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InTemp® CX405 RTD Dry Ice Logger Manual 

25469-A 

The InTemp CX405 RTD dry ice logger is designed for Cold Chain monitoring and has a built-in 
external probe that can measure temperatures as low as -95°C (-139°F). This Bluetooth® Low 
Energy-enabled logger is designed for wireless communication with a mobile device. Using the 
InTemp app, you can easily configure the logger, perform daily logger checks, download 
reports, and monitor tripped alarms. Or, you can use InTempConnect® to configure and 
download CX series loggers via the CX5000 Gateway. Use the LCD screen on the logger to check 
the current temperature, logging status, battery usage, and more. Once data is uploaded to 
InTempConnect, you can track logger configurations and automatically upload logger data to 
build custom reports for further analysis. 

Specifications 

External Temperature Probe

 

Range 

-95° to 50°C (-139° to 122°F) 

Accuracy 

±1.5°C from -95° to -40°C (±2.7°F from -139° to -40°F) 
±1.0°C from -40° to -10°C (±1.8°F from -40° to 14°F) 
±0.5°C from -10° to 50°C (±0.9°F from -14° to 122°F) 

Resolution 

0.05°C at 25°C (0.09°F at 77°F) 

Drift 

<0.1°C (0.18°F) per year 

NIST Calibration 

Two-point NIST calibration, probe only 

Cable Length 

1.5 m (4.92 ft) 

Probe Dimensions 

Food-grade stainless steel probe with blunt tip, 31.75 mm (1.25 inches) 
long, 4.78 mm (0.188 inches) diameter 

Ambient Temperature Sensor

 

Range 

-30° to 70°C (-22° to 158°F) 

Accuracy 

±0.5°C from -15° to 70°C (±0.9°F from 5° to 158°F) 
±1.0°C from -30° to -15°C (±1.8°F from -22° to 5°F) 

Resolution 

0.024°C at 25°C (0.04°F at 77°F) 

Drift 

<0.1°C (0.18°F) per year 

Logger 

 

Radio Power 

1 mW (0 dBm) 

Transmission Range 

Approximately 30.5 m (100 ft) line-of-sight 

Wireless Data Standard 

Bluetooth Low Energy (Bluetooth Smart) 

Logger Operating Range 

-30° to 70°C (-22° to 158°F), 0 to 95% RH (non-condensing) 

Logging Rate 

1 second to 18 hours 

Time Accuracy 

±1 minute per month at 25°C (77°F) 

Battery Type 

Two AAA 1.5 V alkaline or lithium batteries, user replaceable 

Battery Life 

1 year, typical with logging interval of 1 minute. Faster logging intervals, 
remaining connected with the app, excessive report generation, 
numerous audible alarms, and paging all impact battery life. 

Memory 

128 KB (75,245 total measurements or 37,622 probe & internal paired 
measurements) 

Full Memory Download 
Time 

Approximately 60 seconds; may take longer the farther the device is 
from the logger 

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 

Passed RTCA DO160G, part 21H 

InTemp CX405 RTD Dry Ice 
Logger 

Included Items: 

 

Two AAA 1.5 V alkaline 
batteries 

 

Battery door and screw 

 

NIST Certificate of Calibration 

Required Items: 

 

InTemp app 

 

Device with iOS or Android™ 
and Bluetooth 

 

 

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