Extech RH350 Operating Manual

User's Guide

SuperHeat Psychrometer

Models RH350 and RH355 (kit)

Introduction

Congratulations on your purchase of the Extech RH350 SuperHeat Psychrometer. This
device measures Differential Temperature (T1-T2, Air-T1, T1-DP), Humidity, Air
Temperature, Dew Point and Wet Bulb. Advanced features include built-in memory and
recall of up to 99 data points, Min/MAX/Average readings from the captured data, Data
Hold, selectable Auto Power Off, and an RS-232 interface for capturing readings to a PC
using optional 407752 software. Careful use of this meter will provide years of reliable
service.

Meter Description

1. Humidity Sensor & Air Temperature Sensor

2. Triple LCD Display

3. On/Off; Set Mode

4. Min/Max/Average; Reset Min/Max

5. Air, T1, Air-T1, Dew Point

6. T1 probe input

7. T2 probe input

8. T1-T2, T2, T1-Dew Point, Wet Bulb

9. Store Current Reading; Backlight

10. Hold; Recall Mode

11. RS232 port

Note: The battery compartment is located

on the rear of the instrument

Display Description

1. Air, T1, Air-T1, Dew Point, Low Battery

2. Temperature °C/°F

3. T2, T1-T2, T1-Dew Point, Wet Bulb

4. Temperature °C/°F

5. Date (month, day, year), Time (24 hour clock)

6. Memory Store/Recall Location

7. Relative Humidity %

8. Maximum, Minimum

9. Hold, Average

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2

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RH350/355 V2.1 8/08

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