1. Introduction
The Lepmerk WT8812 Compound Gas Monitor is designed for reliable and accurate detection of multiple gases, including Combustible Gas (LEL), Oxygen (O2), Hydrogen Sulfide (H2S), and Carbon Monoxide (CO). It features high-quality sensors, excellent sensitivity, and stable performance, making it suitable for safety monitoring in various industrial environments. The device is constructed with high-strength engineering plastics and compound non-slip rubber, ensuring durability, dust-proof, and explosion-proof capabilities.
2. Product Overview
The WT8812 monitor is equipped with an LCD display for real-time data and system status, along with various buttons for operation. It features multiple gas sensing holes and an alarm system.
Package Contents:
- 1 x WT8812 Compound Gas Monitor (with Alligator Clips)
- 1 x Charging Cable
- 1 x Charger
- 1 x Transparent Trachea
- 1 x Cover (with Screws)
- 1 x Carrying Box
- 1 x User Manual (English)
3. Setup
- Unpacking: Carefully remove all items from the carrying box. Verify that all components listed in the package contents are present.
- Initial Charge: Before first use, fully charge the device using the provided charging cable and charger. The charging time is approximately 4 hours.
- Power On: Press and hold the On/Off button to power on the device. The sensor will preheat during a countdown.
- Environmental Acclimation: After turning on, allow the unit to remain in the air for a short period to ensure its body temperature is slightly higher than the environmental temperature, which aids in accurate calibration.
4. Operating Instructions
4.1 Gas Measurement
- The device displays real-time gas concentrations on the LCD screen.
- The refresh frequency for readings is 1Hz.
- Important: Do not charge the device while measuring flammable gases, as this may pose an explosion risk.
4.2 High/Low Alarm
- The monitor has 4 default high/low alarm values.
- Alarms are indicated through 4 forms: LCD display, LED light, sound, and vibration.
- The alarm voice can be turned off if desired, while other indications remain active.
4.3 Data Record
- The device can record up to 1000 pieces of data.
- The default data recording interval is 5 seconds, which can be adjusted in the settings.
- Setting the interval to 0 seconds will disable the data record function.
- The 'Delete' operation will remove all recorded data.
4.4 Temperature Display
- The temperature unit can be set to either Celsius (℃) or Fahrenheit (℉). The default unit is Celsius (℃).
4.5 Automatic Turning Off
- The unit is set to automatically turn off after 30 minutes of inactivity (no button operations). This function is enabled by default.
4.6 Battery Management
- When the battery indicator shows the last bar or less, it is strongly recommended to charge the unit.
- Operating the unit with a low battery, especially when measuring flammable gases, is prohibited due to potential measurement errors or explosion risks.
- A low battery may cause the unit to turn off automatically.
- Charging time: Approximately 4 hours.
- Discharging time (standby): More than 8 hours (may vary with active use).
4.7 MAX/MIN/Hold Reading
- Press the designated button to calculate and display the maximum (MAX), minimum (MIN), or hold the current reading.
5. Maintenance
5.1 0-Point Calibration
- It is recommended to perform a 0-point calibration monthly or whenever a zero shift is observed, to ensure measurement accuracy.
- Ensure the battery level is above 2 bars before initiating calibration.
- Place the unit in a clean air environment for a period after turning it on to allow its body temperature to slightly exceed the ambient temperature, which is crucial for accurate calibration.
5.2 Temperature Compensation
- The device automatically compensates measured data within the temperature range of -20℃ to 50℃ to maintain accuracy.
5.3 Cleaning
- The device is designed to be dust-proof. For general cleaning, wipe the exterior with a soft, dry cloth. Do not use abrasive cleaners or solvents.
6. Troubleshooting
6.1 Software Error
- If the unit crashes or turns off unexpectedly, it indicates a software error during operation.
- To reactivate the unit, press the On/Off button.
6.2 Low Battery
- If the unit turns off automatically or displays a low battery warning, recharge it immediately. Refer to section 4.6 for battery management.
7. Specifications
| Measuring Item | Unit | Range | Resolution |
|---|---|---|---|
| Combustible gas LEL | %LEL | 0~100 | 0.1 |
| Oxygen O2 | %VOL | 0~30 | 0.1 |
| Hydrogen sulfide H2S | PPM | 0~100 | 0.1 |
| Carbon monoxide CO | PPM | 0~1000 | 1 |
| Accuracy | ≤±5%FS | ||
| Response Time (90%) | Less than 30 seconds | ||
| Indication Mode | LCD displays real-time data and system state, LED, sound, vibration indication alarm | ||
| Storage Conditions | Temperature: -10~55℃; Humidity: <85%RH | ||
| Operation Conditions | Temperature: -20~50℃; Humidity: <95%RH non-condensing | ||
| Working Voltage | DC3.7V (Lithium battery capacity 1800mAh) | ||
| Charging Time | 4h | ||
| Standby Time | More than 8h on end (slightly change with working state) | ||
| Material | ABS | ||
| Item Size | 153 * 71 * 49 mm / 6.02 * 2.79 * 1.93 inch | ||
| Item Weight | 219g / 7.72oz | ||
8. User Tips
- Regular Calibration: To ensure the highest accuracy, perform the 0-point calibration monthly or whenever you suspect a deviation in readings.
- Battery Awareness: Always ensure the device is adequately charged before critical measurements, especially in environments with flammable gases.
- Alarm Familiarity: Understand the different alarm indications (visual, auditory, vibration) to react promptly to hazardous conditions.
- Data Management: Regularly review and manage recorded data to track environmental changes and maintain device memory.
9. Warranty and Support
For warranty information, technical support, or service inquiries, please refer to the contact information provided by your retailer or the manufacturer's official website. Keep your purchase receipt as proof of purchase.
