JXCT JXBS-3001-PH-RS - User Manual

Need help?

Do you have a question about the JXCT JXBS-3001-PH-RS and is the answer not in the manual?

Summary

Product Introduction

General Info

Transmitter for pH monitoring, suitable for soil. Features isolated power, sensor, and signal outputs for safety and reliability.

Features

Utilizes PH electrode for stable, high-precision measurements with wide range, good linearity, waterproof design, and ease of use.

Main Specs

Lists key technical specifications including power supply, accuracy, measurement range, stability, output type, operating temperature, and response time.

System Framework

Describes connection methods for single and multiple sensors to PLC, MCU, or PC for configuration and testing via RS485 interface.

Hardware Connection

Check before installation

Lists the contents of the product package, including the sensor, optional accessories, and warranty information.

Port Description

Details power input (12-24V) and RS485 communication (A/B) port connections, including cable colors and crucial wiring precautions.

Installation

Provides essential installation precautions, advising against heat sources and direct sunlight for accurate measurements.

Configuration Software Installation

485 output mode sensor

Introduces the provided sensor monitoring software for easily reading and modifying sensor parameters like device ID and address.

Sensor connected to computer

Guides on connecting the sensor via USB to 485 and identifying the correct COM port in the computer's Device Manager.

Use of sensor monitoring software

Explains the initial steps for using the software, including selecting sensor type and connecting the device for real-time data.

Modify Baud Rate & Device Address

Guides on changing the sensor's baud rate and slave station number using the software, requiring a device restart.

Communication Protocol

Basic Specs

Covers fundamental communication specifications like coding, data bits, parity, stop bits, error calibration, and baud rate options.

Data Frame Format Definition

Defines the Modbus-RTU data frame structure, including inquiry and reply frames with specific byte allocations.

Register Address

Lists register addresses for pH values and device configuration, detailing their content and operation type (read/write).

Communication Protocol Example

Provides practical examples of reading pH values, illustrating inquiry/reply frames and the calculation method for pH.

This document describes the JXBS-3001-PH-RS Soil PH Sensor, a device designed for monitoring pH values in soil. It utilizes the RS485 Modbus communication protocol, offering a reliable and robust solution for various applications requiring soil pH measurement.

Function Description

The JXBS-3001-PH-RS is a soil pH sensor that provides accurate pH value monitoring. It is designed for applications where precise pH measurement in soil is critical. The sensor's input power supply, sensor probe, and signal output are completely isolated, ensuring safe and reliable operation. The device is characterized by its beautiful appearance and convenient installation, making it suitable for a wide range of environments.

The sensor employs a PH electrode probe, which contributes to its stable signal and high precision. It supports the Modbus-RTU communication protocol, allowing for easy integration into existing systems. The device can be used as a standalone unit or as part of a multi-sensor network on a single 485 bus.

Important Technical Specifications

The JXBS-3001-PH-RS sensor comes with a set of key technical specifications that define its performance and operational parameters:

Power Supply Default: 12-24V DC. This wide voltage input range allows for flexible power integration in various setups.
Consumption: ≤0.15W. The low power consumption makes it energy-efficient for continuous operation.
Detect Accuracy: ±0.3pH. This specification indicates the precision of the pH measurements.
PH Detect Range: 3-9pH. The sensor is capable of measuring pH values within this specific range, suitable for most soil types.
Long-term Stability: ≤5%/year. This ensures that the sensor maintains its accuracy over extended periods, reducing the need for frequent calibration.
Transmit Output: RS485 Output (Modbus). The use of RS485 Modbus protocol ensures robust and long-distance data transmission.
Working Temperature: 0-55 °C. The sensor is designed to operate effectively within this temperature range.
Response Time: ≤15s. This indicates how quickly the sensor can provide a stable pH reading after a change in conditions.
Coding: 8-bit binary.
Data bit: 8-bit.
Parity bit: None.
Stop bit: 1-bit.
Error calibration: CRC Long cyclic code. This ensures data integrity during transmission.
Baud rate: 2400bps/4800bps/9600bps Optional. Customizable, with a default of 9600bps.

The Modbus-RTU communication protocol uses a specific data frame format:

Time for initial structure ≥ 4 bytes
Address code = 1 byte
Function code = 1 byte
Data area = N bytes
Error check = 16-bit CRC code
Time to end structure ≥ 4 bytes

The device uses function code 0x06 to read register data. The data area specifies the unique address in the communication network (factory default 0x01).

Usage Features

The JXBS-3001-PH-RS sensor offers several features that enhance its usability and integration into various systems:

Wide Measurement Range: The sensor's 3-9pH detection range covers the typical pH values found in soil, making it versatile for different agricultural and environmental monitoring applications.
Good Linearity: This ensures that the sensor's output signal is directly proportional to the actual pH value, leading to more accurate readings across its range.
Good Waterproof Performance: The robust design makes it suitable for outdoor and harsh environmental conditions where exposure to moisture is common.
Easy to Use and Install: The sensor is designed for straightforward deployment, reducing the complexity of setup and operation.
Long Transmission Distance: Leveraging the RS485 Modbus protocol, the sensor can transmit data over considerable distances, which is beneficial for large-scale monitoring projects.
System Framework Flexibility:
- Single Sensor Connection: The sensor can be powered by a 12V DC supply and directly connected to a PLC with a 485 interface or a single-chip microcontroller via a 485 interface chip. A USB to 485 converter can also be used to connect to a computer for configuration and testing with the provided sensor configuration tool.
- Multiple Sensors Connection: Multiple sensors can be combined on a single 485 bus. It is crucial to adhere to the "485 Bus Field Wiring Code" for proper setup. A single bus can theoretically connect more than 16 sensors. For larger networks, a 485 repeater can be used to expand the number of connected devices. The bus can then connect to a PLC or a single-chip microcontroller, or to a computer via USB to 485 for configuration and testing.
Configuration Software: The company provides "sensor monitoring software" that allows users to easily read sensor parameters, modify the device ID, and adjust the sensor's address using a computer. This software simplifies the setup and maintenance process.
Port Description: The device supports a wide voltage power input of 12-24V. When connecting the 485 signal line, it is important to ensure that the A/B lines are not reversed. Additionally, for multiple devices on the bus, their addresses must not conflict. The cable colors are standardized: Brown for Power supply +, Black for Power supply -, Yellow (or Grey) for 485-A, and Blue for 485-B.
Installation Precautions: To ensure accurate measurements, it is recommended to avoid installing the sensor in areas prone to heat transfer or direct temperature differences from the measurement area. Installation in a stable environment, away from direct sunlight, windows, air-conditioning, heating, and other equipment, is advised.

Maintenance Features

While the document doesn't explicitly detail maintenance features, several aspects contribute to the device's ease of maintenance and longevity:

Long-term Stability: The specified long-term stability of ≤5%/year for accuracy reduces the frequency of recalibration or replacement, contributing to lower maintenance efforts.
Robust Design: The "good waterproof performance" suggests a durable construction that can withstand environmental factors, minimizing damage and the need for repairs.
Configuration Software for Diagnostics: The provided sensor monitoring software allows users to read sensor parameters and test the device, which can be used for diagnostic purposes to identify and troubleshoot issues.
Standardized Communication Protocol: The use of RS485 Modbus, a widely adopted industrial communication protocol, means that troubleshooting and integration with other systems are well-documented and supported by a broad range of tools and expertise.
Modular Components: While not explicitly stated, the separation of the sensor probe and signal output, along with isolated power supply, often implies a modular design that could simplify replacement of individual components if needed.
Clear Wiring Instructions: The detailed port description and cable color coding facilitate correct wiring, preventing common installation errors that could lead to device malfunction and subsequent maintenance. The warning against incorrect wiring sequences highlights the importance of proper setup to avoid device damage.
Extendable Wiring: The factory default provides 0.6 meters of wire, but customers can extend it as needed, offering flexibility in installation and potentially simplifying maintenance access points.