User's Guide
Model 42270 Temperature & Humidity Datalogger
Model 42260 Temperature Datalogger
Introduction
Congratulations on your purchase of the Extech Datalogging Module. The following
models are covered in this manual.
Model 42270: Temperature and Humidity Datalogging Module
Model 42260: Temperature-only Datalogging Module
The Dataloggers 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. Instructions on how to program the
dataloggers are not included this manual. Programming and data retrieval
instructions are included in the 42275, 42265, 42276 and 42266 kits.
Description
1. Mounting hole
2. Status LEDs (Record and Alarm)
3. LCD display
Displays
LCD Display
REC: Displayed while logging readings.
HI and LOW: Displayed when the High or Low Alarm limit is exceeded.
RH%: Relative Humidity (42270 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.
Specifications
Front panel status LEDsTwo (2): RECORD and ALARM
Temperature range -40 to 185°F (-40 to 85°C)
Temperature resolution 0.1° up to 99.9°; 1o from 100° to 185°
Temperature accuracy ±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 Memory 16,000 temperature readings (8,000 temperature and
Sampling rate Programmable from 1 to 7200 seconds (2 hours)
Power supply One 3.6V ½ ‘AA’ lithium battery
Battery Life 1 year: 5 second sample rate in sleep mode
3.8 months: 24 hour sample rate in non-sleep mode
Low battery Indicator Display shows ‘LO’
Dimensions 3 x 2.3 x 0.88" (76.2 x 57.2 x 22.3mm)
8,000 humidity readings on the 42270)
The datalogger display will not switch on
until activated by software or the printer
programmer.
THESE DATALOGGERS CANNOT BE USED WITHOUT THE
SOFTWARE FROM KIT 42275 (42265) OR THE PRINTER
Battery Replacement
When the low battery icon (‘LO’) appears on the LCD display, replace the Lithium CR2
battery.
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.
Warranty
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 to 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 www.extech.com
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 liab ility 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.
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
Extech Instruments Corporation, 285 Bear Hill Rd., Waltham, MA 02451
All rights reserved including the right of reproduction in whole or in part in any form.
PROGRAMMER 42276 (42266).
for contact information. A Return Authorization (RA)
Support line (781) 890-7440
Technical support: Extension 200; E-mail: support@extech.com
Repair & Returns: Extension 210; E-mail: repair@extech.com
Copyright © 2008 Extech Instruments Corporation
42270/42260 Rev 2.1 03/08
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