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Min. Order : 1 Piece

Coal mine security inspection CO/CH4/CO2/O2 Gas concentration real time monitor/detector

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Quick Details

Port: Tianjin, Qingdao, Shanghai, HK etc.
Payment Terms: L/C,D/P,T/T,Western Union,MoneyGram,PayPal
Supply Ability: 3000 Piece/Pieces per Month
working temperature: -20~60 degree
Brand Name: chicheng
Detected way: Natural diffusion
Usage: gas concentration detector
Warranty: Free calibration and free warranty within a year
Place of Origin: Henan China
Ex-proof grade: Ex dIICT6 GB
IP grade: IP66
Output signal: 4-20mA or RS485
Material: Stainless steel
Model Number: QB2000N
Size of external carton: 27*23*13cm
Sensor: Catalytic combustion or electro-chemical sensor
Delivery Detail: 1-3 working days
Packaging Detail: Size of packaging box is: 21.5*17*10cm. Net weight is 1.6 kg/pc. Gross weight is 2.0kg/pc.
Henan Chicheng Electric Co., Ltd.
Manufacturer, Trading Company
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US$ 230,000+
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Coal mine security inspection CO/CH4/CO2/O2 Gas concentration real time monitor/detector


Product Description
QB2000N is a fixed N2/CO Gas concentration real time monitor with original imported catalytic combustion or electrochemistry sensor. It monitors gas leakage by natural diffusion. Once the gas concentration exceed the preset alarm point,  it will start the acoustic-optical alarm on the central unit and drive the external equipment like exhaust fans.
  1. 4-20 mA or RS485 ModBus RTU output proportional to the gas leakage concentration.
  2. Flexible, durable, accuracy, stable etc.
  3. Can be directly connected with DCS systems or Central unit.
  4. With relay output, It has been widely used in petrol, chemistry, metallurgy, artifice, gas transportation, biological medicine and water procession etc.


  • 4-20mA analog output for direct communication to DCS system,  RS485 ModBus outputfor central unit
  • Relay output for connecting external device
  • LCD display screen (LED display screen optional)
  • Sensormodule (block) design on -spot replacement s and automatically distinguish sensor fault and current display fault simultaneously
  • Password verification for repeat operation, avoid fault operations
  • -40~+70°C following compensation for accurate detecting
  • Second grade visual alarms on-site and Relay (connected with audible/visual alarms or drive exhaust device)
  • User-selectable alarm setpoint (s)

Note: QB2000N is with the digital display screen but QB2000T is without the digital display screen. The visual and audible alarm is optional.


Technical Data

Technical parameters:



                           Detect gas

Combustible gas, toxic gas and oxygen

                       Operating range

See the attached chart


3% F.S

                       Response time


                 Operating temperature

-20~+60 degree


<90%RH non-condensation

                      Working current

<=50 Ma

                       Output signal

4~20mA standard signal (RS485 output optional)

                          IP grade


                         Net weight


               Mounting screw thread

M20*1.5 or G1/2

                 Transmition distance


    Power supply to the detector terminals

16~30V DC

                    Alarm indication

> 85dB the higher of buzz frequency, the higher gas concentration is

                  Anti-explosion class

Ex d IICT6Gb



Detailed images

_02QB2000N LCD.jpgQB2000N anti-dust.jpgQB2000N screw.jpg



Packaging & Shipping

Packaging & shipping:

Size of packaging box is:  21.5*17*10cm. Net weight is 1.6 kg/pc. Gross weight is 2.0kg/pc. 

-Fast delivery:

Sample order in stock and 3-7 working days for bulk production.


You can pay for the order via T/T, Western Union, PayPal & Money Gram.


We have strong cooperation with DHL, TNT, UPS, FEDEX, EMS, CHINA AIR POST.

You also can choose your own shipping forwarder.




Our service:

a. All products will have been strictly Quality Checked before packaging. 
b. All products will be well packaged before shipping. 
c. All the similar products have two years warranty. The calibration within one year is FOC with the fright cost charged. And we promise the products will be free from maintenance within warranty period.


Installation Position:

Upon the gas detected weight compared with the air under the same condition of temperature and pressure, if its weight is lighter than the air, e.g. CH4, the position should be 2m—3.5m higher than the gas leakage source; While if its weight is heavier than the air, the position is 0.36—0.6m higher than the ground.

Company Information

Company Information

Henan Chicheng Electric Co., Ltd is a ISO9001-2000 certified high-tech import and export company and also the government permitted gas detecting device manufacture with Measurement of production License (MC), The explosion-proof certificate (EX) and Fire type certificate (CNAS) approved, we are in in the research and marketing a range of portable and fixed gas detection products, industrial process automation control, safety protection and analytical instrument and we are in Zhengzhou Henan China.

We aim at providing customers quality product. Each properly suited to its task, timely service and support. Sincerely welcome customers worldwide.

Your questions will be highly appreciated, please feel free to contact us.

                                                                                                 Thank you for visiting~~