SmArtGas 4 VOC sensor

SmArtGas 4 is a gas detector specifically designed for measuring, monitoring and detecting hazardous gases in explosive (Ex) environments. It withstands harsh industrial environments where conditions may vary significantly (high temperature, corrosive gases or vapours, mist and dust).

The device can be installed in several ways: integrated into the Sigma Gas gas safety system, as a standalone detector, or connected to supervisory systems (e.g. via a 4–20 mA output signal or RS-485 interface). SmArtGas 4 has been developed as a replacement for the earlier models Sigma SmArt and SmArtGas3 and is based on an entirely new electronic

solution.

Key benefits

Suitable for use in explosive (Ex) zones, with ATEX and IECEx certification

New sensor head (FL or FH) with significantly improved detection capability

The pellistor sensor offers half the response time (T90) and is among the fastest devices on the market

Greater sensor head protection against environmental influences, including moisture and dust, thanks to the PTFE membrane (up to IP67)

Enhanced interface for external connections

Reduction of long-term drift of catalytic sensors

Flexible installation: integrated into the system, standalone, or connected to supervisory systems

Integrated optical and acoustic signalling (depending on configuration)

Technical data

Product code: PW-044-SG4-X

Supply voltage: 15–50 V VCC

Power: 0.3–4 W (depending on configuration)

Operating environment humidity: 10–90% (long-term), 0–99% (short-term), non-condensing

Pressure: 1013 ± 10% hPa

Protection class: IP65 / IP67 (sensor head with FL.M / FH.M membrane), IP66 / IP67 (with OB2), IP63 (other sensor heads)

Analogue output: 4–20 mA (sink / source), RLOAD_MAX 300 Ω, US_MAX 30 V

Digital output: 3 x potential-free contact, NO/NC, 24 V / 0.3 A

Digital communication: RS-485 (Modbus ASCII, Modbus RTU, Sigma Bus / Sigma Safe, Teta Bus)

Wireless communication: Bluetooth 4.2

Response time (catalytic sensor, T90): hydrogen ≤ 9 s, methane ≤ 13 s, propane ≤ 17 s, ethanol ≤ 18 s

Sensor head material: SS316L

Weight: 3.5 kg

Cable entry: external thread M20 x 1.5, cables 0.5–2.5 mm²

Certificates: FTZU 19 ATEX 0028X / IECEx FTZU 20.0007X

Mandatory periodic inspection: every 12 months (validity of the calibration certificate)

Installation: on a supporting structure, 2 screw holes 4 mm, hole spacing 127 mm