CO2 Sensor

Model Number

GHFS4x-Pxxx

CDO Sensor(Carbon dioxide) - for the detection of CO₂

Features

• High selectivity to CO₂
• Long-term stability
• Low dependency on humidity & temperature

Applications

• Air quality control
  
• Agriculture & fermentation process control
  
• Ventilator
  

-General-
Application : It is applied detection of carbon dioxide(CO2) gases for Air Conditioner and Ventilation with installing Electric ?Electron Machine

Operation Rage

• Working Temperature : -10°C ~ 60°C
  
• Working Humidity : below saturation point
  
• Storage Temperature : -20°C ~ 70°C
  

1. Sensitivity characteristic slope for Sensor

2. Basic Measuring Circuit

3. Sensor Characteristics

Model number			GHFS41	GHFS42	Remark
Sensing element type			Solid electrolyte
Target gas			Co2(Carbon dioxide)
Measuring range			(200~30,000ppm)
Electrical characteristics under standard test conditions	RH	Heater resistance	12.8Ω±0.3Ω
	VH	Heater voltage	5.0V±0.05V
	PH	Power consumption	Less than 680mW
	EMF	Electromotive force	280~320mV in 400ppm CO2		Rank
	Amp	Amplifying	Upper 100GΩ
Sensor characteristics (after gas saturation)	Response time(T90)		Reaction : less than 5sec Recovery : less than 10sec
	Beginning stability time(T95)		Less than 60minute
	Sensitivity slope(β)		50~60		Rank
	Accuracy		±10% at the concentration
	Resolition		1%
Temp. sensor (Platinum RTD)	Sensor resistance		35~45Ω(at25°C)	None
	Measuring current		Less than 1mA
	TCR(Resistance slope)		3840ppm/-k
Environmental Condition	Standard test condition (balance gas : clean air, or special gas) ㆍTemp. : 20°C±2°C, ㆍ Humidity : RH65%±5%, ㆍ Pressure : 1atm ㆍTest chamber : more than 50ℓ, ㆍ Pre-heating time : more than 24hr
	* Storage temp. & Relative humidity : -20°C to 70°C, less then dew point * Oxygen concentration : 21% ± 10%(The sensitivity characteristics are independent by variation in oxygen concentration
Dependenxy of Temperature(Outside temp.) Ratio (%) = -2.481+ 0.124?t), t=Temp. Real EMF = (Out EMF) ?{1- (Ratio/100)}

4. Specifications

4.1 Characteristics

4.2 Sensor Installation(refer to specification)
This will show you how to perform steps for installation

• Select a mounting location with clean air environment, when you test.
  
• Keep away from ventilation inlets, doors and windows.
  
• When you connect power, the out signal is displayed high concentration and then that is gradually getting stabilized within about 60minutes.

5. External output

5.1 Dimensions(straight)

5.2 Function

Calibration(refer to specification)
[Front side]
VR1 : Offset Calibration)
VR2 : Gain Calibration
[Rear side]
R5 : Temp. compensation cal.(Only GHFS41)

5.3 Standard Slope

5.4 Output Data(standard data at 20°C)
-We will support datasheet according to customers
-The table is part of datasheet in case of 2,000ppm

5.5 Specification of customer
-Using concentration Range
-Amplifying Rate

5.6 Reaction time(T90)

Reaction Time(T90) : Less then 5sec[Between EMFair & EMFgas]
* Recovering Time(T90) : Less then 10sec[Between EMFgas & EMFair]
* Beginning stability time(T95) : Less then 60 min.
* Standard test conditions
Test gas condition : CO2 in air at 20±2°C, 65±5%RH
Circuit condition : VH = 5.0±0.05V DC
Conditioning period before test : 2 days

6. Product Code

Characteristics of CIrcuit

Sensing concentration

Shape of terminal

7. Others
In case of requirement for detail data, we will provide "specification"