Hz
c)There is no corrosive gas in surrounding air.
d)There is no function-affected oscillation in surrounding environment.
e)There is no other disturbance of electromagnetic field apart from geomagnetic field.
9. Dimension (length x width x height )：144mm×144mm×160mm hole size：138mm×138mm
SJGF-1 DO sensor (with holder):
The part which touch with solution is PVC
temperature of measured solution
0.6MPa（The pressure index of jet should be bigger than 0.2MPa）
length of cable
Normally the length is8m