Uni-T A37 User guide

P/N:110401106683X

A37

Carbon Dioxide Monitor

User Manual

I. Introduction

CO2 is a naturally occurring gas that emitted at great levels by human activity and it is one of several greenhouse gases in our atmosphere. CO 2 only accounts for 0.03% of the fresh air. If you breathe high concentration CO , you may be at risk of carbon dioxide intoxication. Symptoms of

carbon dioxide toxicity include headache, irregular heartbeat, nausea, unconsciousness, or even death.

A37 is a CO Monitor that measures CO concentration, temperature and 2 2 humidity. This monitor is widely used in homes, shopping malls, offices, vehicles, stations etc.

Please read carefully and follow all warnings and precautions before using the device.

II. Open box inspection

Open the box and take out the device. Please check whether the following items are deficient or damaged and contact your supplier immediately if they are.

A37 CO monitor -------------------- 1

Protective case ----------------------- 1 User manual -------------------------- 1 USB cable ----------------------------- 1

III. Safety information

1. Check the device and its accessories for any damage or anomaly before use. Do not use the device if the cover is damaged, or has any other malfunctions.

2. Please follow the operation instructions.

3. Please do not open the device case and modify the internal circuit.

4. Do not store or use this device in high temperature, high humidity, flammable, explosive and strong electromagnetic environments.

5. Charge the monitor when symbol is displayed.

6. Regularly use soft cloth and mild detergent to clean the case. Do not use abradant or solvent.

7. A37 complies with CE standards.

8. This monitor has ABC (Automatic Baseline Correction) function. Do not use this monitor in closed environment where CO concentration 2 remains relatively high.

9. Use specified adapter to charge the device. The adapter should comply with UL/FCC safety standards.

IV. Structure

①: Case ② LCD screen ③ USB port ④ Functional buttons: : :

V.Symbols

6 2

Indication Indication

Audio alarm ON/OFF

STEL/TWA/MAX

/MIN/AVG modes

CO 2 calibration

Timing shutdown

Battery status

Exit calibration

No.No.

CO concentration2

CO 2

grading emoticon

Relative humidity

Date/time

Temperature

Data hold

concentration

VI. Operation instructions

1. Functional buttons

The following table shows the buttons functions in dif ferent modes.

Modes

OFF

Measure

Calibration

2.Operations

CO 2 measurement Long p re ss to turn on the monitor. It ta kes 120s to stab il ize CO2 concentration. concentration, ambient temperature, relative humidity CO2 will be displayed on the screen. concentration value is refreshed CO2 every 3 seconds.

Note: if >1000ppm, buzzer goes off with red backlight flashing. The CO2 audio alarm’s default setting is OFF, long press to turn on the audio alarm.

1)Concentration grading emoticons

Data Short press MODE to cycle switch between HOLD/MAX/MIN/AVG /TWA/STEL values.

Symbol

HOLD

MAX

MIN

AVG

TWA

STEL

Long press: turn on/off the monitor

Long press: enter calibration mode

Short press: turn on/off the backlight

Short press to switch temperature unit ˚C/˚F

Long press to turn on/off audio alarm

Short press: cycle switch between HOLD/MAX/MIN/AVG/TWA/STEL

Long press: reset to zero

Long press: calibrate the CO2 concentration (outdoor fresh air)

Short press: increase the value

Short press : next parameter (double press to enter date/time calibration)

Long press: save

Short press: decrease the value

Short press: previous parameter

Long press: exit calibration

400ppm ~ 450ppm; 450ppm 700ppm; ~ 700ppm 1000ppm; ~ 1000ppm 2000ppm; ~ 2000ppm 5000ppm; ~ 5000ppm以上;

Indication

Data hold

Maximum value

Minimum value

Average value

Time weighted average

Short-term exposure limit

Functions

Buttons

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.

CO2 Note: function has been calibrated before delivery. If the value is CO2

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 standard value.CO2 Warnings: ABC function is always on, do not use this monitor in closed environment where concentration remains relatively high.CO2

Backlight

Operating environment

Storage environment

Power supply

Weight

Dimension

IX. CO2 concentration and effects (only for reference)

Concentration

350~450ppm

350~1000ppm

1000~2000ppm

2000~5000ppm

>5000ppm

√

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

Effect

Fresh air

Normal

Turbid air, sleepy

Headache, irregular heartbeat, nausea

Unconsciousness or even death

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.

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

Function

Temperature

Humidity

*1: Measure environment: 1atm, ambient temperature and humidity *2: It may be influenced by heat emitted by the adaptor

Range

400~5000 ppm

-10.0˚C~50.0˚C

0-99%RH

Resolution

1ppm

0.1˚C

1%RH

2.General specifications

Specifications

Sensor

ABC

Audio alarm

Visual alarm

Display

Low battery indication

Auto power off

Descriptions

NDIR principle

Automatic baseline correction

Buzzer

Red backlight

LCD screen

√

Accuracy

±(5% of rdg+50ppm) from 400~2000ppm *1

±1˚C *2

(10%RH～90%RH) ±5%RH @25˚C