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InTemp CX Temperature Logger (CX40x) Manual 

1-800-LOGGERS 2 

www.onsetcomp.com 

Specifications (continued) 

LCD 

LCD is visible from 0° to 50°C (32° to 122°F); the LCD may react slowly or 
go blank in temperatures outside this range 

Dimensions 

9.4 x 4.5 x 2.59 cm (3.7 x 1.77 x 1.02 inches) 

Weight 

90.2 g (3.18 oz) 

Environmental Rating 

IP54 

 

The CE Marking identifies this product as complying with all relevant 
directives in the European Union (EU). 

 

 

See last page 

 

Logger Components and Operation 

 

Start Button:

 Press this button for 1 second to start the logger 

when it is configured to start “on button push” (see 

Configuring 

the Logger

). 

Mute or Next Button: 

Press this button for 1 second to mute a 

beeping alarm (see 

Logger Alarms

). For CX402 loggers, press 

this button for 1 second to switch between the external probe 
and ambient internal sensor temperature readings. 

 

Magnets:

 There are four magnets on the back of the logger (not 

shown in diagram) for mounting. 

Temperature Sensor: 

This internal sensor measures ambient 

temperature.

 

External Temperature Probe:

 This is the probe that is plugged 

into the logger for measuring temperature (CX402 models 
only). 

Audible Alarm Speaker:

 This is the speaker for the audible 

alarm that beeps when an alarm is tripped or the external 
probe is removed (if applicable). 

Alarm LED:

 This LED blinks every 5 seconds when an alarm is 

tripped or the external probe is removed (if applicable). See 

Logger Alarms

LCD

: This screen shows the latest temperature reading and 

other status information. The LCD screen refreshes at the same 
rate as the logging interval. The example shows all symbols 
illuminated on the LCD screen followed by a table with 
descriptions of each symbol.  

 

LCD Symbol 

Description 

An alarm has tripped because the temperature 
reading is outside the specified range 

 

The logger has been configured to perform daily or 
twice daily checks (twice daily is shown in this 
example), but no checks have been performed yet.  

 

The once daily or twice daily logger check (twice in 
this example) has been performed. 

 

This indicates how much memory has been used 
for the current deployment. In this example, 
approximately 40 percent of the memory has been 
used. 

 

The shows the approximate battery power 
remaining. 

The logger is currently logging. 

 

The logger is currently connected to a phone or 
tablet via BlueTooth. The more bars there are, the 
stronger the signal. 

 

The logger is waiting to be started. Press and hold 
the Start button for 3 seconds to start the logger. 

This is an example of a temperature reading from 
an external probe. 

This is an example of a temperature reading from 
the internal sensor. 

 

This is an example of a minimum temperature, 
which is the lowest probe temperature reading 
from the day (CX402 models) or the lowest 
ambient temperature reading (CX403 model). 

 

This is an example of a maximum temperature, 
which is the highest probe temperature reading 
from the day (CX402 models) or the lowest 
ambient temperature reading (CX403 model). 

 

and 

 

The external probe is not connected to the logger 
(if applicable). 

External 
temperature 
probe (CX402 
models only) 

LCD 

Alarm LED 

Start button 

Audible alarm 
speaker 

One of four 
magnets (on 
back of logger) 

Temperature 
sensor (behind 
rectangular 
plug) 

Mute or Next 
button 

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