Portable Heat Stress Monitors

Measure Humidity, Temperature and Radiant Heat
On-board humidity sensor displays relative humidity and calculates heat index or humidex. Monitors calculate and display WBGT indoors and outdoors. Both feature multilingual display and feature real-time relative humidity readings measured with RH sensor. ±0.5°C (0.9°F) temperature accuracy; ±5% relative humidity accuracy. –5° to 100°C (23°–212°F) sensor assembly temperature range; –5° to 60°C (23°–140°F) electronics temperature range. Both include wet bulb reservoir, shielded dry bulb, removable sensors for remote applications, 2" globe and 150-hour 9V battery. Measure 9.2" x 7.2" x 3", weigh 2.6 lbs.

Specifications

Calibration Range Verified

Range 25°C, 45°C, 60°C

WBGT Value Calculations
WB=Wet Bulb
GT=Vernon Globe Equivalent Temp
DB=Dry Bulb
WBGT (outdoor) = 0.7 Wet Bulb + 0.2 GT + 0.1 Dry Bulb

WBGT (indoor) = 0.7 Wet Bulb + 0.3 GT

Accuracy

Accuracy +/-0.4°C of actual temperature at 25.0°C, 45°C and 60°C @ air speed = 180 fpm minimum

Sensors

Globe Temperature Patented construction provides characteristics identical to 6" Vernon Globe

Dry Bulb Ambient air temperature

Wet Bulb Wick covered sensor with reservoir, wetted with deionized or distilled water

Battery

Type Rechargeable 9V NiMH or 9V alkaline

Life 17 hours of continuous operation

Charger Plugs into monitor, can operate unit while charging, recharges in less than 14 hours

Response Time

90% Responded Level Less than 2.2 minutes

95% Responded Level Less than 4.5 minutes, for most practical purposes, the 95% response time can be considered as fully responded

Electronics Warm Up Less than 3 seconds, provided the sensors are acclimatized, readings are valid as soon as the meter reading stabilizes

Dimensions

Size 6.2" x 3.75" x 1.75"

Weight 12 ounces