WBGT Microtherm - Casella CEL - #1

A person's thermal comfort is mainly related to the thermal balance of their body as a whole. Problems of heat stress are common in workplaces such as foundries, steel mills, brick glass and ceramic factories, power generation plants, coke ovens, laundries, modern glass buildings, mines and many other types of outdoor work in hot climates.

Whenever heat stress is imposed on the human body, the resulting strain may result in physiological reactions such as sweat production, increased heart rate and higher core temperature

Several indices have been designed to integrate the environmental factors contributing to heat stress and one such is the Wet Bulb Globe Temperature Index.

□ LCD graphics display

□ Real-time display

□ Full data logging facilities as standard

□ Low water level warning

□ Built-in alarm for WBGT levels

□ RH% and dewpoint calculation

□ Automatic calculation of work/ rest regimes via PC Software

□ Optional tripod mounting and extension cable

□ Meets the requirements of ISO 7234/ DIN

□ Ergonomic design

The Microtherm Heat Stress Wet Bulb Globe Temperature (WBGT) was specifically designed to monitor the environmental temperature conditions that are most important in provoking heat stress. It is a compact, site monitoring instrument which can be either handheld or tripod mounted; it has the following main features.

delta V detection with additional time­out protection.

Charger must be disabled for dry cell operation.

Fast charge rate 450 mA, Standby charge rate 55 mA approx.

Universal with input voltage range 100-240 VAC, 47-63 Hz. Output 12 V DC at 0.8 A. Supplied with connectors suitable for UK, USA and European mains outlet sockets. The instrument may be pow­ered continuously from the external power adapter

Sensing technique:

Platinum Resistance Temperature Detectors, 100 elements 0.1% using 4-wire cable up to 30 m.

Measuring Range: 10 - 60^oC,

±1.0^oC.

Charge Rate: Power Adapter:

Ta, Dry Bulb (Air): Accuracy:

Measuring Range: 20 - 120^oC,

Tg, Globe:

Accuracy 20 - 50^oC: ±0.5^oC, Accuracy 50 - 120^oC: ±1.0^oC.

Tnw, Natural Wet: Measuring Range: 5

40oC,

Accuracy: ±0.5^oC.

Resolution: 0.1% for temperature and RH.

Power Consumption: Approx. 30 mA.

Display:

Keypad: Weight: Dimensions:

128 x 64 pixel LCD Graphics panel with backlight.

7 key tactile membrane

Instrument with probe array: 0.97 kg,

Instrument: 245 x 95 x 50 mm. Probe Array: 90 high x 225 x 69 mm. Carrying case: 135 x 490 x 370 mm.

Battery:

4x AA /MN1500 cells Alkaline or rechargeable Nickel Cad­mium.

Alkaline Batteries (2700 mAh), typically >20 hours, Rechargeable NiCd cells (950 mAh), typically >9 hours

Internal NiCd fast charger circuitry. Charge termination based on Negative

Operating run time:

Wet Bulb Globe Temperature Indoor,

Wet Bulb Globe Temperature Outdoor,

Wet Bulb Globe Temperature Indoor Time Weighted

Aveage,

Battery Charging: