DMT340 Series Dew Point andTemperature Transmitters
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DMT340 Series Dew Point and Temperature Transmitters For Very Dry Conditions Features • 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 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) • Accurate and reliable measurement • Excellent long-term stability • Fast response time • Resistant to environmental factors and condensation Stability at Low Dew Points The Vaisala DRYCAP® sensor is immune to particulate contamination, water condensation, oil vapor, and most chemicals. The sensor is condensation resistant and recovers perfectly if exposed to liquid water. Fast reaction time and stability make its performance unmatched also in dynamic and low dew point applications. Graphical Display of Measurement Data and Trends for Convenient Operation The DMT340 features a large numerical and graphical display with a multilingual menu and keypad. It allows users to easily monitor operational data, measurement trends, and access measurement history for the past 12 months. Versatile Outputs and Data Collection The 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, with real-time clock and battery backup, guarantees reliable logging of measurement data for over 4 years. 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, which enables an Ethernet con

USB service cable makes it easy to connect the DMT340 to a PC via the service port for modifying settings or reading logged data. Easy Installation With multiple options to choose from, the instrument can be tailored to meet the specific needs of each individual application and is delivered installationready and pre-configured for each delivery. Quick delivery time and global service network make DMT340 a perfect choice for any project. The Vaisala DRYCAPâ Handheld Dew Point Meter DM70 is ideal for field checking DMT340 transmitters. Pressure range Mechanical durability Probe diameter...

DMT340 Series Dew Point and Temperature Transmitters for Very Dry Conditions DMT341 for Installations in Dry Spaces DMT342 with Small Size Flanged Probe DMT341 display shows measurement trends, real-time data, and measurement history. DMT341 is made for installations in dry rooms where the entire dew point transmitter needs to be inside the dry space. The concept is easy to clean and suitable also for cleanrooms. The DMT342 probe is installed using a flange or sampling cell. The small probe is ideal for integration into larger equipment or applications with high pressures.

The DMT344 features a threaded connection for extended pressures with different fitting-body options. It is ideal for permanent installation into pressurized or vacuum processes. The DMT347 probe is ideal for pressurized or vacuum applications in tight spaces. The small probe is installed using Swagelok® connectors. The DMT348 is ideal for installation into pressurized or vacuum processes where the probe needs to be able to be removed while the process is running. The probe depth is adjustable. Optional filter for low pressures, suitable for all models, dimensions in mm (inches). Optional...

stranded wires recommended RS-232, RS-485 (optional) ASCII commands, Modbus RTU RS-232, USB 0.5 A, 250 VAC, SPDT (optional) 10BASE-T, 100BASE-TX 8P8C (RJ45) DHCP (automatic), static Telnet, Modbus TCP/IP Measurement Performance Dew Point Sensor Vaisala DRYCAP® 180M Measurement range for continuous use -70 ... +45 °C (-94 ... +113 °F) Td Accuracy up to 20 bar/290 psia ±2 °C/±3.6 °F (see the accuracy graph below) Accuracy, 20 ... 50 bar/290 ... 725 psia Additional inaccuracy +1 °C Td Dew Point Accuracy vs. Measurement Conditions Response time 63% [90%] at +20 °C gas temperature T63 [T90]...

Mechanical Specifications Cable bushing M20x1.5 for cable diameter 8 ... 11 mm/ User cable connector (optional) M12 series 8-pin (male) Option 1 Female plug with 5 m (16.4 ft) black cable Option 2 Female plug with screw terminals USB-RJ45 Serial Connection Cable 219685 Probe cable diameter 5.5 mm (0.22 in) Standard probe cable lengths 2 m, 5 m, or 10 m (6.6 ft, 16 ft, or 33 ft) (Additional cable lengths available, see order forms for details) Housing material G-AlSi 10 Mg (DIN 1725) IP65 (NEMA4X) with local display Weight (depending on selected 1.0 ... 3.0 kg (2.2 ... 6.6 lb) probe, cable,...