BT-531G CO2 Monitor Air Quality Meter NDIR Sensor 0-10000ppm Temperature Humidity Type-C 2000mAh

BT-531G CO2 Monitor Air Quality Meter NDIR Sensor 0-10000ppm Temperature Humidity Type-C 2000mAh

$289.40

$289.40 $0.00

Description

SPECIFICATIONS

Application Scenarios: Industrial Grade

Battery Capacity: 2000mAh

Battery Included: Yes

Brand Name: HoldPeak

Buzzer Alarm: Yes (built-in)

Certification: CE

Charging Interface: Type-C USB

Choice: yes

DIY Supplies: Electrical

Display: 84 x 69mm big screen VA LCD

Feature 1: NDIR (Non-Dispersive Infrared) sensor for high accuracy

Feature 10: ABS plastic housing

Feature 2: 4-level air quality indicator with color codes

Feature 3: 84 x 69mm large VA LCD display

Feature 4: Built-in audible alarm for high CO2 levels

Feature 5: Type-C fast charging

Feature 6: 2000mAh large capacity battery

Feature 7: Temperature and humidity 2-in-1 measurement

Feature 8: Handing hole for portable carrying

Feature 9: Rear bracket for table placement

Gas Type: Co2

High-concerned chemical: none

Is Smart Device: no

Measurement Range: 0 - 10000 ppm

Model Number: BT-531G

Operating Temperature: -10°C - 50°C (14°F - 122°F)

Origin: Mainland China

PCBincluded: Yes

Semi-finishedproduct: No

Sensor Type: NDIR (Non-Dispersive Infrared)

Suitable For: Office, living room, baby room, car, greenhouse, classroom, warehouse, workshop, sauna, farm, school

Type: Carbon Dioxide Detector

With LCD Screen Or Not: Yes

semi_Choice: yes

BT-531G CO2 Monitor – Air Quality Meter with NDIR Sensor, 0-10000ppm, Temperature, Humidity, Type-C Charging, Audible Alarm

The BT-531G carbon dioxide detector is a professional indoor air quality monitor for measuring CO2 concentration, temperature, and humidity. It features a high-precision NDIR (Non-Dispersive Infrared) sensor with >10 years lifespan, 4-level air quality classification (Good/Normal/Poor/Serious), built-in audible alarm, 84×69mm large VA LCD display, Type-C charging, and 2000mAh rechargeable battery. Ideal for office, living room, baby room, car, greenhouse, classroom, warehouse, workshop, sauna, farm, and school.

Core Features:

CO2 measurement – 0 – 10000 ppm range, 1 ppm resolution

NDIR sensor – high selectivity, fast response, good stability, high precision

4-level air quality indicator – Good / Normal / Poor / Serious

Built-in audible alarm – slow beep ≥2000ppm, fast beep ≥5000ppm

Temperature measurement – -40°C to 80°C / -40°F to 176°F (°C/°F switchable)

Humidity measurement – 0.1% – 99.9% RH

84×69mm large VA LCD display – clear and easy to read

Type-C charging port – faster charging

2000mAh rechargeable battery – built-in, ~4 hours operating time

Handing hole – easy to carry

Rear bracket – stable table placement

ABS plastic housing – durable

NDIR (Non-Dispersive Infrared) Sensor – High Accuracy & Long Life

The BT-531G CO2 meter uses advanced NDIR sensor technology for reliable carbon dioxide detection.

Sensor Feature Advantage
Selectivity High – specifically detects CO2
Response speed Fast – quick readings
Signal-to-noise ratio High – clean, accurate signal
Stability Good – consistent performance
Precision High – accurate measurements
Sensor life >10 years – long-term use
CO2 detection specifications:

Parameter Value
CO2 range 0 – 10000 ppm
CO2 resolution 1 ppm
Detection accuracy ±(5% of display + 50ppm)
Conformity accuracy ±20%
Sensor type NDIR (Non-Dispersive Infrared)
Sensor life >10 years

4-Level Air Quality Classification – Easy to Understand

The BT-531G air quality monitor automatically classifies CO2 levels into 4 categories.

Level CO2 (ppm) Air Quality Indicator
Good 0 – 999 ✅ Air quality is good Green
Normal 1000 – 1999 ⚠️ Air quality is normal Yellow
Poor 2000 – 4999 🔴 Air quality is poor Orange/Red
Serious 5000 – 9999 ❌ Air quality is serious Dark Red
CO2 impact on human health (reference):

CO2 (ppm) Effect on People
300 – 450 ppm Outdoor air in general
450 – 1000 ppm Air is fresh and smooth
1000 – 2000 ppm Air becomes turbid, drowsiness
2000 – 5000 ppm Headache, sluggishness, unable to concentrate, heartbeat accelerates, feel sick
>5000 ppm Brain injury, lose consciousness, even stun

Intelligent CO2 Warning Alarm – Stay Safe

The BT-531G CO2 detector features a built-in buzzer that alerts you when CO2 levels become dangerous.

Condition Alarm Indication
CO2 ≥ 2000 ppm (Poor) Slow beep Ventilate the area
CO2 ≥ 5000 ppm (Serious) Fast beep Leave immediately
Benefits of audible alarm:

No need to constantly watch the display

Immediate awareness of dangerous conditions

Perfect for classrooms, offices, and baby rooms

Temperature & Humidity Measurement – Complete Environmental Monitoring

The BT-531G indoor air quality meter measures temperature and humidity alongside CO2.

Temperature specifications:

Parameter Value
Range -40°C – 80°C / -40°F – 176°F
Resolution 0.1°C / 0.1°F
Accuracy ±2°C (±3.6°F)
Unit switch °C / °F (press button)
Humidity specifications:

Parameter Value
Range 0.1% – 99.9% RH
Resolution 0.1%
Accuracy ±10.0%
3-in-1 function:

CO2 concentration

Temperature

Relative humidity

84×69mm Big Screen VA LCD – Clear at a Glance

The BT-531G CO2 monitor features a large, easy-to-read VA LCD display.

Display Feature Description
Screen size 84 × 69 mm
Display type VA LCD (high contrast, wide viewing angle)
Information shown CO2 (ppm), Temperature (°C/°F), Humidity (%RH)
Air quality indicator 4-level color-coded bar
Battery indicator Shows remaining power
Display layout:

CO2 value – large digits (primary focus)

Temperature – lower left

Humidity – lower right

Air quality level – color bar at top

2000mAh Rechargeable Battery – Type-C Fast Charging

The BT-531G air quality tester features a built-in 2000mAh lithium battery with Type-C charging.

Battery specifications:

Parameter Value
Battery type Built-in 3.7V Lithium battery
Battery capacity 2000mAh
Charging time Approx. 2 hours
Operating time Approx. 4 hours
Charging interface Type-C USB
Charging input DC 5V
Charging indicators:

Red LED – battery charging

Green LED – charging complete

Low battery indication:

Battery symbol appears on LCD

Charge via Type-C cable when low

⚠️ Important: Use standard DC-5V power adapter only. Do not use higher voltage chargers.

Technical Specifications – BT-531G CO2 Monitor

Parameter Value
Brand BTMETER
Model BT-531G
Product name CO2 Monitor / Air Quality Meter
Display 84×69mm VA LCD
CO2 Detection:

Parameter Value
Range 0 – 10000 ppm
Resolution 1 ppm
Accuracy ±(5% of display + 50ppm)
Sensor type NDIR (Non-Dispersive Infrared)
Sensor life >10 years
Operating temp -10°C – 50°C
Operating humidity 0% – 95% RH (non-condensing)
Temperature:

Parameter Value
Range -40°C – 80°C / -40°F – 176°F
Resolution 0.1°C / 0.1°F
Accuracy ±2°C (±3.6°F)
Humidity:

Parameter Value
Range 0.1% – 99.9% RH
Resolution 0.1%
Accuracy ±10.0%
General:

Parameter Value
Alarm Built-in buzzer (≥2000ppm slow, ≥5000ppm fast)
Power supply Built-in 3.7V Li-ion, 2000mAh
Charging Type-C USB, DC 5V
Charging time ~2 hours
Operating time ~4 hours
Material ABS plastic
Dimensions 128 × 90 × 37 mm
Weight Approx. 230g (including battery)

Wide Range of Applications – Indoor Air Quality Monitoring

The BT-531G professional CO2 detector is perfect for:

Scenario Application
Office Monitor CO2 levels for productivity and health
Living Room Daily air quality tracking
Baby Room Ensure safe breathing environment for infants
Car Check in-vehicle CO2 during long drives
Greenhouse Monitor CO2 for plant growth
Classroom Maintain healthy learning environment
Warehouse Air quality monitoring for workers
Workshop Ensure safe working conditions
Sauna Monitor air quality in enclosed spaces
Farm Check CO2 in animal housing
School Protect students and staff

Important Usage Tips – Ensure Accurate Readings

Do's ✅

Guideline Reason
Allow 1 minute for initial reading Sensor needs time to stabilize
Allow 5 minutes for fully stable reading Best accuracy after warm-up
Keep air inlet/outlet unobstructed Proper airflow for detection
Use standard DC-5V charger only Prevents damage
Store in clean, dry environment Prolongs device life
Don'ts ❌

Guideline Reason
Don't use in dusty environment frequently Prolongs sensor life
Don't use in high temperature/humidity beyond spec May cause inaccurate readings
Don't use near strong magnetic fields May cause measurement errors
Don't insert sharp objects into air inlet/outlet May damage sensor
Don't disassemble by non-professionals Internal circuit damage risk
Don't expose to moisture or rain May cause circuit failure
Operating tips:

Place device at breathing height (approx. 1.2-1.5m from floor)

Avoid placement near windows, doors, or air vents

For continuous monitoring, use rear bracket for stable placement

Battery care:

Charge battery every 3 months for long-term storage

Low battery symbol indicates need for charging

Package List – What's in the Box

Item Quantity
BT-531G CO2 Monitor 1
Type-C USB Charging Cable 1
Screwdriver 1
User Manual 1
⚠️ Important Notes:

Item Status
Battery ✅ Included (built-in 2000mAh rechargeable)
USB charger ❌ Not included (use standard 5V phone charger)
Type-C cable ✅ Included
Screwdriver ✅ Included
Before first use checklist:

Charge device fully via Type-C (red → green light)

Power on (press and hold POWER key >3 seconds)

Allow 1 minute for initial CO2 reading

Allow 5 minutes for fully stabilized reading

Press °C/°F button to select desired temperature unit

Model: BT-531G – Professional CO2 Monitor with NDIR Sensor, 0-10000ppm, Temperature, Humidity, Type-C Charging, Audible Alarm

Applications: Office, living room, baby room, car, greenhouse, classroom, warehouse, workshop, sauna, farm, school

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