Sper Scientific Instruments 870007 Inline Dissolved Oxygen Analyzer
Introduction
Industrial Inline Dissolved Oxygen Analyzer offers excellent functionality, stable performance, easy operation, low power consumption along with the highest safety and reliability.
The dissolved oxygen analyzer can be widely used in industrial application such as thermal power generation, chemical industry, metallurgy, environmental protection, pharmaceutical, biochemical, food and tap water.
Technical Features
- Extremely quickly and precision dissolved oxygen sensor.
- It is suitable for harsh application and maintenance-free.
- Provides two ways of 4-20mA output for dissolved oxygen and temperature.
- With data recording function, user easy to check history data and history curve.
Technical Specifications
| Specifications | Details |
| Name | Inline Dissolved Oxygen Analyzer |
| Shell | ABS plastic |
| Power Supply | 90V ~ 260V AC 50/60Hz |
| Power Consumption | 4W |
| Output | Two 4-20mA output tunnels, RS485 |
| Relay | 5A/250V AC 5A/30V DC |
| Size | 144mm×144mm×104mm |
| Weight | 0.9kg |
| Protocol | Modbus RTU |
| Range | 0.00 mg/L ~20.00 mg/L 0.00 % ~200.00 % -10.0 ℃ ~100.0 ℃ |
| Accuracy | ±1%FS ±0.5℃ |
| Waterproof Level | IP65 |
| Storage Environment | -40℃~70℃ 0%~95%RH (non-condensing) |
| Working Environment | -20℃~50℃ 0%~95%RH (non-condensing) |
Installation and Wiring
SIZE 
Installation 
Wiring 
Operation Interface
There are 2 modules in the main panel of the dissolved oxygen measuring instrument, LED LCD display module and button module. Users can set and adjust the parameters of the instrument through the 5 buttons on the panel.
- Set/Exit button
- Select/Shift button
- Up button
- Down button
- Confirm button
- LED screen
Measurement interface
Enter the main measurement interface after the start-up animation.
When the instrument is working normally, the LED display shows the following content. 
- Measurement value
- Unit
- Temperature
- Real-time date
- Real time
- Measurement status
- 4-20mA corresponding value of dissolved oxygen
- Relay status
- Mode
Setting
- Press “Set/Exit Button” to enter the password input interface.
Enter settings:
Enter the password “3700” to enter the setup menu.
Unit
In this menu, users can change the measurement method. 
20mA
In this menu, users can change the corresponding value of 4-20mA and set the corresponding effective range.
ModbusRTU communication
In this menu, users can change the communication address and rate. 
Temperature
In this menu, users can set the temperature offset and manually set the temperature. 
Simulation
In this menu, users can simulate the 4-20mA current output. The current output can be verified by simulating the measurement of the IO1 (measured value) and IO2 (temperature) ports. The release relay is closed. The relay is simulated and verified.
Relay1
In this menu, users can switch the relay 1 function, set the parameter alarm upper limit value, alarm return difference value, and alarm delay time.
Relay2
In this menu, users can switch the relay 2 function, set the parameter alarm lower limit value, alarm return difference value, and alarm delay time.
Relay3
In this menu, users can set the relay 3 function, set the cleaning time and cleaning cycle.
Storage
In this menu, users can set the storage function (default off), clear storage memory and recording interval. 
Date&Time
In this menu, users can change date and time according to different time zone. 
Language
Users can choose English or Chinese according to need. 
Backlight
In this menu, users can change the backlight mode of the LCD screen. The backlight can be always on or delayed off (the default is delayed off), the backlight brightness can be changed (brightness level 1-5, brightness increases), and the contrast can be changed.
Factory data reset
In this menu, users can restore the current output and relay to the factory parameters. 
Calibration
Press “ESC” to enter the password input interface. 
Enter calibration menu:
Enter the password “3900” to enter the calibration menu. 
Parameter Calibration
In this menu, users can manually change the parameters of atmospheric pressure and salinity. 
Zero Calibration
In this menu, users shall put the electrode into anaerobic water. When the value comes stable, press ‘Enter’ buttom. 
Saturated Calibration
In this menu, users shall put the electrode into air. When the value comes stable, press ‘Enter’ buttom. 
Given Value Calibration
Put the electrode in the measuring liquid of known concentration, set it to the ppb value of the solution of known concentration, and press the confirm key.
Factory data reset
In this menu, users can restore the calibration parameters to the factory parameters. 
History Data Display
Press “ESC” to enter the password input interface. 
Enter History Data Display:
- Enter the password “1300” to enter the History Data Display.
- Press the up and down keys to switch the display. It can store up to 1000 records and overwrite automatically if reach maximum.
Waveform Display
Press “ESC” to enter the password input interface. 
Enter Waveform Display:
Enter the password “1400” to enter the Waveform Display. Press the up and down keys to switch the display.
Appendix
Communication protocol
Communication parameters:
- Baudrate:4800, 9600, 19200(9600default)
- Serial data format: 8N1(8 data bits, No parity, 1 stop bit) Function code: 03
- Device address: Dissolved oxygen analyzer defaults to 3
Register definition:
| Register
address(Dec) |
Definition | R/W | Remarks |
| 0 | Temp | R | ×0.1℃，sint16 |
| 1 | DO | R | ×0.01mg/L，uint16 |
| 2 | nA | R | ×0.01nA，uint16 |
| 3 | Saturation | R | ×0.1%，uint16 |
| 8 | RTU Address | R/W | Modbus communication address，DO defaults 3. |
| 9 | Baudrate | R/W | 4800，9600，19200，9600 as default |
Examples of communication formats:
Data reading instruction
Addr. + Func. + Register start address + Number of Registers read + CRC check code (Hex) e.g. Tx:03 03 00 01 00 01 D4 28
| Address | Func. | Register start address | Number of Registers read | CRC check
code |
| 03 | 03 | 0001 | 0001 | D428 |
Data return instruction:
Address + Func. + Data length + Data + CRC check code (Hex) e.g. Rx:03 03 02 00 DF 80 1C
| Address | Func. | Data length | DO value | CRC check
code |
- The hexadecimal number DF is converted to decimal by a calculator (programmer mode) to obtain the value 223.
- The actual value contains 2 decimal places, then the actual value is 223×0.01= 2.23
Electrode parameter table of Online Dissolved Oxygen Analyzer
| Type | DOG-209FA |
| DO Range | 0.00mg/L~20.00mg/L |
| Temperature Range | 0.0℃~60.0℃ |
| Accuracy | 3%，±0.5℃ |
| Withstand pressure | 0.06MPa |
| Waterproof level | IP68/NEMA6P |
| Polarization time | 60min |
| Deviation | ±＜0.1mg/L |
Sper Scientific Instruments www.sperdirect.com
FAQ
- Q: What are the industries where the dissolved oxygen analyzer can be used?
A: The analyzer can be used in thermal power generation, chemical industry, metallurgy, environmental protection, pharmaceutical, biochemical, food, and tap water industries. - Q: Is the dissolved oxygen sensor suitable for harsh environments?
A: Yes, the dissolved oxygen sensor is suitable for harsh applications and is maintenance-free.
Documents / Resources
 |
Sper Scientific Instruments 870007 Inline Dissolved Oxygen Analyzer [pdf] User Manual 870007 Inline Dissolved Oxygen Analyzer, 870007, Inline Dissolved Oxygen Analyzer, Dissolved Oxygen Analyzer, Oxygen Analyzer |