EVURU NF-H9 Non-Contact Breath Alcohol Tester User Manual

1. Introduction

The EVURU NF-H9 is a portable, non-contact breath alcohol tester designed for personal use. It features a digital display and is rechargeable, providing a convenient way to estimate breath alcohol content. This manual provides instructions for proper use, maintenance, and understanding of the device's functions.

2. Device Overview

Familiarize yourself with the components of your EVURU NF-H9 alcohol tester.

Figure 1: The EVURU NF-H9 Breath Alcohol Tester, a compact, black device with a digital display, held comfortably in one hand.

Figure 2: The high-contrast digital display of the EVURU NF-H9, showing clear numerical readings and indicators for easy interpretation of results.

Figure 3: The EVURU NF-H9 features a sliding cover. Pushing it up reveals the sensor for testing and powers down the device for cleaning. Pushing it down covers the sensor, promoting hygienic, non-contact use.

3. Charging the Device

The EVURU NF-H9 is equipped with a rechargeable battery. Ensure the device is fully charged before first use and whenever the battery indicator shows low power.

1. Locate the USB charging port on the device.
2. Connect the provided USB cable to the device and a compatible USB power source (e.g., computer, wall adapter).
3. The charging indicator light will illuminate during charging and typically change color or turn off when fully charged.

Figure 4: The EVURU NF-H9 features a convenient USB charging port, allowing for quick and easy recharging with a standard USB cable.

4. Operating Instructions

4.1. Power On and Warm-up

1. Ensure the air port is clear.
2. Turn on the device. The backlight and display screen will illuminate, showing all content, accompanied by a "Drop" sound from the buzzer. The blue indicator light will remain on.
3. The LCD will display "warm up" and a 10-second countdown. After the countdown, the buzzer will sound, indicating readiness for testing.

Note: If the tester has not been used for an extended period, the sensor surface may oxidize. It is recommended to preheat the device several times before the first use or after long periods of inactivity to ensure accurate results.

4.2. Performing a Test

1. After the warm-up, the display will show "blow" and a 10-second countdown. The buzzer will sound after the countdown, prompting the result display.
2. During the 10-second countdown, exhale steadily into the device's air intake for approximately 5 seconds. The device will detect alcohol-containing gas and update the countdown to a 4-second blowing countdown.
3. Maintain a continuous breath flow (approximately 10L/min) for the duration of the blowing countdown.

Figure 5: Demonstrating the non-contact method of exhaling into the EVURU NF-H9 for gas detection, ensuring hygiene and ease of use.

Figure 6: The EVURU NF-H9 allows for quick and hygienic breath testing without the need for a blowpipe.

4.3. Understanding Test Results

Test results are displayed in %BAC and g/L units on the digital screen. The device also uses a tricolor indicator lamp to provide a quick visual interpretation of the results.

• Green Light: When the detection result is less than 0.02% BAC (or 0.2 g/L), the green light remains on, and no buzzer sound is emitted. This indicates a non-drinking state.
• Yellow Light: When the detection result is between 0.02% BAC (or 0.2 g/L) and less than 0.08% BAC (or 0.8 g/L), the yellow light remains on, and the buzzer emits a slow, continuous sound. This indicates a drinking state, caution is advised.
• Red Light: When the detection result is greater than or equal to 0.08% BAC (or 0.8 g/L), the red light remains on, the display screen flashes "danger", and the buzzer emits a rapid, continuous sound. This indicates a drunken state, and driving is strictly prohibited.

Figure 7: The tricolor indicator lamp on the EVURU NF-H9 visually communicates the alcohol detection state: Green for non-drinking, Orange for drinking (caution), and Red for drunken state (danger).

5. Maintenance

• Cleaning: Regularly wipe the exterior of the device with a soft, dry cloth. Do not use abrasive cleaners or immerse the device in water. Ensure the sensor area is free from dust and debris.
• Storage: Store the device in a cool, dry place, away from direct sunlight and extreme temperatures.
• Battery Care: To prolong battery life, avoid fully discharging the device frequently. Charge it regularly, even if not in constant use.

6. Troubleshooting

• Device not powering on: Ensure the device is fully charged. If the issue persists, try charging with a different USB cable or power source.
• Inaccurate readings: Ensure the device has completed its warm-up cycle. Avoid testing immediately after consuming alcohol, smoking, or using mouthwash, as this can affect accuracy. Allow at least 20 minutes after consumption before testing. Ensure a continuous and sufficient breath sample is provided.
• "Warm up" message persists: If the device repeatedly shows "warm up" or takes an unusually long time, it might indicate the sensor needs to be preheated multiple times, especially after long periods of non-use.
• No display or partial display: Check battery level. If fully charged and issue persists, contact customer support.

7. Specifications