Extech Instruments 45320 Manual de usuario

User's Guide

Hygro-Thermometer

Model 45320

Introduction

Congratulations on your purchase of the Extech 45320 Hygro-Thermometer. The backlit

LCD displays temperature (in oC or oF) and relative humidity (%) simultaneously.

Maximum and minimum temperature and relative humidity readings can be stored and

recalled. Careful use of this meter will provide years of reliable service.

Specifications

Display Backlit E.L. (Electro-Luminance) LCD

Measurement ranges Temperature: 5.0oF to 122.0oF (-15.0oC to 49.9oC)

Relative Humidity: 25% to 95%

Accuracy Temperature: ±1.8oF (1oC)

Relative Humidity: ±5%

Sensor types Temperature: Thermistor

Relative Humidity: Resistive

Max/Min mode Record/Recall highest and lowest temperature & relative

humidity readings

Over range indication Dashes ‘------‘ will appear on the LCD for temperature or

relative humidity if a measurement is out of range

Low battery indication Displayed battery symbol superimposed with an ‘X’

Power supply Two (2) ‘AA’ 1.5V Batteries

Battery life 1 year (typical)

Dimensions Meter: 5.25 x 2.75 x 1.00" (133 x 70 x 25mm)

Probe: 7” (178mm) length; 1” (25mm) width

Sensor cable length 39” (1m)

Weight 6.7 oz. (190g) with battery

Model 45320 Version 1.6 10/06

Meter Description

1. Backlit LCD display

2. Push-button keypad

3. Probe in holder

4. Tilt stand and Battery compartment (rear)

Meter Operation

Meter Power

1. The 42530 is powered by two (2) ‘AA’ 1.5 V batteries.

2. Remove the protective decal that covers the LCD display by peeling it off by its corner.

3. Press the ON/OFF key to turn the meter on. If the display does not appear, check that

the batteries are installed and fresh. Note that a plastic tab, which must be removed

before use, may be installed in the battery compartment between one of the batteries

and the electrical contact.

4. Press the ON/OFF key again to turn the meter off.

Measurements

1. Slide the Temperature – Relative Humidity Probe up from its holder and hold it in the

air. Do NOT immerse the probe in liquid. Allow time for the readings to stabilize. Note

that the sensor need not be removed from its holder to operate.

2. The temperature (upper left) and relative humidity (right) measurements will appear on

the LCD.

3. The ‘Comfort Level’ display (Wet, Dry, or Comfort icons) will appear at the center of the

LCD. ‘Wet’ indicates that humidity is above 70%. ‘Dry’ indicates that the humidity is

below 40%; ‘Comfort’ indicates that the humidity is between 40% and 70%.

4. Note that the meter has a tilt stand located on the upper back area. Flip up the tilt stand

from its bottom edge for convenient desktop use.

Display Backlight

1. Press the backlight key (light bulb icon) to activate the display backlight. The backlight

will turn off automatically after approx. 5 seconds to conserve battery life.

2. Note that the backlight feature drains the batteries at a faster rate than normally would

be the case without the backlight turned on.

Selecting oC/oF units of measure

The temperature unit selector switch is located inside the battery compartment (back of

meter). Open the compartment and slide the switch to the desired position (oC or oF). The

LCD display will reflect the current selection.

MAX / MIN Feature

When the meter is turned on it begins keeping track of the highest (Max) and lowest (Min)

temperature and relative humidity readings. To view these readings at any time, press the

MAX/MIN key.

The maximum temperature and humidity readings will appear along with the MAX display

icon. Press the MAX/MIN key again to view the minimum temperature and relative

humidity readings. The minimum temperature and humidity readings will appear along with

the MIN display icon.

Press MAX/MIN key again to exit this mode.

To Clear the MAX/MIN readings, press the CLEAR key once with the MAX or MIN value in

the display. The meter will clear the existing records and begin storing new MAX/MIN

records. Note that the MAX/MIN records are automatically cleared when the meter is

turned off.

Comfort Level Feature

The Comfort Level display (‘Wet’, ‘Dry’, or ‘Comfort’ icons) will appear at the center of the

LCD.

For humidity measurements below 40%, the meter displays the ‘DRY’ icon. This region of

humidity can be harmful to furniture and other wood products where splitting and cracking

could occur after prolonged exposure. Electronic equipment is also at risk in this region

from static electricity.

For humidity measurements above 70%, the meter will display the ‘WET’ icon. Humidity

above 70% is not considered safe for dwellings or work areas where mold can form and

wood can swell and warp. In addition, sensitive objects such as artwork, musical

instruments, and paper documents can be damaged by high moisture.

Humidity between 40% and 70% is the most comfortable environment for people, furniture,

paper, artwork, etc. In this region the meter displays the ‘COMFORT’ icon.

Battery Replacement

When the low battery indicator appears (the letter ‘X’ over the battery symbol), replace the

two (2) 1.5V ‘AA’ batteries thusly:

Open the rear battery compartment by sliding the compartment cover to the right, replace

the batteries observing polarity, and close the compartment.

99 Washington Street

Melrose, MA 02176

Phone 781-665-1400

Toll Free 1-800-517-8431

Visit us at www.TestEquipmentDepot.com

Back to the Extech 45320 Product Info Page

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

FAX 781.665.0780 - TestEquipmentDepot.com

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