SEVEN Sensor Box – 3S-C2
The 3S-C2 is a sensor box that brings together SEVEN meteorological sensors in a single location. It connects module temperature, ambient temperature, relative humidity and pressure, wind speed, and wind direction sensors and transmits all measured data via RS485 using Modbus RTU to data loggers and monitoring systems. The box is designed with plug-and-play functionality for quick field installation. Since each sensor connector has a different number of pins, incorrect connections are impossible.
Technical Specifications of Sensor Box
| Item Code | 3S-C2-AT, 3S-C2-RH |
| Product Type | Sensor box (interface / hub) |
| Connectable Sensors | Module temperature, wind speed and wind direction, ambient temperature, relative humidity and pressure |
| Output Rate | 1/s |
| Data Output | RS485 (up to 38400 baud) |
| Communication Protocol | Modbus RTU |
| Power Supply | 12 – 30 V DC (24 V recommended) |
| Power Consumption | 30 mA max @ 24 V DC |
| Cable Length & Features | 3 m, 24 AWG PUR cable, weather resistant. |
| Galvanic Insulation | 1000 V between the power supply and the RS485 line. |
| Operating Temperature Range | -40°C to +85°C |
| Operating Humidity Range | 0% – 100% RH |
| Dimensions | 110 x 140 x 42 mm (W x D x H) |
| Weight | 0,3 kg |
| IP Class | IP54 (optional IP65, IP68) |
| Housing Material | Aluminum |
| Origin | Türkiye |
What is the purpose of sensor box?
A monitoring site typically contains multiple sensors. Data such as temperature, humidity, and wind are collected separately. The 3S-C2 combines these sensors into a single enclosure and connects them to your data logger via a single Modbus RTU line.
This eliminates the need for separate wiring and input settings for each sensor. On-site installation is simplified, cabling is reduced, and the system is easier to manage. It’s a particularly practical solution for collecting meteorological data from a single point in photovoltaic power plants.
How does the 3S-C2 work?
External sensors are plugged into the connectors on the box. Since each sensor type has a different number of pins, each cable only fits into its own slot. This prevents incorrect connections from the outset. After connecting the external sensors all you need to do is connect the sensor box to a receiver unit and a power supply.
The enclosure collects measurements from the sensors and transmits them to a data logger or SCADA system via Modbus RTU over an RS485 line. The register address map is based on the SunSpec standard.
Why Choose 3S-C2 Sensor Box?
SEVEN Sensor Box offers many advantages to its users.
- There are no incorrect connections: Each sensor connector has a different number of pins. It works on a plug-and-play basis with waterproof connectors.
- One line, lots of data: Collects temperature, humidity, and wind data on a single Modbus RTU line.
- SunSpec compliant: The register address map is based on the SunSpec standard and easily integrates with common data loggers.
- Built for the field: The UV-protected aluminum housing and weather-resistant cable withstand harsh environments.
- Quick installation: Mounting hardware and necessary materials are provided by SEVEN.
- SEVEN support: Remote installation service, free software updates, and customer support are standard.
Which sensors can be connected to SEVEN Sensor Box?
SEVEN external sensors can be connected to the 3S-C2. The box contains a maximum of 4 inputs and 1 output connector. The following sensors are supported.
| Sensor | Model | Connector |
| Wind Speed Sensor | 3S-WS-PLS | 3-pin |
| Wind Direction Sensor | 3S-WD | 4-pin |
| Module Temperature Sensor | 3S-MT-PT1000 | 5-pin |
| Ambient Temperature Sensor | 3S-AT-PT1000 | 6-pin |
| Relative Humidity & Ambient Temperature Sensor | 3S-RH&AT | 7-pin |
Available Sensor Box Models
The 3S-C2 is available in different models depending on which sensors will be connected. You can choose the model that suits your needs.
| Model | Explanation |
| 3S-C2-AT | This model allows the connection of an ambient temperature sensor and other external sensors. (excl. relative humidity) |
| 3S-C2-RH | This model allows the connection of relative humidity and ambient temperature sensors, as well as other external sensors. |
How to Connect the Sensor Box?
The box is secured to the mounting location with four M5 bolts. After the external sensors are connected to their respective connectors, the power and communication cables are connected according to the following color code.
| Cable Color | Function |
| Brown | Power (+) |
| White | Power (-) |
| Green | RS485 A / Data (+) |
| Yellow | RS485 B / Data (-) |
| Red | RS485 data signal ground |
| Black | Protective grounding |
Note: The power and communication cables must always be routed separately from the AC/DC cables. The device complies with IEC 61000-4-2 (ESD) and IEC 61000-4-5 (overvoltage) standards. Installation and electrical connections must be performed by a qualified electrician.
Frequently Asked Questions
What exactly is the purpose of a sensor box?
The purpose of the box is to work as a hub for external sensors and transmit their data to data loggers or SCADA systems via a single Modbus RTU line.
Which sensors can be connected to SEVEN Sensor Box?
Module temperature sensors, ambient temperature sensors, wind speed sensors, wind direction sensors, relative humidity & ambient temperature sensors can be connected.
How many sensors can be connected to SEVEN Sensor Box?
The box contains a maximum of 4 input connectors for external sensors.
Which output and protocol does SEVEN Sensor Box use?
It uses Modbus RTU over RS485 and is SunSpec compliant.
Which data logger brands is SEVEN Sensor Box compatible with?
It is compatible with many well-known data logger brands such as Huawei, Sungrow, Growatt, SMA, Goodwe, and more.
How is SEVEN Sensor Box configured?
Configuration and testing are performed using the 3S-IS Configuration Tool. A Windows computer and a USB to RS485 converter are required.
What power supply does SEVEN Sensor Box need?
It operates with 12-30 V DC, we recommend 24 V.
What protection class does SEVEN Sensor Box have?
Standard IP54. IP68 is available as an option.
What is SEVEN Sensor Box housing made of?
The housing of the Sensor Box is made from UV-protected aluminum.
Does SEVEN Sensor Box require maintenance?
Connectors, cables, and enclosures should be inspected periodically. According to IEC 61724-1:2021 standard, the monitoring system should be checked at least once a year.
What is the price of the SEVEN Sensor Box?
Depending on the model, the 3S-C2 is offered at approximately €140 to €265. Contact us for the exact price.
What are the delivery times for SEVEN Sensor Box?
Delivery time varies depending on the order quantity. Small orders are shipped in approximately 3-5 days, while bulk orders (100 units) are shipped in approximately 4-6 weeks.
What is the warranty of the Sensor Box?
The warranty period for Sensor Box is two years against manufacturer defects.