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Portable Dissolved Oxygen Meter  JPBJ-607 D. O. meter Analyzer

Specification
Range: 0.00~19.99mg/L 　0.0~255.0%
Resolution: 0.01mg/L 　0.1%
Accuracy: ±1.5%F.S
Temperature Compensation: 0~45℃
Power Supply: DC 9V
Dimensions: 123mm×72mm×33mm
Dissolved oxygen meter 
1. general
2. specifications
3. structure of the meter
4. operation and calibration
5. maintenance
6. appendix
 
1. General
It’s a portable instruments designed for using at work site. It can measure dissolved oxygen measurement and temperature.
 
2. Specification
2.1 measuring range: (0.00-20.0) mg/L Temperature: (0.0-40.0)℃
2.2 automatic temperature range: (0.0-40.0)℃
2.3 accuracy of electric unit: + 0.1mg/L + 1bit
2.4 Accuracy:
Dissolved oxygen:
 +0.1mg.L-1 (at same calibration and measuring temperature)
+0.5mg.L-1 (at +10℃ difference between calibration and measuring temperature)
Temperature: +1℃
 
2.5 electronic unit stability: 0.1mg/L + 1 bit within 3 hour.
2.6 Stability of the meter: 0.2mg/L + 1 within 1 hour
2.7 Response time: not more than 30 seconds( at 20℃, 90% response)
2.8 Residual current: not more than 0.15mg/L + 1
2.9 Working environment:
Ambient temperature: (0.0-40.0)℃
Relative humidity: not more that 85%
Temperature of samples to be measured: (0.0-40.0)℃
Power supply: AA battery
No obvious electromagnetic interference except terrestrial magnetic fields.
Size: 165x 75 x 30 mm
net Weight: 0.3kg
gross weight: 3kg
3. structure:
3.1 structure of instruments
 
1. display screen
2. electrode socket
3. back light screen button
4. power on/ off
5. mode key
press this key, you can switch to “dissolved oxygen measure/zero oxygen calibration/span calibration/salinity setting.
6. set key
press this key to store the value when it is at /zero oxygen calibration/span calibration/salinity setting.
 7. ↑key 8. ↓key adjust the salinity value when it is working at salinity setting.
9.electrode
When it shows “LOBAT” on screen, you should change battery.
3.2 electrode
 
1. screw, connect to electrode socket
2. oxygen electrode.
 
4. operation and calibration
 1. put into the battery.
2. press power key, the instruments can start working automaticly, there’s four mode of working.
You can switch the working mode by # 5 mode key .
When it shows:
　
It is measuring dissolved oxygen.
Remarks: when the electrode is not connected, or the temperature electrode doesn’t work, the insruments will show 25℃, the dissolved oxygen will be measured as 25℃
If it is the first time to use it, or you havn’t used it for quite a long time, you should calibrate the electrode according to charper No.4.3
 4.3 calibration.
New electrode, electrode that not used for over 24 hours,when new solution is installed, the electrode need to be polarized for 30-60 minutes,
When electrode left the instruments, or the instrument is off for 1 hour,the electrode should be polarizedfor 5—25 minutes.
4.3.1
Zero oxygen calibration
Put the dissolved oxygen electrode into newly made 5% sodium sulphate solution, when the instruments is in the mode of measure dissolved oxygen, press mode key switch to zero oxygen calibration, store the value when the reading is stable.
For zero calibration, it will shows this in screen:
　
Then finish zero calibration, press mode key again switch to full calibration.
Get out the electrode from the solution, clean it with water and dry it with clean paper. Put the electrode over the surface of stilled water, but not contact the water.
Press set key to store the value when the reading is stable. full calibration finish.
Screen is as follows when setting full calibration.
 
Press mode key again to switch to salinity setting.
Default salinity value is 0.00, choose a right salinity value before measure dissolved oxygen. You can set the salinity value by pressing key# 7, key # 8.
 5. maintenance
The dissolved oxygen electrode should be stored in distilled water. DO NOT put it into the sodium sulphate solution.