Overview

The Stox Smart Sensor Device is an intelligent sensor device from AQ Sense, which has a 4-20mA two-wire and a RS485 Modbus RTU output signal. It uses an intelligent microprocessor with high-reliability solid polymer electrochemical gas sensor technology and intelligent algorithm calculation. The Stox Device is a smart solution for industrial safety applications, combining temperature and humidity in one sensing device.

Features

4-20mA standard two-wire and RS485 Modbus-RTU output, 24V DC. power supply
Detects single gas + temperature and humidity at the same time
With calibration, sensor performance
Fast signal stability time at power on
Suitable for indoor and outdoor environments, sensor can work in -40 to 55 ℃
Response time is fast and has a stable zero point without drift, anti-electromagnetic interference ability
Long lifetime, anti-poisoning
Integrated safety protection enables use in potentially explosive environments
Electronic circuit boards have a dust and corrosion resistant coating
Small size
RoHS approved

Technology Specifications

Principle

Accuracy

Repeatability

Long-Term Drift

Solid Polymer Electrochemical Sensing Technology

± 5% F.S

< 2 %

< 1 %/month

Sensor Life Expectancy

> 3 years

Warranty

12 months

Parameters

-40℃ to +85℃

Output Signal Interface

4-20mA two-wires (Only gas sensor ouput, without temperature and humidity)

Fault Output

Supply Voltage

Supply Current

Power Consumption

Maximum Loop Resistance

3mA Fault Signal: Sensor failure or sensor disconnection

12 to 24V DC

3 to 22mA

< 0.6W

< 500R @ 24V DC

Product

Smart Organic Volatiles Sensor Device

Gas Formula

TVOC

Range

0-10 ppm

0-200 ppm

Resolution

0.01 ppm

0.1 ppm

Response Time

< 3s (T90 < 30s)

Applications

· On-line monitoring of industrial exhaust emissions

· Industrial process gas monitoring

The intelligent Gas Sensor Device provides a self-test, which evaluates the sensor performance without a gas measurement. Therefore, it is the excellent solution for smart home and IoT applications. The data is put out through the the output signal or RS485 transmission command, which makes it easy and convenient to identify the right time to perform maintenance and replacement.

Each Stox Sensor Device has been professionally calibrated with the gas. It can be instantly used without prior warm-up time and the calibration information is stored in the flash chip. There is a calibration software from AQ Sense in case a recalibration should be performed with the RS485 output or the 4-20mA output signal should be corrected.

The Stox Gas Sensor Device has a standard 4-20mA two-wire or RS485 Modbus RTU output signal that allows for quick device and system setup or connection to a display, DCS, PLC and other systems.

Gas Sensor Specifications

Temperature & Relative Humidity Sensor Specification (Inside housing)

Temperature

Humidity

0-100% RH

Range

0.01℃

0.01% RH

Resolution

± 2% RH

± 0.2℃

Accuracy

Response Time

Long-Term Drift

< 5s to 30s @ t63%

8s @ t63%

< 0.02 °C /year

< 0.25% RH/year

Electrical Parameters

Or RS485 Modbus-RTU (Gas with temperature and humidity sensor signal output)

3.5mA Fault Signal: Sensor signal is weak

RS485 Modbus-RTU output with sensor life and performance detection and early sensor failure warning

Environmental Parameters

Mechanical Parameters

Operating Temperature

Sensor can work from -40℃ to +55℃

15-95% RH. Non-condensing

Operating Humidity

Working Pressure

Storage Temperature

Atmospheric pressure ± 10%

0℃ to 20℃

Size

Power Cable Length

Package Measurement

39 x 130mm

1 m

185 x 150 x 108 mm

· Sewage treatment, garbage treatment, methane safety monitoring

· Electronic gas purification monitoring in semiconductor factories

· Laboratory environment toxic and harmful gas leakage monitoring

Partnumber

05-Stox-TVOC-10-01

05-Stox-TVOC-200-01

Weight

135 g

05-Stox-TVOC-2000-01

05-Stox-TVOC-10000-01

0-2000 ppm

0-10000 ppm

1 ppm

10 ppm

< 3s (T90 < 30s)