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User’s Guide

Model 445814Humidity Alert

Humidity Indicator with Dew Point and Programmable Hi/Lo %RH Alarms

Introduction

Congratulations onyour purchase of Extech’s Humidity Alert Hygro-Thermometer.

Humidity alarms warn when the%RH exceeds a pre-set HI orLO limit. It also

features Humidity and Temperature calibration adjustments. The unit can be wall-

mounted or placed on a flat surface usingthe fold-out stand. This professional

meter, with propercare,will provide years ofsafe reliable service.

Meter Description

1.Temperature-Humidity Sensor

2.%RH Display

3.Dew Point Display

4.Temperature Display

5.%RH LED alarm

6.Max/Min push button

7.Reset push button

8.Audible Alarm ON/Off switch

9.Tilt Stand

10.Humidity calibration adjust

11.Temperatureunits switch (ºF/ºC)

12.Temperature calibration adjust

13.Wall hanger

14.Battery compartment

Cautions

This device is not atoyand must not reach children’s hands. It contains

hazardous objects as well as small parts that thechildren couldswallow. In

case a child swallows any of them, pleasecontact a physician immediately

Do notleave batteries and packing material lying around unattended; they

can be dangerous forchildren if they use them as toys

In case the device isgoing to be unused for an extended period of time,

remove the batteries to prevent themfrom training

Expired or damaged batteries can cause cauterization on contact with the

skin. Always, therefore, use suitable handgloves in such cases

See that the batteriesare not short-circuited. Do not throw batteriesinto the

fire.

Copyright © 2005 Extech Instruments Corporation. All rights reserved including

the right of reproduction in whole or in partin any form.

www.extech.com

V3.1 10/05

Operation

Preparation foruse

Open the battery compartment by pushing the cover on the rearof the

instrument downward as indicated by thearrow. Remove thebattery insulating

strip and the protective film cover on the LCD display.

Temperature Units

Select ºF or ºC unitsusing the rearselection switch.

Audible alarm

Selectorusing the rear selection switch to turn the audiblealarmon or

off.

Maximum /Minimum display

1.Press the MAX/MINbutton. The highest value measured since the Reset

button was last pressed appears on the display.

2.Press the MAX/MINbutton again to display the lowest value measured since

the Reset button was last pressed.

3.Press the MAX/MINbutton again to return to normaldisplay operation.

Resetting (clearing)the MAX/MINmemory

1.Press the MAX/MINbutton to enter the MAX/MIN mode.

2.Press and hold the RESET button for1 second to clearthememoryand

start recording new max/min values.

Setting the %RH AlarmLimits.

1.SimultaneouslyPress and HOLDthe MAX/MIN and RESET buttonuntil “HI”

and the stored HI%RH limitappears flashing.

2.Press the RESET button to set the Hi%RH limit. Hold thebutton in for rapid

adjustment.

3.Press the Max/Min button. “LO”and the stored LO %RH limit will appear

flashing

4.Press the RESET button to set the LO%RH limit.

5.Press the Max/Min button to turn on or offthe alarm. The alarmiconwill

appear in the display when the alarmis active.

6.Press and hold the RESET button to save the settingsand exit the mode.

Alert

If %RH exceeds theHI limit or goes below the LO limit thealert will be

activated. The alert consist of two flashing ‘ALERT” icons in the upper display,

a flashing red light (for60 seconds) and an audible buzzer (for60 seconds)

Calibration

RH Calibration

1.Insert meter’s sensor intoa humidity chamber.The reference should be >70%

RH.

2.Check the reading after1 hour.

3.Adjust the RH calibrationpot in ½turn increments, waiting for the display to

update after each adjustment, until the reading is within the accuracy

specification.

Temperature Calibration

1.Place the sensor in astabilized environment ofapproximately21°C.

2.Check the reading after1 hour.

3.Adjust the temperature calibration pot in ½turn increments, waitingfor the

display to update aftereach adjustment, untilthe reading is within the

accuracy specification.

Battery Replacement

Open the battery compartment by sliding the battery cover on the rear of the

instrument downward as indicated by thearrow. Replace the 1.5V ‘AA’batteries

and replace the cover.

You, as the end user,are legally bound (Battery ordinance) to

return allused batteriesand accumulators;disposal in the

household garbage is prohibited!

You can hand over yourused batteries / accumulators,

gratuitously, at the collection points forourbranches in your

community or wherever batteries / accumulators are sold!

Disposal: Follow the valid legalstipulations in respect of the

disposal of the device atthe end of its lifecycle

Specications

Range Accuracy

Temperature-10 to 60

oC

14 to 140

oF

+ 1.0oC within -10oC to 50oC

+ 1.8oF within 14oF to 122oF

Humidity10% to 99%+

4% RH within 25%to 85% RH and 0to

50oC or 32 to 122oF

Dew Point-36 to 60

oC

-32.8to 140

oF

+/-2oC.@ 20

oC

+/-3.6oF @ 68oF

Battery(2) 1.5V 'AAA' cell

Weight6 oz (169g)

DimensionsDisplay: 4.3x3.9x0.8” (109x99x20mm)

Note: Ifsubjected to anelectrostatic discharge themeter may

malfunction and require the user toperform a reset.

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