---
lang: "en"
title: "TST300 High Precision MODBUS Temperature Sensor"
sku: "TST300"
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brand: "MARCOM S.r.l."
end_of_life: "false"
---

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TST300 is a precision temperature sensor with MODBUS RTU interface and a working range from -20 to +60 °C.

The TST300 provides stable digital measurements directly to PLCs, data loggers, and building automation systems. It is a reliable solution for environmental control in data centers, server rooms, and industrial cabinets.

TST300 is a precision temperature sensor with a MODBUS RTU interface. The device does not require external power; it is powered via the interface. It is an excellent solution for precise temperature monitoring and control. The factory-calibrated temperature sensor integrates a band-gap temperature sensing element plus signal processing and provides a fully calibrated digital output. It delivers high measurement accuracy starting from ±0.13 °C in the range from +20 to +60 °C. It operates with 12-bit accuracy from the integrated digital-to-analog converter. Current consumption is less than 5mA, while the supply voltage is between 4 and 5.5VDC. It focuses on applications requiring precise temperature monitoring: server rooms, offices, grocery and food stores, etc. It is also suitable for smart office applications, as well as for data loggers and thermostats.

TST300 communicates with controllers via an RS-485 interface. Each sensor has a unique serial code, allowing support for multiple sensors on the same RS-485 bus. The digital temperature sensor uses two RJ45 connectors for easy daisy-chain wiring. A standard UTP/FTP LAN patch cable can be used for interconnection between sensors and the controller.

## Technical Specifications

- Operating temperature range: -20 to 60 °C
- Operating relative humidity range: 10 to 90% (non-condensing)
- Storage temperature range: -20 to 60 °C
- Storage relative humidity range: 10 to 90% (non-condensing)
- Protection rating: IP20
- Operating voltage range (including -15/+20% according to IEC 62368-1): 4.5 to 26 VDC
- Current consumption: 7 mA @ 5 VDC
- Accuracy: ±0.2 °C (in the range -10 to +60 °C)
- Accuracy: ±0.3 °C (in the range -20 to +60 °C)
- Resolution: 0.1 °C
- Maximum number of transceivers on the bus: 32
- Response time: ≤ 50 ms
- Master response timeout: ≥ response time + message response time (*answer time*)
- Dimensions: 85 x 35.1 x 23.5 mm

#### Versatile Applications

- Server rooms and telecommunication infrastructures
- Building Management Systems (BMS) and HVAC
- Electrical panels and industrial control cabinets
- Data acquisition in manufacturing and utilities
- 14-bit resolutions
- IP20 ingress protection
- Each device has a unique 64-bit serial number

### Can be used with the following Modbus controllers

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Source: https://shop.marcomweb.it/en/modbus/tst300-high-precision-modbus-temperature-sensor

MARCOM S.r.l. — a trusted supplier for industrial automation and building automation.