II. INTRODUCTION
General Description
The meter is a handheld meter to measure ambient
Temperature (℃/℉), Relative Humidity (%RH) and Carbon
Dioxide (CO
2
, ppm). An CO
2
NDIR sensor in the top of the
meter measures gas content by diffusion through sensing
holes. The meter sensing holes are on the top of the
instrument case. The meter measures carbon dioxide
concentration by relying on one of the natural properties of
CO
2
molecules. CO
2
molecules absorb light at a specific
wavelength. High concentrations of CO
2
molecules absorb more
light than low concentrations. This technique is called
non-dispersive infrared (NDIR) detection.
Don’t exhale into sample air
When measuring ambient air, do not exhale into air
surrounding the meter! Your breath contains 40,000 PPM CO
2
.
While it won‟t hurt the meter sensor, it doesn‟t take much to
throw your reading off.
When taking measurements, place the meter in the mixed air
that desire to measure. In this way, you won‟t contaminate the
gas measured by the instrument with your breath. Up high,
near the return vent might be a good spot. On a table
surrounded by people looking at the meter (and breathing on
it) would be a very bad spot.
III. SPECIFICATIONS
General Specifications
Display : LCD triple display.
Display Rate : One time per second.
Low Battery Indication : The “
” is displayed when the battery
voltage drops below the operating voltage.
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Power Supply : Six (6) AAA-size alkaline (large current) batteries.
Regulated AC adapter.
Battery Life : Approx. 8 hours by using alkaline (large current)
batteries (without backlight or Alarm function).
For long time datalogging, please use AC adapter.
Manual Data Memory Capacity : 99 sets.
Auto Datalogging Capacity ; 20,000 sets (maximum 99 blocks)
Operating Temperature Range : 5℃ to 50℃ (41℉ to 122℉)
Storage Temperature Range : -10℃ to 60℃ (-14℉ to 140℉)
Operating Humidity Range : 10%RH to 90%RH, non-condensing.
Storage Humidity Range : 10%RH to 90%RH, non-condensing.
Dimensions : 158 (L)x72(W)x35(H)mm, (6.22”x2.83”x1.38”)
Weight : approx. 255g (including batteries)
Accessories : Instruction Manual, Battery, AC Adaptor,
Software CD Rom & RS232 Cable.
Electrical Specifications
CO
2
Specifications :
Sensing Range : 0 to 6000ppm
Sensing Resolution : 1ppm
Accuracy : @ 101.4 kPa (29.92 inHg) and @ 25℃(77℉)
3% of reading or 50ppm, whichever is greater.
Sensing Method : Dual wavelength detector with non-
dispersive infrared (NDIR) sensor.
Gas Sampling Mode : Diffusion.
Warm up time : 10 seconds.
Response time : < 10 minutes in still air.
Temperature Coefficient : Add 0.36% of reading per ℃
(0.2% of reading per ℉) away from calibration temperature.
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