Cat.No.1051-00

Digital Thermohygrometer (guide for a comfortable environment) PC-5500TRH

Model
PC-5500TRH
This is a digital thermohygrometer that measures temperature and humidity. The unit displays the estimated values of temperature or humidity to achieve a comfortable environment.

Features

* The estimated value for comfortable environment is displayed
* Absolute humidity that gives indication for the prevention of seasonal influenza is displayed
* The WBGT index that is useful to prevent heatstroke is also displayed
* Influenza mode and Heatstroke mode are selectable by the mode switch
* The LED light and the buzzer sound are used to alert the alarm status
* Two installation methods: The unit can be installed on a desk or wall

Influenza mode

* Displays the absolute humidity used as a guideline for preventing seasonal influenza
* Estimated value to achieve the target value for comfortable environment is displayed.
The unit displays how much the humidity (%rh) should be increased for comfortable environment
* Color icons show the warning levels depending on the absolute humidity 
* The target value for a comfortable environment is set to 10g/m3, regardless of temperature.
The absolute humidity of 10g/m3 is in the "Caution" status for influenza.
The drawbacks of increasing the humidity include condensation or mold in a room.
Use the value as a guideline depending on your applications and surrounding.
* If absolute humidity is 10g/m3 or more, the estimated value for a comfortable environment is displayed as 0%rh

Heatstroke mode

* The unit displays by how much the temperature should be increased for preventing  heatstroke
* The estimated value to achieve the value for a comfortable environment is displayed depending on the WBGT index  The unit displayed by how much the temperature should be lowered for a comfortable environment.
* Color icons show the ambient status depending on the WBGT index.
* The target WBGT index for a comfortable environment is set to 27°C, regardless of humidity.
The WBGT index of 27°C is in the "Warning" status for heatstroke.
When doing vigorous exercise, there is still a risk of heatstroke even in a comfortable environment.
Use the value as a guideline depending on your application and surrounding.
* If the WBGT index is 27°C or less, the estimated value for a comfortable environment is displayed as 0°C

Specifications

Product Digital Thermohygrometer (guide for a comfortable environment)
Catalog No. 1051-00
Model PC-5500TRH
Measuring range Temperature 0.0 to 50.0°C
R. Humidity 20 to 95%rh
Absolute humidity 1 to 65g/m³ (calculated)
WBGT index 0 to 50°C (calculated)
Measuring accuracy Temperature ±1.0°C (at 10 to 40°C)
±1.5°C (at other range)
R. Humidity ±5%rh (at 20 to 30°C/40 to 70%rh)
±8%rh (at other range)
Resolution Temperature 0.1°C
R. humidity 1%rh
Absolute humidity 1g/m³
WBGT index 1°C
Sampling (Display update) about 30 sec.
Sensing element Temperature thermistor
Humidity Electric resistance change type humidity sensor
Operation ambient 0 to 50°C (lower than 95%rh (no freeze or condensing)
Storage ambient -10 to 50°C (no freeze or condensation)
Power requirement 3 AAA size batteries
Battery life approx. one year (in use of alkaline battery,  one alarm operation per day)
Materials ABS resin, acrylic resin
Dimensions approx. (W)120 x (H)170 x (D)25mm
Weight 280g (includes battery)
Accessories 3 AAA batteries (*one is set in a unit at our factory)
English manual

* A battery has been  installed in a unit at our factory for monitoring purpose.  So this battery life may be shortened.

 

Caution in Use

* Each displayed value is usable as a guideline to control airconditions and physical conditions
  These values do not directly prevent the heatstroke nor influenza.

* The indicated "Alert" or "Warning" in the heatstroke mode may be different from the official release in case to case.

Reference data

 

* Absolute Humidity

Absolute humidity is a unit for measuring humidity, which is defined as the mass of water vapor contained in a given volume of moist air.
Low absolute humidity means that the air is dry with low water content, while high absolute humidity means that the air is moist with high water content.
The correlation between absolute humidity and seasonal influenza epidemic was studied, and it was reported that the epidemic starts when the absolute humidity drops below 11 g/m3, according to Dr. Makoto Shoji (*).

 
Absolute Humidity Air dryness and seasonal influenza epidemic
7g/m³ or lower Air is extremely dry.  Highest rick of seasonal influenza epidemic.
8 to 11g/m³ Air is dry: Medium risk of seasonal influenza epidemic.
12 to 16g/m³ Air is wet: Low risk of seasonal influenza epidemic
17g/m³ or higher Air is very wet: Lowest risk of seasonal influenza epidemic.
 
Source: "Seasonal influenza epidemic and absolute humidity" by Dr. Shouji, Miyagi, Japan 

 

* WBGT Index

 

The wet bulb globe temperature (WBGT) index integrates the three factors of air temperature, humidity and radiation heat, each of which greatly affects the heat balance of the human body. The index is normally obtained using the dry, wet and black bulb temperature measurement values.
Measurement of wet or black bulb temperature requires considerable expertise, and the equipment handling and location are limited.
The unit calculates the WBGT index by using the measured temperature and humidity, in accordance with the "Guidelines to prevent heat disorder in daily life" of the Japanese Society of Biometeorology.
The WBGT index is low when the air temperature and humidity are low, while it is high when the air temperature and humidity are high.
The risk of heatstroke increases with the WBGT index. Thus, the determined WBGT index can be used as a guideline for preventing heatstroke.


[Guideline for preventing heatstroke in daily life]
 
WBGT Index Risk of occurrence in relation to physical activity Remarks
Danger
(Higher than 31°C)
Risk during any physical activity Risk of occurrence is high in the elderly, even in the resting state. 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 Regularly take adequate rest when exercising or doing vigorous work.
Caution
(Lower than 25°C)
Risk during very vigorous physical Basically low in risk, but high in risk when doing vigorous exercise or heavy labor
 
Source: "Guidelines to prevent heat disorder in daily life" of the Japanese Society of Biometeorology

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