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INSTRUCTION MANUAL Model 407445 Heavy Duty Hygro-Thermometer Introduction Congratulations on your purchase of Extech’s Heavy Duty Hygro-Thermometer. The Model 407445 displays Temperature & Relative Humidity simultaneously and includes a built-in PC interface. This professional meter, with proper care, will provide years of safe reliable service. Page 1 Model 407445 Version 2.2 February 2004 Specifications General Specifications Display Measurement Data Hold Sensor types Memory Recall Power off Data Output Sampling Time Operating Temperature Operating Humidity Power Supply Power Consumption Weight Size Dual function LCD display with contrast adjustment Relative Humidity (RH) and Temperature (°C & °F) Freezes Display Humidity: Thin film, capacitance sensor Temperature: Thermistor Records/Recalls MAX, MIN, and Average readings Automatic power off after approx 10 minutes of inactivity RS 232 PC serial interface Approximately 0.8 seconds Instrument: 32 to 122°F (0 to 50 °C) Probe: 32 to 140°F (0 to 60°C) < 90% RH 9V battery Approx. 8.5 mA DC 0.76 lbs. (345 g) including batteries & probe Instrument: 7.1 x 2.8 x 1.3" (180 x 72 x 32mm) Sensor head: 1” diameter x 6.3” (26mm x 160mm) Range Specifications Range RH 10% to 95% RH Resolution 0.1% RH 0.1ο F/C Accuracy > 70% RH: ± 4% RH < 70% RH: ± 3% RH ± 1.5 οF (± 0.8οC) Temperature 32οF to 122οF (0οC to 50οC) Page 2 Model 407445 Version 2.2 February 2004 Meter Description 1. 2. 3. 4. 5. 6. 7. 8. Sensor input RS-232 serial output jack LCD Display Keypad Sensor LCD contrast adjustment Protective rubber jacket Battery compartment and calibration pots on rear Page 3 Model 407445 Version 2.2 February 2004 Meter Operation Getting Started 1. 2. 3. 4. Plug the sensor into the sensor jack at the top of the meter. Press the Power OFF/ON key to turn the instrument on or off. Select the temperature units by pressing the °C/°F key. The display will indicate "°C" or "°F" as selected. The meter will now display the per cent relative humidity and the temperature. NOTE: For accurate relative humidity measurements the meter should be allowed several minutes to adjust to ambient temperature changes. Data Hold Press the Data Hold key to freeze the displayed temperature and humidity readings. The HOLD icon will appear on the display in the Data Hold mode. Press the Data Hold key again to exit the Data Hold mode. MAX, MIN, and AVG Record / Recall 1. Press the RECORD key to begin. The REC indicator will appear on the display and the meter will begin tracking the highest (MAX), lowest (MIN), and average (AVG) readings. 2. Press the RECALL key to display the highest (MAX) reading. The MAX indicator along with the maximum reading recorded since RECORD was first pressed will appear. 3. Press the RECALL key again to view the lowest (MIN) reading. 4. Press the RECALL key again to view the average reading (AVG). 5. To exit, press the RECORD key. Measurement Considerations 1. The meter includes an Auto Power OFF feature that turns the instrument off after approximately 10 minutes of inactivity. To disable this feature, press the RECORD key to enable the MIN/MAX/AVG function. 2. It may be necessary to adjust the display contrast due to a change in viewing angle or voltage drift. Use the LCD contrast adjustment located on the right side of the meter. Page 4 Model 407445 Version 2.2 February 2004 RS-232 Serial PC Interface This instrument includes a built-in RS-232 serial data port. This interface is intended for use with the Extech Data Acquisition Software (PN 407001). For more information, contact Extech or refer to the manual accompanying the 407001 software package. Battery Replacement 1. The low battery indicator (LBT) appears on the left corner of the display when the battery requires replacement. Reliable readings can be obtained for several hours after the first appearance of the low battery indicator. 2. To replace the battery: a) Remove the rubber jacket that encases the meter. b) Open the rear battery compartment using a small coin or screwdriver. c) Replace the 9V battery and re-assemble the meter. Page 5 Model 407445 Version 2.2 February 2004 Calibration Humidity Calibration Note: Calibration reference solutions are available from Extech (33%: Part No. 407453 and 75%: Part No. 407465). 1. The grid located on top of the sensor must be removed so that it may fit into the calibration bottles. 2. Prior to calibrating, allow the meter and probe to stabilize to room temperature. 3. Open the battery compartment to access the calibration adjustments (see diagram below). 4. Place the sensor head into the 33% calibration reference solution. Wait for a stable reading (up to 30 minutes). Adjust VR3 until the display reads 33.0%. 5. Place the sensor head into the 75% calibration reference solution. Wait for a stable reading (up to 30 minutes). Adjust VR4 until the display reads 75.0%. Temperature Calibration Note that the temperature calibration adjustments are rarely required. However if a temperature calibration is in order, the user must have access to an environmental o o chamber capable of providing 21 C and 50 C conditions. Allow time for the chamber and the meter sensor to stabilize (30 minutes approx.) and then adjust the appropriate potentiometer (see below): • VR7 - Temperature 21 C adjustment o o • VR6 - Temperature 50 C adjustment Page 6 Model 407445 Version 2.2 February 2004 Calibration and Repair Services Extech offers repair and calibration services for the products we sell. Extech also provides NIST certification for most products. Call the Customer Service Department for information on calibration services available for this product. Extech recommends that annual calibrations be performed to verify meter performance and accuracy. Page 7 Model 407445 Version 2.2 February 2004 Warranty EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects in parts and workmanship for one year from date of shipment (a six month limited warranty applies to 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 (781) 890-7440 ext. 210 for authorization or visit our website www.extech.com for contact 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 (781) 890-7440 Technical support: Extension 200; E-mail: support@extech.com Repair & Returns: Extension 210; E-mail: repair@extech.com 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 Extech Instruments Corporation, 285 Bear Hill Rd., Waltham, MA 02451 Copyright © 2005 Extech Instruments Corporation. All rights reserved including the right of reproduction in whole or in part in any form. Page 8 Model 407445 Version 2.2 February 2004