Vaisala DMT340 Series Dew Point and Temperature Meter

Vaisala DRYCAP® Dew Point and Temperature Transmitter Series DMT340 are designed for industrial low-humidity applications such as industrial drying, compressed air systems, semiconductor industry, dry rooms, baking ovens, and metal heat treatment.

The Vaisala DMT340 can support up to three isolated analog outputs. Optional AC mains power and relay outputs are also available. In addition to the analog outputs, the DMT340 supports Modbus RTU and TCP/IP communication protocol.

The data logger guarantees reliable logging of measurement data for over 4 years with real-time clock and battery backup. The display alarm allows tracking of any measured parameter, with freely configurable low and high limits. The recorded data can be viewed on the local display or transferred to a PC with Microsoft Windows® software. The transmitter can also be connected to a network with an optional LAN interface, enabling an Ethernet connection. A USB service cable makes it easy to connect the DMT340 to a PC via the service port for modifying settings or reading logged data. 

  • Measures dew point from -70 … +80 °C (-94 … +176 °F) with an accuracy of ±2 °C (±3.6 °F)
  • Condensation-resistant
  • Unique auto-calibration feature maintains accuracy over the long term
  • Compatible with Vaisala DRYCAP® Handheld Dew Point Meter DM70
  • Traceable calibration to measurements and analog outputs (certificates included)
  • Graphical display and keypad for convenient operation
  • Optional alarm relays and mains power supply module
  • Up to three analog outputs, RS-232/485, LAN
  • Modbus protocol support (RTU/ TCP)
Pressure Range0 … 50 bar/0 … 725 psia0 … 50 bar/0 … 725 psia0 … 10 bar/0 … 145 psia0 … 40 bar/0 … 580 psia
Mechanical durabilityUp to 250 bar/
3625 psia
Up to 100 bar/1450 psiaUp to 10 bar/145 psiaUp to 70 bar/1015 psia
Probe diameter12 mm/0.5 in12 mm/0.5 in12 mm/0.5 in12 mm/0.5 in
InstallationFlange 36 mm/1.4 inFitting body M22 x 1.5
Fitting body NPT 1/2 in
Fitting body R 3/8 in
Fitting body G 1/2 in ISO
Fitting body NPT 1/2 in
Fitting body R1/2 in ISO
Fitting body NPT 1/2 in
Ball-valve set   


Sampling cellHMP302SC  

DMT242SC or

Datasheet: Vaisala-DMT340-Series-Datasheet-B210952EN
Instruction Manual: Vaisala DMT340 User’s Guide in English M210704EN
Order Form: Vaisala DMT340 Order Form Global

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