Vaisala Drycap DMT152, Руководство пользователя

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2. Product Overview
2.1 Introduction to DMT152
The Vaisala DRYCAP
â
dew point transmitter DMT152 measures dew point temperature
accurately in a measurement range from −80 °C to −20 °C (−112 … −4 °F). The maximum
output range of the transmitter is −100 … 20 °C (−148 … +68 °F).
DMT152 is designed for a wide range of OEM applications. The transmitter is easy to install, and
the mechanics have been designed for harsh environments requiring protection against dust,
dirt, and splashed water.
The excellent stability and reliability of the transmitter’s performance is based on advanced
DRYCAP polymer sensor technology. The DRYCAP technology has low maintenance needs due
to its excellent long-term stability and durability against condensation. For more information
on DRYCAP technology, see
Advanced DRYCAP Technology (page 12) .
DMT152 Measurement Parameters
Table 3 DMT152 Measurement Parameters
Parameter Abbreviation Metric Unit Non-Metric Unit
Dew point / frost point
temperature TDF °C °F
Parts per million H2O ppm
v
/ppm
w
ppm
v
/ppm
w
2.1.1 Basic Features and Options
• Calibrated dew point measurement range −80 … −20 °C T
d
, output range
−100 … +20 °C T
d
• Output in T
d
1)
and ppm
• DRYCAP polymer sensor with auto-calibration and sensor purge ensures long-term
stability
• Small size to fit in tight installations
• Two analog output channels, selectable from 0 … 20 mA / 4 … 20 mA and 0 … 5 V /
0 … 10 V
• Configurable alarm modes for analog outputs
• Digital output: RS-485
• Serial line connection also via USB serial interface cable
• Simultaneous use of analog and digital output possible
• Field check suitability with DM70 handheld meter
• Sampling cells with different installation options available as optional accessories
1) When the dew point is below 0 °C, the transmitter outputs frost point for T
d
Chapter 2 – Product Overview
9