42270/42275/42260/42265 Temperature & Humidity Datalogger

User's Guide
Model 42270 Temperature & Humidity Datalogger Module
Model 42275 Temperature & Humidity Datalogger Kit
Model 42260 Temperature Datalogger Module
Model 42265 Temperature Datalogger Kit
Congratulations on your purchase of the Extech Datalogging Module or Datalogging kit.
The following models are covered in this manual:
Model 42270: Temperature and Humidity Datalogging Module
Model 42275: Temperature & Humidity Datalogging Module plus docking station & WindowsTM Software
Model 42260: Temperature-only Datalogging Module
Model 42265: Temperature-only Datalogging Module plus docking station & WindowsTM Software
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 readings that can later be transferred
to PC or directly printed using the Model 42276 Programmer/Printer. Careful use of this
device will provide years of reliable service.
Activating The Digital Display
The datalogger module display will not switch on until it is placed in the docking station,
connected to the PC, and 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.
3-digit multi-function LCD
Front panel status LEDs
Two (2): RECORD and ALARM
Temperature range
-40 to 185 F (-40 to 85 C)
Temperature resolution
Temperature accuracy
0.1 up to 99.9 ; 1 from 100 to 185
±1.2 F (0.6 C) from -4 to 122 F (-20 to 50 C)
±2.4 F (1.2 C) all other ranges
Humidity range & accuracy 0.0 to 99.9% Relative Humidity; Accuracy: ± 3%
Datalogger storage
16,000 temperature readings (8,000 temperature and 8,000
humidity readings on the 42270)
Sampling rate
Programmable from 1 to 7200 seconds (2 hours)
Power supply
Battery Life
Low battery indicator
One (1) CR2 or ½ ‘AA’ lithium battery
1 year: 5 second sample rate in sleep mode
3.8 months: 24 hour sample rate in non-sleep mode
Display shows ‘LO’
Cable length
60’’ (150cm)
Operating Temperature
32 to 104 F (0 to 40 C) (docking station)
Operating Humidity
10 to 80% RH (docking station)
4.9 x 3.6" (124 x 92mm)
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Refer to Figure 1.
LCD display
Mounting hole
Docking station
Interface Cable
Status LEDs
Software CD
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
RH%: Relative Humidity (42270 and 42275 only)
C or F: Temperature units.
COMM: Appears when Datalogger is communication 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.
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Software Installation and Operation
1. Slide the logger onto the RS-232 PC Interface docking station.
2. Connect the PC interface cable to the PC com port (1 or 2).
3. Insert the supplied software disk in the PC CD-ROM drive.
4. The main software screen will appear with the following selections:
• INSTALL SOFTWARE: Click to install the software
• WEBSITE: Visit website
• BROWSE CD-ROM: View all items on the CD-ROM
• EXIT: Close the software
• MANUAL PDF: Open the operation manual in PDF format
Main Software Screen
Cursor 2
Cursor 1
When the software is run, the window shown in Figure 2 (above) will appear. The window
items are described below. If the PC and Datalogger are not communicating, the following
error message will appear on the lower left hand corner of the software screen.
<<WARNING: Datalogger not plugged into interface module!>>. If this occurs, check the
COM Port settings under the ‘Com Set’ button located on the top row of the software
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Retrieve File
Open a data file currently stored on the PC.
Save File
Save data to a new file on the PC.
Set the COM Port number, baud rate, data bits, parity, & stop bits.
Logger Set
The Datalogger must be configured before each recording session using the following
parameters (refer to Figure 3):
• Sample Points: Number of data points to log (1000, 2000, 4000, 8000, 12000, 16000)
• Sample Rate: Set from 1 to
7200 secs (logging interval).
• Start Mode: IMMEDIATE
(recording starts when OK is
selected), SCHEDULE (see
Start Date/Time below),
MAGNETIC (recording
begins when a magnet is
passed over back of the
• Start Date and Start Time:
Set date/time when
Datalogger is to begin
recording data.
• Unit: Select C or F for
temperature recording only.
Select C with humidity or F
with humidity for
temperature and humidity
recording (only the 42270
can record humidity).
• High and Low Alarm: Temperature limits that, if exceeded, enable the front panel
‘ALARM’ LED and the LCD icon ‘ALM’ to flash.
• Logger Date and Logger Time: Set the Datalogger’s internal real-time clock.
• Sleep Mode: When enabled, the Datalogger automatically shuts off after 10 minutes.
• Logger ID setting: Unique name given to each Datalogger (up to 8 characters).
Data Table
View a list of all the data. Right-click in the list window to call up the following commands:
• GOTO: Specify a target cell to locate using its row and column.
• FIND: Search for a text string in all of the alpha-numeric cells in the entire table or for a
selected range.
• SORT: First right-click on a column header in the Data Table. Now sort the cells using
the data in one of the rows or columns as the sort key.
Note that in the table, data can be cut (ctrl-c) and pasted (ctrl-v).
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Statistics can be applied to all the data or only the data between the moveable cursors
located on the main software screen.
• The Temperature data is shown on
the top graph and the Relative
Humidity (42270 only) on the
bottom graph.
• The max, min, mean, and standard
deviation values are shown on the
right side of each graph.
• Use the mouse to adjust the yellow
knobs (left side of Statistics screen
shown in Figure 4) to equally divide
all readings into divisions (up to
130 divisions are possible). This
can also be done by clicking the
up/down arrows or by keying in the
value directly.
Group Files
Click Group Files to view the ‘Multi Logger Monitor’ designed to view and compare data
files. Figure 5 shows the screen as
it appears before a file icon (top of
screen) is selected.
• To open a file in the ‘Multi
Logger Monitor’, click on the file
open icon next to the color
block. The filename will appear
next to the letter designation
and the data will appear in the
grid when a file is selected.
• Select the color of the curve by
clicking the color block next to
the file names.
• Use the OFFSET and RANGE
controls to manipulate the view
as described in Offset and
Range knob sections below.
• Print the data by clicking the print icon at the top right of the screen.
Temperature and Relative Humidity displays on Main Software Screen
Refer to Figure 2 for the Main Software Screen. The temperature and humidity readings
are represented on the main grid of the software window after data is transferred from PC.
The temperature units are shown on the left side of graph and the humidity units on the
right. Note that only the 42270 module provides Relative Humidity data. Use the
OFFSET and RANGE knobs located on the bottom right of the main software screen to
manipulate the data view. Details on their use are provided below:
The Offset knob allows the user to select the data point that appears on the left-hand side
of the data graph on the main software screen. With the knob set to ‘0000’, the beginning
of the data list will be shown on the left side of the display graph. With the knob set to
2500, reading number 2500 will start on the left side of the display graph.
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Use the Range knob to select the number of readings represented on the display graph. If
the knob is set to ‘50’, fifty readings will be shown on the display graph. With the knob set
to ‘2K’, two thousand readings will be represented on the display graph.
Cursor 1 and 2
Cursor 1 and Cursor 2 (red and green vertical lines on main software screen grid) can be
used to select a region of data (click and drag to select data). Selected readings are
between the two cursors. Click on a cursor line to select it (its color will turn bold). The
Cursor Location field (lower left) shows the cursor positions. As the arrow keys are used to
select the last record or the next record, the location numbers change to reflect the new
Left arrow key
Right arrow key
<Shift> left arrow
<Shift> right arrow
Moves to previous point on the current plot.
Moves to next point on the current plot.
Moves back 10 points on the current plot.
Moves ahead 10 points on the current plot.
Moves to first visible point on the current plot.
Moves to last visible point on the current plot.
Zoom and Pan on Graphs
To zoom in on a data point, <ctrl> left click on the desired point. The view resolution
increases until the mouse is released. To zoom out, right click the data point.
To pan, <ctrl-shift> click on the desired data point and drag to another point. The graph
view scrolls so that the original point now appears under the new mouse location. Drag the
mouse anywhere on the screen, even beyond the view port.
This switch is located just below the center of the graph on the main software screen.
When in the RECORD NUMBER position, the data will be plotted against each record
number 1 through n (n = total number of records). When in the TIME position, data is
plotted against the time of day that the readings were logged.
Previous Setting
Click on Previous Setting to download data from another datalogger without first closing
the program.
Company Logo
The company logo at the top right hand corner of the main software screen can be
customized. Please contact Extech for further information.
Message Board
The field on the bottom left hand corner of the main software screen is reserved for
program alerts, instructions, and messages. The software will instruct the user; please
observe this field during operation for helpful hints, instructions, and messages.
Download Commands
The Download area of the main software screen (bottom, center) is used to START and
STOP the transfer of the data from the Datalogger to the program. Press EXIT to return to
the normal operation mode.
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Battery Replacement
When the low battery icon (‘LO’) appears on the LCD display, replace the Lithium CR2
1. Open Datalogger housing by first removing the four (4) rear Phillips screws.
2. Carefully pry off the rear of the Datalogger.
3. The cylindrical lithium battery is located on the bottom of the PCB board.
4. Replace the battery, observing polarity.
5. Assemble the Datalogger housing.
EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects in parts and
workmanship for one year from date of shipment (a six month limited warranty applies on sensors and
cables). If it should become necessary to return the instrument for service during or beyond the warranty
period, contact the Customer Service Department at (781) 890-7440 ext. 210 for authorization or visit our
website at www.extech.com (click on ‘Contact Extech’ and go to ‘Service Department’ to request an RA
number). A Return Authorization (RA) number must be issued before any product is returned to Extech. The
sender is responsible for shipping charges, freight, insurance and proper packaging to prevent damage in
transit. This warranty does not apply to defects resulting from action of the user such as misuse, improper
wiring, operation outside of specification, improper maintenance or repair, or unauthorized modification.
Extech specifically disclaims any implied warranties or merchantability or fitness for a specific purpose and
will not be liable for any direct, indirect, incidental or consequential damages. Extech's total liability is limited
to repair or replacement of the product. The warranty set forth above is inclusive and no other warranty,
whether written or oral, is expressed or implied.
Calibration and Repair Services
Extech offers repair and calibration services for the products we sell. Extech also provides
NIST certification for most products. Call the Customer Service Department for information
on calibration services available for this product. Extech recommends that annual
calibrations be performed to verify meter performance and accuracy.
Support line (781) 890-7440
Technical support: Extension 200; E-mail: [email protected]
Repair & Returns: Extension 210; E-mail: [email protected]
Product specifications subject to change without notice
For the latest version of this User’s Guide, Software updates, and other
up-to-the-minute product information, visit our website: www.extech.com
Copyright © 2004 Extech Instruments Corporation
All rights reserved including the right of reproduction in whole or in part in any form.
Model 42270/75 42260/65 Version 3.1 December 2004