This instruction manual is for the 8778 Heat Stress Meter, and it covers the device's operation, maintenance and calibration.
The Reed Instruments Model 8778 Heat Stress Meter is a handheld device designed to measure Wet Bulb Globe Temperature (WBGT), Black Globe Temperature, Air Temperature, and Relative Humidity. It features an adjustable audible alarm, auto power-off function, and RS232/USB interfaces for data logging. The meter supports both Celsius and Fahrenheit units and includes an IN/OUT switch to account for direct sun exposure.
| Air Temp. Range | 0.0 to 50.0°C (32 to 122°F) |
|---|---|
| Air Temp. Accuracy | ±0.6°C (±1.1°F) |
| Black Globe Temp. Range | 0.0 to 80.0°C (32 to 176°F) |
| Humidity Range | 0 to 100% RH |
| Humidity Accuracy | ±3% RH: 10 to 90% RH, ±5% RH: rest of range |
| Power Supply | 2 x AAA batteries |
| Power Consumption | 1000 hours (Alkaline), 250 hours (General purpose) |
| Dimensions | 10 x 1.9 x 1.1” (254 x 49 x 30mm) |
The alarm threshold is adjustable between 20.0°C and 37.2°C (68°F to 99.0°F).
When the meter is off, hold down the and buttons for 2 seconds to enter Non-Sleep mode.
The calibration process takes approximately 60 minutes to complete.
The E2 error message indicates that the value is under range or there is an improper sensor installation.