Question 1

Thermal Work Limit

Accepted Answer

What is TWL?

Thermal Work Limit(TWL) is a heat index calculated from environmental parameters, including dry-bulb temperature, wet-bulb temperature, globe bulb temperature, and wind speed and accommodates for clotting factors as well as the human physiological status to estimate a safe maximum continuous suitable metabolic rate. It is designed primarily for self-paced workers who are well hydrated and acclimatized in the working condition.

Why TWL is better than WBGT and Heat Index?

The TWL predicts the maximum level of work that can be carried out in a given environment, without workers exceeding a safe core body temperature 38.2 °C (100.8 °F) and sweat rate (< 1.2 kg or 2.6 lb per hour).WBGT does not incorporate a direct measure of wind speed and requires estimation of metabolic rates, which can have a margin of error up to 50%. Heat stress indexes such as WBGT and ISO 7933 do not take into account the effects of long hours of hard work, dehydration, or the impact of personal protective clothing and equipment.WBGT and heat index are too conservative and inappropriate for practical in the extreme working environments such as Middle East countries or high-temperature process industry or mines. Scarlet TWL-1S incorporated both WBGT and TWL index features. You can simply switch heat indices for your need.

Where is it needed or appropriate to install it?

Worksite
Laboratory
Factory
Construction site
Transportation site
Open-cut mining

Question 2

Why we need Sound Level Meter?

Accepted Answer

Why we need Sound Level Meter?

A sound level meter is a device used to measure the intensity of sound waves. Use of this device is extremely important because it ensures that all sound exposures are below the threshold of what is considered safe for human ears. For this reason, it is vital to ensure that all sound level meters used on jobs sites have been properly calibrated to assure sound wave measurements are accurate.

What is different between Class 1 and Class 2?

At the reference frequency of 1kHz, the tolerance limits for Class 1 are +/- 1.1dB and for Class 2 the tolerance is +/- 1.4dB.
At the lower and upper extremities of the frequency range, the tolerances are wider. At 20Hz, the tolerances are +/-2.5dB for Class 1 and +/- 3.5dB for Class 2.
At 16Hz, the tolerances are +2.5dB, -4.5 dB for Class 1 and +5.5 dB and -∞ dB for Class 2.
At higher frequencies, the same applies. The tolerances for a Class 1 instrument are tighter at frequencies above 8kHz with the tolerances at 10kHz being +2.6dB, -3.6dB for Class 1 and +5,6dB, -∞ for Class 2.
At a higher frequency of 16kHz, the tolerances are +3.5dB, -17dB for Class 1 and +6.0dB, -∞ dB for Class 2.

A Class 1 instrument must have a better response and must meet the tighter tolerances.

Where does Scarlet Class 1 Sound Level Meter Apply?

Construction site
Orchestras
Road Construction
Airport
Police Force
Anywhere care abou

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