Onset InTemp temperature data logger CX500 series .jpg
Onset InTemp temperature data logger CX500
Onset InTemp temperature data logger CX500

Part Number - CX503

InTemp Bluetooth 365 Day Multiple-Use Temperature Data Logger

$100.00 USD

Important Information

For automatic downloads and remote alerts, InTemp loggers require the optional InTemp CX Gateway. MORE INFORMATION


The InTemp CX503 Bluetooth data logger is a multiple-use logger that records temperature data for up to a year. Designed for Cold Chain, CRT, and Frozen shipments, the CX503 is ideal for closed-loop monitoring applications, as well as qualification testing and equipment validation.

Using the InTemp app on your mobile device, you can easily configure the CX503 with one of multiple preset configurations, or set up a custom configuration. The logger has a built-in alarm to alert you of excursions. Logger reports can be quickly downloaded to your phone or tablet and uploaded to an InTempConnect® account, where you can analyze and export data as needed.

With the optional CX Gateway, you can get remote notifications of temperature excursions and automatically download data from loggers within range of the device. Learn more about the InTemp CX Gateway

A 3-Point Certificate of Calibration, valid for one year from date of purchase, provides assurance that the data can be trusted when making important product-disposition decisions.

Learn more about our compatible mobile and cloud solutions:


InTempConnect A cloud-based data command-center control for monitoring all loggers throughout your global supply chain

InTemp App A free mobile app that streamlines logger configuration and readout, and automatically uploads reports to InTempConnect

InTempVerify A free mobile app that manages user permissions and the activation of data downloads by anyone—anywhere, anytime


  • Integrates with mobile and cloud platforms for a 21 CFR Part 11 compliant solution
  • Enables fast, remote data transfer; ideal for clinical logistics
  • Eliminates need to open sealed containers to retrieve data
  • Real-time alerts and automatic data downloads with optional InTemp CX Gateway device
  • Shortens logger-handling times; no PC or cables required
  • Ensures secure data via encrypted technology
  • Meets GDP requirements for NIST traceable calibration


Temperature Sensor

-30° to 70°C
-22° to 158°F
±1.0°C from -30° to -5°C
±1.8°F from -22° to 23°F
±0.5°C from -5° to 50°C
±0.9°F from 23° to 122°F
±1.0°C from 50° to 70°C
±1.8°F from 122° to 158°F


Logger Operating Range
-30° to 70°C
-22° to 158°F
NIST Calibration
Three-point NIST calibration, probe only @ -10C, 25C, and 55C
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)
Multiple Use
Up to 1 year
Shelf Life
Up to 1 year
Logging Rate
1 second to 18 hours
CR2450 3V lithium, not replaceable. Battery life is 1 year, typical with logging interval of 1 minute. Faster logging intervals, remaining connected with the InTemp app, excessive downloads, and paging may impact battery life.
14,000 measurements
Full Memory Download Time
Approximately 30 seconds; may take longer the farther the device is from the logger
6.9 x 4.5 x 1.1 cm
2.71 x 1.76 x 0.42 inches
25.5 g
0.90 oz
Environmental Rating
CE Compliance Mark
FCC Compliance Mark
Australia New Zealand Compliance Mark
Japanese Telecom Compliance Mark



Passed RTCA DO160G, part 21H



InTemp CX500 Series Temperature Logger (CX501, CX502, CX503) Manual

InTemp CX500 series loggers measure temperature in transportation monitoring applications.

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Quick Start for the InTemp CX500 Series Loggers (CX501, CX502, CX503)

A quick start guide on how to set-up, configure, start, and deploy your CX500 series logger.

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InTemp System User’s Guide

CX series loggers, the InTemp® app, and InTempConnect™ web-based software work together to form the InTemp temperature monitoring solution.

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