DMT348 Dewpoint and Temperature Transmitter for Desiccant Dryers, 2m cable - Vaisala Online Store

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DMT348 Dewpoint and Temperature Transmitter for Desiccant Dryers, 2m cable

The Vaisala DRYCAP® Dewpoint and Temperature Transmitter DMT348 is a stable and reliable transmitter especially suitable for desiccant dryer monitoring. The stability is due to a unique auto-calibration function. During auto-calibration the transmitter performs a calibration and adjustment automatically while the measured process is still running.

The Vaisala DRYCAP® sensor is immune to particulate contamination, water condensation, oil vapor and most chemicals. Its performance is unmatched for low dew point applications experiencing water spikes in the process. The sensor recovers rapidly from contact with freewater.

With the optional ball valve, the DMT348 is ideal for pressurized processes where the probe needs to be inserted or removed while the process is running. The probe depth is adjustable. The DMT348 is optimized for dew points down to -60°C (-76°F). For more humid (higher dewpoint) measurements, such as in typical refrigerant dryer systems, the Vaisala HUMICAP® Humidity and Temperature Transmitter HMT338 is recommended.

The transmitter has a keypad and a large graphical display for convenient monitoring of the reading and transmitter setting changes. For example both output signal type (voltage or current) and scaling can easily be changed by the user.

Analog outputs are preset at the factory. Users can easily change these settings.

  • Channel 1: 4…20 mA = -60...+20 °C Td
  • Channel 2: 4...20 mA = 0...+80°C T

The package includes:

  • Calibration certificate (ISO9001 compliant, traceable to NIST)
  • Pressure tight probe with 2 m (6.5 ft) cable
  • ISO1/2" (with leak screw) and NPT1/2" pressure fittings for probe installation into pipeline or pressure vessel
  • M20x1.5 cable gland and NPT1/2" conduit fitting included to facilitate wiring
  • User's Guide in English

DMT348 Dewpoint and Temperature Transmitter for Desiccant Dryers, 2m cable
DMT348 Dewpoint and Temperature Transmitter for Desiccant Dryers (ballvalve is optional)
Standard delivery time for single unit: 1 week
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Warranty: 24 months
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Detailed information

Measurement parameter(s)Dew point temperature
Absolute humidity*
Dew point converted to atmospheric pressure*
Mixing ratio*
ppm volume and weight concentration*
Relative humidity*
Temperature difference*
Water vapor pressure*
Measurement range-60 ... +80 °C (-76 ... +176 °F) Td
0 ... +80 °C (+32 ... +176 °F) T
Measurement accuracy±2 °C (± 3.6 °F) Td
±0.2 °C (±0.36 °F) T
Operating temperature-40 ... +80 °C (-40 ... +176 °F)
Operating pressure0 ... 40 bar (0 ... 580 psi)
Operating voltage10 ... 35 VDC, 24 VAC ±20%
Analog outputs4 ... 20 mA (default setting)
0 ... 20 mA
0 ... 1 V
0 ... 5 V
0 ... 10 V
Digital outputsRS-232
Housing classificationIP65 (NEMA 4X)
Links See full specifications on
Download user guides and other product documents on

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