Overview

The StoxPro Gas Sensor Device is an intelligent gas sensor device from AQ Sense with a two-wire 4-20mA and RS485 Modbus-RTU output signal, where one of the two signals can be selected. The device utilizes a smart microprocess with high-reliability Solid Polymer Electrochemical Gas Sensing Technology and intelligent algorithm calculation. The StoxPro is a smart solution that combines temperature and humidity in one Sensor Device for industrial safety application.

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 and life-testing output.

• Fast signal stability time at power on.

• Suitable for indoor and outdoor environments, sensor can work in -40 to 55 °C.

• Long lifetime, anti-poisoning.

• Response time is fast and has a stable zero point without drift, anti-electromagnetic interference ability.

• Integrated safety protection enables use in potentially explosive environments.

• Electronic circuit boards have a dust and corrosion resistant coating.

• Small size.

• CE EN61326-1:2013, EMI, 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

Two-wire 4-20mA (gas sensor signal output, without temperature and humidity sensor output)

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 Hydrogen Sensor Device

Gas Formula

H2

Range

0-1000 ppm

0-4% vol

Resolution

1 ppm

0.01% vol

Response Time

< 3s (T90 < 60s)

< 3s (T90 < 60s)

Applications

· Industrial gas safety monitoring

· Industrial process gas monitoring

· Hydrogen energy gas leakage safety monitoring

· Transformer failure and power environment monitoring

The StoxPro Gas Sensor Device is suitable for indoor and outdoor environments. It detects gas, temperature and humidity and easily receives all data simultaneously. The changing state of gas is closely related to temperature and humidity, for which this combination of the StoxPro Gas Sensor Device provides a professional solution with a RS485 and temperature and humidity signal output.

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 output signal or RS485 transmission command, which makes it easy and convenient to determine the right time to perform maintenance and replacement.

Each StoxPro 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 with the RS485 output is required or the 4-20mA output signal needs to be corrected.

The front cover of the StoxPro is designed with three different structural forms: Diffusion Cover, Flow Cover, Duct Mounting Cover. The Diffusion Cover is suitable for gas detection in open spaces, where the gas reaches the sensor by diffusion and convection. The Flow Cover is suitable for detecting gas that is actively pumped to the sensor by a gas sampling pump, or for the gas that is under positive pressure (or at a flow rate) in the vicinity of the detected gas to reaching the sensor by flow. The Duct Mounting Cover is suitable for installations that measure gas concentrations in confined spaces and are sealed with threads or flanges.

The StoxPro Gas Sensor Device has the standard 4-20mA two-wire or RS485 Modbus-RTU output signal that allows for quick instrument and system setup or connection to 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

± 5% F.S

± 5% F.S

Accuracy

Response Time

Long-Term Drift

< 5s to 30s @ t63%

8s @ t63%

< 0.02 °C /year

< 0.25% RH/year

Electrical Parameters

Note: The temperature and humidity sensor is located inside the StoxPro housing. If the temperature parameters are to be used for external environmental measurements, please calibrate the measured value. The ambient gas cannot be exchanged with the gas inside the StoxPro housing, so the humidity is only used for the measurement inside the enclosure. This parameter cannot be obtained when the 4-20mA output is selected. It is only applicable to the RS485 output.

Or RS485 Modbus-RTU (gas + temperature and humidity sensor signal output to detect housing temperature and humidity)

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

-40℃ to +55℃

15-95% RH. Non-condensing

Operating Humidity

Working Pressure

Storage Temperature

Air pressure ± 10%

0℃ to 20℃

Size

Power Cable Length

Package Measurement

Please download the "Datasheet"

1 m

185 x 150 x 108 mm

· Hydrogen vehicle safety monitoring

· Hydrogen energy logistics storage environment monitoring

· Data center hydrogen leak monitoring

· Fire safety monitoring of hydrogen batteries