Vaisala DMT340 Dewpoint and Temperature Transmitter

The DMT340 has a variety of features to choose from. Units are delivered installation-ready.

DMT340 is designed for industrial low humidity applications. Typical applications include compressed air drying and metal treatment. The device is very reliable, easy to use and economical to maintain. The Vaisala DRYCAP® Sensor is immune to particulate contamination, water condensation, oil vapour and most chemicals. Since the sensor withstands condensation, its performance is unmatched for low dewpoint applications that experience water spikes in the process. The sensor recovers rapidly from contact with free water.

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Patented auto-calibration
The stability of the DMT340 is due to the unique auto-calibration function, patented by Vaisala. The auto calibration makes the transmitter perform a calibration and adjustment by itself while the measured process is running. If the measurement accuracy is not confirmed, corrections are made automatically. The procedure is so quick and corrections are so minor that it will go unnoticed. This ensures low maintenance and high performance.

Calibration intervals depend on the application; in normal conditions, a NIST traceable calibration in every two years is recommended.

Graphical measurement trend and history display
The DMT340 can be ordered with a large numerical and graphical display with a multilingual menu. It allows the user to monitor measurement trends and one-year history. The optional data logger with real-time clock makes it possible to generate more than four years of measured history and zoom in on any desired time or time frame. The display alarm allows tracking of any measured parameter, with a freely configurable low and high limit.

Versatile outputs and (wireless) data collection
The DMT340 can be connected to a network with an optional (W)LAN interface, which enables a (wireless) Ethernet connection. For serial interface also the USB connection, RS232 and RS485 can be used. Additionally an alarm relay option is available.

The transmitter can have up to three analogue outputs. Galvanic isolation of supply power and analogue outputs are also offered. The recorded measurement data can be viewed on the display or transferred to a PC with Microsoft Windows® software.

Easy installation
The DMT340 has a variety of features to choose from. Units are delivered installation-ready.


• Measures dewpoints from -60 °C to +80 °C with the accuracy of ±2 °C

• Vaisala DRYCAP® Sensor provides accurate, reliable measurement with excellent long-term stability and fast response

• Withstands condensation

• Unique auto-calibration feature

• Optional alarm relays, local display and mains power supply module

• Compatible with Vaisala DRYCAP® Hand-Held Dewpoint Meter DM70

• NIST traceable (certificate included)

• 3 analog outputs and a serial interface, WLAN/LAN

Please read specification sheet and order guide prior to placing an order. Vaisala products are professional grade instruments and have options specific to your application. This information needs to be detailed.





Weight 5 kg
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