Casella CEL Microtherm WBGT heat stress monitor - Manual (Page 41)

5. SPECIFICATION
5.1 Instrument Specification
Measurement
Sensing technique: Platinum Resistance Temperature
Detectors, 100 Ω elements to EN 60751
Class A using 4-wire cable up to 30 m,
Ta, Dry Bulb (Air): Measuring Range: 10 - 60 o C,
Accuracy: ±0.5 o C,
Tg, Globe: Measuring Range: 20 - 120 o C,
Accuracy 20 - 50 o C: ±0.5 o C,
Accuracy 50 - 120 o C: ±1.0 o C,
Tnw, Natural Wet: Measuring Range: 5 - 40 o C,
Accuracy: ±0.5 o C,
Relative Humidity: Less than ±5% from 35 - 100% RH,
Resolution: 0.1 o for temperature,
0.1% for RH.
For inside/outside measurements with no solar load:
Use WBGTin = 0.7Tnw + 0.3Ta.
For outside measurements with solar load:
Use WBGTout = 0.7Tnw + 0.2Tg + 0.1Ta.
Power Supply
Instrument Consumption: Approx. 30 mA.
Battery: 4 x AA / MN1500 cells Alkaline or
rechargeable Nickel Cadmium.
Typical operating time: Alkaline Batteries (2700 mAh), >85 hours,
Rechargeable NiCd cells (950 mAh),
>30 hours
Battery Charging Internal NiCd fast charger circuitry.
Charge termination based on Negative
delta V detection with additional time-out
protection.
The charger must be disabled for dry cell
operation.
Charge Rate Fast charge rate 450 mA,
Standby charge rate 55 mA approx.
Power adapter Universal with input voltage range
100 - 240 V AC, 47 - 63 Hz.
Output 12 V DC at 0.8 A.
Supplied with connectors for UK, USA
and European mains outlet sockets. The
instrument may be powered continuously
from the external power adapter.
Page 41 of 44
Specification MICROTHERM Heat Stress WBGT &
WinHSM Application Software - User Manual