SEVEN 3S-RH-I Relative Humidity Ambient Temperature and Pressure Sensor
USER MANUAL
The Relative Humidity, Ambient Temperature, and Pressure Sensor is a professional and intelligent measuring sensor with a digital interface for environmental and industrial applications. It belongs to the SEVEN meteorological sensors range, providing accurate meteorological information.
3S-RH/AT/PS
Relative Humidity, Ambient Temperature and Pressure Sensor
1. Introduction
Relative Humidity, Ambient Temperature and Pressure Sensor is a product from the SEVEN meteorological sensors range of professional and intelligent measuring sensors with digital interface for environmental and industrial applications.
Sensor & Output Types
| 3S-RH/AT/PS | Digital |
| 3S-RH/AT/PS -MB | ModBus – RS485 |
| 3S-RH-I | Analog – 4-20mA |
The version with digital output has SDA, SCL pins which are I2C communication outputs. It is connected to the irradiance sensor box communicating with the I2C communication protocol via these pins. The user can easily connect it to the irradiance box with only a 7-pin connector. In the version with 4-20mA output, data is transferred to data loggers and receiving units capable of analogue measurement. In the version with ModBus output, all measured meteorological data is transferred to data loggers and receiving units via a 2-wire RS485 bus with Modbus RTU protocol.
SEVEN products use reliable and high-quality instruments to provide accurate meteorological information in environmental and industrial applications.
Note: : SEVEN reserves the right to make changes in this entire document without prior notice.
2. Relative Humidity, Ambient Temperature and Pressure Sensor Installation
It is suggested that the system be operated at ground level to make sure that all components are working properly prior to installation. A general diagram of the progress of the installation steps is given below.
2.1. Unpacking and Control
Upon receipt of the product, it must be carefully checked whether the package content is complete. SEVEN Sensor Solutions must be contacted if any of the components are missing, damaged or defective.
Note: : Quantity and content of the received material may be different based on customer confirmed order.
2.2. Site Requirements and Considerations
Each site is different and has its own unique challenges. For this reason, the installation of the product may differ in each site. First of all, it should be decided where the product will be installed. Ambient temperature can be affected by obstructions, shading source and local topography.
Relative Humidity, Ambient Temperature and Pressure Sensor should be placed away from any dark or reflective and heat-absorbing surfaces.
When the Relative Humidity, Ambient Temperature and Pressure Sensor is to be mounted on a rooftop, it should preferably be mounted on the prevailing wind side of the building. It should also be avoided to place the sensor near any heat source such as chimneys or ventilation.
Note: To facilitate the maintenance of the Relative Humidity, Ambient Temperature and Pressure Sensor must be installed in an easily accessible location, especially for rooftop projects.
2.3. Preparation of Materials to be Used in Installation
The materials needed during installation are provided by SEVEN. The user should only prepare the following hand tools and personal protective equipment.
2.4. Installation
3S-RH/AT/PS Relative Humidity, Ambient Temperature and Pressure Sensor installation can be handled in 2 steps. Firstly, the Relative Humidity, Ambient Temperature and Pressure Sensor mounting structure must be installed. Then the sensors must be fixed to the mounting structure. The installation can be easily completed by a qualified electrician by following SEVEN instructions.
2.5. Mounting Structure
Relative Humidity, Ambient Temperature and Pressure Sensor is not requiring any maintenance or changing of spare parts.
Fastener tightness and cable conditions, looking for damage, deterioration, or disconnection of sensors and electrical enclosures, evidence of moisture or vermin in enclosures, loose wiring connections, embrittlement of attachments and other potential problems, should be checked periodically.
According to IEC 61724-1:2021, the monitoring system should be inspected at least annually and preferably at more frequent intervals.
3. Connections
The sensor junction box has waterproof and UV-resistant connectors. All cable colours and their connection names are indicated in the cable connections section. The minimum bending radius of the cables is 5 mm.
The supply voltage for the Relative Humidity, Ambient Temperature and Pressure Sensor is 12 – 30 V DC. Operation with a supply voltage of 24 V is recommended.
The Relative Humidity, Ambient Temperature and Pressure Sensor has an electrically isolated, half-duplex, 2 wire RS485 interface for configuration, communication and the firmware update.
The communication and power cable of Relative Humidity, Ambient Temperature and Pressure Sensor should be always laid separated from AC/DC cables.
Note: The installation and electrical connections of SEVEN sensors should be carried out by a qualified electrician.
4. 3S-RH/AT/PS-MB Configuration and Communication
Once the Relative Humidity, Ambient Temperature and Pressure Sensor(3S-RH/AT/PS-MB) has been installed and connected correctly, the sensor begins autonomously to take measurements.
Attention must be paid to the following points:
Attention must be paid to the following points:
- A measurement request should be made to the Relative Humidity, Ambient Temperature and Pressure Sensor with the 3S CWS Configuration Tool and it should be checked whether it correctly operation in the site.
- If several Modbus Devices are operated on a network, a unique device ID must be assigned to each device.
Follow SEVEN instructions to configure the Relative Humidity, Ambient Temperature and Pressure Sensor on dataloggers
4.1. 3S Configuration Tool
3S-CWS Configuration Tool v3.0 is a software tool for testing communication and adjusting Modbus parameters on the Relative Humidity, Ambient Temperature and Pressure Sensor(3S-RH/AT/PS-MB).
A Windows® PC with a serial bus interface set as a serial COM port, 3S-CWS Configuration Tool v3.0 software, and USB to RS485 Converter are required for configuration and testing purposes.
Follow the instructions in 3S-CWS Configuration Tool User Manual:
https://www.sevensensor.com/files/d/en/3S-CWS_Configuration_Tool_v3.0.pdf
4.2. Modbus RTU Specifications
4.2.1. Supported Bus Protocol
The Relative Humidity, Ambient Temperature and Pressure Sensor is equipped with an RS-485 communication port that supports Modbus RTU commands. The Relative Humidity, Ambient Temperature and Pressure Sensor can be configured to operate in different communication parameters. The table that follows describes each supported bus protocol.
4.2.2. Supported Function Codes
The Relative Humidity, Ambient Temperature and Pressure Sensor supports a specific subset of Modbus RTU commands.
The table that follows lists each supported function code.
Note : All checksums of the Modbus protocol are omitted in this document. These checksums must always be calculated and sent during communication
4.2.2.1. Read Holding Registers (0x03)
Holding Register Map
The 3S-RH/AT/PS-MB holding register map is based on the “SunSpec Alliance” communication standards. There is no valid value for ambient temperature and relative humidity.
4.2.2.2. Read Input Registers (0x04)
Input Register Map
A standard input register map has been created for all SEVEN Modbus devices. The following Modbus data can be read individually or in blocks.
4.2.2.3. Read & Change Parameters (0x46)
Sub Function (0x04): Write Device Address
Note : When the “Write Communication Parameters” command is used, the “Write Device Address” command must also be used before the restart communication command
Communication Parameter Settings
Parameter changes will take effect after restarting of the sensor by power on reset or restarting the communication command.
5. Additional Documents and Software
Please feel free to contact us if you face any difficulties during installation or configuration
| User Manual | This document |
| Datasheet | 3S-RH/AT/PS brochure |
| 3S-CWS Configuration Tool Firmware | Windows® software for testing, firmware updates and configuration of the device Current device firmware |
6. Contact Details
Please feel free to contact us if you face any difficulties during installation or configuration
Phone Number
Sales Team +90 530 889 80 19
Techical Support +90 553 892 26 70
Emails
Sales Team sales@sevensensor.com
Techical Support teknik@sevensensor.com
Website www.sevensensor.com
Specifications
- Product Name: 3S-RH/AT/PS
- Product Type: Relative Humidity, Ambient Temperature, and Pressure Sensor
- Output Types: 3S-RH/AT/PS, 3S-RH/AT/PS-MB, 3S-RH-I
FAQs
Q: Can the sensor be used indoors?
A: While designed for outdoor use, the sensor can be used indoors with proper calibration and placement away from heat sources.
Q: How often should the sensor be calibrated?
A: Calibration frequency depends on usage and environmental conditions. It is recommended to calibrate the sensor annually or as per specific application requirements.
Documents / Resources
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SEVEN 3S-RH-I Relative Humidity Ambient Temperature and Pressure Sensor [pdf] User Manual 3S-RH-AT-PS, 3S-RH-AT-PS-MB, 3S-RH-I, 3S-RH-I Relative Humidity Ambient Temperature and Pressure Sensor, Relative Humidity Ambient Temperature and Pressure Sensor, Ambient Temperature and Pressure Sensor, Temperature and Pressure Sensor, Pressure Sensor |
