Catalogue Dewpoint and Temperature Transmitters for Low Dewpoint Applications
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<♦> VAISALA
P.O. Box 26, FI-00421 Helsinki, Finland Tel. +358 9 894 91 Fax: +358 9 8949 2485 Email: industrialsales@vaisala.com www.vaisala.com/DMT340
DMT340 Series Dewpoint and Manufacturer of temperature transmitters for Low Dewpoint Applications
Features/Benefits
• Measures dewpoints from -60 °C to +80 °C (-76 ... +176 °F) with the accuracy of ±2 °C (±3.6 °F)
• 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 supplier module
• Compatible with Vaisala DRYCAP" Hand-Held Dewpoint Meter DM70
• NIST traceable (certificate included)
• 3 analog outputs and a serial interface
history and zoom in on any desired time or time frame. he battery backup of the real-time clock guarantees a reliable logging of measured data.
Versatile outputs
he DMT340 can have up to three analog outputs. Galvanic isolation of supply power and analog outputs is also available. For serial interface the USB connection, RS232 and RS485 can be used. Additionally alarm relay option is available.
Easy installation
he DMT340 has a variety of features to choose from. Units are delivered installation-ready.
The DMT340 transmitter family has the solution for demanding industrial dewpoint measurements.
he Vaisala DRYCAP" Dewpoint and Temperature Transmitter Series DMT340 is designed for industrial low humidity applications. Typical applications include compressed air drying and metal treatment. he device is very reliable, easy to use and economical to maintain.
Stability in low dewpoints
he Vaisala DRYCAP" Sensor is immune to particulate contamination, water condensation, oil vapor and most chemicals. Since the sensor withstands condensation, its performance is unmatched for low dewpoint applications that experience water spikes in the process. he sensor recovers rapidly from contact with free water.
Patented auto-calibration
he stability of the DMT340 is due to the unique auto-calibration function, patented by Vaisala. he 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. he procedure is so quick and corrections are so minor that
The display shows measurement trends, real time data and history.
it will go unnoticed. his ensures low maintenance and high performance. To continue performance at the highest level, the transmitter can be sent to Vaisala for a NIST traceable calibration. 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
he 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. he optional data logger with real-time clock makes it possible to generate more than four years of measured
The Vaisala DRYCAP® HandHeld Dewpoint Meter DM70 is ideal for field checking DMT340 professional transmitters.
Vaisala Instruments Catalog 2008
Ref. B210712en rev. A
52
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