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Extech Instruments RH25 User Manual

Extech Instruments RH25
6 pages
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USERGUIDE
HeatIndexPsychrometer
ModelRH25
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Extech Instruments RH25 Specifications

Measurements IconMeasurements
air temperature range-20 to 50 °C (-4 to 122 °F)
heat index range-46 to 205 °C (-50.8 to 401 °F)
dew point range-78 to 50 °C (-108.4 to 122 °F)
wet bulb range-20 to 50 °C (-4 to 122 °F)
wet bulb globe range-25 to 54.5 °C (-13 to 130 °F)
relative humidity range0 to 99.9% RH
Accuracy IconAccuracy
temperature accuracy±0.6 °C (1 °F)
relative humidity accuracy±3% RH @ 25 °C from 10 to 90% RH otherwise ±5% RH
Power IconPower
power supply1 x CR2032 Lithium Battery
Weight and Dimensions IconWeight and Dimensions
dimensions140 x 35 x 18 mm (5.5 x 1.4 x 0.7")
weight50 g (1.8 oz.)

Summary

Introduction

Description

Meter

Details the physical components of the Heat Index Psychrometer, including sensor and display areas.

Display

Defines the various readings and symbols shown on the LCD display, such as temperature, humidity, and memory indicators.

Operation

Keypad

Explains the function of each button (POWER, HOLD, MODE) for controlling the device and its modes.

Powering the meter

Instructions on how to turn the Heat Index Psychrometer on and off.

MAX/MIN/AVG Memory

Describes how to access and use the maximum, minimum, and average reading memory functions.

Data Hold

Details how to freeze the current displayed reading using the HOLD button.

Automatic Power OFF (Sleep) Mode

Explains the device's automatic power-off feature and how to temporarily disable it.

Selecting °C/°F units of measure

High Alarm for Heat Index and Wet Bulb Globe temperature

Error Message Displays

Appendices

Appendix A – Heat Index based on Temperature (°F) vs. Relative Humidity (%)

Provides reference data for Heat Index values based on temperature and relative humidity.

Appendix B - Heat Index based on Temperature (°F) vs. Dew Point (DP)

Provides reference data for Heat Index values based on temperature and Dew Point.

Appendix C - Heat Index and Health Effects

Explains the health impacts associated with different Heat Index ranges.

Battery Replacement

Specifications

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