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.
2.
3.
4.
5.
6.
7.
8.
9.
Sensor plug
LCD Display
F1 through F4 softkeys
Keypad
Printer paper and paper
compartment
AC Adapter jack
RS-232c TTL output
jack
Vane air velocity sensor
Temperature and
humidity sensor
housing (must be
opened before use)
9
1
2
3
4
8
5
7
6
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
Alphanumeric
Keypad
F2
F3
F4
Function
Soft-keys
Up / Down
Arrow keys
Display
Backlight
ON / OFF
Line
Feed
Printer
Paper Feed
Press to turn meter ON or OFF
Paper
Compartment
Keypad
Display
AC Adapter
RS-232 Interface
2
Sensor jack
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.
2.
3.
Press
F4
SET
from the WELCOME screen to access the 1st setup screen.
Use the
▲
or
▼
arrow keys to move the 1 cursor to the desired position.
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)
LCD Cont. (1 - 5): 3
Prn Cont. (1 - 9): 5
Auto Off: 20 mins.
Enable
EXIT
EDIT
PRN
NEXT
MAIN SETUP SCREEN 1
•
4.
5.
Auto Power Off Enable/Disable:
With the Auto Power Off disabled, the meter
will not automatically shut down.
Press
F1
EXIT
to exit the setup mode.
Press
F4
NEXT
to access the second setup screen for real time clock setup.
Setup Screen 2
1.
2.
Use the
▲
or
▼
arrow keys to highlight the
desired text to edit.
The order of DAY (DD), MONTH (MM), and
YEAR (YY) can be edited by highlighting and
pressing
F2
EDIT.
The Date and Time can be set by highlighting
with the
▲
or
▼
arrow keys and programming
with the alphanumeric keys.
Set Clock:
DD-MM-YY
HH:MM:SS
07-07-05 02:10:20
Set ID:
Disable
ID:
EXIT
EDIT
PRN
NEXT
3.
MAIN SETUP SCREEN 2
4.
5.
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.
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’.
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
√
FPM
V
√
F
T
√
%
RH
WBT
x F
√
CFM
VOL
EXIT
EDIT
PRN
NEXT
2.
MAIN SETUP SCREEN 3
4
Model 451181 Version 3.0 07/06
Measurement Procedure
Air Velocity, Temperature, Relative Humidity, and Wet Bulb Measurements
1.
2.
Turn the instrument ON by pressing the ON/OFF button.
Turn the temperature/humidity
sensor cover (located at the
center of the vane) to the
OPEN position. This will
expose the sensors to the air
flow in order to provide
temperature, humidity, and wet
bulb readings (see diagram).
Press
F1
MEAS
to enter the
measurement mode.
Hold the vane sensor in the
stream of air with the vane’s
temperature and humidity
sensors facing the oncoming
air stream.
Read the Air Velocity, Temperature, Relative Humidity, Wet Bulb Temperature, and
Air Volume readings on the LCD (see
diagram).
Use
F1
EXIT
to leave the measurement
window.
Use
F2
INPUT
to begin programming
the area of the duct, or other enclosure,
necessary for Air Volume (CFM / CMM)
measurements. Refer to the separate
section on Air Volume measurements.
Use
F4
PRN
to print the measurement
data (see next paragraph).
__
_
__
_
__
OP
E
3.
4.
N
CL
OS
E
5.
6.
7.
T:
75.7oF
V:
WBT:
66.1oF
EXIT
RH:
58.4%
98.0
FPM
VOL:
0.0CFM
PRN
INPUT
8.
9.
MEASUREMENT (MEAS) SCREEN
Move the rotating sensor cover to the closed position when the meter is not in use.
See diagram above.
Printing Measurements
1.
2.
3.
4.
Perform the Measurement procedure as described above.
Press
F4
PRN
and answer YES when prompted.
The instrument will print all the displayed data with
date/time stamps. See sample printout at right.
Press the LINE FEED button to feed the paper.
ACME CORP.
V: 600 MPH
T: 75.2 F
RH: 46.5%
WBT:61.3 F
VOL:174 CFM
06-17 01:49:07
SAMPLE PRINTOUT
5
Model 451181 Version 3.0 07/06
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