Renke RS-LDO-N01-1 Fluorescence Dissolved Oxygen Transmitter User Manual

RS-LDO-N01-1 Fluorescence Dissolved Oxygen Transmitter

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Specifications

• Powered by: DC 10~30V

• Power consumption: 0.2W

• Communication Interface: RS485; standard MODBUS-RTU
  protocol

• Baud rate: Default 4800 (1200, 2400, 4800, 9600, 19200, 38400,
  57600, 115200 can be set)

• Measuring principle: Fluorescence measurement method

• Measuring range: 0~20mg/L (0~200% saturation)

• Measurement deviation: Resolution – 0.01mg/L; 0.1%

• Response time: 60s

• Working conditions: 0~40°C

• Fluorescent film lifetime: 1 year of normal use

• Waterproof level: IP68

• withstanding voltage: 0.6MPa

• Electrode wire length: Default 5m

• Shell material: Corrosion resistant plastic, stainless
  steel

Product Usage Instructions

1. Installation

The sensor should be immersed below the liquid level and fixedly
installed. Avoid bumping or scratching the surface of the
fluorescent film head during installation and use. Prevent the
fluorescent film head part from being attached to underwater
sediments. Remove the rubber protective sleeve during use. For
submerged installation, use a waterproof pipe provided by the
company.

2. Calibration

To calibrate the device, follow the calibration instructions
provided in the user manual. Calibration ensures accurate readings
of dissolved oxygen concentration.

3. Maintenance

Regularly clean the sensor to maintain accurate measurements.
Inspect the equipment for any signs of damage and replace any
worn-out parts promptly.

4. Data Communication

Connect the transmitter to a computer using the RS485
communication interface with MODBUS RTU protocol for monitoring and
data communication.

FAQ

Q: What is the measuring range of the dissolved oxygen

concentration?

A: The measuring range is from 0 to 20mg/L or 0 to 200%
saturation.

Q: How often should calibration be performed?

A: Calibration should be performed periodically as recommended
in the user manual or whenever accuracy is in question.

Q: Can the transmitter be used in extreme temperatures?

A: The transmitter is designed to work in temperatures ranging
from 0 to 40°C.

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RS-LDO-N01-1 Fluorescence Dissolved Oxygen Transmitter User ManualV2.0
RS-LDO-N01-1 Fluorescence Dissolved
Oxygen Transmitter User manual
Document version:V2.0

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RS-LDO-N01-1 Fluorescence Dissolved Oxygen Transmitter User ManualV2.0

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RS-LDO-N01-1 Fluorescence Dissolved Oxygen Transmitter User ManualV2.0
Catalog
1. Product description …………………………………………………………………………………………………..4 1.1 Function features ……………………………………………………………………………………………..4 1.2 Equipment technical parameters ………………………………………………………………………..4 1.3 Product model ………………………………………………………………………………………………… 5 1.4 Product List …………………………………………………………………………………………………….5 1.5 Equipment size ………………………………………………………………………………………………..5 1.6 Device installation ………………………………………………………………………………………….. 5
2. Equipment instructions ……………………………………………………………………………………………..6 2.1 Wiring instructions …………………………………………………………………………………………. 6 2.2 Parameter configuration description …………………………………………………………………..6 2.3 Calibration instructions …………………………………………………………………………………….7 2.4 MODBUS communication and register details …………………………………………………… 8
3. Precautions and maintenance ………………………………………………………………………………….. 11 4. Appendix ……………………………………………………………………………………………………………… 12 5. Contact information ………………………………………………………………………………………………..13 6. Document history ………………………………………………………………………………………………….. 13

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RS-LDO-N01-1 Fluorescence Dissolved Oxygen Transmitter User ManualV2.0
1. Product description

This product is a device for measuring the concentration of dissolved oxygen in a solution. It

adopts the principle of fluorescence measurement, does not consume oxygen, and does not require

electrolyte. Built-in temperature transmitter with automatic temperature compensation function.

The calibration function provides a simpler and more convenient way to calibrate. Can be widely

used in water treatment, aquaculture, environmental monitoring and other industries.

1.1 Function features

Dissolved oxygen measurement range is 0~20mg/L (0~200% saturation). RS485 communication interface: MODBUS RTU communication protocol can be easily

connected to the computer for monitoring and communication.

The Mod Bus communication address can be set, and the baud rate can be modified.

The equipment adopts wide voltage power supply, DC 10~30V can be used. The principle of fluorescence measurement is adopted, no oxygen is consumed, and no

electrolyte is required.
1.2 Equipment technical parameters

powered by

DC 10~30V

Power consumption

0.2W

RS485; standard MODBUS-RTU protocol; communication

Communication Interface baud rate: default 4800(1200, 2400, 4800, 9600, 19200, 38400,

57600, 115200 can be set)

Measuring principle

Fluorescence measurement method

Measuring range

0~20mg/L (0~200% saturation)

Measurement deviation

±3%FS; ±0.5 (25)

Resolution

0.01mg/L; 0.1%; 0.1

Response time

60s

Equipment working conditions

0~40

Fluorescent film lifetime

1 year of normal use

Waterproof level

IP68

Withstanding voltage

0.6MPa

Electrode wire length

Default 5m

Shell material

Corrosion resistant plastic, stainless steel

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RS-LDO-N01-1 Fluorescence Dissolved Oxygen Transmitter User ManualV2.0
1.3 Product model

RS-

Company code

LDO-

Fluorescence Dissolved Oxygen Transmitter

N01-

RS485(Mod bus RTU protocol)

1

Split probe

20

0~ 20.00mg/L (0~ 200% saturation, 25)

1.4 Product List
Fluorescence Dissolved Oxygen Transmitter 1pc Switching module 5m cable Protective nets, cable ties Certificate of conformity, warranty card, etc.
1.5 Equipment size

1.6 Device installation
The sensor should be immersed below the liquid level and fixedly installed. Avoid to 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 with the underwater sediments. The rubber protective sleeve should be removed during use. Submerged installation: Can be used match with the waterproof pipe of our company.

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RS-LDO-N01-1 Fluorescence Dissolved Oxygen Transmitter User ManualV2.0
2. Equipment instructions

2.1 Wiring instructions
Power supply

Wire color brown

Instruction V+(10~30V DC)

black

V-

communication

yellow(green)

485-A

blue

485-B

2.2 Parameter configuration description

Open the data package, select “Debug software” — “485 parameter configuration software”,

find

and just open it

1. Select the correct COM port (view the COM port in “My computer–Properties–Device

Manager–Port”). The following figure lists the driver names of several different 485 converters.

2. Connect only one device separately and power it on, click the test baud rate of the software, the software will test the baud rate and address of the current device, the default baud rate is 4800bit/s, and the default address is 0x01. 3) Modify the address and baud rate according to the needs of use, and at the same time query the current function status of the device. 4) If the test is unsuccessful, please recheck the equipment wiring and 485 driver installation.

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RS-LDO-N01-1 Fluorescence Dissolved Oxygen Transmitter User ManualV2.0
2.3 Calibration instructions
2.3.1 Calibration preparation
Zero oxygen standard solution preparation: In a place without wind and direct sunlight, take enough pure water (distilled water, deionized water) that can cover the stainless steel part of the equipment, add 5g anhydrous sodium sulfite in every 95g water, stir fully to dissolve to get the 5% sodium sulfite solution, leave it for 1 hour to ensure that the oxygen in the solution is consumed completely. Trace cobalt chloride can be added as catalyst if conditional.
100% oxygen environment preparation: In a place without wind and direct sunlight, take enough pure water (distilled water, deionized water) that can cover the stainless steel part of the equipment, use an air pump, continue to expose air to the water for 1 hour, and then stand for 30 minutes to get an air saturated water. Or in a place where there is no wind or direct sunlight, use a closed container, take a small amount of water and shake it vigorously for 30 seconds to get the water-saturated air. During calibration, the fluorescent film of the equipment is kept about 1cm away from the water surface to ensure that the fluorescent film is moist but without water beads.
2.3.2 Calibration
Find the dissolved oxygen tab in the water quality sensor tab of the configuration tool.

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RS-LDO-N01-1 Fluorescence Dissolved Oxygen Transmitter User ManualV2.0

Put the sensor in a 100% oxygen environment, and after the dissolved oxygen value is stable,

click the full-scale calibration button to complete the calibration of 100% oxygen saturation.

Then put the sensor in the zero oxygen standard solution,stir it gently to accelerate the

response, stand it. After the dissolved oxygen value is stable, click the zero oxygen calibration

button to complete the zero oxygen calibration. Note: The device should standing in each calibration environment longer enough, to ensure
the device temperature is same with the environment temperature.
2.4 MODBUS communication and register details

2.4.1 Basic parameters of device communication

Code

8-bit binary

Data bit

8-bit

Parity check bit

no

Stop bit

1-bit

Error checking

CRC (Redundant Cyclic Code)

Baud rate

Factory default is 4800bit/s

2.4.2 Data frame format definition

Using Modbus-RTU communication protocol, the format is as follows:

Initial structure 4 bytes of time

Address code = 1 byte

Function code = 1 byte

Data area = N bytes

Error check = 16-bit CRC code

Time to end structure 4 bytes

Address code: the address of the transmitter, which is unique in the communication network

(factory default 0x01).

Function code: the command function instruction issued by the host.

Data area: The data area is the specific communication data, pay attention to the high byte of

16bits data first!

CRC code: two-byte check code.

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RS-LDO-N01-1 Fluorescence Dissolved Oxygen Transmitter User ManualV2.0
2.4.3 Register address

Register Support function code
address

Illustrate

0x0000, 0x0001

0x03/0x04

Dissolved oxygen saturation (%; floating point number big endian)

0x0002, 0x0003 0x0004, 0x0005
0x1010

0x03/0x04 0x03/0x04 0x06/0x10

Dissolved oxygen concentration (mg/L; floating point number big endian)
Temperature (; floating point number big endian)
Calibration (write 0x0001 calibration zero point, Write 0x0002 to calibrate 100% saturation point)

0x1020 0x03/0x04/0x06/0x10 Salinity (; 16-bit unsigned integer, default 0)

0x1022

Atmospheric pressure (kPa; default 101.33, 16-bit unsigned 0x03/0x04/0x06/0x10
integer, actual value expanded 100 times)

0x07D0 0x03/0x04/0x06/0x10 1~254(16-bit unsigned integer, factory default 1)

0 represent 2400, 1 represent 4800, 2 represent 9600

0x07D1 0x03/0x04/0x06/0x10 3 represent 19200, 4 represent 38400, 5 represent 57600

6 represent 115200, 7 represent 1200

2.4.4 Communication protocol example and explanation

Example 1: Read the current dissolved oxygen saturation (%), dissolved oxygen concentration

(mg/L) and temperature of the device with address 01

Send frame:

Address code

Function code

Register address

Register content

Check code low Check code high

bit

bit

0x01

0x03

0x00 0x00 0x00 0x06

0xc5

0xc8

Reply frame:

Address Function Number of

code

code valid bytes

Register content

Check code Check code low bit high bit

0x01

0x03

0x0c

0x3f 0x6a 0xeb 0x52 0x40 0xe2 0x48 0xb0 0x41 0xe5 0x85 0xc5

0xa7

0x49

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RS-LDO-N01-1 Fluorescence Dissolved Oxygen Transmitter User ManualV2.0
The floating point number big endian 3f 6a eb 52 is 0.917653, which means that the dissolved oxygen saturation is 91.8% The floating point big endian 40 e2 48 b0 is 7.071373 The dissolved oxygen concentration is 7.07mg/L The floating point number big endian 41 e5 85 c5 is 28.690317, which means the temperature is 28.7 Example 2: Write atmospheric pressure Send frame: write atmospheric pressure 101.35kPa to the device with address code 1 Write 10135 to the 0x1022 register, convert to hexadecimal is 2797

Address code

Function code

Register address

Register content

Check code low Check code high

bit

bit

0x01

0x06

0x10 0x22 0x27 0x97

0x77

0x5e

Response frame: (According to the MODBUS standard, the response is a mirrored message of the send frame)

Address code

Function code

Register address

Register content

Check code low Check code high

bit

bit

0x01

0x06

0x10 0x22 0x27 0x97

0x77

0x5e

Example 3: Zero point calibration Writes 0x0001 to the 1010H register after the sensor value is stable in oxygen-free water.

Address code

Function code

Register address

Register content

Check code low Check code high

bit

bit

0x01

0x06

0x10 0x10 0x00 0x01

0x4d

0x0f

Reply frame: (According to the MODBUS standard reply is a mirrored message of the send frame)

Address code

Function code

Register address

Register content

Check code low Check code high

bit

bit

0x01

0x06

0x10 0x10 0x00 0x01

0x4d

0x0f

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RS-LDO-N01-1 Fluorescence Dissolved Oxygen Transmitter User ManualV2.0
3. Precautions and maintenance
When there is an obvious failure of the equipment, please do not open it and repair it yourself,
and contact us as soon as possible! Avoid collision or scratching of the fluorescent film on the front of the equipment. Any
damage will cause the measurement accuracy to drop or even be unusable. Avoid using it in organic solvents, and avoid using organic solvents to clean the fluorescent
cap. When installing the equipment, try to avoid excessive tension or stress on the cables. Equipment cleaning:
For the outer surface of the equipment, it can be cleaned with tap water and wiped with a moist soft cloth. For some stubborn dirt, you can add some household detergent to the tap water to cleaning.
For the outer surface of the fluorescent cap,you can clean the dirt on the light window of the sensor with clean water. If it needs to be wiped, wipe it gently with a soft cloth, do not scrape hard, to prevent damage the fluorescent film, resulting in inaccurate measurement settings and unable to measure.
If there is dust or water vapor in the fluorescent cap: unscrew the fluorescent cap, rinse the inner surface of the fluorescent cap and the optical glass window of the equipment with tap water. If there is dirt with grease-like, it can be cleaned with tap water which is mixed with household detergent, and then rinse the detergent, wipe all the cleaned surface with a soft lint-free cloth, and then put it in a dry place to completely evaporate the water.
It is recommended to wash every 30 days. Before measuring, the black rubber protective cover should be removed. For long-term storage, should add water to the sponge in the protective cover and squeeze out
excess water to ensure that the fluorescent film is wet, and the temperature should be kept
above 0 to prevent the fluorescent film from freezing and damage If store in a dry place,
the temperature can be as low as -10 . When use it again, the device needs to be soaked in
water for 48 hours to restore the response of the fluorescent membrane. It is recommended to replace the fluorescent film once a year. The equipment should be calibrated before each measurement. It is recommended to calibrate
it every 3 months for long-term use. The calibration frequency should be adjusted according
to different application conditions (the degree of dirt in the application, the deposition of
chemical substances, etc.).

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4. Appendix

RS-LDO-N01-1 Fluorescence Dissolved Oxygen Transmitter User ManualV2.0

Table of dissolved oxygen values in air Air pressure 101.32KP

Temperature ()
0 1 2 3 4 5 6 7 8 9 10

Dissolved oxygen (mg/L)
14.63 14.23 13.84 13.47 13.11 12.78 12.45 12.15 11.85 11.57 11.30

Temperature ()
11 12 13 14 15 16 17 18 19 20 21

Dissolved oxygen(m
g/L)
11.04 10.79 10.55 10.32 10.09 9.88 9.67 9.47 9.29 9.10 8.92

Temperature ()
22 23 24 25 26 27 28 29 30 31 32

Dissolved oxygen (mg/L)
8.77 8.58 8.42 8.26 8.11 7.97 7.83 7.69 7.55 7.41 7.29

Temperature ()
33 34 35 36 37 38 39 40 41 42 43

Dissolved oxygen (mg/L)
7.17 7.06 6.94 6.83 6.72 6.61 6.51 6.41 6.31 6.21 6.12

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5. Contact information
Shandong Renke Control Technology Co., Ltd. Marketing Center:10th Floor, East Block, No.8 buildings, Shuntai Plaza, High-tech Zone, Jinan City, Shandong Province, China Post code:250101 Phone:400-085-5807 Fax:(86)0531-67805165 Website:www.renkeer.com Cloud platform address: en.0531yun.com

6. Document history
V1.0 Document establishment V1.1 Model modification V1.2 Add calibration frequency to precautions and maintenance V2.0 Product update

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References

• Environmental Monitoring Platform
• Weather sensors, Industrial temperature and humidity sensors, Best gas sensors manufacturer

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