Humidity Meters Selection Guide Overview

This document provides a comparative selection guide for various humidity measurement instruments offered by Extech Instruments Corporation. The guide categorizes products into four main types: Psychrometers, Hygro-Thermometers, Dataloggers, Indicators, and Specialty Meters.

1. Product Categories and Models

• Psychrometers: RH300, RH350, RH390, RH401
• Hygro-Thermometers: RH101, 4465CF, 445580, 44550
• Dataloggers: EA20, EA25, RH520, 42270/75, 407445
• Indicators: 445702, 445703, 445715, 445814, 445815
• Specialty Meters: HW30, 45158, 45160, 407412

2. Measurement Parameters and Features

The guide compares instruments based on their ability to measure or provide the following parameters and features:

• Relative Humidity (%)
• Temperature (including Dew Point and Wet Bulb)
• Infrared Thermometer capability
• Max/Min and Differential Temperature readings
• External Temperature Probe availability
• Remote Probe compatibility
• Calibration Solutions availability
• Big Digit Display
• Data Logging capability
• PC Interface
• Graphical Display
• Audible and/or Visual Alarm
• Real-Time Stamp
• NIST Traceability
• Time/Stopwatch functions
• Air Velocity measurement

3. Feature Distribution Among Models

The matrix of features (represented by dots) indicates which models support which parameters or features. For example:

• RH350 psychrometer supports a wide range of features including %RH, temperature, dew point, wet bulb, external probes, calibration solutions, big digit display, data logging, PC interface, graphical display, audible/visual alarms, real-time stamp, NIST availability, time/stopwatch, and air velocity.
• Dataloggers like RH520 and EA25 offer extensive data logging, PC interface, graphical display, and real-time stamping.
• Indicators such as 445715 and 445815 provide multiple measurement capabilities and alarms.
• Specialty meters like 407412 cover a broad spectrum of features including air velocity and multiple temperature measurements.

4. Usage and Application Recommendations

The guide implicitly suggests selecting instruments based on required measurement parameters and desired features such as data logging or alarms. Psychrometers and hygro-thermometers are suitable for basic humidity and temperature measurements, while dataloggers and specialty meters are recommended for advanced monitoring and data analysis.

5. Contact and Copyright Information

Extech Instruments Corporation, located at 285 Bear Hill Road, Waltham, MA 02451, provides contact via phone (781.890.7440) and fax (781.890.7864). The document is copyrighted © 2005 by Extech Instruments Corporation, with all rights reserved.