Hygrometer (ST501)

Features :
- 3 independent CO2, humidity and temperature sensors
- User operated CO2 calibration 
- Data logging-up to 50,000 records
- Fast USB download (50,000 records in less than 10 seconds)
- Internal back-up battery to maintain data/time data 
- Power management IC to increase battery efficiency 
- Easy-to-use PC software or parameter settings and data analysis
- Building-in audio CO2 buzzer/alarm  

Specifications :  
- CO2 Sensor - GE dual beam absorption infrared 
- Temperature / humidity sensors 
- Measurement range : 0 to 5,000 ppm display 
- Display resolution : ±1ppm 
- Accuracy : ±75ppm or 10% of reading (whichever is greater)  

Application :
- Building HVAC monitoring 
- Indoor air quality survey 
- Locate the presence of combustion fumes from vehicles and appliances

General :
- Operation condition : 32 to 122°F (0 to 50°C), 0 to 95% RH, Non-Condensing 
- Storage temperature : -4 to 140°F (-20 to 60°C)

Sensors :
CO2 sensor :
- Type : Non-dispersive infra-red (NDIR )
- Measurement range : 0 to 5,000 ppm display
- Accuracy : ±75ppm or 10% of reading (whichever is  greater)
- Resolution : ±1 
- Response time : 2 seconds

Relative humidity sensor :
- Type : Cmos 
- Measurement range : 10 to 90%
- Accuracy : 2.5%
- Resolution : 0.1% 
- Response time : 8 seconds

Temperature Sensor : 
- Type : Thermistor 
- Measurement range : -80 to 75°C
- Accuracy : ±0.2°C from 0 to 70°C 
- Resolution : 0.1°C
- Response time : 1 second

Power Supply : 
- Battery : Four AA batteries 
- Battery operation : 24 hours
- External power supply : 6 V DC With 0.5A 

User guide for hygrometer ST501 

Note : All the above descriptions are subject to change without notice

Country of origin : Taiwan.

Warranty : 1 year against manufacturing defects.
Remarks : For warranty claim :-
                1) There is NO one to one exchange.
                2) Unit need to sent back to manufacturer for rectification & repair.

Delivery : 3 to 5 days (in-stock unit) else 2 to 4 weeks (pre-order unit) subject to factory confirmation