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USER MANUAL
Note: The 42270 readout may turn gray if the ambient temperature falls below
32°F (0°C). It may also darken and become unreadable if the ambient
temperature exceeds 122°F (50°C). This is expected operation. In both cases,
the unit will log readings normally and will continue to log throughout the
specified temperature measurement range.
Specifications
Front panel status LEDs (2): RECORD and ALARM
Temperature range -40 to 185°F (-40 to 85°C)
Model 42270 Temperature
& Humidity Datalogger
Temp. Resolution 0.1° up to 99.9°; 1° 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
RH range/accuracy 0.0 to 99.9% Relative Humidity; Accuracy: ± 3%
Datalogger Memory 16,000 readings
(8,000 temperature & 8,000 RH readings)
Sampling rate Programmable from 1 second to 12 hours
Introduction
Model 42270: Temperature and Humidity Datalogging Module
Model 42275: 42270 Module, Docking station, Software CD
This Datalogger can be used to monitor the temperature in
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.
Programming and data retrieval instructions are included on the
Power supply 3.6V ½ ‘AA’ lithium battery (SAFT LS-14250)
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)
Note: This datalogger cannot be used without the software and docking station
included in the 42275 kit. At least one 42275 kit is required per site.
Note: The datalogger display will not switch on until activated by software.
Software CD located in the 42275 kit or at www.Extech.com.
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
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.
Find Quality Products Online at: sales@GlobalTestSupply.com
www.GlobalTestSupply.com
Battery Replacement
When low battery icon (‘LO’) appears, replace the Lithium CR2 battery.
1. Open Datalogger 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 bottom of PCB board.
4. Replace the battery, observing polarity.
5. Assemble the Datalogger housing.
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