View source for RS-485 Turbidity Probe AT-SB-PROBE-T-P

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[[File:Turbidity Datasheet.png|center|frameless|321x321px]]

== Datasheet ==

=== 1. Introduction ===
SENSBLUE RS-485 Turbidity Probe AT-SB-PROBE-T-P is used in environmental water quality monitoring, acid/alkali/salt solutions, chemical reaction processes, and industrial production processes. It can meet the requirements of online pH measurement for most industrial applications.

=== 2. Features ===

* 90° angle scattered light principle, built-in temperature sensor
* Support RS-485, Modbus/RTU protocol
* Optical fiber structure, strong resistance to external light interference
* Infrared LED light source with high stability
* IP68 protection, water depth within 20 meters
* Convenient, fast, stable and easy to maintain

=== 3. Technical Specifications ===
{| class="wikitable tech-table"
!'''Model'''
! colspan="2" |'''KWS-960''' 
|-
|Measuring  Range
| colspan="2" |Turbidity  PPR AT-SB-PROBE-T-P
|-
|Principle
| colspan="2" |Light  scattering method
|-
| rowspan="3" |Range/Resolution
|0～20.00NTU
|0.01NTU/0.1℃
|-
|0～200.0NTU
|0.01NTU/0.1℃
|-
|0～1000.0NTU
|0.1NTU/0.1℃
|-
|Precision
| colspan="2" |±3%  or ±1.5NTU(0～20.00NTU)<br>±3%  or ±2NTU(0～200.0NTU)<br>±5%  or ±3NTU(0～1000.0NTU)
|-
|Response Time (T90)
| colspan="2" |＜60s
|-
| rowspan="2" |Lowest  Detection Limit
| colspan="2" |0.01 (0-20NTU)
|-
| colspan="2" |0.3NTU
|-
|Calibration Mode
| colspan="2" |Two-point  calibration
|-
|Temperature Compensation
| colspan="2" |Automatic  temperature compensation (Pt1000)
|-
|Output
| colspan="2" |RS-485  (Modbus/RTU)
|-
|Working Conditions
| colspan="2" |0～50℃，<0.2MPa
|-
|Storage Temperature
| colspan="2" |-  5 ～ 65 ℃
|-
|Installation
| colspan="2" |Immersion  mount with 3/4NPT pipe thread
|-
|Cable Length
| colspan="2" |5  meters, other lengths can be customized
|-
|Power Consumption
| colspan="2" |0.2W@12V
|-
|Power Supply
| colspan="2" |12～24VDC
|-
|Protection Grade
| colspan="2" |IP68
|}

=== 4. Dimensions ===
[[File:Turbidity Dimensions.svg|center|frameless|540x540px]]
'''''Note: The sensor joint is M16-5 core waterproof joint male head''''' 

=== 5. Installation and Pinouts ===

==== 5.1 Installation ====
Installation distance requirements: keep above 5cm with side wall and above 10cm with bottom.
[[File:ProbesWiring.svg|center|frameless|812x812px]]
{| class="wikitable tech-table"
! colspan="2" |'''Pinouts'''
|-
|1  - Pin 12-24V DC
|4  - RS485 B-
|-
|2  - GND
|5  – NA
|-
|3  - RS485 A+
|6  - NA
|-
| colspan="2" |7 - NA
|}

=== 6. Maintenance ===

==== 6.1 Use and maintenance ====
'''a) Maintenance schedule'''

The cleanliness of the measuring window is very important for maintaining accurate readings.
{| class="wikitable mix-table"
!'''Maintenance task'''
!'''Recommended maintenance frequency'''
|-
|Calibrate  sensors

(if  required, by the competent authority)
|According to the maintenance schedule  required by the competent department
|}
'''b) Maintenance method'''

* Sensor outer surface: Clean the outer surface of the sensor with tap water. If debris remains, wipe it with a soft, wet cloth. For stubborn dirt, you can add some household detergent to the tap water, but rinse thoroughly with clean water afterwards.
* Check the cable of the sensor: The cable should not be tightened while the sensor is operating, as this may cause the internal wires to break and prevent the sensor from functioning properly.
* Check the sensor’s measurement window to see if there is any dirt. Use a normal cleaning brush if there is some.

'''c) Matters that require attention'''

* The probe contains sensitive optical and electronic components. Make sure the probe is not subjected to severe mechanical impact. There are no components inside the probe that need to be maintained by the user; open it only when specifically instructed by ATRONIA, as opening it may damage the internal components.

'''d) Sensor’s Calibration'''

* Zero calibration: Take an appropriate amount of zero‑turbidity solution in a large beaker. Place the sensor vertically in the solution, ensuring that the front end of the sensor is at least 10 cm from the bottom of the beaker. Perform the zero calibration after the reading has stabilized for 3 minutes. For instructions, refer to the appendix.
* Slope calibration: Place the sensor probe in the standard solution, ensuring that the front end of the sensor is at least 10 cm from the bottom of the beaker. Perform the slope calibration after the reading has stabilized for 3 to 5 minutes. For instructions, refer to the appendix.

==== 6.2 Frequently Asked Questions ====
{| class="wikitable mix-table"
!'''Problem'''
!'''Probable cause'''
!'''Solution'''
|-
| rowspan="2" |The  operating interface cannot connect or does not display the measurement  results
|The measured value is too

high, too low, or the numerical value  remains unstable.
|Reconnect the controller and cable
|-
|Cable  failure
|Please contact us.
|-
|The  measured value is too

high,  too low, or the numerical value remains unstable.
|The sensor window is attached to the  external object
|Clean the window surface of the sensor
|}

=== 7. Appendix data communication ===

==== 7.1 Data Format ====
The default data format for Modbus communication is: 9600, n, 8, 1 (baud rate 9600bps, 1 start bit, 8 data bits, no parity, 1 stop bit).

==== 7.2 Information Frame  Format ====
(xx for one byte).

a) Read data instruction frame

07                         03                       xx  xx                         xx   xx                    xx  xx            

Address   Function code   Register start address   Number of registers   CRC check code (low byte first)

b) Read data response frame

07                         03                       xx  xx                         xx   xx                   xx  xx

Address    Function code             Bytes                   Response data     CRC check code (low byte first)

c) Wriite data instruction frame

07                         06                       xx  xx                         xx   xx                    xx  xx            

Address   Function code   Register address          Read-in data       CRC check code (low byte first)

d) Write data response frame (same data command frame)

07                         06                       xx  xx                          xx   xx                   xx  xx

Address    Function code    Register ddress            Read-in data     CRC check code (low byte first)

==== 7.3 Register address ====
{| class="wikitable tech-table"
!'''Register address'''
!'''Designation'''
!'''Explain'''
!'''Number of registers'''
!'''Access mode'''
|-
|40001  (0x0000)
|Measured value + temperature
|4 double-byte integers, namely, the  measured value, the number of decimal places of the measured value, the  temperature value, and the number of decimal places of the temperature value.
|4 (8 bytes)
|Read
|-
|44097

(0x1000))
|Zero calibration
|The 0-20NTU range is calibrated in  0-10NTU turbidity solution, and the written data is the actual value of the  standard solution × 100; the 0-100NTU range is calibrated in 0-20NTU  turbidity solution, and the written data is the actual value of the standard  solution × 10; the 0-1000NTU range is calibrated in 0-200NTU turbidity  solution, and the written data is the actual value of the standard solution ×  10; the read data is the zero-point offset.
|1(2 bytes)
|Write/Read
|-
|44101

(0x1004)
|Slope calibration
|The 0-20NTU range is calibrated in  10-20NTU turbidity solution, and the written data is the actual value of the  standard solution × 100; the 0-100NTU range is calibrated in 20-100NTU  turbidity solution, and the written data is the actual value of the standard  solution × 10; the 0-1000NTU range is calibrated in 200-1000NTU turbidity  solution, and the written data is the actual value of the standard solution ×  10; the read data is the slope value × 1000.
|1(2 bytes)
|Write/Read
|-
|44113

(0x1010)
|temperature correction
|When calibrated 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
|-
|48195

(0x2002)
|Sensor

address
|The default is 7, and the write data  range is 1-255.
|1(2 bytes)
|Write/Read
|-
|48196

(0x2003)
|Baud rate
|Default is 9600. 0-9600, 1-19200.
|1(2 bytes)
|Write/  Read
|-
|48225

(0x2020)
|Reset sensor
|The calibration value is restored to  the default value, and the written data is 0. Note that the sensor needs to  be calibrated again after being reset before it can be used.
|1 (2 bytes)
|Write
|}

==== 7.4 Command example ====
'''a) Start measurement instructions'''

  Function: Obtain the turbidity value and temperature of the measuring probe; the unit of temperature is Celsius, and the unit of turbidity is NTU.

Request frame: 07 03 00 00 00 04 44 6F

Response frame: 07 03 08 01 02 00 01 00 B0 00 01 94 B4

Example of reading:
{| class="wikitable mix-table"
!'''Turbidity value'''
!'''Temperature scale'''
|-
|01  02 00 01
|00  B0 00 01
|}
For example: turbidity value 01 02 means hexadecimal reading turbidity value, 00 01 means turbidity

value with 1 decimal point, converted to decimal value 25.8.

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

represents the temperature value with a decimal point converted to a decimal value of 17.6.

'''b) Calibration instructions'''

'''Zero calibration'''

Function: Set the zero-calibration value of the turbidity of the sensor; here the zero calibration is

performed in zero turbidity water;

Request frame: 07 06 10 00 00 00 8C 6E

Response frame: 07 06 10 00 00 00 8C 6E

'''Slope calibration'''

Function: Set the slope calibration value of the sensor turbidity.

For sensor with a range of 0 to 1000 NTU and 0 to 100 NTU, the slope calibration example is as

follows (calibrated in 1000 NTU standard solution, the written value is 1000x10, i.e. 0x2710):

Request frame: 07 06 10 04 27 10 D6 91

Response frame: 07 06 10 04 27 10 D6 91

For sensor with a range of 0 to 20 NTU, the slope calibration example is as follows (calibrated in

20 NTU standard solution, the written value is 20x100, i.e. 0x07D0):

Request frame: 07 06 10 04 07 D0 CF 01

Response frame: 07 06 10 04 07 D0 CF 01

'''c) Set the device ID address:'''

Role: set the MODBUS device address of the electrode;

Change the device address 06 to 01. The example is as follows

Request frame: 07 06 20 02 00 01 E2 6C

Response frame: 07 06 20 02 00 01 E3 6C

==== 7.5 Error response ====
'''''If the sensor does not execute the upper computer command correctly, the following format information is returned:'''''
{| class="wikitable tech-table"
!'''Definition'''
!'''Address'''
!'''Function Code'''
!'''CODE'''
!'''CRC check'''
|-
|data
|ADDR
|COM+80H
|xx
|CRC  16
|-
|Number of  bytes
|1
|1
|1
|2
|}
a) CODE: 01 – Functional code error

                  03 – Data error

b) COM：Received function code

=== 8. Applicable Accessories ===
{| class="wikitable"
|
|'''Name'''
|'''Requirements'''
|-
|PA000000076
|SENSBLUE  MONARCH Solar Panel 1 Probe
|
|-
|PA000000079
|SENSBLUE  MONARCH Solar Panel 2 Probes
|
|-
|PA000000080
|SENSBLUE  MONARCH Solar Panel 1 Probe External Antenna
|
|-
|PA000000074
|SENSBLUE  MONARCH Solar Panel 2 Probes External Antenna
|
|-
|PA000000081
|SENSBLUE  MONARCH Opaque Case 1 Probe
|
|-
|PA000000082
|SENSBLUE  MONARCH Opaque Case 2 Probes
|
|-
|PA000000083
|SENSBLUE  MONARCH Opaque Case 1 Probe External Antenna
|
|-
|PA000000084
|SENSBLUE  MONARCH Opaque Case 2 Probes External Antenna
|
|-
|PA000000020
|SENSBLUE  MONARCH RS485 Probe Splitter Box (1 input -> 2 outputs)
|
|}

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|'''Requirements'''
|-
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'''10. Applicable certifications and standards'''

  EMC Directive 2014/30/EU.

* '''EN IEC 61326-1: 2021'''
* '''EN 55011: 2016+A2: 2021'''
* '''EN IEC 61000-3-2: 2019+A1: 2021'''
* '''EN 61000-3-3: 2013+A2: 2021'''