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.
| WBGT | Warning level | Guide |
Above 31°C | Danger | All exercise should be stopped except for special cases. Children must stop it especially. |
| 28 to 31°C | Severe warning | The 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°C | Warning | 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°C | Caution | Fatal 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°C | Almost safe | The 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
| WBGT | Type of risks in relation to physical activity | Remarks |
| Danger (31°C or higher) | Risk during any physical activity | Risk 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 activity | Avoid direct sunlight outdoors and watch for any rise in room temperature indoors. |
| Warning (25 to 28°C) | Risk during moderate to vigorous physical activity | Take adequate rest regularly when exercising or doing vigorous work. |
| Caution (25°C or lower) | Risk during very vigorous physical activity | Low 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
| Level | Examples | WBGT threshold | |
| For those acclimated to heat | For those not acclimated to heat | ||
| 0 Resting | Resting, sitting at ease | 33°C | 32°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°C | 29°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; forging | 28°C | 26°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 blocks | 26°C | 23°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/h | 25°C | 20°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 exercise | Heat stress prevention guidelines for daily life | Buzzer sound |
| Almost safe/Caution | Caution | Beep, beep, beep |
| Warning | Warning | Beep-beep, beep-beep |
| Severe warning | Severe warning | Beep-beep-beep, beep-beep-beep |
| Danger | Danger | Beeeep, 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 name | Heat Stress Monitor | |
| Model name | SK-181GT | |
| Measuring range | Temperature | 0.0 to 50.0°C Globe temperature 0.0 to 60.0°C is also measured but not displayed. |
| Humidity | 10.0 to 95.0%rh | |
| WBGT | 0.0 to 50.0°C | |
| Accuracy | Temperature | ±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) | |
| Resolution | 0.1°C / 0.1%rh | |
| Sampling time | 20 seconds | |
| Alarm volume | 75 dB | |
| Operation ambient | 0 to 50°C, less than 95%rh without condensing, wind speed 0.3 to 3.0 m/s | |
| Power | Lithium coin cell CR2032 x2 in parallel | |
| Battery life | Approx. 6 months in continuous use if the alarm works twice a day | |
| Materials | ABS resin (case, black globe) | |
| Dimensions | Main body | 60 (W) x 122 (H) x 25 (D) mm |
| Globe | 40 mm diameter | |
| Weight | 70 g including batteries | |
| Standard accessories | Neck strap x1, carabiner x1, belt attachment parts x1, key ring x1, lithium coin cell CR2032 x2, instruction manual | |
| Optional item | No. 8310-90 Tripod ZF-400WSH | |
* Attached batteries are for test use and may last shorter than the indicated life.
