Digital Thermohygrometer

Feature

■ Displayed content:

■ Heat stress checker

Displays WBGT as a cautious level of five steps.

	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		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	21 to 25°C	Risk during very vigorous physical activity	Low in risk basically, but high in risk when doing vigorous exercise or heavy labor.
Safe	21°C or lower	Safe

WBGT is...

an acronym of wet bulb globe temperature, which is an index introduced from three elements related to biological heat balance: temperature, humidity, and heat radiation.

PC-7980TRH calculates WBGT from temperature and humidity based on a guideline by Japanese Society of Biometeorology.

■ Influenza checker

Displays absolute humidity as a cautious level of three steps.

	Absolute humidity	Environment for viruses	Countermeasures
Warning	7g/m3or less	Suitable for viruses. High risk of infection.	Increase temperature and humidity by using a humidifier
Caution	8 to 11 g/m3	Viruses can survive. Be cautious of infection.	Avoid a decrease in temperature and humidity.
Safe	12 g/m3 or more	Viruses cannot survive.	Keep the temperature and humidity at a reasonable level.

Absolute humidity is...

mass of water vapor contained in a unit volume of air, which can be used as a barometer of the probability of epidemics of seasonal influenza according to a report of "Absolute humidity as a deterministic factor affecting seasonal influenza epidemics in Japan", Makoto Shoji et al., 2011.

■ Temperature, humidity, and their maximum and minimum

Pressing "max" or "min" button switches the display from current temperature/humidity to today's maximum/minimum and yesterday's maximum/minimum.

Current temperature/humidity Max. temperature/humidity (today or yesterday) Min. temperature/humidity (today or yesterday) Example: Example: today's max. temperature/humidity Example: yesterday's min. temperature/humidity

At 0:00 midnight today's data of maximum and minimum changes to yesterday's data, and the previous yesterday's data is erased automatically.

■ Clock, WBGT, absolute humidity

Pressing "mode" button switches the display from clock to WBGT and absolute humidity.

Clock	WBGT	Absolute humidity
12/24-hr system switchabe	Unit: °C	Unit: g/m3

■ Alarm clock

Can be used as an alarm clock to ring at the set time every day.

■ WBGT alert

A buzzer sounds when the WBGT exceeds the set level.

Description

■ Caution

- Each value of a guide to a comfortable environment is a rough estimation to help you consider your health management. It does not directly protect you from heat stroke or influenza.

- Indicated alerts may vary from an official alert from a government.

■ Batteries included initially are for test use and may last shorter than their expected life.

Specifications

Cat. No.		1076-00
Product name		Digital Thermohygrometer
Model name		PC-7980GTI
Measuring range	Temperature	−9.9 to 50.0°C
	Humidity	20 to 90%rh
Accuracy	Temperature	±1.0°C (10 to 40°C) ±1.5°C (other)
	Humidity	±5%rh (40 to 70%rh, 20 to 30°C) ±8%rh (other)
Resolution	Temperature	0.1°C
	Humidity	1%rh
Sampling time		20 seconds
Detectors	Temperature	Thermistor
	Humidity	Resistive polymeric humidity sensor
Heat stress checker		WBGT (heat stress index) calculated and shown in 5 steps
Seasonal influenza checker		Absolute humidity (seasonal influenza index) calculated and shown in 3 steps
Alarm volume		75 dB
Operation ambient		−9.9 to 50.0°C, less than 90%rh without condensing or freezing
Materials		ABS resin, acrylic glass
Dimensions		100 (W) x 120 (H) x 17 (D) mm
Weight		143 g including batteries
Power		AAA battery x2
Battery life		Approx. 1 year (20°C, 50%rh)
Standard accessories		AAA battery x2, instruction manual