AQS
Stox-TVOC Smart Organic Volatiles Sensor Device
· 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.
Overview
The Stox Smart Organic Volatiles Sensor Device is an intelligent sensor device from EC 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.
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 EC 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.
Principle
Stox Sensor Device is a durable product. It converts the original small current signals of the gas sensors into a standard 4-20mA or RS485 Modbus-RTU output through a digital circuit.
The Sensor Device uses the Solid Polymer Electrochemical Sensing Technology. It employs a three-electrode arrangement - the working, the counter and the reference electrodes - in which concentration measurements can be performed continuously and the sensor operates at a fixed potential. The gas of interest (target gas) diffuses through a diffusion barrier, like a capillary, into the cell to the working electrode, where an electrochemical reaction takes place. Oxidation and reduction reactions are happening simultaniously. The current flowing through the cell is direct proportional to the concentration of the target gas. A reference electrode keeps the potential constant together with a potentiostat.
Specification
Gas Sensor Specifications |
|
Principle |
Solid Polymer Electrochemical Sensing Technology |
Accuracy |
± 5% Full scale |
Repeatability |
< ± 2% |
Linearity |
Linear |
Long-Term Drift |
< 1% / month |
Expected Lifetime |
> 3 years |
Temperature & Relative Humidity Sensor Specification |
||||||
Parameter |
Range |
Resolution |
Accuracy |
Repeatability |
Response Time |
Long-Term Drift |
Temperature |
-40 to 85°C |
0.01°C |
± 0.2°C |
0.1°C |
< 5 to 30s @ t63% |
< 0.02°C / years |
Humidity |
40-100%RH |
0.01%RH |
± 2%RH |
0.1%RH |
8s @ t63% |
< 0.25%RH / years |
Electrical Specifications |
|
Optional Output Signal |
4-20mA two-wires (Only gas sensor ouput, without temperature and humidity) |
Or RS485 Modbus-RTU (Gas with temperature and humidity sensor signal output) |
|
Fault Output |
3.5mA Fault Signal: Sensor signal weak |
3mA Fault Signal: Sensor failure or sensor disconnected |
|
RS485 Modbus-RTU output with sensor life and performance detection and early sensor failure warning |
|
Supply Voltage |
12 to 24V DC |
Supply Current |
3 to 22mA |
Power Consumption |
< 0.6W |
Maximum Loop Resistance |
< 500R@24V DC |
Environment Specifications |
|
Operating Temperature |
Sensor can work from -40 to +55℃ |
Operating Humidity |
15-95% RH. Non-condensing |
Operating Pressure |
Atmospheric pressure ± 10% |
Storage Temperature |
0 to 20℃ |
Mechanical Specifications |
|
Size |
39 x 130mm |
Weight |
135g |
Power Cable length |
1m |
Warranty |
12 months |
Package Size |
185 x 150 x 108mm |
Product |
Gas Formula |
Partnumber |
Range |
Resolution |
Response Time |
Smart Organic Volatiles Sensor Device |
TVOC |
05-Stox-TVOC-10-01 |
0-10ppm |
0.01ppm |
< 3s (T90 < 30s) |
05-Stox-TVOC-200-01 |
0-200ppm |
0.1ppm |
< 3s (T90 < 30s) |
||
05-Stox-TVOC-2000-01 |
0-2000ppm |
1ppm |
< 3s (T90 < 30s) |
||
05-Stox-TVOC-10000-01 |
0-10000ppm |
10ppm |
< 3s (T90 < 30s) |
SOLUTION
CONSULT
DYNAMIC
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