Sensecap S-rjy-01 User manual

User Manual

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Dissolved Oxygen Sensor - User Manual

Model: S-RJY-01

Version: V1.0

User Manual

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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

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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

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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

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3. Dimensions

Note: The size sensor connector is a male M16-5 core waterproof connector.

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4. Product installation and wiring

The sensor should be submerged below the liquid surface for fixed installation. Avoid bumping

or scratching the surface of the fluorescent film head during installation and use. The fluorescent film

head part should be prevented from being attached to the bottom sediment. The rubber boot should be

removed when in use.

The cable is a 4-core twisted-pair shielded cable, and the line sequence definition is as follows:

⚫Red wire—power line (12~24VDC)

⚫Black wire—ground wire (GND)

⚫Blue wire—485A+

⚫White wire—485B-

⚫Green wire—shielded wire

Check the wiring sequence carefully before powering on to avoid unnecessary losses due to wrong

wiring.

Note: Considering that the cables have been soaked in water (including sea water) or exposed to the

air for a long time, all wiring points are required to be waterproofed, and the user's cables should have

certain corrosion resistance.

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5. RS485 communication

The Modbus protocol is a common language used in electronic equipment. Through this protocol,

network communication is carried out between devices. It has become a common industry standard

and is widely used in data collectors, sensor equipment, etc. Based on this protocol, devices produced

by different manufacturers can communicate with each other for system integration.

The Modbus protocol is a master-slave protocol. One node is the master, and other nodes

participating in the communication using the Modbus protocol are slaves. Each slave device has a

unique address. The sensor has an RS485 interface and supports the Modbus-RTU protocol. Sensing

data and communication parameters can be obtained or modified by Modbus commands.

Note:

Default communication parameters:

Address 55(DEC), baud rate 9600bps, 1 start bit, 8 data bits, no parity, 1 stop bit.

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Frame format

1. Read data instruction frame:

xx xx

address

function code

number of

registers

CRC check

code (low byte

first)

2. Read data response frame:

xx xx

address

function code

bytes

CRC

Check code

(low byte first)

3. Write data instruction frame:

xx xx

address

function code

write data

Check code

(low byte first)

Write data response frame (same as write data command frame):

xx xx

address

function code

write data

Check code

(low byte first)

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address

(DEC/HEX)

Name

Description

Number of

registers

Method

44353

(0x1100)

switch machine

Write data 1 when power on, write data

0 when power off. The power-on default

is the power-on state.

1 (2 bytes)

Write

40001

(0x0000)

measured value

+ temperature

4 double-byte integers, which are the

measured value, the decimal place of

the measured value, the temperature

value, and the decimal place of the

temperature value.

4 (8 bytes)

read

40001

(0x0000)

measurements

mg/L value x100 (for example: ODO of

1.02mg/L is displayed as 102, with 2

decimal places by default.)

1 (2 bytes)

read

40003

(0x0002)

temperature

value

°C value x10 (for example: the

temperature of 25.6 °C is displayed as

256, and the default is 1 decimal

place. )

1 (2 bytes)

read

40005

(0x0004)

Dissolved

oxygen

saturation

(0~200%)

2 double-byte integers, which are the

saturation value and the number of

decimal places respectively.

2 (4 bytes)

read

44097

(0x1000)

Zero calibration

Calibration in anaerobic water, write

data is 0; read data is zero offset.

1 (2 bytes)

write

/read

44101

(0x1004)

slope

calibration

Calibration in air-saturated water, write

data is 0; read data is slope value ×

1000.

1 (2 bytes)

write

/read

44113

(0x1010)

temperature

calibration

When calibrating in solution, the written

data is the actual temperature value ×

10; the read data is the temperature

calibration offset × 10.

1 (2 bytes)

write

/read

44129

(0x1020)

salinity

compensation

The read/write data is salinity value

(PSU)×10, which is used for salinity

compensation; the factory default is 0,

no salinity compensation. The written

value range is 0~500, corresponding to

0~50.0 PSU.

1 (2 bytes)

write

/read

48195

(0x2002)

sensor address

The default is 55(DEC), and the write

data range is 1~127.

1 (2 bytes)

write /

read

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48225

(0x2020)

reset sensor

The calibration value is restored to the

default value, and the written data is 0.

Note: After the sensor is reset, it needs

to be calibrated again before it can be

used.

1 (2 bytes)

Write

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Command example

1. Boot command:

Function: Let the sensor emit light continuously and start measuring the dissolved oxygen value.

Request frame: 06 06 11 00 00 01 4C 81

Response frame: 06 06 11 00 00 01 4C 81

2. Start measuring command:

Function: Obtain the temperature and dissolved oxygen value measured by the sensor; the unit of

temperature is ℃, and the unit of dissolved oxygen value is mg/L.

Request frame: 06 03 00 00 00 04 45 BE

Response frame: 06 03 08 01 02 00 02 00 B0 00 01 D4 48

Example readings:

Dissolved oxygen value

temperature value

01 02 00 0 2

00 B0 00 01

For example: dissolved oxygen value 01 02 indicates the dissolved oxygen value read in

hexadecimal , 00 0 2 indicates the dissolved oxygen value with 2 decimal points (the decimal point is

related to the range), and the converted decimal value is 2.5 8 .

The temperature value 00 B0 represents the temperature value of the hexadecimal reading, 00 01

represents the temperature value with 1 decimal point, and the converted decimal value is 17.6.

3. Calibration instructions:

(1) Zero calibration

Function: Set the dissolved oxygen zero point calibration value of the sensor , the example is as follows:

Request frame: 06 06 10 00 00 00 8C BD

Response frame: 06 06 10 00 00 00 8C BD

(2) Slope calibration

Function: Set the dissolved oxygen slope calibration value of the sensor; here, the slope value

calibration is performed in air-saturated water.

Request frame: 06 06 10 04 00 00 CD 7C

Response frame: 06 06 10 04 00 00 CD 7C

4. Set device ID address:

Function: set the Modbus device address of the sensor; change the sensor address 06 to 01, the example

is as follows

Request frame: 06 06 20 02 00 01 E3 BD

Response frame: 06 06 20 02 00 01 E3 BD

5. Salinity compensation command:

Function: Set the salinity compensation of the sensor; measure the water body with a salinity of 35.0

PSU, add salinity compensation, the example is as follows:

Request frame: 06 06 10 20 01 5E 0D 1F

Response frame: 06 06 10 20 01 5E 0D 1 F

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Error response

If the sensor cannot execute the host computer command correctly, it will return information in the

following format:

definition

address

function code

CODE

CRC check

data

ADDR

COM+80H

CRC16

Bytes

(1) CODE: 01 - wrong function code

03 - data error

(2) COM: Received function code

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Use the serial port debugging software to communicate

Users can use any serial port debugging software to communicate with the sensor. Pay attention

when communicating, select the correct serial port, baud rate, and other serial port communication

parameters, and the data that needs to be sent and received must be transmitted and displayed in

hexadecimal .

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6. Maintenance

Use and Maintenance

Operation

Recommended maintenance

Cleaning sensor probe

Wash it every 30 days

Check the sensor and fluorescent film

heads for damage

Check it every 30 days

Replace the fluorescent film head

Replace it 1~2 years

Calibrating sensor

3~6 months

⚫External surface of the sensor: Clean the external surface of the sensor with tap water. If debris

remains, wipe it with a damp soft cloth. For some stubborn dirt, you can add some household

detergent to the tap water to clean it.

⚫Check the cable of the sensor: the cable should not be tight during normal operation, otherwise it

is easy to break the wire inside the cable and the sensor cannot work normally.

⚫Check whether the measurement window of the sensor is dirty and whether the cleaning brush is

normal.

⚫Sensors contain sensitive optics and electronics. Make sure the sensor is not subject to severe

mechanical impact. There are no user-maintainable parts inside the sensor.

Calibration

a）Zero calibration

Use a larger beaker to measure an appropriate amount of zero dissolved oxygen liquid, place the

sensor vertically in the solution, the sensor measuring end is at least 10cm away from the bottom of

the beaker, wait for 3 to 5 minutes for the value to stabilize and perform zero calibration.

b) Slope Calibration

Place the measuring end of the sensor in the standard solution, the measuring end of the sensor

should be at least 10cm away from the bottom of the beaker, wait for 3 to 5 minutes for the value to

stabilize, and perform slope calibration.

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