SATO SK-170GT User manual

INSTRUCTION MANUAL

No. 8312-00 Heat Stress Monitor

Model SK-170GT (JIS Conformed)

Introduction

Thank you for purchasing the Heat Stress Monitor Model SK-170GT.

This product measures WBGT index*, air temperature, globe temperature, and humidity. Do

not use it for other purposes.

* The WBGT (Wet Bulb Globe Temperature) index is a general heat stress index used in ISO

7243 Hot environments - Estimation of the heat stress on working man, based on the WBGT

index and its application in Japan, JIS Z8504.

The WBGT index is often used in health and safety guidelines for workplaces and sporting

situations.

Please read this manual thoroughly before using the instrument and keep the manual in a

safe place for your future reference.

PRECAUTION

Make sure you fully understand the following facts about this instrument before use for proper

usage.

This instrument does not prevent heat stress.

This instrument indicates WBGT index which can be used as guidelines for heat stress.

Heat stress is caused not only by high temperature ambient, but also by one’s health

condition, one’s adaptability to hot environment, etc.

WARNING

Never use this instrument in an atmosphere exposed to inflammable gases as it

may explode.

* If there is anything you are not clear about this instrument, contact a dealer or

us.

CAUTION

Please keep the followings for proper use of the instrument.

Use this instrument in a normal atmosphere only.

This instrument is not waterproof. Never let the instrument to get wet.

Using the instrument out of its measuring range can cause malfunctions.

Never directly touch the humidity sensor.

If the instrument gets condensed with moisture, turn the power off immediately and let it

dry naturally before using it again.

If the instrument is used in an electrically noisy environment, the instrument could show

unstable values and errors in accuracy.

Never disassemble or alter the instrument to avoid any malfunctions and damages.

This is a precision instrument. Be careful not to drop or give shocks to it.

Do not wash or wipe this unit with alcohol, thinner, or any other solvents. If the instrument

gets dirty, wipe it with a tightly wrung towel that has been dipped in warm detergent water.

Remove the battery if the instrument is not in use for a long period of time. Otherwise,

the battery power may be wasted and the battery fluid may leak, resulting malfunctions.

Do not dispose the used battery into a fire.

Keep battery out of reach of children. If swallowed, seek a medical attention immediately.

Dispose the used battery according to your local rules and regulations.

Please contact a distributor or us for repairs or calibrations.

Overview

The SK-170GT is a portable heat stress monitor which can measure globe temperature, air

temperature and relative humidity at the same time. From the measured values, this

instrument can calculate the WBGT index which is used as a preventive measure for a heat

stress and a guideline for proper working environment.

Features

JIS B7922 class 2 compliant

Compliant with JIS B7922 class 2 (electronic Wet Bulb Globe Temperature (WBGT) index

meter). It can be used as a guideline for preventing heat stress in sports activities, daily

life, and labor.

Globe equipped

The radiation heat (globe temperature) from direct sunlight can be measured.

Displays WBGT index, air temperature, globe temperature, and humidity

A variety of application is available.

Portable design

Useful for carrying.

Fixable to a camera tripod

Has a screw hole to mount on a camera tripod for a stable measurement.

Selectable from two types of WBGT measuring ambient, indoors or outdoors

The formula for calculating WBGT index differs when measured indoors and outdoors.

This instrument has a function to switch between these two.

Wind speed settable

The WBGT index and globe temperature depend on the ambient wind speed. This

instrument has a function to input the wind speed so as to correct the shown values.

Hold function

Enables easy reading.

Minimum and maximum functions

Displays minimum and maximum values for safe monitoring.

Alarm function

A buzzer sounds when the WBGT index reaches the limit set in advance.

Auto power-off function

Shuts down automatically in 20 minutes to save the battery.

Transmittable with RS232C

Optional RS232C cable is available to send data to a PC for real-time monitoring.

Names of Components

Main Unit

①

Display

Section

Measured values and state of the main unit are displayed.

* Refer to “LCD Display” for details

②

POWER

On/off key

③

HOLD

Press this key to hold a measured value shown on the LCD. Press

the key again to release it.

④

MN/MX/RST

In measurement mode, press this key to display the minimum or

maximum value. Press it for 2 seconds to reset the values.

⑤

SET

Use this key to set the alarm or wind speed.

In WBGT mode, press it for 2 seconds to enter the alarm setting

mode. In globe temperature mode, press the key for 2 seconds to set

the wind speed. After changing them press the key again for 2

seconds to fix the value and return to measurement mode.

⑥

IN_OUT/Next

Press this key for 2 seconds in WBGT mode to set WBGT measuring

ambient to either indoor (IN) or outdoor (OUT).

In alarm setting mode, press it to change the focused place value to

be edited.

In wind speed setting mode, press the key to decrease the value.

⑦

MODE/Up

In measurement mode, press this key to switch between each mode

of WBGT index (WBGT), air temperature (TA), globe temperature

(TG), or humidity (RH).

In alarm setting mode or wind speed setting mode, press the key to

increase the value.

RS232C

Cable Jack

Buzzer

Speaker

Battery

Compartment

Hole for

Tripod

⑧

Sensing

Section

Temperature and humidity sensors are inside of this section.

⑨

Cover for

Sensing

Section

This cover protects sensors from dirt and stains. Turn it to open or

close the sensing section.

Be sure to open the cover when measuring. Keep it closed when not

in use.

⑩

Globe

Inside the globe, there is a sensor to measure the radiation heat.

LCD Display

①

7-segment

Display

Displays WBGT index (WBGT), air temperature (TA), globe

temperature (TG), or humidity (RH). Also, it displays the set value

in alarm or wind speed setting mode.

②

MIN

Indication for minimum measured value

③

MAX

Indication for maximum measured value

④

WBGT

Indication for WBGT value

⑤

Indication for globe temperature value

⑥

Indication for air temperature value

⑦

Indication for humidity value

⑧

Indication for indoor values in WBGT mode

⑨

OUT

Indication for outdoor values in WBGT mode

⑩

HOLD

Indication of held data

⑪

Low Battery Mark

Indication of low battery: Replace immediately when it blinks.

⑫

Unit for humidity (%rh)

⑬

°C

Unit for air temperature, globe temperature and WBGT

Loading and Replacing Battery

①Use a positive screwdriver to loosen the screw on the battery compartment.

②Remove the old battery if replacing the battery.

③Set a new 9VDC Battery 6F22 (006P) with correct polarity (+ and −) marked inside the

battery compartment.

④Close the battery cover and secure it with the screw.

Note:A configured alarm value, wind speed, and measuring ambient setting (IN or OUT) will

not be reset even if a battery is removed.

CAUTION

Once the low battery mark starts to flash, replace with a new battery immediately.

Under the low battery mark flashing, accurate measurement cannot be expected.

Always use a new battery for replacement.

How to Measure

①Expose the sensing section by turning the cover.

②Turn on the power by pressing the POWER key.

③Select a measurement mode by pressing the MODE/Up key. The display changes in the

following order.

WBGT index (WBGT) Air temperature (TA)

Humidity (RH) Globe temperature (TG)

④Have the instrument fully adapt to measuring ambient before measurement. Set the

instrument far away from your body by holding the lower part of the unit, or use the

instrument fixed onto a camera tripod, for accurate measurement.

The radiation heat may affect the environment of the sensing section and the main unit

to result into inaccurate measurement when used for a long time outdoors with strong

radiation heat. It is recommended to attach an external cover to protect the sensing

section and the main unit except the globe from direct sunlight in such cases.

Note: Measuring conditions such as measurement height differ by purpose of use.

⑤Press the POWER key to end the measurement.

Note: Always close the sensing section for storing.

Notice: If the LCD behaviors differently from the usual such as it blinks the measured value

or switches the shown data, it is possible that the instrument is in maintenance mode.

Turn off the power and reboot in such a case.

⚫Setting of Measuring Ambient (IN or OUT)

The way to calculate WBGT index differs due to its environment. Make sure to set the proper

measuring ambient either IN or OUT according to the actual environment.

①Press the POWER key to turn on.

②Select the WBGT mode by pressing the MODE/Up key.

③Press the IN_OUT/Next key for more than 2 seconds to select a measuring ambient.

IN:When measuring indoors, or outdoors without direct sunlight

OUT: When measuring outdoors with direct sunlight

⚫Setting of Wind Speed

The WBGT index and globe temperature depend on the ambient wind speed. This instrument

enables correcting their values by assigning the wind speed to calculation. For a better

measurement, set the ambient wind speed properly.

Note: This instrument does not measure wind speed.

①Press the POWER key to turn on.

②Select the globe temperature (TG) mode by pressing the MODE/Up key. This setting

cannot be done in WBGT, air temperature, or humidity mode.

③Press the SET key for more than 2 seconds to show a current wind speed as below.

Example: Wind speed 0.3 m/s

④Change the wind speed. The figure increases when the MODE/Up key is pressed, and

decreases when the IN_OUT/Next key is pressed.

Note: The wind speed must be between 0.1 m/s and 3.0 m/s.

If there is no wind (0.0 m/s): Set the speed to 0.1 m/s.

If the wind reaches 3.1 m/s or more: Set the speed to 3.0 m/s.

Tip: WBGT index tends to be affected by wind speed a lot when it is slow while the index

is comparatively not relied on the wind when it is fast. Examples are given below.

A difference between the WBGT indices when the wind speed is set as 0.1 m/s

and 1.0 m/s: Around 0.4°C to 0.5°C

A difference between the WBGT indices when the wind speed is set as 3.0°C

and 4.0 m/s: Less than 0.1°C

(Where the air temperature 30.0°C, globe temp. 40.0°C, humidity 70.0%rh)

⑤Press the SET key for more than 2 seconds to fix the value and return to measurement

mode.

Note: The previously set value of wind speed will be resumed when the instrument is powered

off without determining the set value.

Estimating wind speeds with visual clues

Wind speed

Visual clues

Less than 0.4 m/s (1 mph)

Calm wind. Smoke rises vertically with little if any drift.

0.4 ‒ 1.3 m/s

(1 ‒ 3 mph)

Direction of wind shown by smoke drift, not by wind

vanes. Wind barely moves tree leaves.

1.8 ‒ 3.1 m/s

(4 ‒ 7 mph)

Wind felt on face. Leaves rustle and small twigs move.

Wind vanes move.

3.6 ‒ 5.4 m/s

(8 ‒ 12 mph)

Leaves and small twigs in constant motion. Wind blows up

dry leaves from the ground. Flags are extended out.

5.8 ‒ 8.0 m/s

(13 ‒ 18 mph)

Wind moves small branches. Wind raises dust and loose

paper from the ground and drives them along.

Abstracted from the reports from National Weather Service, U.S. Dept. of Commerce

https://www.weather.gov/pqr/wind

CAUTION

Never use the instrument out of its operating ambient or measuring range.

Abrupt change of ambient temperature can affect the measurement accuracy. Have the

instrument fully adapt to measuring ambient without condensing before use.

Handle the globe with great care. Damages on the globe or its finishing can influence the

measurement accuracy.

Hold Function

When measurement values are unstable, hold function is effective for easy reading.

①Press the HOLD key in the measurement mode.

HOLD indicator is lit and the measured value will be held.

②Press the HOLD key again to release the function.

HOLD indicator is turned off and the function will be released.

Maximum and Minimum Functions

Maximum (MAX) and minimum (MIN) measurement values can be displayed while taking

measurement.

①Press the MN/MX/RST key in the measurement mode. The display changes cyclically.

Measurement mode MIN MAX

②Press the MN/MX/RST key for more than 2 seconds to reset the MIN/MAX values. They

can be also cleared by turning the power off.

Note: The MIN/MAX values are constantly updated in all modes, except when the hold

function is activated.

Alarm Function

The alarm is triggered with sound of buzzer when the WBGT index exceeds the set value.

Note that this alarm cannot be set for air temperature, globe temperature, or humidity.

Note: This instrument is automatically turned off if it is not in operation for 20 minutes. In

case of using it for more than 20 minutes, release the auto power-off function.

* Refer to “Auto Power-Off Function” for details.

Note: The buzzer does not work when MIN/MAX values are displayed.

⚫How to Set Alarm Function

①Press the MODE/Up key to switch to the WBGT mode.

②Press the SET key for more than 2 seconds to start the alarm setting mode.

③Press the MODE/Up key to increase the value of the blinking digit.

Press the IN_OUT/Next key to change the digit to be edited.

Note: Set the alarm within the range of 20.0 to 49.9°C.

It is not possible to disable the alarm function.

④Press the SET key for longer than 2 seconds to confirm the setting.

Notice: If you turn the power off before confirming the alarm setting, the instrument recalls

the last fixed value for the alarm.

Auto Power-Off Function

If the instrument is not in use for more than 20 minutes, the power is automatically turned off

for power saving purpose.

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