SMART SENSOR AS8700A Carbon Monoxide Detector User Manual

1. Introduction

The SMART SENSOR AS8700A is a portable carbon monoxide (CO) gas detector designed for continuous monitoring of CO gas concentration in the surrounding environment. This high-precision, compact, and lightweight device is easy to carry and operate, making it suitable for various industrial and domestic applications. It provides both visual (LCD display) and audible/light alarms when CO concentration reaches dangerous levels.

The meter indicates the percentage of carbon monoxide in two ways: PPM reading on the LCD display and a beeper tone.

Typical applications include:

Carbon monoxide detection in gas pipelines.
Car exhaust carbon monoxide detection.
Carbon monoxide detection in underground mines.
Industrial waste carbon monoxide detection.

Applications of the CO detector — Figure 1: Various applications for the Carbon Monoxide Detector.

2. Safety Information

WARNING: Do not use this meter as a personal safety monitor. This device is for detection and measurement purposes only.

It is crucial to understand and recognize the effects of CO poisoning:

CO Concentration (PPM)	Effects
0-1 PPM	Normal background level
9 PPM	ASHRAE Standard 62-1989 for living areas
50 PPM	OSHA enclosed space 8 hours average level
100 PPM	OSHA exposure limit
200 PPM	Mild headache, fatigue, nausea, and dizziness
800 PPM	Dizziness, nausea, and convulsions. Death within 2 to 3 hours

U.S. Department of Labor, Occupational Safety & Health Administration (OSHA) Regulation 1917.24 states: The CO concentration in any enclosed space shall be maintained at not more than 50 PPM (0.05%). Remove employees from enclosed space if the CO concentration exceeds 100 PPM (0.01%).

3. Product Features

Portable detector for detecting carbon monoxide (CO) gas.
Continuous monitoring of CO gas concentration.
Sound and light alarms when CO concentration reaches the preset alarm level.
Compact size and lightweight design for easy portability and operation.
Professional and accurate measurement with a high-sensitivity electrochemical sensor.
Large LCD display with HD backlight for clear readings.
Temperature measurement in Celsius (℃) or Fahrenheit (℉).
Adjustable alarm value settings.
Data Hold function to freeze readings.
MAX Hold function to capture maximum readings.
Auto power off after 30 minutes of inactivity to conserve battery life.

Icons representing key features of the CO detector — Figure 2: Visual representation of key features including high sensitivity sensor, data hold, alarm settings, unit conversion, HD backlight, and light/sound alarm.

4. Product Diagram and Components

Diagram of the Carbon Monoxide Meter with labeled parts — Figure 3: Front view of the AS8700A Carbon Monoxide Meter with labeled components.

Power Display: Indicates current battery level.
LCD Display: Shows CO concentration (PPM) and temperature.
Reading: Digital display of CO concentration.
Temperature Value: Digital display of ambient temperature.
ON/OFF Button: Powers the device on or off.
Mode Button: Used for various mode selections (e.g., alarm value settings).
°C/°F Switch Button: Toggles between Celsius and Fahrenheit temperature units.
Backlight Button: Activates or deactivates the LCD backlight.

Side view of the CO detector showing the sensor cap — Figure 4: Side view of the detector, highlighting the sensor area.

Close-up of the high sensitivity electrochemical sensor — Figure 5: Detail of the advanced high-sensitivity electrochemical sensor.

5. Specifications

Parameter	Value
Brand Name	SMART SENSOR
Model Number	AS8700A
Gas Type	CO (Carbon Monoxide)
Sensor Type	Stabilized Electrochemical Gas Specific (CO)
Measurement Range (CO)	0 to 1000 PPM
Resolution (CO)	1 PPM
Accuracy (CO)	±5% or ±10 PPM
Temperature Measurement	Ambient Temperature
Measurement Range (Temperature)	0～50℃ / 32～122℉
Resolution (Temperature)	0.1℃ / 0.1℉
Accuracy (Temperature)	±1.5℃
Response Time	<60 seconds
Alarm Type	Sound & Light Alarm
Alarm Point	24 PPM Preset (Adjustable)
Warm-up Period	<60 Seconds
Power Supply	3 * AAA 1.5V Alkaline Batteries (NOT Included)
Operating Temperature	0℃～+50℃ (1%RH～99%RH non-condensing)
Storing Temperature	-30℃～+60℃ (1%RH～99%RH non-condensing)
Auto Power Shut Off	After 30 minutes without operation
Typical Sensor Life	3 years
Item Size	Approx. 135 * 50 * 35mm / 5.31 * 1.97 * 1.38in (L * W * H)
Item Weight	Approx. 89g / 3.13oz
Certification	CE, FCC

Dimensions of the Carbon Monoxide Meter — Figure 6: Physical dimensions of the AS8700A detector.

6. Setup

6.1 Battery Installation

The device requires 3 AAA 1.5V alkaline batteries (not included).

Locate the battery compartment on the back of the device.
Open the battery door.
Insert 3 AAA batteries, ensuring correct polarity (+/-).
Close the battery door securely.

When the battery power is low, the battery indicator will appear on the LCD display. Replace with new batteries promptly.

Battery compartment of the CO detector — Figure 7: Open battery compartment for AAA battery installation.

7. Operating Instructions

7.1 Power ON/OFF

To turn on the meter, press the Power ON/OFF button. The device will immediately begin measuring CO concentration. The indicator "SCAN" will appear on the LCD display.
To turn off the meter, press the Power ON/OFF button again.

7.2 Data Hold

The Data Hold function allows you to freeze the current reading on the display for reference.

To activate, press the HOLD button. The indicator "HOLD" will appear on the LCD display.
To return to normal operation, press the HOLD button again.

7.3 MAX Hold

The MAX Hold function captures and displays the maximum CO reading detected.

To activate, press the MAX button. The indicator "MAX" will appear on the LCD display, and the reading will lock to the maximum value detected.
To return to normal operation, press the MAX button again.

7.4 Backlight

The LCD display features a backlight for improved visibility in low-light conditions.

To turn on the backlight, press the Backlight button.
To turn off the backlight, press the Backlight button again.

HD Backlight Display of the CO detector — Figure 8: The HD backlight display for clear readings.

Temperature unit conversion on the CO detector — Figure 9: Switching between Celsius and Fahrenheit temperature units.

8. Alarm Functionality

The meter indicates the CO level through its LCD display and a beeper tone. The beeper's behavior changes based on the CO concentration:

From 30 PPM to 200 PPM: The beeper sounds discontinuously.
Above 200 PPM: The beeper sounds continuously.

The alarm point is preset to 24 PPM but can be adjusted via the Mode button (refer to the full user manual PDF for detailed instructions on adjusting alarm values).

Light and Sound Alarm indicators — Figure 10: Visual representation of the sound and light alarm features.

9. Maintenance

9.1 Battery Replacement

When the low battery indicator appears on the LCD display, replace the batteries as described in the "6.1 Battery Installation" section.

Important: If the unit will not be used for a long period, remove the batteries to prevent damage from battery leakage.

9.2 Cleaning

Wipe the device with a soft, dry cloth. Do not use abrasive cleaners or solvents.

10. Troubleshooting: Common CO Sources and Appliance Malfunctions

High levels of carbon monoxide can be caused by various issues. The following table identifies typical problems:

Appliance	Fuel	Typical Problem
Gas furnaces (Room heaters)	Oil, natural gas, or LPG (liquefied petroleum gas)	Cracked heat exchanger Not enough air to burn fuel properly Defective / blocked flue Maladjusted burner Building not properly pressurized
Central heating furnaces	Coal or Kerosene	Cracked heat exchanger Not enough air to burn fuel properly Defective grate
Room heaters	Kerosene	Improper adjustment Wrong fuel (not K-1) Wrong wick or wick height Not enough air to burn fuel System not properly vented
Water heaters	Natural gas or LPG	Not enough air to burn fuel properly Defective / blocked flue Maladjusted burner Building not properly pressurized
Ranges, Ovens	Natural gas or LPG	Not enough air to burn fuel Maladjusted burner Misuse as a room heater System not properly vented
Stoves, Fireplaces	Gas, wood, coal	Not enough air to burn fuel properly Defective / blocked flue Green or treated wood Cracked heat exchanger Cracked firebox

11. User Tips

No specific user tips were available from provided reviews or Q&A content.

12. Warranty and Support

For detailed warranty information and further support, please refer to the official user manual PDF provided by the manufacturer. A digital copy of the user manual can be accessed here.

For product inquiries or technical assistance, please contact the seller or manufacturer directly.