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TWA: The average exposure within the workplace to any hazardous
contaminant or agent using the baseline of an 8 hour day or 40 hours
week work schedule.
STEL: The acceptable exposure limit to a toxic or irritant substance over
a short period of time (time-weighted average), usually 15 minutes.
Auto shutdown
The monitor will automatically shut down if there is no operation for 2 hours.
Backlight
Please refer to Operation Instructions-Functional Buttons
Audio alarm
Please refer to Operation Instructions-Functional Buttons
Temperature unit
Please refer to Operation Instructions-Functional Buttons
Battery
Charge the battery when
is displayed on the screen. It takes 2~3 hours
to fully charge the battery.
3.Calibration
Date/time
Please refer to Operation Instructions-Functional Buttons to calibrate
date/time.
CO
2
Note:
CO
function has been calibrated before delivery. If the value is
2
greatly deviated from the standard, you can calibrate it by either methods
below:
1) Automatic calibration
A37 has the built-in self-correcting ABC (Automatic Baseline Correction)
algorithm to automatically adjust the base value.
a) Turn on the monitor and leave A37 at a place where there is flowing
fresh air for 3 days (powered by the adaptor)
b) ABC function will automatically adjust and correct the
Warnings: ABC function is always on, do not use this monitor in closed
environment where
CO
concentration remains relatively high.
2
2) Manual calibration
a) Turn on the monitor, leave it outdoor for 20 minutes
b) Long press
until
appears on the screen. Calibration takes
10 minutes.
symbol disappears when calibration is done.
Note: It is suggested to calibrate the monitor in outdoor environments
where there is air flow. Keep device away from animals, plants and human.
VII. Specifications
1.Technical specifications
Range
Function
Resolution
400~5000 ppm
1ppm
Temperature
-10.0˚C~50.0˚C
0.1˚C
Humidity
0-99%RH
1%RH
*1: Measure environment: 1atm, ambient temperature and humidity
*2: It may be influenced by heat emitted by the adaptor
2.General specifications
Descriptions
Specifications
NDIR principle
Sensor
ABC
Automatic baseline correction
Audio alarm
Buzzer
Red backlight
Visual alarm
Display
LCD screen
√
Low battery indication
Auto power off
√
Backlight
Operating environment
Storage environment
Power supply
Weight
Dimension
IX. CO
Concentration
350~450ppm
350~1000ppm
1000~2000ppm
2000~5000ppm
>5000ppm
X. Maintenance
a.The maintenance and service of the device must be implemented by
qualified professionals or the designated departments.
b.Regularly use dry cloth to clean the cover. Do not use the detergent
containing solvent composition
c.To conserve battery, please turn off the device if do not being used for
a long time.
CO
standard value.
2
Accuracy
±(5% of rdg+50ppm)
from 400~2000ppm *1
±1˚C *2
(10%RH～90%RH)
±5%RH @25˚C
√
0˚C~50 C, 0%RH~85%RH
˚
-20 C~60 C, 0%RH~95%RH
˚
˚
Built-in 3.7V DC rechargeable battery
195g
75mm x 55mm x 130mm
concentration and effects (only for reference)
2
Effect
Fresh air
Normal
Turbid air, sleepy
Headache, irregular heartbeat, nausea
Unconsciousness or even death
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