Extech 445715 Operating Manual

		User’s Guide Big Digit Remote Probe Hygro-Thermometer		TEMPERATURE
		Model 445715
				HUMIDITY
	Introduction		Calibration		MAX/MIN
					RESET
	Congratulations on your purchase of Extech’s Big Digit Remote Probe Hygro-		The following verification and calibration procedure requires a humidity
	Thermometer. It features Humidity and Temperature adjustments plus		chamber or the optional 33% and 75% RH reference bottles (445580-C).
	optional calibration salt bottles (445580-C). The remote probe (with 18”		RH Accuracy Verification
	cable) conveniently mounts on the meter or extends for measurements in
			Checking the 33% or 75% RH Calibration
	ducts or remote locations. This professional meter, with proper care, will
	provide years of safe reliable service.		1. Insert meter’s sensor into the 33% or 75% salt reference bottle or
	Meter Description		humidity chamber.
			Note: Slowly rotating the bottle will assist in placing it over the sensor.
			2. Allow the meter to stabilize for 1 hour at the reference RH and then verify
			that the reading is within the accuracy specification.
	1.	Temperature-Humidity Sensor	RH Calibration
	2.	LCD Display	1. Insert meter’s sensor into a 75% salt reference bottle or humidity
			chamber.
	3.	Max/Min	2. Check the reading after 1 hour.
	4.	Max/Min Reset	3. Adjust the RH calibration pot in ½ turn increments, waiting for the display
	5.	Wall Mount	to update after each adjustment, until the reading is within the accuracy
			specification.
	6.	Sensor cable storage	4. Repeat the RH accuracy verification procedure.
	7.	Stand	Note: If the salt at the bottom of the calibration bottles appears dry, the
	8.	Humidity calibration adjust	bottles should be replaced.
	9.	Temperature units switch (ºF/ºC)	Temperature Calibration
	10.	Temperature calibration adjust	1. Place the sensor in a stabilized environment of approximately 70°F
			(21°C).
	11.	Battery compartment cover
			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.
	Operation		Specifications

1.Open the battery compartment by pushing the cover on the rear of the instrument downward as indicated by the arrow. Remove the battery safety strip and the protective cover on the LCD display. The instrument is now ready for use.

2.The temperature units (ºF/ºC) can be selected via the switch located in the battery compartment.

3.The upper display indicates the temperature. The lower display indicates humidity.

4.Displaying the minimum and maximum values.

a.Press the MAX/MIN button. The highest value measured since the Reset button was last pressed appears on the display.

b.Press the MAX/MIN button again to display the lowest value measured since the Reset button was last pressed.

c.Press the MAX/MIN button again to return to normal display operation.

5.Resetting (clearing) the MAX/MIN memory.

a.Press and hold the RESET button for 1 second while in the MAX/MIN display mode to clear the memory and start recording new max/min values.

6.The unit can be wall-mounted or placed on a flat surface using the fold-out footing.

7.The low battery flag will appear on the display when the battery voltage is low. Replace the battery when this occurs.

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’ battery and replace the cover.

Copyright © 2004 Extech Instruments Corporation. All rights reserved including the right of reproduction in whole or in part in any form.

V1.2 12/04

	Range	Accuracy
Temperature	-10 to 60oC	+ 1.0oC within -10oC to 50oC
	14 to 140oF	+ 1.8oF within 14oF to 122oF
Humidity	10% to 99%	+ 4% RH within 25% to 85% RH and
		0 to 50oC or 32 to 122oF
Battery	1.5V 'AAA' cell

Calibration/Repair Services

Extech offers complete repair and calibration services for the products we sell. For periodic calibration, NIST certification or repair of any Extech product, call customer service for details on services available. Extech recommends that calibration be performed on an annual basis to ensure calibration integrity.

Warranty

EXTECH INSTRUMENTS CORPORATION warrants the basic instrument to be free of defects in parts and workmanship for one year from date of shipment (a six month limited warranty applies on sensors and cables). If it should become necessary to return the instrument for service during or beyond the warranty period, contact the Customer Service Department at [phone] EXTENSION 210 for authorization or visit www.extech.com for more information. A Return Authorization (RA) number must be issued before any product is returned to Extech. The sender is responsible for shipping charges, freight, insurance and proper packaging to prevent damage in transit. This warranty does not apply to defects resulting from action of the user such as misuse, improper wiring, operation outside of specification, improper maintenance or repair, or unauthorized modification. Extech specifically disclaims any implied warranties or merchantability or fitness for a specific purpose and will not be liable for any direct, indirect, incidental or consequential damages. Extech's total liability is limited to repair or replacement of the product. The warranty set forth above is inclusive and no other warranty, whether written or oral, is expressed or implied.

Support line [phone]

Technical support: Extension 200; E-mail: [e-mail] Repair & Returns: Extension 210; E-mail: [e-mail]

Product specifications subject to change without notice

For the latest version of this User’s Guide, Software updates, and other up-to-the-minute product information, visit our website: www.extech.com