Detail LUTRON GCH-2018 CO2 METER :

• NDIR method principal for CO2 (Carbon dioxide) measurement, available for long term operation
• High repeatability and high accuracy
• Two probes, one is for CO2/Temp. measurement, the other probe is for humidity/Temp./Dew point measurement
• Separate probe, easy operation and convenient for remote measurement
• CO2 function with alarm setting
• Can set the altitude (height) value with default for compensation
• Humidty measurement with fast response time
• Large S-TN LCD, high contrast, easy readout
• Data hold function to freezing the desired value on display
• Records maximum and minimum readings with recall
• RS232/USB computer interface
• Microprocessor circuit assures maximum possible accuracy, provides special functions and features
• Heavy duty and compact housing with hard carying case, designed for easy carry out and operation
• Auto shut off is available to save battery life
• Power suppy from batteries or DC 9V adapter in

SPECIFICATIONS :

1. Circuit : Custom one-chip of microprocessor LSI circuit
2. Display :
   LCD size : 52×38 mm
   dual function LCD display
3. Measurement : CO2 (carbo dioxide), temp. Humidity, dew point, Temp.
4. Unit :
   CO2 : ppm
   Humidity : % RH
   Dew point : ℃ ℉
   Temp : ℃ ℉
5. Response time : CO2
   < 2 Min. typically
   * Reach the 63% reading value
   * Depend the environment air circulation
6. CO2 Altitude (Height) value setting : 0 to 9.000 meters (For precision measurement, it need to set the mete’s environment altitude (height) value for the compensation)
7. Temp. compensation : Automatic temp. compensation
8. Advanced setting :
   Auto power off enable/disable setting
   ℃ ℉ setting
   CO2 alarm value setting
   CO2 altitude value setting
9. Alarm setting : For CO2 measurement only
10. Data hold : Freeze the display reading
11. Memory recall : maximum and minimum value
12. Display sampling time : Approx. 1 second
13. Power off : Auto shut off saves battery life. Or manual off by push button
14. Data output : RS 232/USB PC serial interface
    *Connect the optional RS232 cable
    UPCB-02 will get the RS232 plug
    * Connect the optional USB cable
    USB-01 will get the USB plug
15. Probes no. Two probes :
    * Probe 1 is for CO2 temp. measurement
    * Probe 2 is for humidity, Dew point. Temp Measurement
16. Operating temp : 0 to 50 ^◦C
17. Operating humidity :
    Main instrument : Less than 85 % R.H
    CO2 probe : Less than 85% RH
    Humidity measurement : 0 to 95% RH
18. Power supply : 1.5 V battery (UM-3, AA) x 6 PCs,  or equivalent
19. Power current :
    CO2 measurement :
    *Approx. DC 9.6 mA for 90% period
    * Approx. DC 128 mA 10% period
    Humidity measurement  : Approx. DC 5.6 mA
20. Weight :
    Main instrument : 372g/0.82 LB (Including battery)
    CO2 probe : 158g/0..35 LB
    Humidity probe : 82g/0.18 LB
21. Dimension :
    Main instrument : 173x68x42 mm
    CO2 probe : 185x38x26 mm
    Humidity probe : 200x23x19 mm