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No.8313-50

Heat Stress Monitor

SK-181GT

JAN code : 4974425831227

Calibration : Available

JCSS Accredited Calibration : Available

SK-181GT is a compact all-in-one heat stress monitor that can measure temperature, humidity and heat radiation to calculate WBGT index, which is used as a guide for preventing heat stroke and estimating heat stress in a hot environment. Conforms to JIS B 7922:2023 Class 2, based on ISO 7243.

    • Instruction manual

Product Overview (Japanese only)


Introduction to All Heat Stress Monitors from SK Sato (Japanese only)



Feature

Conforms to JIS B 7922:2023 Class 2

SK-180GT complies with the Class 2 (accuracy of WBGT index: ±2°C) of JIS B 7922:2023 "Electronic wet bulb globe temperature (WBGT) index meter."

Black globe equipped to measure heat radiation

A globe on the top detects heat radiation generated by direct and reflected sunlight, for accurate environmental evaluation with temperature, humidity, and globe temperature together assigned to calculation.

Supports two types of heat stress bar graph displays

SK-180GT displays either one of the bar graphs of the following heat stress levels of your choice.

- "Heat stress prevention guidelines for exercise"

- "Heat stress prevention guidelines for daily life"

Supports switching between two measurement environments, outdoors and indoors

The formula for calculating WBGT index differs when measured outdoors and indoors. Choosing either one according to the environment enables accurate measurement.

Alarm function

A buzzer sounds and an LED light blinks when the WBGT reaches a set value.

A variety of accessories for easy carrying and installation

SK-180GT is a compact portable kit with a carabiner, belt attachment parts, and a neck strap included in the kit. Also, a screw hole in the back enables the unit to be installed on an optional tripod.

Key lock function

Prevents unexpected suspension of measurement.

Description

Conforms to JIS B 7922:2023 Class 2

The Ministry of Health, Labour and Welfare of the Government of Japan promotes Combat Heat Stroke Campaign every year to eliminate casualties from heat illness.

The article 10 "Activities in detail at each workplace" in the implementation guideline of the campaign stipulates as follows:

"Prepare a WBGT measuring device conformed to JIS Z 8504 or JIS B 7922. If the WBGT indices differ greatly at each worksite due to heat radiation or such, prepare a device which is easily portable."

SK-180GT is easily portable, conformed to JIS B 7922:2023 Class 2, and equipped with a black globe measurable heat radiation, to fully satisfies this requirement.

Bar graph display of WBGT index

Measured WBGT index is shown on a bar graph so that you can easily check the danger.

Either one of the following warning levels can be selected to be displayed.

- "Heat stress prevention guidelines for exercise"

- "Heat stress prevention guidelines for daily life"


Heat stress prevention guidelines for exercise: Abstracted from "A Guidebook for the Prevention of Heat Disorder During Sports Activities," Japan Sport Association, 2013.

WBGTWarning levelGuide

Above 31°C

DangerAll exercise should be stopped except for special cases. Children must stop it especially.
28 to 31°CSevere warningThe risk of heat stress is high, so avoid exercises that can increase body temperature, such as long runs or something intense. Those who are not strong physically or not acclimated to heat must stop exercise. Take a break and replenish water with salt as often as possible.
25 to 28°CWarning

The risk of heat stress increases, so take a break and replenish water with salt as appropriate. Have a rest every 30 minutes when you do intense exercise.

21 to 25°CCautionFatal accidents may occur due to heat stress. Pay attention to signs of heat stress, and replenish plenty of water with salt between exercises.
Below 21°CAlmost safeThe risk of heat stress is usually low, but supplementation with water and salt is necessary. Heat stress could occur even under this WBGT in events such as marathons, so caution is advised.


Heat stress prevention guidelines for daily life: Abstracted from "Heat Stress Prevention Guidelines for Daily Life," Japanese Society of Biometeorology, 2013

WBGTType of risks in relation to physical activityRemarks
Danger
(31°C or higher)
Risk during any physical activityRisk of occurrence is high for the elderly, even when they rest. Avoid going out and stay in a cool room.
Severe warning
(28 to 31°C)
Risk during any physical activityAvoid direct sunlight outdoors and watch for any rise in room temperature indoors.
Warning
(25 to 28°C)
Risk during moderate to vigorous physical activityTake adequate rest regularly when exercising or doing vigorous work.
Caution
(25°C or lower)
Risk during very vigorous physical activityLow in risk basically, but high in risk when doing vigorous exercise or heavy labor.

You can also check the warning level by reading WBGT value itself.

Table of threshold values of WBGT index: Abstracted from the WBGT threshold and the classification of levels of metabolic rate, both included in ISO 7243:2017Ergonomics of the thermal environment - Assessment of heat stress using the WBGT index

LevelExamplesWBGT threshold
For those acclimated to heatFor those not acclimated to heat
0
Resting
Resting, sitting at ease33°C32°C
1
Low metabolic rate
Light manual work (writing, typing, drawing, sewing, book-keeping); hand and arm work (small bench tools, inspection, assembly or sorting of light materials); arm and leg work (driving vehicles in normal conditions, operating foot switch or pedal).
Standing: drill (small parts); milling machine (small parts); coil winding; small armature winding; machining with low power tools; casual walking (speed up to 3.5 km/h)
30°C29°C
2
Moderate metabolic rate
Sustained hand and arm work (hammering in nails, filling); arm and leg work (off-road operation of trucks, tractors or construction vehicles); arm and trunk work (work with pneumatic hammer, assembly of tractors, plastering, intermittent handling of moderately heavy material, weeding, hoeing, picking fruit or vegetables); pushing or pulling light-weight carts or wheelbarrows; walking at a speed of 3.5 to 5.5 km/h; forging28°C26°C
3
High metabolic rate
Intense arm and trunk work (carrying heavy material, shoveling, sledge hammer work, sawing, planing or chiseling hard wood, hand mowing, digging); walking at a speed of 5.5 to 7 km/h; pushing or pulling heavily loaded carts or wheelbarrows; chipping castings; laying concrete blocks26°C23°C
4
Very high metabolic rate
Very intense activity at fast to maximum pace (work with an axe, intense shoveling or digging); climbing stairs; running; walking at a speed greater than 7 km/h25°C20°C

* "Those not acclimated to heat" indicates people who have not been exposed to heat every day during the week preceding the day they exercise on.

Alarm function

A buzzer sounds and an LED light blinks when the WBGT reaches a set level of your choice.

- If the measured WBGT reaches the set level, an alarm is activated for 10 seconds. You can turn on and off the buzzer while the blinking of the LED cannot be turned off.

- If the WBGT continues to exceed the set level, the alarm works for 2 seconds every 10 minutes.

- If the WBGT increases or decreases as much as the warning level changes during the WBGT is higher than the set level, the alarm works for 10 seconds to notify such change.

- The sound of a buzzer differs depending on the warning level.


Heat stress prevention guidelines for exerciseHeat stress prevention guidelines for daily lifeBuzzer sound
Almost safe/CautionCautionBeep, beep, beep
WarningWarningBeep-beep, beep-beep
Severe warningSevere warningBeep-beep-beep, beep-beep-beep
DangerDangerBeeeep, beeeep

Other functions

Being compact and portable

Key lock function to prevent incorrect operation

A carabiner, belt attachment parts, and a neck strap equipped

A screw hole in the back enables the unit to be installed on an optional tripod.

Specifications

Cat. No.8313-50
Product nameHeat Stress Monitor
Model nameSK-181GT
Measuring rangeTemperature0.0 to 50.0°C
Globe temperature 0.0 to 60.0°C is also measured but not displayed.
Humidity10.0 to 95.0%rh
WBGT0.0 to 50.0°C
AccuracyTemperature±0.6°C (20.0 to 40.0°C)
±1.0°C (other)
Humidity±5%rh (20 to 30°C, 30 to 90%rh)
±7%rh (other)
WBGT±2.0°C (20.0 to 40.0°C)
±3.0°C (other)
Resolution0.1°C / 0.1%rh
Sampling time20 seconds
Alarm volume75 dB
Operation ambient0 to 50°C, less than 95%rh without condensing, wind speed 0.3 to 3.0 m/s
PowerLithium coin cell CR2032 x2 in parallel
Battery lifeApprox. 6 months in continuous use if the alarm works twice a day
MaterialsABS resin (case, black globe)
DimensionsMain body60 (W) x 122 (H) x 25 (D) mm
Globe40 mm diameter
Weight70 g including batteries
Standard accessoriesNeck strap x1, carabiner x1, belt attachment parts x1, key ring x1, lithium coin cell CR2032 x2, instruction manual
Optional itemNo. 8310-90 Tripod ZF-400WSH

* Attached batteries are for test use and may last shorter than the indicated life.