The meter measures CO2 level, air temperature, dew point, wet bulb temperature and humidity and is an ideal instrument for indoor air quality (IAO) diagnosis. Poor indoor air quality is considered unhealthy because it causes tiredness, loss of ability to concentrate, and even illness (ex. Sick Building Syndrome). IAQ monitoring and survey, especially on CO2 level and air ventilation become widely applied in public areas such as offices, classrooms, factories, hospitals and hotels. It is also suggested in regulations of industrial hygiene in some countries. (Appendix) The portable CO2 meter uses NDIR (non-depressive infrared) technology to ensure the reliability and long-term stability. It's useful in verifying HVAC system performance and air ventilation control. The meter is designed with the build-in relay for alarm output. When CO2 readings go over the upper limit it cause alarming. The relay picks up automatically and sends output. It can be connected to a ventilation system or activator for conditioning the air quality. The relay will drop out when CO2 readings fall under the lower limit.

FEATURES

• Digital LCD display
• Triple displays of CO2 level, temperature and humidity
• Dew Point and Wet Bulb temperature measurement
• Stable NDIR sensor for CO2 detection
• Statistics of weighted averages TWA (8 hours weighted average) STEL (15 minutes weighted average)
• MAX /MIN Hold function
• Long time drift compensation
• User’s set up 2 limits CO2
• Visible and Audile CO2 warning alarm
• Alarm output for ventilation control
• Easy manual calibration on CO2 and humidity
• PC connect via RS232 interface
• Adaptor power supply
• Modern housing design

SPECIFICATIONS

Description	Wall mount CO2 Meter
Model	VZ7722
CO2 measurement
Measurement Range	0 to 2000ppm 2001 to 9999ppm
Technology	NDIR – non-depressive infrared technology
Measurement units	PPM
Basic Accuracy	± 50ppm ±5%rdg (0 to 2000 ppm)
Resolution	1ppm
Alarm	80dB audible alarm with reading on the LCD
Temperature
Measurement Range	-10 to 60°C (14 to 140°F)
Measurement units	°C / °F
Basic Accuracy	± 0.6 °C / ± 0.9°F
Resolution	0.1°
Relative humidity
Technology	Rotronic capacitor type
Measurement Range	0 to 99.9%
Basic Accuracy	± 3% (10 to 90%); ± 5% others
Resolution	0.1%
Display	Large triple LCD display
Power type	12 DC Adaptor
Built-in relay	For ventilation control
Port RS232	For on-line logging and data analysis on PC
Product weight	190g
Product dimensions HxWxD	130 x 60 x 85 mm
Operating temp.	0° to 50°C
Humidity range	0% to 99% relative humidity (RH)
Approvals	CE
Accessories	AC/DC adaptor, manual