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Wall Mount VOC Sensors / Alarm With LCD Display Relay , VOC Gas Detector 1~30ppm Range

Tongdy Sensing Technology Corporation
Tongdy Sensing Technology Corporation
City: Beijing
Province/State: Beijing
Country/Region: China
Tel: 86-10-59738930
Contact Person:
Mr Michael Zhang

Wall Mount VOC Sensors / Alarm With LCD Display Relay , VOC Gas Detector 1~30ppm Range

Brand Name : TONGDY
Model Number : G02-VOC-B3
Certification : CE/ ISO9001
Place of Origin : China
MOQ : 10pcs
Price : US$20~100
Payment Terms : T/T, Paypal
Supply Ability : 3,000pcs per month
Delivery Time : Depends on order quantity
Packaging Details : Cartons
Product Name : VOC detector
Mounting Type : Wall mount or Desktop type
Alarm : 3-color LCD, buzzer alarm
Output : LCD display, relay, Modbus RS485
VOC range : 1~30ppm
Power supply : 24VAC/VDC , 230VAC
Application : Home, office, classroom etc.
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Gas detection

Highly sensitive to many harmful gases, such as harmful gases from construction and decoration materials, VOCs (like toluene and formaldehyde); Cigarette smoke; Ammonia and H2S and other gases from household wastes; CO, SO2 from cooking and burning; Alcohol, Natural gas, detergent and other bad smells etc.

Sensing element

Semiconductor mix gas sensor of long working life and good stability

Signal update


Warm up time

72 hours (first time), 1 hour (normal operation)

VOC measuring range

1~30ppm ( 1ppm= 1 part per million

Display resolution


VOC setting resolution


Temperature & Humidity Sensor


Relative Humidity

Sensing element


Capacitive sensor

Measuring range


0 -95%RH


±0.5℃ (25℃, 40%-60%RH)

±4%RH (25℃, 40%-60%RH)

Display resolution




±0.5℃per year

±1%RH per year


1xRelay output to control a ventilator or air-purifier,

max current 3A resistance(220VAC)

Warning alarm

Inner buzzer alarm and also three colors backlit switch as well

Buzzer alarm

Alarm starts when VOC value above 25ppm

LCD backlit

Green—optimal air quality ► enjoy the air quality

Orange—moderate air quality ► ventilation suggested

Red—-poor air quality ► ventilation immediately

RS485 interface (option)

Modbus protocol with 19200bps

Operation condition

-20℃~60℃ (-4℉~140℉)/ 0~ 95% RH

Storage conditions

0℃~50℃ (32℉~122℉)/ 5~ 90% RH

Net Weight




Installation standard

Desktop or wall mount (65mm×65mm or 85mmX85mm or 2”×4” wire box)

Wiring standard

Wire section area <1.5mm2

Power supply



2.8 W

Quality System

ISO 9001


PC/ABS fire-proof, IP30 protection




1. Real time monitor ambiance air quality

2. Semiconductor mix gases sensor with 5 year life

3. Gas detection: cigarette smoke, VOCs such as formaldehyde and toluene, ethanol, ammonia, hydrogen sulfide, sulfur dioxide and other harmful gases

4. Monitor temperature and relative humidity

5. Three-color (green/orange/red) LCD backlit indicating air quality at optimal/moderate/poor

6. Preset warning point of buzzer alarm and backlight

7. Provide one relay output to control a ventilator

8. Modbus RS485 communication optional

9. High quality technics and elegant appearance, best choice for home and office

10. 220VAC or 24VAC/VDC power selectable; power adaptor available; desktop and wall mounting type available

11. EU standard and CE-approval


1. Ambiance air quality detection and alarm

2. Ventilation systems

3. Air cleaning systems.

4. Installation place such as bedroom, sitting room, study and dinner room, kindergarten, classroom, office, car, restaurant, and other public places.

Mounting and Dimensions

Wiring Diagram

Product Tags:

multigas detector


voc monitors

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Wall Mount VOC Sensors / Alarm With LCD Display Relay , VOC Gas Detector 1~30ppm Range Images

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