Extech Instruments 42275 User manual

User's Guide
Model 42275 Temperature and Humidity Datalogger Kit
Model 42265 Temperature Datalogger Kit
Model SW276 Software and Cable (for 42276/42266)

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Introduction
Congratulations on your purchase of the Extech Datalogging kit. The following models
are covered in this manual:
Model 42275: Temperature & Humidity Datalogging Module plus docking station & WindowsTM Software
Model 42265: Temperature-only Datalogging Module plus docking station & WindowsTM Software
Model 42276: Temperature & Humidity Datalogging Module plus printing/docking station & Optional
WindowsTM Software
Model 42266: Temperature-only Datalogging Module plus printing/docking station & Optional WindowsTM
Software
Model 42270: Temperature and Humidity Datalogging Module
Model 42260: Temperature-only Datalogging Module
The Datalogging modules can be used to monitor the temperature of greenhouses,
warehouses, food transports, aircraft cabins, refrigerated trucks, containers, museums,
and HVAC equipment. The Model 42270 records Relative Humidity readings in addition
to temperature readings. Modules can store 16,000 (8000 temperature and 8000 %RH
for 42270) readings that can later be transferred to PC or directly printed using the Model
42276 Programmer/Printer (covered in a separate manual). Careful use of this device
will provide years of reliable service.
The datalogger display will not switch on until
activated through the software.
The datalogger module display will not switch on until it is activated by the software in the
LOGGER SET menu as described later in this manual. In LOGGER SET the user selects
the type of recording activation. When the logger begins to log data, the display and status
LEDs will switch on.

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Description
1. LCD display
2. Mounting hole
3. Docking station
4. Interface Cable
5. Status LEDs
6. Software CD
Displays
LCD Display
REC: Displayed while logging readings. Read the
‘Recording Status’ section for further details.
HI and LOW: Displayed when the High or Low Alarm limit
is exceeded. See ‘Alarm Status’ below for further
information.
RH%: Relative Humidity (42270 and 42275 only)
C or F: Temperature units.
COMM: Appears when Datalogger is communicating with a PC.
Recording Status Indication
Both the RED status LED and the display indicator ‘REC’ will flash every 5 seconds if the
sampling rate is set to 5 seconds or higher. If the sampling rate is set lower than 5
seconds, the indicators will flash every 1, 2, 3, or 4 seconds as programmed.
ALARM Status Indication
Both the YELLOW status LED and the display indicator ‘ALM’ will flash when the recorded
value is higher than the user programmed High Alarm value or lower than the Low Alarm
value. The Alarm status LED and the ‘ALM’ display indicator flash every 5 seconds if the
sampling rate is programmed for 5 seconds or higher. If the sampling rate is set lower than
5 seconds, the indicators will flash every 1, 2, 3, or 4 seconds as programmed.
Low Battery Indication
When the lithium battery voltage nears the critical operating level, the LCD displays ‘LO’.
To replace the battery, refer to the Battery Replacement section of this manual.
REC HI LOW COMM
RH%
oC
oF


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Main Screen
Diagram A: Main Screen
Cursor 1 and 2 Control
Click on a cursor line to select it. When you click the red cursor line, it turns bold red. When
you click the green, it turns bold green. The CURSOR STATUS field (lower left) shows the
cursor positions. As the Arrow keys are used to select the last record or the next record, the
cursor location numbers change to reflect their new position.
Left arrow key Moves to previous point on the current plot.
Right arrow key Moves to next point on the current plot.
<Shift>-left arrow key Moves back 10 points on the current plot.
<Shift>-right arrow key Moves forward 10 points on the current plot.
<Home> Moves to first visible point on the current plot.
<End> Moves to last visible point on the current plot.
Drag a cursor to move it
Click and drag the cursor with the mouse. The cursor tracks the mouse until you release the
mouse button. When the mouse button is released, the cursor snaps to the nearest data
point.
Offset Knob
You can use the Offset control in the DISPLAY CONTROL field (lower right) to optimize the
data viewing area. Press the up or down arrow key to increment or decrement the record
number (with corresponding date) in the graph.

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Zooming and Panning on Graphs
To zoom in a point, press the <Ctrl> key and click the left mouse button over the desired
point; you can release the <Ctrl> key after you press the mouse button. The view resolution
increases until the mouse button is released. To zoom out, click on the right mouse button.
To pan, press the <Ctrl-Shift> keys and click on the left mouse button over the desired point,
then drag the mouse to another point. The graph view scrolls so that the original point now
appears under the new mouse cursor location. You can drag the mouse anywhere on the
screen.
To restore the view to its original state (after zooming or panning), press and hold the left
mouse button to drag the Offset and Range knobs’ yellow line in the DISPLAY CONTROLS
section.
Data record number or Time display selection
Press the switch button and select between Record number and Time ( HR:MN:SC). The
record number and time will display in turn while pressing the switch button .
Warning message
A warning message will appear on the lower left if the Datalogger is disconnected from the
PC.
<< WARNING: Data Logger not plugged into interface module!>>
Display Control
After downloading or retrieving a record, the numbers on the "Offset" and "Range" knobs will
change to:
Offset: 0000/5000/10000/15000
Range: 50/250/500/1K/2K/4K/8K/12K/16K.

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Save File
To save a transferred data file:
Click on SAVE FILE, select a folder to save the file in, and name the data file.

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Retrieve File
Click on RETRIEVE FILE to retrieve a previously saved file from your PC.
To aid in reading a graph, a grid can be drawn on the graph. A dialogue box display at the
bottom left hand corner shows the appearance of this grid.(CONTROL LOCATION Cursor 1
and 2)
After retrieving a file containing Humidity records, the labels "Temperature" and "Humidity"
will appear at the beginning of the curves. If no Humidity data is transferred, only the
Temperature curve will appear.
The date and time of the first point appears on the left hand corner. The last point’s date and
time appears on the right hand corner.
MAIN SCREEN WITH SAMPLE DATA

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Com Port Setup
Select "Com. Port Setting". Select the COM port, Baud rate (9600), Data bits (8), Parity
(None) and Stop bits (1).
Select OK to accept settings, press Cancel to abort and exit.

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Datalogger Settings
Press LOGGER SETTING to access the menu page
Sample Point Setup
Number of Data Points
Select the number of data samples you wish the logger to collect: 1000 / 2000 / 4000/ 8000 /
12000 / 16000 Scroll up or down to find the value and then click OK to save.
For example, if you select 1,000 samples, the logger will stop collecting data (and will power
off ) when 1000 data points have been collected. Datalogging ceases when the datalogger is
full. The yellow LED will stop flashing when datalogging ceases.
Sample Rate
Select the sampling rate in seconds(from 1 to 7200). Scroll up to increase the time or down to
decrease the time in seconds. The defaults sample rate is 2 seconds.
Start Modes :
Schedule -
Sets the desired Start Date/Start Time for datalogging. The datalogger will start when the
clock reaches the user programmed time and date. Ensure that the datalogger is set to the
current date and time.
Magnetic -
Connect the PC to the Datalogger to setup the Magnetic start mode. Select Magnetic and
ensure that the datalogger is set to the current date and time. Press "OK" , enter the desired
ID , press"OK" To confirm theMagnetic start setting . To start datalogging in Magnetic mode,
pass a strongly magnetized object by the bottom of the datalogger. The LED will start
flashing. Flashing rate depends on the sampling rate programmed.
Immediate -
The datalogger starts recording when the “OK” button is pressed.

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Start Mode Setup
Datalogger Clock Setting
Click OK to set logger to PC system time.
Alarm Setting
The default High Alarm temperature is 85 C.
The default Low Alarm temperature is -40 C.
The default High Alarm for Relative Humidity is 100% .
The default Low Alarm Relative Humidity is 0% .
Select the desired High value or Low value by scrolling up or down.
The ALM LED flashes:
a. If the measured Temperature is higher than the HI
Alarm setting or lower than the LO Alarm setting.
b. Every second while the data is transferred to a PC.
c. Once every datalogging interval. For example, if the
sampling rate is set to 3 seconds, the ALM LED will flash
every 3 seconds.
Unit Setting
Temperature can be
displayed in " C" and " F"

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Data Logger Id Setting
The datalogger's ID setting allows the user to provide a unique name for each datalogger
(up to 8-digits).
Sleep Mode Setting
In Sleep Mode the Datalogger turns the display off after Datalogging has been completed.
Select the Sleep Mode in software by moving the slide switch to the right for SLEEP then
click OK.
If NON-SLEEP is selected, the logger will continually display the current Temperature /
Relative Humidity. (The default is Non-Sleep)

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Data Table
Press the DATA TABLE icon to view data
Edit Cell
Double-Click on the desired cell to edit (or press <F2>)
Data pop-Up Menu
Click the right mouse button anywhere in the data table to activate the pop-up menu. The
menu contains Goto, Find, and Sort. Goto Specify a target cell to go to, using its row and
column. There are a total of 200 rows from cursor 1 to cursor 2 . Key in the desired row and
column, then press "OK". The cursor will move to the desired destination. Find Search for a
text string in all of the alpha-numeric cells in the entire table, or in a selection range. After the
initial search, you can press <F3> to find the next occurrence of the same text string, or you
can press <Shift-F3> to search backwards for the next occurrence of the text string. Sort If a
range of cells is selected, you can sort the cells using the data in one of the rows or columns
as the sort key.

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To choose a column click on the
appropriate button (Number, Date, Time,
Temp, Humidity); the whole column will
darken indicating that it is selected. In the
Orientation portion of the window, there
are four sorting options:
1. Sort by Ascending Row Values.
2. Sort by Descending Row Values.
3. Sort by Ascending Column Values.
4. Sort by Descending Column Values.
When searching for specific data in a file you can optimize your search using the Find menu.
Copying and Pasting
Copy one or more cells to the clipboard by clicking the left mouse button and then pressing
and holding the <Shift> button to select the area. Paste the contents of the clipboard into a
table by pressing <Ctrl-V> after selecting the cell(s) into which you want to paste the data.

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Statistics
Press the STATISTICS icon to view histograms of data based on the "Whole Range" or the
"Cursor Range". See (Diagram I)
Whole Range - All of the logged readings.
Cursor Range - Only the readings between the two cursors.
1. Click and drag the knobs’ yellow line (shown in the left side of Diagram I-1) to equally
divide all sample readings into 4 divisions (up to 130). This can also be done by clicking on
the UP/DOWN arrows or by keying in the value directly.
2. Refer to the top of Diagram I-1, you’ll notice that there are 1021 logged readings at 44°C.
There are also 213 readings between the two cursors at 62.7°C
3. If you place all of the logged readings into 100 divisions, the histogram for the Whole
Range will reflect the change.

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4. Diagram I-2 is another example of setting the cursor range; it has been set to 100
divisions as well.
5. Diagram J-1 shows that cursor 1 is used for the temperature readings and the lower
region shows the Relative Humidity records. In Diagram J-2 the divisions are set to 130.
6. Diagram I is a Temperature example using Diagrams I-1 and I-2 as data sources.
Diagram J is a Temperature and Humidity example using Diagrams J-1 and J-2 as data
sources.
7. The right side of Diagram I indicates Maximum, Minimum, Mean and Standard
Deviation (Std.Dev) values for Whole Range (upper part) and Cursor Range (lower part)
temperatures.
Maximum: The highest reading in Whole Range or Cursor Range.
Minimum: The lowest reading.
Mean: The Average reading.
Std. Dev.: A calculation of the deviation between each reading
and the Mean value (See Diagram I-1 ).
Print Graph
Press the PRINT icon to print the graph.

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Group Files
Click GROUP FILES to view the "Multi-Logger Monitor" designed
to view and compare data files. Diagram M shows the screen as it
appears before the icon is clicked. Select the color of the curve by
clicking the color block. You can print the data by clicking the printer
icon at the right top corner.
Note: To retrieve a file to replace the current file shown on the graph:
a. Select the file that you want to replace.
b. Choose transparent from the color selections (graph disappears).
c. Select the file you want to retrieve.

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Click to select the file you want to use to compare to other files,
click the color icon box to select the desired color. Each file is
represented by a capital letter (A through H) with the file name
following the letter.
When comparing data
files:
Diagram M shows the
main screen before a file
is retrieved.
Diagram N shows the
main screen with an
example file loaded.
The offset and range
settings can be changed
by moving the indicator
on the yellow rotating
knob (refer to Diagram
O).
Temperature Chart
The Temperature Chart displays the data after all readings are
completely downloaded.
Cursor Status
The Cursor Status indicates the exact positions of Cursor 1 and 2.
Diagram N

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Previous Setting:
Previous setting records are listed in this column for reference.
To download data from another datalogger without exiting the
current screen:
a) Click “PREVIOUS SETTING"to replace the last logger data
with a new one.
b) Close the program and reopen again.
Note : Clicking on "Retrieve File" will not download from a new
datalogger; you must follow the above instructions.

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Message
The message area is blank if no file has been retrieved. After a file is
retrieved the message will display as follows:
"Retrieve file completed"
Download Commands
Start - To begin downloading data .(See below diagram)
Stop - To manually stop downloading data.
Exit - To exit the Download utility.
Display Control
Offset - Allows the user to select a point in the
reading log to begin
viewing the data. See the examples below.
Example 1: Set the Offset by clicking and dragging the red indicator
to the "0000", Range (Diagram R-1) The screen shows 0001 as
the starting point for the 8,000 record total.