Winsen ME4-H2S User manual

Hydrogen Sulfide Gas Sensor
（Model：ME4-H2S）
Manual
Version: 1.2
Valid from: 2014-05-01
Zhengzhou Winsen Electronics Technology Co., Ltd

Statement
This manual copyright belongs 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.
Zhengzhou Winsen Electronics Technology CO., LTD

ME4-H2S Hydrogen Sulfide Gas Sensor
Profile
ME4-H2S hydrogen sulfide gas sensor is constant potential
electrolysis type. Oxidation-reduction reaction with
hydrogen sulfide and oxygen take place respectively on
the working electrode and on the counter electrode. The
process releases electric charge and generates current.
The current is in direct proportion to the concentration of
hydrogen sulfide. So the concentration of the target gas
could be got by measuring the value of current.
Features
Low power consumption, high precision, high sensitivity, wide linear range,
good anti-interference ability, excellent repeatability and stability.
Main applications
It is used for hydrogen sulfide detection in industrial occasions, mine and environmental
protection field.
Technical Parameters Stable1.
Detection Gas
Hydrogen Sulfide(H2S)
Detection Range
0～100ppm
Max range
500ppm
Sensitivity
(0.8±0.15)µA/ppm
Resolution
0.1ppm
Response Time(T90)
＜30S
Bias Voltage
0mV
Load Resistance
10Ω(recommended)
Repeatability
＜2﹪Output value
Stability(/month)
＜2﹪
Output Linearity
Linear
Zero drift(-20 ℃ ～40 ℃)
≤0.2ppm
Temperature range
-20 ℃ ～50 ℃
Humidity range
15﹪～90﹪RH
Pressure range
standard atmospheric pressure±10﹪
Lifespan
2years(in air)

Zhengzhou Winsen Electronics Technology Co., Ltd www.winsensor.com
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Basic Circuit
Fig2: ME4-H2S test circuit
Description of sensor characters
Fig3.Responce and Resume Fig4.Linearity
Fig1.Sensor Structure

Zhengzhou Winsen Electronics Technology Co., Ltd www.winsensor.com
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Fig5.Output of sensor at different temperature Fig6.Zero output of sensor at different temperature
Cross Interference
ME4-H2S sensor also can respond to other gases besides target gas H2S. Following data are
the response characteristics of the sensor to interferential gases at certain concentration for
your reference.
Stable2. Cross interference
Interferential Gas
Concentration
ME4-H2S
CO
200ppm
＜0.5 ppm
Cl2
10 ppm
＜-0.7 ppm
C2H4
400 ppm
＜0.3 ppm
H2
10000 ppm
＜5 ppm
Alcohol
1000 ppm
＜0.3 ppm
NH3
50 ppm
＜-0.3 ppm
H2S
20 ppm
＜1.6 ppm
PH3
20 ppm
＜14 ppm
Methanal
10 ppm
＜2.5 ppm
Benzene
100 ppm
＜0.2 ppm
Methanol
200 ppm
＜0.15 ppm
Cautions!
Tin soldering is prohibited.
Before using, power on to aging for more than 48 hours is necessary.
Pins can’t be broke off or bent.
Don’t disassemble the sensor to avoid the damage caused by electrolyte leakage.
Avoid contacting organic solvent (including Silicone rubber and other adhesive), coatings, medicine,
oil and high concentration gases.
All the electrochemical sensors shall not be encapsulated completely by resin materials, and
shall not immerse in pure oxygen environment, otherwise, it will damage the function of sensor
All electrochemical sensors shall not be applied in corrosive gas environment, or the sensor will
be damaged
Zero calibration should be finished in clean air.
During test and usage, sensors should avoid the gas inflow vertically
The side for inflow can’t be choked and polluted.
The laminating film above the sensor surface can’t be uncovered and damage.

Zhengzhou Winsen Electronics Technology Co., Ltd www.winsensor.com
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Excessive impact or vibration should be avoided
It takes some time for the sensor to return to normal state after it is applied in high
concentration gas
Working electrode and reference electrode of the sensor shall be in short circuit when stored
Prohibit to use the hot cement or sealant of which the curing temperature is higher than80℃
to make the capsulation for the sensor.
Prohibit storage and usage for long time in alkaline gases with high concentration.
Do not use the sensor when the shell is damaged
Zhengzhou Winsen Electronics Technology Co., Ltd
Add.: NO.299 Jin Suo Road, National Hi-Tech Zone,
Zhengzhou, 450001 China
Tel.: [phone] 67169670
Fax:[phone]
E-mail:[e-mail]