Software Update: 49iQ and 146iQ Gas Analyzer products

Please fill out the form to download the latest software release 1.6.17.35771 for the Thermo Scientific™ 49iQ Gas Analyzer and the 146iQ Multi-Gas Calibrator. Once you submit the form, our technical support team will review your information. After the information is verified, a technical support representative will contact you via email with a link to the firmware update file within three (3) business days.

About the update:

This release includes several important enhancements and corrections. We encourage you to review the accompanying READ ME files prior to installing the update, as they provide detailed information on the changes included in this release and guidance for implementation.

Key updates include:

Support for the revised BIPM ozone cross-section value

The Bureau International des Poids et Mesures (BIPM) has updated the ozone cross-section value from 308 ± 4 atm−1 cm−1 to 304.39 ± 0.94 atm−1 cm−1, effective January 1, 2026. Environmental protection agencies—including the U.S. EPA—are expected to adopt this change on the same timeline. Although incorporating the revised value into analyzer firmware is optional, this update adds the new standard as a selectable option in the Settings > Configuration menu (“2026 BIPM O3 STD”). A reboot is required after enabling this option for it to take effect

Programmed Events functionality restored

An issue affecting the Programmed Events feature in the previous software release has been resolved and is now operating as intended

Bootloader update for improved cold-start stability

The bootloader has been updated to remove Ethernet support, preventing unexpected resets that could occur when the instrument starts up at cold temperatures

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