Winsen CMV-2021D MEMS Catalytic H2 Sensor Instruction Manual
- June 15, 2024
- Winsen
Table of Contents
Winsen CMV-2021D MEMS Catalytic H2 Sensor
Statement
This manual copyright belongs to Zhengzhou Winsen Electronics Technology Co., LTD. Without written permission, any part of this manual shall not be copied, translated, or stored in a database or retrieval system, and also can’t be spread through electronic, copying, or recording ways.
Thanks for purchasing our product. To let customers use it better and reduce the faults caused by misuse, please read the manual carefully and operate it correctly by the instructions. If users disobey the terms or remove, disassemble, or change the components inside of the sensor, we shall not be responsible for the loss. The specifics such as colour, appearance, sizes &etc, please in kind We are devoting ourselves to product 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 the optimized using way are welcome. Please keep the manual properly, to get help if you have questions during the usage in the future.
Profile
CMV-2021D catalytic hydrogen sensor adopts MEMS process works according to the principle of catalytic combustion effect and is paired with a detection element and a compensation element to form an arm of the bridge, when the resistance of the detection element increases, the output voltage of the bridge changes, the voltage variable increases proportionally with the increase of hydrogen concentration and the compensation element plays a reference and temperature and humidity compensation role.
Features
The bridge output is linear
Quick response
Good repeatability and selectivity
Good stability and reliability
Low power consumption
Excellent anti-interference ability
Main Applications
- Hydrogen-powered vehicle
- Hydrogen energy preparation
- Hydrogen energy storage
- Hydrogen energy transport and use
- Hydrogen detection in other scenarios
Basic circuit
The right picture is the basic test circuit of CMV-2021D. It should be applied by 3.0V. D is the test element while C is the compensation element.
Technical Parameters Table
Sensitivity, response and recovery
Changing the output signal with a different voltage supply
Selectivity
Cautions
The following conditions must be prohibited
Exposed to organic silicon steam
Sensing material will lose sensitivity and never recover if the sensor absorbs
organic silicon steam. Sensors must avoid exposure to silicon bonds, fixtures,
silicon latex, putty or plastic-containing silicon environment.
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 the sensor
structure but also cause sincere sensitivity attenuation.
Alkali, Alkali metals salt, halogen pollution
The sensor’s performance will be changed badly if sensors are sprayed and
polluted by alkali metals salt, especially brine, or exposed to halogen such
as fluorine.
Touch water
The sensitivity of the sensors will be reduced when spattered or dipped in
water.
Freezing
Do avoid icing on the sensor’s surface, otherwise sensing material will be
broken and lose sensitivity.
Applied higher voltage
The applied voltage on the sensor should not be higher than the stipulated
value, even if the sensor is not physically damaged or broken, it causes down-
line or heater damage and causes on sensor’s sensitivity characteristic to
change badly.
The following conditions must be avoided
Water Condensation
Indoor conditions and slight water condensation will influence sensors’
performance lightly. However, if water condensation is on the sensor surface
and keeps a certain period, the sensor’s sensitivity will be decreased.
Used in high gas concentration
Whether the sensor is electrified or not, if it is placed in high gas
concentration for a long time, sensor characteristics will be affected. If
lighter gas sprays the sensor, it will cause extreme damage.
Long time storage
The sensor’s resistance will drift reversibly if it’s stored for a long time
without electricity, this drift is related to storage conditions. Sensors
should be stored in airproof bags without volatile silicon compounds. For the
sensors with long-term storage but no electrification, they need a long
galvanic aging time for stability before use. The suggested aging time is 24
hours at least if the storage time is more than half a year.
Long time exposed to adverse environment
Whether the sensors are electrified or not, if exposed to an adverse
environment for a long time, such as high humidity, high temperature, or high
pollution etc., it will influence the sensors’ performance badly.
Vibration
Continual vibration will result in sensor down-lead response and then break.
In transportation or assembling lines, a pneumatic screwdriver/ultrasonic
welding machine can lead to this vibration.
Concussion
If sensors meet strong concussion, it may lead its lead wire to disconnect.
Usage Conditions
For sensors, handmade welding is the optimal way. The welding conditions are as follows:
- Soldering flux: Rosin soldering flux contains the least chlorine
- homo-thermal soldering iron
- Temperature： ≤350℃
- Time less than 5 seconds
If you use reflow welding, the welding conditions are as follows:
- Neutral atmosphere
- Welding temperature 250±10℃
- Avoid flux vapour
If disobey the above terms, sensor sensitivity will be reduced
Zhengzhou Winsen Electronics Technology Co., Ltd
Add: No.299, Jinsuo Road, National Hi-Tech Zone, Zhengzhou 450001 China
Tel: +86-371-67169097/67169670
Fax: +86-371-60932988
E-mail: [email protected]
Website: www.winsen-sensor.com