Extech 451181 Operating Manual
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.
Meter Description
1. Sensor plug
2. LCD Display
3. F1 through F4 softkeys
4. Keypad
5. Printer paper and paper
compartment
6. AC Adapter jack
7. RS-232c TTL output
jack
8. Vane air velocity sensor
9. Temperature and
humidity sensor
housing (must be
opened before use)
The battery compartment is
located on the back of the
instrument. There are two (2)
tripod mounts; one on the rear
of the meter and one on the
rear of the vane handle.
F1 F2 F3 F4
Alphanumeric
Keypad
Up / Down
Arrow keys
Press to turn meter ON or OFF
ON / OFF
1
2
3
4
5
Line
Feed
Paper
Compartment
Function
Soft-keys
Display
Backlight
Printer
Paper Feed
Keypad Display
9
8
7
6
AC Adapter
RS-232 Interface
Sensor jack
2
Model 451181 Version 3.0 07/06
Operation
Press the ON/OFF button to power the meter. The WELCOME screen will appear along with
four softkey selections (F1 through F4):
Setup
The Setup Screens provides access to the LCD Contrast, Printer Contrast, Auto Power-Off
time, Auto Power-Off Enable/Disable, Calendar Clock, and View configuration.
Setup Screen 1
1. Press F4 SET from the WELCOME screen to access the 1st setup screen.
2. Use the ▲ or ▼ arrow keys to move the 1 cursor to the desired position.
3. The programmable parameters for the first setup screen are as follows:
• LCD Cont: Adjust the LCD contrast (1-5)
using the numeric keypad.
• Prn Cont: Adjust the print contrast (1-9)
using the numeric keypad.
• Auto Power Off Time: Set the time period
that the instrument will wait before
automatically shutting down (1 to 20
minutes)
• Auto Power Off Enable/Disable: With the Auto Power Off disabled, the meter
will not automatically shut down.
4. Press F1 EXIT to exit the setup mode.
5. Press F4 NEXT to access the second setup screen for real time clock setup.
Setup Screen 2
1. Use the ▲ or ▼ arrow keys to highlight the
desired text to edit.
2. The order of DAY (DD), MONTH (MM), and
YEAR (YY) can be edited by highlighting and
pressing F2 EDIT.
3. The Date and Time can be set by highlighting
with the ▲ or ▼ arrow keys and programming
with the alphanumeric keys.
4. 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.
5. Press F4 NEXT to access the third setup screen’s ITEM list.
LCD Cont. (1 - 5): 3
Prn Cont. (1 - 9): 5
Auto Off: 20 mins.
EXIT PRNEDIT NEXT
MAIN SETUP SCREEN 1
Set Clock:
DD-MM-YY
07-07-05 02:10:20
Set ID: Disable
ID:
EXIT
MAIN SETUP SCREEN 2
Enable
HH:MM:SS
PRNEDIT NEXT
3
Model 451181 Version 3.0 07/06
Setup Screen 3
1. Measurement parameters with a check mark will
be included on the measurement screen. Items
with an ‘X’ will not be shown in the measurement
screen. Use the ▲ or ▼ arrow keys to select an
item and then use F2 EDIT to change from ‘X’ to a
check mark or from a check mark to an ‘X’.
2. The unit of measure shown next to each
measurement parameter can also be altered by
first selecting with the ▲ or ▼ arrow keys and
then adjusting using F2 EDIT.
Select item
V FPM
TF
RH %
√
√
√
WBT x F
VOL CFM
EXIT
√
PRNEDIT NEXT
MAIN SETUP SCREEN 3
4
Model 451181 Version 3.0 07/06
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