MS-0401-01A

**Modbus pH Sensor Adapter Datasheet Version 1.0** 

Document Reference No.: BRT_000493    Clearance No.: BRT#257 

## **Modbus pH Sensor Adapter Datasheet** 

## **1 Introduction** 

## **1.1 Features** 

The Modbus pH Sensor Adapter is designed to work with pH probes to form a complete pH sensor. The adapter consists of a built-in BNC connector used to attach pH probes. The adapter and probe are calibrated using a 2-point calibration algorithm and supports measurement of pH ranging from 0 to 14 pH with a 0.01 pH resolution. The adapter and probe combination are suitable for use in applications such as nutrient tanks, water treatment plants, sewage treatment plants, swimming pools. Real time monitoring, alert notifications and control automation can be achieved. 

- pH Sensor Adapter to integrate with any pH probe with a BNC connector 

- Measures pH range of 0 to 14pH with linearized output and 0.01 pH resolution 

- 2 Point calibration guided step-by-step 

- Implements Modbus RTU protocol 

- High report rate of 1 report every 5 seconds 

- Low power consumption 5V-108mW 

- Operating temperature range: 0[o] C to +70[o] 

- Flush mount and DIN Rail Mount options 

Neither the whole nor any part of the information contained in, or the product described in this manual, may be adapted, or reproduced in any material or electronic form without the prior written consent of the copyright holder. This product and its documentation are supplied on an as-is basis and no warranty as to their suitability for any particular purpose is either made or implied. Bridgetek Pte Ltd will not accept any claim for damages howsoever arising as a result of use or failure of this product. Your statutory rights are not affected. This product or any variant of it is not intended for use in any medical appliance, device, or system in which the failure of the product might reasonably be expected to result in personal injury. This document provides preliminary information that may be subject to change without notice. No freedom to use patents or other intellectual property rights is implied by the publication of this document. Bridgetek Pte Ltd, 1 Tai Seng Avenue, Tower A, #03-05, Singapore 536464. Singapore Registered Company Number: 201542387H 

Copyright © Bridgetek Pte Ltd 

1 

**Modbus pH Sensor Adapter Datasheet Version 1.0** 

Document Reference No.: BRT_000493    Clearance No.: BRT#257 

## **2 Part Numbers / Ordering Information** 

|**Part Number**|**Description**|
|---|---|
|MS-0401-01A|ModbuspH Sensor Adapter|
|MA-0102-01A|Modbus RS485-RJ11 Cable(30cm)|
|LA-1201-01A|LDSBus DIN Rail Mount Set|



**Table 1 - Part Numbers / Ordering Information** 

Copyright © Bridgetek Pte Ltd 

2 

**Modbus pH Sensor Adapter Datasheet Version 1.0** 

Document Reference No.: BRT_000493    Clearance No.: BRT#257 

**==> picture [451 x 612] intentionally omitted <==**

**----- Start of picture text -----**<br>
|||
|---|---|
|Table of Contents|
|1|Introduction .............................................................. 1|
|1.1|Features .............................................................................. 1|
|2|Part Numbers / Ordering Information ....................... 2|
|3|Specifications ............................................................ 4|
|4|FCC Compliance Statement ........................................ 5|
|5|Hardware Features .................................................... 6|
|6|Sensor Adapter Configuration and Installation .......... 8|
|6.1|Connection Diagram ............................................................ 8|
|6.2|RS485-RJ11 Cable(30cm) ................................................... 9|
|7|Mounting Instructions ............................................. 10|
|7.1|Flush Mount ....................................................................... 10|
|7.2|DIN Rail Mount .................................................................. 10|
|8|Modbus Registers .................................................... 11|
|9|Mechanical Dimensions ........................................... 12|
|10|System Status LED Indicators.................................. 13|
|11|Probe Selection ....................................................... 14|
|12|Contact Information ................................................ 15|
|Appendix A – References ............................................. 16|
|Document References ............................................................... 16|
|Acronyms and Abbreviations ..................................................... 16|
|Appendix B – List of Figures and Tables ....................... 17|
|List of Figures ........................................................................... 17|
|List of Tables ............................................................................. 17|
|Appendix C – Revision History ..................................... 18|

**----- End of picture text -----**<br>


Copyright © Bridgetek Pte Ltd 

3 

**Modbus pH Sensor Adapter Datasheet Version 1.0** 

Document Reference No.: BRT_000493    Clearance No.: BRT#257 

## **3 Specifications** 

|**Features**<br>~~oo~~|Interface|BNC - Connect to pH probe<br>RS485 Modbus RTU|
|---|---|---|
||LED Indicator (RGB)|System Status Indicator (Please refer to<br>LED section)|
||Mounting<br>|Flush Mount|
|||DIN Rail Mount<br>~~Ps~~<br>|
|**Power**<br>~~oo~~<br>~~a~~|Modbus Voltage<br>|9-24V DC Bus Power<br>~~Ps~~<br>|
||Device Input Voltage<br>~~es~~|5V DC Bus Power<br>~~Ps~~<br>~~es~~|
||Typical Power<br><br>~~ns~~|108mW<br>~~Ps~~<br><br>~~ns~~|
||Max. Power<br><br>~~es~~<br>~~SSS~~|218mW<br>~~Ps~~<br><br>~~es~~<br>~~SSS~~|
|**pH Sensor input**<br>**module**<br>~~oo~~<br>~~a~~<br>~~a~~|Range<br><br>~~SSS~~|0 – 14pH<br>~~Ps~~<br><br>~~SSS~~|
||Resolution<br>~~SSS~~<br>~~es~~|0.01pH<br>~~SSS~~<br>~~es~~|
||Response Time<br>~~SSS~~<br>~~nD~~<br>~~a~~|<1Minute<br>~~SSS~~<br>~~nD~~|
||Calibration<br>~~SSS~~<br>~~a~~|2 Point Calibration<br>~~SSS~~|
|**Physical**<br>**Characteristics**<br>~~a ~~<br>~~a~~<br>~~Be~~<br>~~oe~~|Color<br> ~~SSS ~~<br>~~a~~<br>~~Be~~|White<br> ~~SSS~~|
||Housing<br>~~Be~~<br>~~es~~|Polycarbonate<br>~~es~~|
||Dimensions<br>~~Be~~<br>~~nD~~<br>|L117.6mm x W42.9mm x H29.7mm<br>~~nD~~<br>|
|**Environmental**<br>**Limits**<br>~~oe~~<br>~~——_——eeeee~~|OperatingTemperature<br>~~nD~~<br>|0 to 70°C<br>~~nD~~<br>|
||Storage Temperature<br>~~nD~~<br>~~es~~|-20 to 85°C<br>~~nD~~<br>~~es~~|
||Ambient Relative<br>Humidity<br>~~nD~~<br><br>~~——_——eeeee~~|5 to 95% (non-condensing)<br>~~nD~~<br><br>~~——_——eeeee~~|
|**Package Contents**<br>~~oe~~<br>~~——_——eeeee~~<br>~~Pir~~|Device<br>~~nD~~<br><br>~~——_——eeeee~~|1x ModbuspH Sensor Adapter<br>~~nD~~<br><br>~~——_——eeeee~~|
||Wire Assembly<br>~~——_——eeeee~~<br>~~es~~<br>~~Pir~~<br>~~ee~~|1x Modbus RS485-RJ11 Cable(30cm)<br>~~——_——eeeee~~<br>~~es~~<br>~~ee~~|
|**Optional**<br>~~——_——eeeee~~<br>~~Pir~~|MountingAccessories<br>~~——_——eeeee~~<br>~~Pir~~<br>~~ee~~|1x LDSBus DIN Rail Mount set<br>~~——_——eeeee~~<br>~~ee~~|



Copyright © Bridgetek Pte Ltd 

4 

**Modbus pH Sensor Adapter Datasheet Version 1.0** 

Document Reference No.: BRT_000493    Clearance No.: BRT#257 

## **4 FCC Compliance Statement** 

This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: 

(1) These devices may not cause harmful interference, and 

(2) These devices must accept any interference received, including interference that may cause undesired operation. 

**NOTE:** The equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If the equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: 

- Re-orient or relocate the receiving antenna. 

- Increase the separation between the equipment and receiver. 

- Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. 

- 

- Consult the dealer or an experienced radio/TV technician for help. 

To maintain compliance with FCC’s RF exposure guidelines, at least 20cm of separation distance between the device and the user's body must be always maintained. 

## **FCC Radiation Exposure Statement** 

This device complies with FCC radiation exposure limits set forth for an uncontrolled environment and it also complies with Part 15 of the FCC RF Rules. This equipment must be installed and operated in accordance with the instructions provided, and the antenna(s) used for this transmitter must be installed to provide a separation distance of at least 20 cm from all persons and must not be colocated or operating in conjunction with any other antenna or transmitter. End-users and installers must be provided with antenna installation instructions and consider removing the no-collocation statement. 

## **Caution** 

Any changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment. 

Copyright © Bridgetek Pte Ltd 

5 

**Modbus pH Sensor Adapter Datasheet Version 1.0** 

Document Reference No.: BRT_000493    Clearance No.: BRT#257 

## **5 Hardware Features** 

**==> picture [412 x 560] intentionally omitted <==**

**----- Start of picture text -----**<br>
pH Electrode Probe<br>System Status<br>LED Indicator<br>BNC<br>Connector<br>You,<br>RJ12 Port<br>Flush Mount Slot<br>ro<br>Ya<br>So o~<br>DIN Rail Mount<br>**----- End of picture text -----**<br>


**Figure 1 - Modbus pH Sensor Adapter Hardware Features** 

Copyright © Bridgetek Pte Ltd 

6 

**Modbus pH Sensor Adapter Datasheet Version 1.0** 

Document Reference No.: BRT_000493    Clearance No.: BRT#257 

|**Function**|**Labels**|**Description**|
|---|---|---|
|BNC Connector|Probe|Probe Interface|
|pH Electrode Probe -|H Electrode Probe -|Sensing probe|
|System Status LED<br>Indicator|LED|Modbus status LED|
|RJ12 Port|Modbus|Modbus data and power interface port. The physical<br>port is RJ12. The connection interface can be<br>RJ11/RJ12.|



**Table 3 - Modbus pH Sensor Adapter Hardware Features** 

Copyright © Bridgetek Pte Ltd 

7 

**Modbus pH Sensor Adapter Datasheet Version 1.0** 

Document Reference No.: BRT_000493    Clearance No.: BRT#257 

## **6 Sensor Adapter Configuration and Installation** 

Please visit https://brtsys.com/resources to access the Modbus Configuration Utility guide on how to configure the device name, device address and termination settings before using it for your specific application. 

## **6.1 Connection Diagram** 

**==> picture [398 x 181] intentionally omitted <==**

**----- Start of picture text -----**<br>
cceecseee ee eeee Te Modbus Host Controller<br>noeGu Bese<br>aaaaaa<br>£5 3<br>a ~ ~ u u 7 ~ a “ ~ ~ iia<br>m YOR 9 a OR 9 a JOR 9<br>2 io” 2 com 2 im<br>co o cso a Ssa ®<br>Modbus Modbus Modbus Sensors<br>Devi . . Actuators<br>evice Device Device Controllers<br>Figure 2 - Modbus pH Sensor Adapter Connection Diagram<br>**----- End of picture text -----**<br>


## **Setup Instructions:** 

1. Use a Cat5e/Cat6e RJ45 Twisted Pair Cable to connect the Modbus controller (Host) to the network for RS485 communication and power. 

2. Connect each Modbus device to the network using either an RS485-JST cable or an RS485-RJ11 cable, as provided with the device. 

3. Modbus devices have built-in bus termination resistors. These resistors can be enabled or disabled by using the Modbus Configuration Utility. When installing the device as the last device on the bus, these terminations may be used to terminate the bus. 

Copyright © Bridgetek Pte Ltd 

8 

**Modbus pH Sensor Adapter Datasheet Version 1.0** 

Document Reference No.: BRT_000493    Clearance No.: BRT#257 

## **6.2 RS485-RJ11 Cable(30cm)** 

## **Figure 3 - RS485-RJ11 Cable(30cm)** 

|**PIN Legend**|**Function**|
|---|---|
|VIN|Modbus Input Voltage 9-24VDC|
|GND|Ground|
|GND|Ground|
|B|RS485-B|
|A|RS485-A|



**Table 4 - RS485-RJ11 Cable(30cm) Pin Configuration** 

Copyright © Bridgetek Pte Ltd 

9 

**Modbus pH Sensor Adapter Datasheet Version 1.0** Document Reference No.: BRT_000493    Clearance No.: BRT#257 

## **7 Mounting Instructions** 

## **7.1 Flush Mount** 

The device can be flush mounted directly on a wall or any flat surface using 2 M3.5*16mm (thread) screws. 

**==> picture [60 x 9] intentionally omitted <==**

**----- Start of picture text -----**<br>
2xM3.5*16mm<br>**----- End of picture text -----**<br>


**Figure 4 - Modbus pH Sensor Adapter Flush Mount** 

## **7.2 DIN Rail Mount** 

The device can be mounted on a DIN Rail using the LDSBus DIN Rail Mount set. This set is optional and includes the bracket and mounting screws. 

**==> picture [67 x 8] intentionally omitted <==**

**----- Start of picture text -----**<br>
DIN Rail Mount<br>**----- End of picture text -----**<br>


**Figure 5 - Modbus pH Sensor Adapter DIN Rail Mount** 

Copyright © Bridgetek Pte Ltd 

10 

**Modbus pH Sensor Adapter Datasheet Version 1.0** 

Document Reference No.: BRT_000493    Clearance No.: BRT#257 

## **8 Modbus Registers** 

|**Parameter**|**Starting**<br>**Address**|**Quantity**<br>**of**<br>**Registers**|**Supported**<br>**Function**<br>**Code**|**Parameter Range**<br>**and Description**|**Default**|
|---|---|---|---|---|---|
|**Address(1)**<br>~~OO~~|0000H<br>~~OO~~|1<br>~~OO~~|0x03/0x10<br>~~OO~~|1 to 126<br>~~OO~~|126<br>~~OO~~|
|**RS485 Termination(1)**|0001H|1|0x03/0x10|0 - Termination OFF<br>1-Termination ON|Termination OFF|
|**Baud Rate(1)**|0002H|1|0x03/0x10|0 - 1200 bps<br>1 - 2400 bps<br>2 - 4800 bps<br>3 - 9600 bps<br>4 -19200 bps<br>5 - 38400 bps<br>6-115200 bps|9600 bps|
|**Parity(1)**|0003H|1|0x03/0x10|0 – None<br>1 – Odd<br>2-Even|Even|
|**Status LED Enable(1)**|0004H|1|0x03/0x10|0 - LED OFF<br>1-LED ON|LED ON|
|**Measuring**<br>**Temperature**|0005H|1|0x03/0x10|0 – 70°C|25°C|
|**Sensor Calibration**<br>**Version**|0006H|1|0x03/0x10|Calibration version<br>0x0090 - Calibrated<br>0xFFFF - Not<br>calibrated|N/A|
|**Sensor Calibrated**<br>**Date**|0007H|2|0x03/0x10|Calibration date<br>YYYYMMDD<br>0x20221203|N/A|
|**Sensor Calibrated**<br>**Constant**|0009H|1|0x03/0x10|Constant value =<br>0x000A|0xFFFF|
|**Sensor Calibrated pH**<br>**ADC Value**|000AH|1|0x03/0x10|0 to 1023|N/A|
|**Sensor Calibrated**<br>**Gain**|000BH|1|0x03/0x10|Gain x 1024|0x0939|
|**Sensor Calibrated**<br>**Offset**|000CH|2|0x03/0x10|Offset value x 1024|0x00000000|
|**Sensor Calibrated**<br>**Temperature**|000EH|1|0x03/0x10|Temperature<br>0–70°C|25°C|
|**Calibration XOR**<br>**Checksum**|000FH|1|0x03/0x10|XOR Checksum<br>registers 06H to<br>0EH|N/A|
|**Device UUID**|0026H|8|0x03|MSxxxxxxxxxxxxyy<br>where x is ASCII<br>character and yy is<br>16-bit running<br>number|N/A|
|**Device Firmware**<br>**Version**|002EH|1|0x03|0xXXMN<br>XX – Not concerned<br>M – Major<br>N-Minor|N/A|
|**Device Part Number**<br>~~a~~|002FH|1|0x03|Device ID|0x8008|
|**Reserved**<br>~~OO~~|0030H<br>~~OO~~|N/A<br>~~OO~~|N/A<br>~~OO~~|Reserved<br>~~OO~~|N/A<br>~~OO~~|
|**pH**<br>~~a ~~|0031H<br> ~~eG~~|1<br>~~eG~~|0x03<br>~~eG~~|0-14 pH x 100<br>~~eG~~|N/A<br>~~eG~~|
|**Sensor ADC data**<br>~~I~~|0032H<br>~~I~~|1<br>~~I~~|0x03<br>~~I~~|0-1023<br>~~I~~|N/A<br>~~I~~|
|**Reset**<br>~~OO~~|0150H<br>~~OO~~|1<br>~~OO~~|0x06<br>~~OO~~|Write 1 to reset<br>~~OO~~|N/A<br>~~OO~~|
|**Reserved**<br>~~I~~|0151H<br>~~I~~|N/A<br>~~I~~|N/A<br>~~I~~|Reserved<br>~~I~~|N/A<br>~~I~~|
|**Identify**|0152H|1|0x06|Write 1 to start<br>blinking the device<br>@1Hz for 10<br>seconds|N/A|



**Table 5 - Modbus Registers** 

> **(1)** This indicates that any updates to these communication/status register(s) will only take effect after the device has been rebooted. 

Copyright © Bridgetek Pte Ltd 

11 

**Modbus pH Sensor Adapter Datasheet Version 1.0** 

Document Reference No.: BRT_000493    Clearance No.: BRT#257 

## **9 Mechanical Dimensions** 

**Figure 6 - Modbus pH Sensor Adapter Dimension – Top View** 

**==> picture [19 x 6] intentionally omitted <==**

**----- Start of picture text -----**<br>
29.7<br>**----- End of picture text -----**<br>


**Figure 7 - Modbus pH Sensor Adapter Dimension – Side View** 

**Figure 8 - Modbus pH Sensor Adapter Dimension – Bottom View** 

**Note:** All dimensions are in millimetres. 

Copyright © Bridgetek Pte Ltd 

12 

**Modbus pH Sensor Adapter Datasheet Version 1.0** 

Document Reference No.: BRT_000493    Clearance No.: BRT#257 

## **10 System Status LED Indicators** 

|**Device Status**|**LED Color**|**LED Color**|**Flashing Frequency**|**Description**|
|---|---|---|---|---|
|Termination ON|BLUE||Steady – Non- flashing||
|Termination OFF|GREEN||Steady – Non- flashing||
|Device<br>Configuration Error|RED||Steady – Non- flashing|Device configuration<br>error|
|Communication|RED/GREEN/<br>BLUE/YELLOW|**-**|Blink twice (Short blink)|Device in<br>communication|
|Firmware update|YELLOW||Steady – Non- flashing|Device firmware<br>update|



**Table 6 - System Status LED Indicators** 

## **Note:** 

1. For reliable communication, ensure that the power supply and the RS485 termination settings are correct. 

2. Ensure that the Modbus address and baud rate are configured correctly before deployment. 

Copyright © Bridgetek Pte Ltd 

13 

**Modbus pH Sensor Adapter Datasheet Version 1.0** 

Document Reference No.: BRT_000493    Clearance No.: BRT#257 

## **11 Probe Selection** 

The following specifications are recommended for selecting a Probe - 

pH Range : 0~14pH Connector Interface : BNC Zero Point : Max. 7±0.5pH Theoretical slope % : ≥90% and ≤105% Internal Resistance : ≤250MὨ 

For more information on calibration, please refer to Modbus Configuration Utility User Guide 

For information related to probes recommendation and selection criteria, please refer to LDSBus Probe Specifications. 

Copyright © Bridgetek Pte Ltd 

14 

**Modbus pH Sensor Adapter Datasheet Version 1.0** 

Document Reference No.: BRT_000493    Clearance No.: BRT#257 

## **12 Contact Information** 

Refer to https://brtchip.com/contact-us/ for contact information. 

## **Distributor and Sales Representatives** 

Please visit the Distribution Network – IC & Module (brtchip.com) page for the contact details of our distributor(s) and sales representative(s) in your country. 

System and equipment manufacturers and designers are responsible to ensure that their systems, and any Bridgetek Pte Ltd (BRTChip) devices incorporated in their systems, meet all applicable safety, regulatory and system-level performance requirements. All application-related information in this document (including application descriptions, suggested Bridgetek devices and other materials) is provided for reference only. While Bridgetek has taken care to assure it is accurate, this information is subject to customer confirmation, and Bridgetek disclaims all liability for system designs and for any applications assistance provided by Bridgetek. Use of Bridgetek devices in life support and/or safety applications is entirely at the user’s risk, and the user agrees to defend, indemnify and hold harmless Bridgetek from any and all damages, claims, suits, or expense resulting from such use. This document is subject to change without notice. No freedom to use patents or other intellectual property rights is implied by the publication of this document. Neither the whole nor any part of the information contained in, or the product described in this document, may be adapted, or reproduced in any material or electronic form without the prior written consent of the copyright holder. Bridgetek Pte Ltd, 1 Tai Seng Avenue, Tower A, #03-05, Singapore 536464. Singapore Registered Company Number: 201542387H. 

Copyright © Bridgetek Pte Ltd 

15 

**Modbus pH Sensor Adapter Datasheet Version 1.0** 

Document Reference No.: BRT_000493    Clearance No.: BRT#257 

## **Appendix A – References** 

## **Document References** 

Modbus Configuration Utility User Guide 

LDSBus Probe Specifications 

## **Acronyms and Abbreviations** 

|**Terms**|**Description**|
|---|---|
|DC|Direct Current|
|IoT|Internet of Things|
|LED|Light Emitting Diode|



Copyright © Bridgetek Pte Ltd 

16 

**Modbus pH Sensor Adapter Datasheet Version 1.0** 

Document Reference No.: BRT_000493    Clearance No.: BRT#257 

## **Appendix B – List of Figures and Tables** 

## **List of Figures** 

|Figure 1 - Modbus pH Sensor Adapter Hardware Features ........................................................ 6|Figure 1 - Modbus pH Sensor Adapter Hardware Features ........................................................ 6|Figure 1 - Modbus pH Sensor Adapter Hardware Features ........................................................ 6|
|---|---|---|
|Figure 2 - Modbus pH Sensor Adapter Connection Diagram ...................................................... 8|Figure 2 - Modbus pH Sensor Adapter Connection Diagram ...................................................... 8|Figure 2 - Modbus pH Sensor Adapter Connection Diagram ...................................................... 8|
|Figure 3 - RS485-RJ11 Cable(30cm) ...................................................................................... 9|Figure 3 - RS485-RJ11 Cable(30cm) ...................................................................................... 9|Figure 3 - RS485-RJ11 Cable(30cm) ...................................................................................... 9|
|Figure 4 - Modbus pH Sensor Adapter Flush Mount ................................................................ 10|Figure 4 - Modbus pH Sensor Adapter Flush Mount ................................................................ 10|Figure 4 - Modbus pH Sensor Adapter Flush Mount ................................................................ 10|
|Figure 5 - Modbus pH Sensor Adapter DIN Rail Mount............................................................ 10|Figure 5 - Modbus pH Sensor Adapter DIN Rail Mount............................................................ 10|Figure 5 - Modbus pH Sensor Adapter DIN Rail Mount............................................................ 10|
|Figure 6 - Modbus pH Sensor Adapter Dimension – Top View.................................................. 12|Figure 6 - Modbus pH Sensor Adapter Dimension – Top View.................................................. 12|Figure 6 - Modbus pH Sensor Adapter Dimension – Top View.................................................. 12|
|Figure 7 - Modbus pH Sensor Adapter Dimension – Side View ................................................. 12|Figure 7 - Modbus pH Sensor Adapter Dimension – Side View ................................................. 12|Figure 7 - Modbus pH Sensor Adapter Dimension – Side View ................................................. 12|
|Figure 8 - Modbus pH Sensor Adapter Dimension – Bottom View ............................................ 12|Figure 8 - Modbus pH Sensor Adapter Dimension – Bottom View ............................................ 12|Figure 8 - Modbus pH Sensor Adapter Dimension – Bottom View ............................................ 12|



## **List of Tables** 

|Table 1 - Part Numbers / Ordering Information ....................................................................... 2|Table 1 - Part Numbers / Ordering Information ....................................................................... 2|Table 1 - Part Numbers / Ordering Information ....................................................................... 2|
|---|---|---|
|Table 2 - Modbus pH Sensor Adapter Specifications ................................................................. 4|Table 2 - Modbus pH Sensor Adapter Specifications ................................................................. 4|Table 2 - Modbus pH Sensor Adapter Specifications ................................................................. 4|
|Table 3 - Modbus pH Sensor Adapter Hardware Features ......................................................... 7|Table 3 - Modbus pH Sensor Adapter Hardware Features ......................................................... 7|Table 3 - Modbus pH Sensor Adapter Hardware Features ......................................................... 7|
|Table 4 - RS485-RJ11 Cable(30cm) Pin Configuration .............................................................. 9|Table 4 - RS485-RJ11 Cable(30cm) Pin Configuration .............................................................. 9|Table 4 - RS485-RJ11 Cable(30cm) Pin Configuration .............................................................. 9|
|Table 5 - Modbus Registers ................................................................................................ 11|Table 5 - Modbus Registers ................................................................................................ 11|Table 5 - Modbus Registers ................................................................................................ 11|
|Table 6 - System Status LED Indicators ............................................................................... 13|Table 6 - System Status LED Indicators ............................................................................... 13|Table 6 - System Status LED Indicators ............................................................................... 13|



Copyright © Bridgetek Pte Ltd 

17 

**Modbus pH Sensor Adapter Datasheet Version 1.0** 

Document Reference No.: BRT_000493    Clearance No.: BRT#257 

## **Appendix C – Revision History** 

Document Title: Modbus pH Sensor Adapter Datasheet 

Document Reference No.: BRT_000493 Clearance No.: BRT#257 Product Page: https://brtchip.com/product/modbus-ph-sensor-adapter/ 

Document Feedback: Send Feedback 

|**Revision**|**Changes**|**Date**|
|---|---|---|
|Version 1.0|Initial release under Bridgetek|13-10-2025|



Copyright © Bridgetek Pte Ltd 

18