SENSECAP S-RJY-01 User manual

User Manual
©2008-2023 Seeed Technology Co., Ltd. All rights reserved. www.seeedstudio.com
第1 页共14 页
Dissolved Oxygen Sensor - User Manual
Model: S-RJY-01
Version: V1.0

User Manual
©2008-2023 Seeed Technology Co., Ltd. All rights reserved. www.seeedstudio.com
第2 页共14 页
Table of contents
1. Background meaning and working principle....................................................................................................... 3
Background meaning ............................................................................................................................... 3
Working principle .................................................................................................................................... 3
2. Technical Parameters ........................................................................................................................................... 4
3. Dimensions .......................................................................................................................................................... 5
4. Product installation and wiring ............................................................................................................................ 6
5. RS485 communication......................................................................................................................................... 7
Frame format ........................................................................................................................................... 8
Register address....................................................................................................................................... 9
Command example ................................................................................................................................ 11
Error response........................................................................................................................................ 12
Use the serial port debugging software to communicate ....................................................................... 13
6. Maintenance....................................................................................................................................................... 14
Use and Maintenance............................................................................................................................. 14
Calibration ............................................................................................................................................. 14

User Manual
©2008-2023 Seeed Technology Co., Ltd. All rights reserved. www.seeedstudio.com
第3 页共14 页
1. Background meaning and working principle
Background meaning
Dissolved oxygen (DO) refers to the content of oxygen dissolved in water, which is expressed in
milligrams of oxygen per liter of water, and dissolved oxygen exists in water in a molecular state. The
amount of dissolved oxygen in water is one of the important indicators of water quality and one of the
important factors of water purification.
The content of dissolved oxygen in water is related to factors such as atmospheric pressure, water
temperature and salinity. For water bodies not polluted by oxygen-depleting substances (generally
organic matter), the dissolved oxygen is saturated, for example, the dissolved oxygen in clean surface
water is close to saturation. When there is a lot of organic matter in the water body, the oxygen
consumption rate exceeds the oxygen supply rate, and the dissolved oxygen in the water will continue
to decrease, even close to zero, so that the organic matter will decompose under the anoxic condition,
and the phenomenon of corruption and fermentation will occur, making the water quality serious.
deterioration. Therefore, in the quality evaluation of water bodies, dissolved oxygen is used as an
indicator of the degree of water pollution.
Working principle
S-RJY-01 integrated online fluorescence method dissolved oxygen sensor is designed based on the
principle of quenching excitation fluorescence by specific substances in physics. When the excitation
light is irradiated on the fluorescent substance on the surface of the fluorescent film head, the
fluorescent substance is excited and emits fluorescence, and the extinguishing time of the fluorescence
is affected by the concentration of oxygen molecules on the surface of the fluorescent film head. The
concentration of oxygen molecules can be calculated by detecting the phase difference between the
fluorescence and the excitation light and comparing with the internal calibration curve, and the final
value is output after temperature and salinity compensation.
⚫No electrolyte required, no polarization
⚫No need to consume oxygen, not affected by flow rate
⚫Built-in temperature sensor, automatic temperature compensation
⚫Built-in salinity compensation, flexible parameter setting
⚫Not interfered by chemicals such as sulfides
⚫Small drift, fast response, more accurate measurement
⚫Long service life and lower cost
⚫Fluorescent membrane head is easy to replace and easy to maintain
⚫RS-485 interface, Modbus/RTU protocol
⚫Low power consumption and anti-interference design

User Manual
©2008-2023 Seeed Technology Co., Ltd. All rights reserved. www.seeedstudio.com
第4 页共14 页
2. Technical Parameters
Model
S-RJY-01
Measuring principle
Fluorescence
Measuring range
0～20.00mg/L (0～200% saturation, 25℃)
Precision
±2%F.S., ±0.3℃
Resolution
0.01mg/L, 0.1℃
Calibration method
Two-point calibration
Temperature
compensation
Automatic temperature compensation (Pt1000)
Output method
RS-485(Modbus/RTU)
Operating conditions
0～50 ℃, <0.2MPa
Storage temperature
-5～65℃
Installation method
Immersion installation, 3/4" NPT pipe thread
Material
PC, stainless steel
Cable length
5 meters
Power consumption
0.3W@12V
Power supply
12~24VDC (typical value 12V)
Degree of protection
IP68

User Manual
©2008-2023 Seeed Technology Co., Ltd. All rights reserved. www.seeedstudio.com
第5 页共14 页
3. Dimensions
Note: The size sensor connector is a male M16-5 core waterproof connector.