Winsen MC33J Catalytic Gas Sensor User Manual

Catalytic Gas Sensor
(Model：MC33J)
Manual
Version: 1.0
Valid from: 2023-10-27
Zhengzhou Winsen Electronics Technology Co., Ltd

Statement

This manual copyright belongs to Zhengzhou Winsen Electronics Technology Co., LTD. Without the written permission, any part of this manual shall not be copied, translated, stored in database or retrieval system, also can’t spread through electronic, copying, record ways.
Thanks for purchasing our product. In order to let customers use it better and reduce the faults caused by misuse, please read the manual carefully and operate it correctly in accordance with the instructions. If users disobey the terms or remove, disassemble, change the components inside of the sensor, we shall not be responsible for the loss.
The specific such as color, appearance, sizes & etc, please in kind prevail.
We are devoting ourselves to products development and technical innovation, so we reserve the right to improve the products without notice. Please confirm it is the valid version before using this manual. At the same time, users’ comments on optimized using way are welcome.
Please keep the manual properly, in order to get help if you have questions during the usage in the future.

MC33J Catalytic Gas Sensor

Profile

MC33J adopts catalytic combustion principle, and its two arms of electric bridge consists of a test element and a compensate element. The resistance of the test element rises once it meets the hydrogen gas, at the same time, the output voltage of the bridge changes and the voltage variation rises in direct proportion to the gas concentration. The compensate element, as a reference, has the function of compensating temperature and humidity.

Features

The bridge output is linear, quick response, good repeatability and selectivity, good stability, excellent resistance to the interference of hydrogen sulfide gas and organosilicon.

Main Applications

Mainly used for hydrogen leakage alarm or concentration detection in home, vehicle and other fields.

Technical Parameters

Basic Circuit

Sensor Characterization

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Figure 3: Sensor Sensitivity Curve| Figure 4: Sensor Response Recovery
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Figure 5: Zero output of the sensor at different temperature conditions| Figure 6: Sensitivity output of the sensor at different temperature conditions
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Figure 7: Zero output of the sensor at different voltage conditions| Figure 8: Sensitivity output of the sensor at different voltage conditions

Cautions

1. Following conditions must be prohibited
   1.1 Exposed to organic silicon steam Sensing material will lose sensitivity and never recover if the sensor absorbs organic silicon steam.
   Sensors must avoid exposing to silicon bond, fixature, silicon latex, putty or plastic contain silicon environment.
   1.2 High Corrosive gas
   If the sensors are exposed to high concentration corrosive gas (such as H2 S, SOX , Cl2, HCl etc.), it will not only result in corrosion of sensors structure, also it cause sincere sensitivity attenuation.
   1.3 Alkali, Alkali metals salt, halogen pollution
   The sensors performance will be changed badly if sensors be sprayed polluted by alkali metals salt especially brine, or be exposed to halogen such as fluorine.
   1.4 Water Contacting
   Sensitivity of the sensors will be reduced when spattered or dipped in water.
   1.5 Freezing
   Water freezing on the surface of a sensitive element can cause the sensitive material to fragment and lose its sensitive properties.
   1.6 Applied higher voltage
   If the voltage applied to the sensor is higher than the specified value, even if the sensor is not physically damaged or destroyed, it can cause damage to the leads and cause a decrease in the sensitive characteristics of the sensor.

2. Following conditions to be avoided whenever possible
   2.1 Water Condensation
   Indoor conditions, slight water condensation will influence sensors’ performance lightly. However, if water condensation on sensors surface and keep a certain period, sensors’ sensitive will be decreased.
   2.2 Used in high gas concentration
   No matter the sensor is electrified or not, if it is placed in high gas concentration for long time, sensors characteristic will be affected. If lighter gas sprays the sensor, it will cause extremely damage.
   2.3 Long time storage
   Sensors stored for long periods of time without power can produce reversible changes in their sensitive materials, which are related to the storage environment. Sensors should be stored in a sealed bag with clean air and without silica gel. Sensors that have been stored unenergized for a long period of time need to be energized for a longer period to stabilize before use. If stored unenergized for more than six months, one day of aging is recommended before use.
   2.4 Long time exposed to adverse environment
   No matter the sensors electrified or not, if exposed to adverse environment for long time, such as high humidity, high temperature, or high pollution etc., it will influence the sensors’ performance badly.
   2.5 Vibration
   Continual vibration will result in sensors down-lead response then break. In transportation or assembling line, pneumatic screwdriver/ultrasonic welding machine can lead this vibration.
   2.6 Concussion
   If sensors meet strong concussion, it may lead its lead wire disconnected.

3. Recommendations for use
   3.1 Welding
   For sensor, handmade welding is optimal way. The welding conditions as follow:
   • Flux: Chlorine- and silicone-free, no-clean lead-free fluxes
   • Constant temperature soldering iron
   • Temperature: ≤350°C
   • Time: ≤ 5 seconds
   Violation of the above conditions of use will degrade the sensor characteristics.

TEL: +86-371-67169670 / 67169097
Email: sales@winsensor.com

References

• Winsen Gas Sensor_CO2 Sensor_Air Quality Sensor_Dust Sensor_CO Sensor-Winsen Electronics

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