CARB certified Vapor Recovery  

The Veeder-Root In-Station Diagnostics (ISD) solution is a comprehensive product designed to monitor gasoline dispensing facilities according the standards defined by the California Air Resources Board (CARB) Phase II Enhanced Vapor Recovery (EVR) Executive Orders (EO).   

The most accurate vapor-recovery detection

The Veeder-Root CARB-certified ISD system provides the most accurate vapor-recovery detection available in the industry and is the choice of over 90% of the sites that need to meet the California Enhanced Vapor Recovery regulations. The vapor flow meter measures the amount of gasoline vapor returning from the car while the pressure sensor monitors your tank 24 hours a day to ensure proper functioning of your vapor-recovery system. It also monitors the vapor space integrity of the underground storage tanks as well as the vapor piping.

Key Features

  • CARB-certified with the most hanging hardware options, providing California customers additional flexibility

  • Leverages existing investment in TLS-350 equipment, minimizing initial equipment, permitting, and installation cost

  • Maximizes site uptime using Single Dispenser Shutdown functionality

  • Status and alarm notification are provided through the front panel display and printer for regulatory reporting.


The latest system requirements for Veeder-Root's In-Station Diagnostic (ISD) are available on the California Air Resource Board website. Please select the appropriate CARB Executive Order for additional information.

CARB Executive Order


VR-202 Vacuum Assist

VR-204 Balance

The site owner and installing contractor are responsible for understanding and abiding by local permit conditions. Consult your local jurisdiction for software requirements prior to any ISD installation. Failure to do so may result in violations, fines, and other associated costs.


Product Form

Product Number




ISD Software Enhancement Module

For use with the TLS-350


ISD Assist Flow Meter Kit

For use with the TLS-350


ISD Balance Flow Meter Kit

For use with the TLS-350


ISD Vapor Pressure Sensor

For use with the TLS-350


Smart Sensor Module

For use with the TLS-350