Extech Instruments 445814 User Manual

User’s Guide  
Model 445814 Humidity Alert  
Humidity Indicator with Dew Point and Programmable Hi/Lo %RH Alarms  
Introduction  
Operation  
Calibration  
Preparation for use  
RH Calibration  
Congratulations on your purchase of Extech’s Humidity Alert Hygro-Thermometer.  
Humidity alarms warn when the %RH exceeds a pre-set HI or LO limit. It also  
features Humidity and Temperature calibration adjustments. The unit can be wall-  
mounted or placed on a flat surface using the fold-out stand. This professional  
meter, with proper care, will provide years of safe reliable service.  
Open the battery compartment by pushing the cover on the rear of the  
instrument downward as indicated by the arrow. Remove the battery insulating  
strip and the protective film cover on the LCD display.  
1. Insert meter’s sensor into a humidity chamber. The reference should be >70%  
RH.  
2. Check the reading after 1 hour.  
Temperature Units  
3. Adjust the RH calibration pot in ½ turn increments, waiting for the display to  
update after each adjustment, until the reading is within the accuracy  
specification.  
Select ºF or ºC units using the rear selection switch.  
Audible alarm  
Meter Description  
1.  
2.  
3.  
4.  
5.  
6.  
7.  
8.  
9.  
Temperature-Humidity Sensor  
%RH Display  
Dew Point Display  
Temperature Display  
%RH LED alarm  
Max/Min push button  
Reset push button  
Audible Alarm ON/Off switch  
Tilt Stand  
Temperature Calibration  
1. Place the sensor in a stabilized environment of approximately 21°C.  
2. Check the reading after 1 hour.  
3. Adjust the temperature calibration pot in ½ turn increments, waiting for the  
display to update after each adjustment, until the reading is within the  
accuracy specification.  
Select or using the rear selection switch to turn the audible alarm on or  
off.  
Maximum / Minimum display  
1. Press the MAX/MIN button. The highest value measured since the Reset  
button was last pressed appears on the display.  
2. Press the MAX/MIN button again to display the lowest value measured since  
the Reset button was last pressed.  
Battery Replacement  
Open the battery compartment by sliding the battery cover on the rear of the  
instrument downward as indicated by the arrow. Replace the 1.5V ‘AA’ batteries  
and replace the cover.  
3. Press the MAX/MIN button again to return to normal display operation.  
Resetting (clearing) the MAX/MIN memory  
10. Humidity calibration adjust  
11. Temperature units switch (ºF/ºC)  
12. Temperature calibration adjust  
13. Wall hanger  
1. Press the MAX/MIN button to enter the MAX/MIN mode.  
2. Press and hold the RESET button for 1 second to clear the memory and  
start recording new max/min values.  
Setting the %RH Alarm Limits.  
You, as the end user, are legally bound (Battery ordinance) to  
return all used batteries and accumulators; disposal in the  
household garbage is prohibited!  
14. Battery compartment  
1. Simultaneously Press and HOLD the MAX/MIN and RESET button until “HI”  
and the stored HI %RH limit appears flashing.  
2. Press the RESET button to set the Hi %RH limit. Hold the button in for rapid  
adjustment.  
You can hand over your used batteries / accumulators,  
gratuitously, at the collection points for our branches in your  
community or wherever batteries / accumulators are sold!  
Disposal: Follow the valid legal stipulations in respect of the  
disposal of the device at the end of its lifecycle  
3. Press the Max/Min button. “LO” and the stored LO %RH limit will appear  
flashing  
Cautions  
This device is not a toy and must not reach children’s hands. It contains  
hazardous objects as well as small parts that the children could swallow. In  
case a child swallows any of them, please contact a physician immediately  
4. Press the RESET button to set the LO %RH limit.  
5. Press the Max/Min button to turn on or off the alarm. The alarm icon  
appear in the display when the alarm is active.  
6. Press and hold the RESET button to save the settings and exit the mode.  
Alert  
will  
Specifications  
Do not leave batteries and packing material lying around unattended; they  
can be dangerous for children if they use them as toys  
Range  
Accuracy  
+ 1.0oC within -10oC to 50oC  
+ 1.8oF within 14oF to 122oF  
Temperature  
-10 to 60oC  
14 to 140oF  
10% to 99%  
In case the device is going to be unused for an extended period of time,  
remove the batteries to prevent them from training  
If %RH exceeds the HI limit or goes below the LO limit the alert will be  
activated. The alert consist of two flashing ‘ALERT” icons in the upper display,  
a flashing red light (for 60 seconds) and an audible buzzer (for 60 seconds)  
Expired or damaged batteries can cause cauterization on contact with the  
skin. Always, therefore, use suitable hand gloves in such cases  
Humidity  
+ 4% RH within 25% to 85% RH and 0 to  
50oC or 32 to 122oF  
+/-2oC. @ 20oC  
+/-3.6oF @ 68oF  
See that the batteries are not short-circuited. Do not throw batteries into the  
Dew Point  
-36 to 60oC  
fire.  
-32.8 to 140oF  
(2) 1.5V 'AAA' cell  
6 oz (169g)  
Battery  
Copyright © 2005 Extech Instruments Corporation. All rights reserved including  
the right of reproduction in whole or in part in any form.  
Weight  
Dimensions  
Display: 4.3x3.9x0.8” (109x99x20mm)  
Note: If subjected to an electrostatic discharge the meter may  
malfunction and require the user to perform a reset.  
V3.1 10/05  

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