Extech Instruments 451181 User Manual
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Extech Instruments 451181 User Manual

Extech Instruments 451181 User Manual

Datalogging/printing anemometer + psychrometer
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User's Guide
Datalogging / Printing Anemometer +
Psychrometer
Model 451181
Introduction
Congratulations on your purchase of the Extech 451181 Datalogging / Printing
Anemometer + Psychrometer. This device simultaneously measures and displays Air
Velocity, Temperature, Humidity, Wet Bulb Temperature, and Air Volume (CFM / CMM).
The datalogger stores 2400 readings in Automatic Recording mode and 99 readings in
Manual Recording mode. The Printer provides a hard copy of individual readings while
the PC software permits downloading of data for use in spreadsheets, database, and
other programs. This meter is shipped fully tested and calibrated and with proper use will
provide years of reliable service.
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
FAX 781.665.0780 - TestEquipmentDepot.com
99 Washington Street
Melrose, MA 02176
Phone 781-665-1400
Toll Free 1-800-517-8431
Visit us at www.TestEquipmentDepot.com
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Summary of Contents for Extech Instruments 451181

  • Page 1 Psychrometer Model 451181 Introduction Congratulations on your purchase of the Extech 451181 Datalogging / Printing Anemometer + Psychrometer. This device simultaneously measures and displays Air Velocity, Temperature, Humidity, Wet Bulb Temperature, and Air Volume (CFM / CMM). The datalogger stores 2400 readings in Automatic Recording mode and 99 readings in Manual Recording mode.

  • Page 2: Meter Description

    Soft-keys Alphanumeric Keypad Display Backlight Up / Down ON / OFF Arrow keys Printer Line Feed Paper Feed Press to turn meter ON or OFF Paper Compartment Keypad Display RS-232 Interface Sensor jack AC Adapter Model 451181 Version 2.3 04/06...

  • Page 3: Operation

    The SET ID can be set to ENABLE if a custom ID will be used. Use the ▲ or ▼ arrow keys to highlight and F2 EDIT to change the setting. Press F4 NEXT to access the third setup screen’s ITEM list. Model 451181 Version 2.3 04/06...
  • Page 4 ▲ or ▼ arrow keys and MAIN SETUP SCREEN 3 then adjusting using F2 EDIT. Model 451181 Version 2.3 04/06 Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 FAX 781.665.0780 - TestEquipmentDepot.com...

  • Page 5: Measurement Procedure

    RH: 46.5% The instrument will print all the displayed data with WBT:61.3 F date/time stamps. See sample printout at right. VOL:174 CFM Press the LINE FEED button to feed the paper. 06-17 01:49:07 SAMPLE PRINTOUT Model 451181 Version 2.3 04/06...
  • Page 6 (diameter) key. Enter the duct’s diameter (in inches) using the numeric keypad and then press ENTER. Take an air velocity measurement as previously described. Read the CFM or CMM Air Volume measurement on the LCD. Model 451181 Version 2.3 04/06...
  • Page 7 Manual Datalogging Mode The Model 451181 has two datalogging modes, Manual Datalogging (99 records maximum) and Automatic Datalogging (2400 records maximum). This section covers Manual Mode and the following section covers Automatic Mode. Manual Datalogging basics To take a reading and store it in memory: Press F2 from the WELCOME screen.
  • Page 8 From the second memory display screen (discussed earlier), press F2 softkey. Answer when prompted to erase ALL recorded readings. Press to abort the clearing process. Model 451181 Version 2.3 04/06 Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 FAX 781.665.0780 - TestEquipmentDepot.com...
  • Page 9 Automatic Datalogging Mode In the Automatic Datalogging mode the Model 451181 can automatically measure and store 2400 readings at a programmed sample rate. To begin, press F3 from the WELCOME display to access LOG screens 1 and 2: LOG SCREEN 1...
  • Page 10 The datalogger will not start logging if the END date is set to a date before the current date. Software Instructions for downloading and saving data to a PC can be found on the software disk supplied with the meter. Model 451181 Version 2.3 04/06...

  • Page 11: Specifications

    -7.6 to 158.0ºF (-22.0 to Not specified 70.0 * Air Velocity Units • FPM (feet per minute) • KNT (knots) • KMH (kilometer per hour) • MPH (miles per hour) • MPS (meters per second) Model 451181 Version 2.3 04/06...

  • Page 12: Maintenance

    Hint: Folding the paper into a point allows the paper to “catch” a bit easier when feeding it through the slit (see diagram). New paper rolls are available through Extech Instruments and Extech distributors. NOTE: Thermal paper prints on only one side. Ensure paper is positioned properly as shown in diagram.

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