---
lang: "en"
title: "TSM400-4-CP CO2 and Pressure Sensor MODBUS"
sku: "TSM400-4-CP"
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brand: "TERACOM"
image: "https://shop.marcomweb.it/storage/5467/conversions/TSM400-4-CP-webp.webp"
end_of_life: "false"
---

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TSM400-4-CP: CO2 and pressure sensor with MODBUS RTU interface

Carbon dioxide (CO2) is a colorless and odorless gas. It is the fourth most abundant gas in the Earth's atmosphere. Its concentration, especially in indoor environments, is important for the health and efficiency of the people present.

TSM400-4-CP is a multiparametric sensor that supports the MODBUS RTU protocol via an RS-485 interface. The sensor measures barometric pressure and CO2 concentration. The MODBUS device integrates an advanced non-dispersive infrared (NDIR) sensing element for CO2 measurements. NDIR currently is the most widespread principle for measuring CO2 concentration. It is based on the absorption of infrared (IR) light at specific wavelengths by CO2 molecules.

The CO2 sensing element is built with integrated humidity and temperature sensors for enhanced accuracy. For carbon dioxide measurements, self-calibration is available, which is performed by leaving the sensor exposed to open air (about 400 ppm CO2 concentration). The basic sensing element for barometric pressure is factory calibrated and does not require recalibration during its lifetime.

The TSH400-4-CP sensor is housed in a slim plastic enclosure. The bottom part of the enclosure is suitable for installation on standard flush/recessed wall boxes with a maximum installation opening of 61 mm.

## Technical Specifications

- LED indicator for communication status
- Long-term stability based on digital signal processing
- Self-calibration in clean air for CO2 measurements
- Modifiable communication parameters
- Non-volatile memory for all settings
- Firmware update via interface
- Operating voltage range (including -15/+20% according to IEC 62368-1): from 4.5 to 26 VDC
- Current consumption: 25 mA @ 5 VDC (Peak: 150 mA @ 5 VDC)
- CO2 measurement range: from 400 to 5000 ppm
- Pressure measurement range: from 10 to 1200 hPa
- Response time: ≤ 50ms
- Operating temperature range: from -20 to 60 °C
- Operating relative humidity range: from 5 to 95% (non-condensing)
- Storage temperature range: from -20 to 60 °C
- Storage relative humidity range: from 5 to 95% (non-condensing)
- Protection rating: IP20

### The sensor can be used with:

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Source: https://shop.marcomweb.it/en/modbus/tsm400-4-cp-co2-and-pressure-sensor-modbus

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