Kethvoz HVAC Airflow Meter Model 866A Instruction Manual

1. Introduction

The Kethvoz Model 866A Handheld Anemometer is a professional instrument designed for accurate measurement of wind speed, airflow (CFM/CMM/CMS), air temperature, humidity, dew point temperature, and wet bulb temperature. It is suitable for various applications including HVAC installations, air conditioning system maintenance, vent and dust collector monitoring, outdoor activities, and drone flight testing. This manual provides detailed instructions for the proper use and maintenance of your device.

2. Safety Information

• Read all instructions carefully before operating the device.
• Do not expose the device to extreme temperatures, humidity, or direct sunlight for extended periods.
• Avoid strong impacts or dropping the device.
• Keep the impeller free from obstructions and debris to ensure accurate readings.
• Remove batteries if the device will not be used for a long time to prevent leakage.
• Do not attempt to disassemble or modify the device, as this will void the warranty.

3. Package Contents

Please check the package contents upon receipt to ensure all items are present and undamaged:

• Kethvoz 866A Handheld Anemometer
• USB Cable
• User Manual
• Carrying Pouch
• AAA Batteries (2x)

Image: The Kethvoz 866A Anemometer and its included accessories, such as the USB cable, user manual, carrying pouch, and two AAA batteries.

4. Product Overview

The Kethvoz 866A features a large backlit LCD display for easy reading, an integrated impeller for wind speed and airflow measurements, and dual temperature sensors for accurate environmental readings. It also includes a 1/4'' standard metal screw hole for tripod mounting.

Image: A detailed diagram highlighting key features of the Kethvoz 866A, including the upgraded wind sensor, dual temperature sensors, data hold capability, relative humidity display, backlit LCD, and the tripod mountable 1/4 inch screw hole.

4.1. Device Layout

• Impeller: Measures wind speed and airflow.
• LCD Display: Shows measurement readings, units, and indicators.
• Power Button (Red Circle): Turns the device ON/OFF.
• HOLD/MODE Button: Freezes current readings (HOLD) or switches between measurement modes (e.g., Real-Time, MAX, MIN).
• FUNC Button: Used to enter cross-sectional area for airflow calculation and other function settings.
• USB Button: Activates USB data logging mode.
• UNIT Button: Cycles through different measurement units.
• Up/Down Buttons (Triangle): Used for adjusting settings or navigating menus.
• 1/4'' Screw Hole: For mounting on a tripod.

5. Setup

5.1. Battery Installation

1. Locate the battery compartment cover on the back of the device.
2. Slide the cover open.
3. Insert two AAA batteries, ensuring correct polarity (+/-).
4. Close the battery compartment cover securely.

5.2. Powering On/Off

• To power on, press the red Power button. The LCD display will light up.
• To power off, press and hold the red Power button for approximately 2 seconds.
• The device features an auto power-off function to save battery life. It will automatically shut down after a period of inactivity.

6. Operating Instructions

6.1. Wind Speed Measurement

The device measures wind speed in real-time. Ensure the impeller is exposed to the airflow you wish to measure.

• Power on the device.
• The current wind speed will be displayed on the main screen.
• Press the UNIT button to cycle through wind speed units: m/s, Ft/s, Ft/min, Knots, Km/hr, Mph.

Image: The Kethvoz 866A Anemometer's display showing current wind speed (e.g., 13.6 km/h), air temperature, and humidity. The top icons indicate various functions like humidity, wind speed units, PC connect, temperature unit switch, and data freeze.

6.2. Airflow (CFM/CMM/CMS) Measurement

To measure airflow, you must first input the cross-sectional area of the duct or vent.

1. Power on the device.
2. Press the FUNC button to enter the area input mode.
3. Use the Up/Down buttons to adjust the cross-sectional area value.
4. Press FUNC again to confirm the area and switch to airflow measurement mode.
5. The airflow value will be displayed in CFM, CMM, or CMS. Press the UNIT button to cycle through these units.

Image: The Kethvoz 866A Anemometer showing the process of inputting a cross-sectional area (e.g., 119.0 m²) and then displaying the resulting wind flow in CFM (e.g., 389.0 CFM). The image also lists the available wind flow units: CFM, CMM, CMS.

6.3. Temperature and Humidity Measurement

The 866A continuously monitors air temperature and relative humidity.

• Temperature and humidity readings are typically displayed alongside wind speed on the main screen.
• To switch between Celsius (°C) and Fahrenheit (°F) for temperature, press and hold the UNIT button.
• The device also calculates dew point temperature and wet bulb temperature, which can be accessed through the FUNC button in certain modes.

6.4. Data Hold (Freeze)

To freeze the current reading on the display:

• Press the HOLD/MODE button once. The "HOLD" indicator will appear on the screen.
• Press the HOLD/MODE button again to release the data hold and resume real-time measurements.

6.5. MAX/MIN Measurement

To view the maximum or minimum recorded values:

• Press the MAX/MIN button. The display will show the maximum recorded value (MAX).
• Press the MAX/MIN button again to cycle to the minimum recorded value (MIN).
• Press the MAX/MIN button a third time to return to real-time measurement.

6.6. PC Connection and Data Export

The Kethvoz 866A supports real-time data upload and export to a computer.

1. Connect the device to your computer using the provided USB cable.
2. Press the USB button on the anemometer to activate data logging mode.
3. Install the necessary software on your computer (refer to the included software CD or manufacturer's website for download).
4. Use the software to monitor data in real-time, store up to 600 groups of measurements, and export data for analysis.

Image: The Kethvoz 866A Anemometer connected to a laptop via its USB cable, illustrating the process of PC connection, data storage, and data export using dedicated software.

7. Maintenance

7.1. Cleaning

• Wipe the device with a soft, dry cloth.
• Do not use abrasive cleaners or solvents.
• Ensure the impeller is free of dust and debris. Use a soft brush or compressed air if necessary, being careful not to damage the blades.

7.2. Storage

• Store the device in its carrying pouch when not in use.
• Keep it in a cool, dry place, away from direct sunlight and extreme temperatures.
• Remove batteries if storing for an extended period to prevent leakage and damage.

8. Troubleshooting

9. Specifications

• Brand: Kethvoz
• Model: 866A
• Material: Polycarbonate (PC)
• Item Dimensions (L x W x H): 4.33 x 7.48 x 1.97 inches (110 x 190 x 50 mm)
• Item Weight: 250 Grams
• Wind Speed Range: 0.8 ~ 40 m/s
• Wind Speed Accuracy: ±2%
• Wind Speed Units: m/s, Ft/s, Ft/min, Knots, Km/hr, Mph
• Airflow Range: 0 ~ 99,990 CFM (CMM, CMS)
• Air Temperature Range: -10°C ~ 60°C (14°F ~ 140°F)
• Humidity Range: 0 ~ 100% RH
• Display: Backlit LCD
• Data Logging: Up to 600 groups, PC export via USB
• Power Source: 2x AAA Batteries
• Additional Features: Data Hold, MAX/MIN measurement, Auto Power Off, Low Battery Indication, 1/4'' Tripod Mountable Screw Hole

Image: The Kethvoz 866A Anemometer shown in hand, illustrating its compact size and dimensions (6.49 inches / 165mm length, 3.34 inches / 85mm width).

10. Warranty Information

Kethvoz products are covered by a limited warranty against defects in materials and workmanship for a period of 12 months from the original purchase date. This warranty does not cover damage caused by misuse, accident, unauthorized modification, or normal wear and tear. Please retain your proof of purchase for warranty claims.

11. Customer Support

If you have any questions, require technical assistance, or need to make a warranty claim, please contact Kethvoz customer support through the following channels:

• Email: Refer to the contact information provided in your product packaging or on the official Kethvoz website.
• Website: Visit the Kethvoz official website for FAQs and support resources.

Please provide your product model (866A) and purchase details when contacting support.