Extech Instruments 451181 User 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.

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Model 451181 Version 3.0 07/06

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

ON / OFF

Line

Feed

Function

Soft-keys

Alphanumeric

Keypad

Display

Backlight

Printer

Paper Feed

Press to turn meter ON or OFF

Up / Down

Arrow keys

RS-232 Interface

AC Adapter

Paper

Compartment Keypad Display

Sensor jack

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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.

Enable

EXIT PRNEDIT NEXT

MAIN SETUP SCREEN 1

Set Clock:

HH:MM:SS

07-07-05 02:10:20

Set ID: Disable

ID:

DD-MM-YY

EXIT PRNEDIT NEXT

MAIN SETUP SCREEN 2

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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

RH %

WBT x F

VOL CFM

√

EXIT PRNEDIT NEXT

MAIN SETUP SCREEN 3

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Model 451181 Version 3.0 07/06

Measurement Procedure

Air Velocity, Temperature, Relative Humidity, and Wet Bulb Measurements

1. Turn the instrument ON by pressing the ON/OFF button.

2. 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).

3. Press F1 MEAS to enter the

measurement mode.

4. Hold the vane sensor in the

stream of air with the vane’s

temperature and humidity

sensors facing the oncoming

air stream.

5. Read the Air Velocity, Temperature, Relative Humidity, Wet Bulb Temperature, and

Air Volume readings on the LCD (see

diagram).

6. Use F1 EXIT to leave the measurement

window.

7. 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.

8. Use F4 PRN to print the measurement

data (see next paragraph).

9. Move the rotating sensor cover to the closed position when the meter is not in use.

See diagram above.

Printing Measurements

1. Perform the Measurement procedure as described above.

2. Press F4 PRN and answer YES when prompted.

3. The instrument will print all the displayed data with

date/time stamps. See sample printout at right.

4. Press the LINE FEED button to feed the paper.

SAMPLE PRINTOUT

T: RH:

WBT: VOL:

75.7oF 58.4%

V: FPM

66.1oF 0.0CFM

98.0

EXIT PRNINPUT

MEASUREMENT (MEAS) SCREEN

ACME CORP.

V: 600 MPH

T: 75.2 F

RH: 46.5%

WBT:61.3 F

VOL:174 CFM

06-17 01:49:07

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Model 451181 Version 3.0 07/06

Air Volume Measurements

Air Volume (CFM / MM) measurements require that the area of the duct or other enclosure

be known. The meter can calculate the area of rectangular and circular ducts or the user

can calculate the area and enter it manually. See details below:

1. Measure (in inches) the diameter of a circular duct or the length/width of a

rectangular duct. Optional: Calculate the duct area.

2. Press F1 MEAS from the WELCOME screen.

3. Press F2 INPUT softkey.

4. If the area (in square inches) has been manually calculated, press AREA and enter

the value using the numeric keypad; Press ENTER, then proceed to step 6.

Otherwise continue with step 5.

5. For rectangular ducts, press LxW (length x width) and enter the length (in inches)

of the duct (using the numeric keypad). Press ENTER and do the same for the

width. Press ENTER after the width is programmed. For circular ducts, press the D

(diameter) key. Enter the duct’s diameter (in inches) using the numeric keypad and

then press ENTER.

6. Take an air velocity measurement as previously described.

7. Read the CFM or CMM Air Volume measurement on the LCD.

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Model 451181 Version 3.0 07/06

Manual Datalogging Mode

The Model 451181 has two datalogging modes, MEM Manual Datalogging (99 records

maximum) and Automatic Datalogging LOG (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:

1. Press F2 MEM from the WELCOME screen.

2. Use the arrow buttons to select a memory location (1 through 99) shown in the

upper left hand corner of the LCD.

3. Press F2 MEAS and then take a measurement.

4. At any time during the measurement, press F4 SAVE or F1 ABORT.

Manual Datalogging Display screens 1 and 2

Manual mode uses two display screens as shown below. Each screen has its own

softkeys. Other than the softkey differences, the screens are identical, showing the

measurement results.

To get to the 1st memory screen press F2 MEM from the WELCOME screen. The first

Memory display screen will appear with the memory location number (1 through 99) shown

in the upper left hand corner.

Softkeys for Memory Screen 1

•F1 EXIT: Press to return to the WELCOME

screen

•F2 MEAS: Press to take a measurement.

ABORT (F1) and SAVE (F4) keys will be active.

Press SAVE to store the current reading in the

selected memory location. Press ABORT to

return to the previous screen.

•F3 EDIT: Press to begin customizing the header

in the current memory location. The ABORT

(F1), CLR (F2), BACK (F3), and ENTER (F4)

softkeys will be active. Customizing a header is explained in detail in the next section.

•F4 NEXT: Press to access the second Memory display screen. Memory screen two is

identical to screen 1 except that screen 2 has F1 EXIT, F2 CLR (clear), F3 PRN

(Print), and F4 BACK softkeys described below.

Softkeys for Memory Screen 2

•F1 EXIT: Press to return to the WELCOME

screen

•F2 CLR: Press to clear the header for the

selected memory location.

•F3 PRN: Press to print the data in the current

memory location.

•F4 BACK: Press to return to memory screen 1.

01: 07-06 05:42:50

V: 98.0FPM

T: 82.0loF

RH: 62.7%

WBT: 72.2oF

VOL: 0.0CFM

EXIT NEXTMEAS

MEMORY (MEM) SCREEN 1

EDIT

01: 07-06 05:42:50

V: 98.0FPM

T: 82.0loF

RH: 62.7%

WBT: 72.2oF

VOL: 0.0CFM

EXIT BACKCLR

MEMORY (MEM) SCREEN 2

PRN

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Model 451181 Version 3.0 07/06

Customizing a Memory Location Header

Using the F3 EDIT softkey in Memory screen 1, as described above, allows the user to

customize the header in the currently selected memory location.

1. Use the ▲or ▼arrow keys to step forward and backward in the header.

2. Use the BACK softkey to step backward

and erase characters while stepping.

3. Use the alphanumeric keypad to compose

a header. For example, press the ‘2’ key

and a window with the characters related

to the ‘2’ key will appear (namely,

2abcABC as shown in the diagram). Then

use the ‘2’ key again to scroll through the

character list. When the desired character

is highlighted the meter will automatically

place that character in the header.

4. F2 CLR is used to erase the header.

5. F4 ENTER is used to save the header.

Viewing Stored Readings

1. From the WECLOME screen, press F2 MEM

2. Use the ▲or ▼arrow keys to scroll through the memory locations that contain the

stored data.

3. Press F1 EXIT to return to the WELCOME screen.

Printing Stored Data

Proceed to the second memory screen as previously described and use F3 PRN to print a

data record. Use the ▲or ▼arrow keys to select the desired data location (0- to 99) to

print.

Erasing Data

From the second memory display screen (discussed earlier), press F2 CLR softkey.

Answer YES when prompted to erase ALL recorded readings. Press NO to abort the

clearing process.

01:

V: 98.0FPM

T: 82.0loF

RH: 62.7%

WBT: 72.2oF

VOL: 0.0CFM

EXIT NEXTMEAS

HEADER EDITING

EDIT

2abcABC

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Model 451181 Version 3.0 07/06

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 LOG from the

WELCOME display to access LOG screens 1 and 2:

LOG SCREEN 1

F1 EXIT:Press to return to the WELCOME

screen

F2 START:Press to begin automatic Datalogging

at the pre-set sampling interval. Datalogging will

begin at the date/ time programmed in the SETUP

mode (see below).

F3 SET:Setup mode (explained in detail in the

following section).

F4 NEXT:Advances to LOG SCREEN 2

described below:

LOG SCREEN 2

F1 P-PG:Access Previous Page (previous 100

stored readings)

F2 N-PG:Access Next Page (next 100 stored

readings)

F3 PRN:Print page

F4 BACK:Return to LOG SCREEN 1

Automatic Datalogging SETUP mode

As mentioned in Softkey Group 1 above, the F3 SET selection allows the user to configure

the datalogger for the following parameters:

BEGIN: Calendar date when datalogging will

automatically begin

START: Time of day that datalogging will begin

END: Calendar date when datalogging will end

SUSPEND: Time of day that datalogging will

cease each day

RATE: Sampling interval (time between recorded

readings)

EXPECT: Total number of readings (2400)

REMAIN: Memory locations remaining

The two SETUP screens are identical but for the softkey differences (see diagrams). The

softkey functions for both SETUP screens are as follows:

EXIT: Returns to WELCOME screen.

EDIT: Select display field for editing.

VIEW: Calls up the stored readings log.

NEXT: Switches to SETUP screen 2.

START: Activates the datalogger

CLR: Erases all readings stores in the automatic

datalogger memory.

PRN: Prints the datalogger memory record

BACK: Switches to the SETUP screen 1.

0001: 07-06 05:42:50

V: 98.0FPM

T: 82.0loF

RH: 62.7%

WBT: 72.2oF

VOL: 0.0CFM

EXIT NEXTSTART

LOG SCREEN 1

SET

0001: 07-06 05:42:50

V: 98.0FPM

T: 82.0loF

RH: 62.7%

WBT: 72.2oF

VOL: 0.0CFM

P-PG BACKN-PG

LOG SCREEN 2

PRN

EXIT NEXTEDIT

AUTO DATALOGGER SETUP 1

VIEW

Begin: 01-01-05

Start: 00:00:01

End: 02-02-05

Suspend: 23:59:59

Rate:

Expect: 2400 Points

Remain: 2393 Points

15 secs

START BACKCLR

AUTO DATALOGGER SETUP 2

PRN

Begin: 01-01-05

Start: 00:00:01

End: 02-02-05

Suspend: 23:59:59

Rate:

Expect: 2400 Points

Remain: 2393 Points

15 secs

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Model 451181 Version 3.0 07/06

To edit the fields in the datalogger display screens:

1. Use the up and down ▲or ▼arrow keys to scroll through the parameters.

2. When a parameter is highlighted, use F2 EDIT to open it for editing.

3. Use the alphanumeric keypad to edit the parameter.

4. Press F4 ENTER to save changes. Press F1 ABORT to cancel changes.

5. Press the F1 EXIT to return to the SETUP screen.

Recording Data in the Automatic Datalogging Mode

1. After configuring the datalogger using the SETUP screens as described above,

place the meter in position to take readings (a tripod mount is provided on the rear

of the instrument for convenience).

2. Press F3 LOG from the WELCOME screen and then press F2 START.

3. Recording will begin on the date and time programmed at the BEGIN and START

lines in the SETUP screen.

4. The Datalogger will record everyday from the START time to the SUSPEND time.

The last day that datalogging will take place is the date programmed in the END

line.

5. When the logging begins, the screen should indicate LOGGING...

6. If the screen does not indicate logging at the programmed start time, make sure the

START key was pressed. Also check the section below entitled “Automatic

Datalogging START and END date considerations” for troubleshooting.

7. To stop logging before the programmed SUSPEND time, press F1 STOP.

8. To view the data recorded, press F4 VIEW.

9. To print data from the list, press F3 PRN. Press F2 when the PRINT? display

appears.

10. To clear (erase) the recorded data, access the LOG mode from the WELCOME

screen. Select SET and then press and hold the CLR (clear) softkey until the

display prompts for confirmation. Select YES to delete all records, or NO to abort

the clearing process.

Automatic Datalogging START and END Date Considerations

1. If the START date is set to a date before the current date, the datalogger will start

the moment the START softkey is pressed.

2. 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.

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