1. Introduction
The AOPUTTRIVER AP-881W is a multi-functional device designed to accurately measure environmental conditions critical for assessing heat stress and wind conditions. This 3-in-1 meter integrates capabilities for measuring Wet Bulb Globe Temperature (WBGT), wind speed, humidity, and air temperature. It is an essential tool for professionals and enthusiasts in various fields, including HVAC, outdoor sports, industrial safety, and environmental monitoring.
This manual provides detailed instructions on the operation, maintenance, and troubleshooting of your AP-881W meter to ensure optimal performance and longevity.
Figure 1.1: AOPUTTRIVER AP-881W Heat Stress Meter Anemometer, showing the main unit, carrying case, screwdriver, and batteries.
2. Safety Information
- Read all instructions carefully before operating the device.
- Do not expose the device to extreme temperatures, direct sunlight for prolonged periods, or corrosive environments.
- Avoid dropping or subjecting the device to strong impacts.
- Keep the device away from water and high humidity unless specified for such conditions.
- Do not attempt to disassemble or modify the device. Repairs should only be performed by qualified personnel.
- Dispose of batteries according to local regulations.
3. What's in the Box
Verify that all items are present upon unboxing:
- AP-881W Heat Stress Meter Anemometer
- Instruction Manual
- Screwdriver
- Batteries (typically 2 x AAA)
- Carrying Case
Figure 3.1: Package contents of the AP-881W meter.
4. Product Overview
The AP-881W features a robust design with an integrated black ball sensor for WBGT measurements, a sensitive vane for wind speed, and a clear LCD display for easy readings.
Figure 4.1: Front view of the AP-881W with labeled components.
4.1. Components and Display
- WBGT Index: Displays the Wet Bulb Globe Temperature reading.
- Indoor/Outdoor Indicator: Shows if the device is set for indoor or outdoor WBGT calculation.
- Beep Prompt: Indicates audible alerts.
- Power Prompt: Battery status or power indicator.
- Ambient Temperature: Current air temperature.
- WBGT Zone Indicator: Visual alert for heat stress levels (Caution, Extreme Caution, Danger, Extreme Danger).
- Wind Speed Unit: Displays the selected unit for wind speed (m/s, km/h, ft/min, knots, mph).
- MAX/MIN Switch: Indicates if maximum or minimum readings are displayed.
- Ambient Humidity: Current relative humidity.
4.2. Buttons and Functions
- MAX/MIN Button: Toggles between maximum, minimum, and current readings.
- WIND / MODE Button: Selects wind speed units or switches between measurement modes.
- ℃/℉ Button: Toggles temperature units between Celsius and Fahrenheit.
- Power Button: Turns the device ON/OFF.
- SET Button: Used for setting WBGT alarm thresholds.
- OUT/IN Button: Selects indoor or outdoor mode for WBGT calculation.
- Up/Down Arrows: Adjust values during settings or navigate menus.
Figure 4.2: Key features of the AP-881W, including the ABS black ball, sensitive vanes, and LCD screen.
5. Getting Started
5.1. Battery Installation
The AP-881W requires 2 AAA batteries (included). Follow these steps to install them:
- Locate the battery compartment cover on the back of the device.
- Use the provided screwdriver to loosen the screw securing the battery cover.
- Remove the cover.
- Insert the 2 AAA batteries, ensuring correct polarity (+ and -).
- Replace the battery cover and tighten the screw.
5.2. Powering On/Off
- To turn on the device, press and hold the Power button for approximately 2 seconds.
- To turn off the device, press and hold the Power button again for approximately 2 seconds.
- The device features an auto-power-off function to conserve battery life.
6. Operation
6.1. Measurement Modes
The AP-881W simultaneously displays WBGT, ambient temperature, and humidity. Wind speed is displayed in a separate section of the LCD.
- WBGT (Wet Bulb Globe Temperature): This index combines temperature, humidity, wind speed, and radiant heat to assess heat stress. The black ball sensor measures radiant heat.
- Wind Speed: Measured by the sensitive vanes at the top of the device.
- Ambient Temperature: Air temperature measurement.
- Humidity: Relative humidity measurement.
6.2. Unit Switching
- Temperature Units (℃/℉): Press the ℃/℉ button to toggle between Celsius and Fahrenheit.
- Wind Speed Units: Press the WIND / MODE button to cycle through wind speed units: m/s, km/h, ft/min, knots, mph.
6.3. WBGT Alarm Setting
The WBGT alarm function alerts you when the heat stress level reaches a predefined threshold. The device uses a color-coded zone indicator on the display.
Figure 6.1: WBGT Zone Indicator and corresponding temperature ranges.
To set the WBGT alarm:
- Press the SET button to enter alarm setting mode.
- Use the Up/Down Arrows to adjust the desired WBGT alarm threshold.
- Press SET again to confirm and exit.
The display will show different colors (Caution, Extreme Caution, Danger, Extreme Danger) to visually indicate the current heat stress level relative to the set alarm or standard thresholds.
6.4. MAX/MIN Readings
Press the MAX/MIN button to view the maximum or minimum recorded values for wind speed, temperature, and humidity since the device was powered on or reset.
- Press once for MAX value.
- Press again for MIN value.
- Press a third time to return to current readings.
6.5. Indoor/Outdoor WBGT Mode
Press the OUT/IN button to switch between indoor and outdoor WBGT calculation modes. This adjusts the algorithm for more accurate readings based on the environment.
6.6. Backlight
The LCD display features a backlight for improved visibility in low-light conditions. The backlight typically activates automatically when a button is pressed and may turn off after a short period of inactivity to save battery.
