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Vapor-logic microprocessor controller

The Vapor-logic controller provides comprehensive control for DriSteem GTS, STS, Vaporstream, Vapormist, Humidi-tech, CRUV, and XT Series humidifiers.



  • Interoperability allows communication with building automation systems via Modbus or with optional BACnet or LonTalk protocols.

  • Web interface provides the capability to set up, view, and adjust humidifier functions

    via Ethernet, either directly or remotely through a network.

  • USB port allows easy firmware updates, and data backup and restore capability.

  • PID control allows tuning of the system for maximum performance.

  • Real-time clock allows time-stamped alarm and message tracking, and accurate drain and flush scheduling.

  • Programmable outputs allow remote signaling and device activation.

  • Enhanced diagnostics include a test outputs  function to verify component operation, and a test humidifier function to simulate humidifier demand to validate performance.

  • Auxiliary temperature sensor/transmitter allows air temperature monitoring, such as in a duct, and enables temperature compensation to prevent window condensation.


Vapor-logic upgrades!

DriSteem's Vapor-logic controller is available as an upgrade kit, allowing older DriSteem humidifiers to gain all the benefits of our newest controller. The kit includes everything needed to make the upgrade, including a specially designed Vapor-logic adaptor board that mounts permanently and provides simplified wiring connections.


The upgrade kit is available for the following humidifiers operating with Vapor-logic:

GTS, STS, Vaporstream, Vapormist, Humidi-tech, CRUV