Vaisala DPT146 Dew Point and Pressure Transmitter – Discontinued

Vaisala DPT146 Dew Point and Pressure Transmitter

The Vaisala DPT146 combines dew-point and process-pressure measurement in one compact transmitter for compressed-air systems. This model is discontinued and should not be selected for new projects.

  • Dew-point measurement from −70 to +30 °C Td
  • Absolute-pressure measurement from 1 to 12 bar
  • Pressure-compensated dew point and ppm calculation
  • Analog outputs and RS-485 with Modbus RTU
  • Contact Seacom for existing-unit support and replacement assessment

Product status: The Vaisala DPT146 has been discontinued and is not recommended for new projects. There is no universal one-for-one replacement because the DPT146 measures both dew point and pressure. The correct migration path depends on whether pressure measurement must be retained.

Vaisala DPT146 for Compressed-Air Monitoring

The Vaisala DPT146 was designed for monitoring compressed air where dew point changes with process pressure. By measuring both parameters at the same location, it can provide pressure-compensated humidity information without relying on a manually entered pressure value.

Typical applications include desiccant dryers, compressed-air networks, plastics drying, additive manufacturing and other industrial systems where low moisture levels must be monitored reliably.

Measured and Calculated Parameters

ParameterTypeRange
Dew point Measured −70 to +30 °C Td
Absolute pressure Measured 1 to 12 bar
Temperature Measured through RS-485 −40 to +80 °C
Moisture concentration Calculated 1 to 40,000 ppm
Atmospheric-pressure dew point Calculated −75 to +30 °C

Key Specifications

SpecificationDPT146
Dew-point accuracy Up to ±2 °C Td
Pressure accuracy ±0.4% of full scale at +23 °C
Temperature accuracy ±0.5 °C from 0 to +40 °C; ±1 °C across −40 to +80 °C
Analog outputs Two configurable channels: 0–20 mA, 4–20 mA, 0–5 V or 0–10 V
Digital communication RS-485 with Vaisala protocol or Modbus RTU
Process connections ISO G1/2, NPT 1/2 or UNF 3/4-16
Wetted construction AISI 316L stainless steel
Recommended calibration interval Two years

Replacement Planning for DPT146

The former DPT146 product page now points to the DMT143 family, but the DMT143 does not include process-pressure measurement. It may suit a compact dew-point-only application, but it is not a direct functional replacement.

SelectionDPT146 legacy installationDMT143 or DMT143LDMP8
Primary measurement Dew point and absolute pressure Compact dew-point measurement Dew point and temperature
Pressure measurement Integrated Not included Not included
Typical fit Existing combined measurement point Compact OEM equipment and small dryers Pressurised pipelines and industrial compressed air
Installation Direct process or sampling-cell installation Compact direct or sampling installation Adjustable insertion; optional ball-valve installation
Integration Analog outputs and Modbus RTU Analog output and RS-485 Standalone Modbus RTU or Vaisala Indigo transmitter

Explore the Vaisala DMP8 dew-point probe

If pressure is still required: plan for a suitable dew-point instrument together with a separate pressure transmitter, then confirm how both signals and any pressure compensation will be handled by the control or monitoring system.

Before Replacing an Existing DPT146

Record the full DPT146 order code, process connection, operating pressure, dew-point range, output scaling, Modbus settings, supply voltage, sampling arrangement and receiving-system configuration. These details are needed to determine whether the application can use a dew-point-only instrument or requires a two-instrument solution.

For an operating unit, retain the existing manuals, wiring records and calibration history. Remaining stock, calibration and service options should be checked for the individual serial number and installation.

Vaisala DPT146 Support and Replacement Assessment in Malaysia

Seacom Process Instruments supports existing Vaisala DPT146 installations in Malaysia and can assist with product-status checks, calibration planning, process-connection review, output matching and migration to a current dew-point measurement solution.

Contact Seacom with your compressed-air pressure, dew-point range, dryer type, process connection, required outputs and whether independent pressure measurement is needed. Our team can help assess a DMT143, DMP8 or separate dew-point-and-pressure arrangement for the application.

Download

  DPT146 Catalogue   (353.03k)

  DPT146 Order Form   (395.25k)


Specific References

12 other products in the same category:

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Vaisala HUMICAP® Dewpoint Transmitter DMT132 is an affordable dew point measurement instrument designed to verify the functionality of refrigerant dryers. The probe has excellent long-term stability and it is resistant to compressor oil. It is especially well suited for OEM dryer manufacturers.

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The Vaisala DPT145 provides online dew-point, pressure and temperature measurement for SF6-insulated electrical equipment. The model is being discontinued and should not be specified for new projects.

  • Measures dew point, pressure and temperature
  • Calculates SF6 density, normalised pressure and moisture in ppm
  • RS-485 communication with Modbus RTU
  • Contact Seacom for availability and replacement assessment
Dew Point Transmitter for Very Dry Environment DMT152
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The Vaisala DRYCAP® Dewpoint Transmitter DMT152 is designed for measuring low dew point in OEM applications, even down to -80°C. The excellent long-term stability and reliability of its performance is based on the latest DRYCAP® polymer sensor technology. The DMT152 is an ideal choice for industrial applications where it is necessary to control very low humidity. 

DMT152 is an ideal choice for the semiconductor industry, air and plastics dryers, glove boxes, dry chambers, pure gases, additive manufacturing, high voltage circuit breakers and other applications where it is critical to control humidity with high accuracy. DMT152 measures accurately and reliably also in the challenging combination of low humidity and hot air, which is typical in plastics drying.

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  • Dew point measurement range from −70 to +80 °C Td/f
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  • Modbus RTU communication or integration with Vaisala Indigo transmitters
  • Connect to Indigo80 for portable display, data logging, diagnostics and field calibration
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Vaisala DMP5 Dew Point Probe for Processes up to 180 °C
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Vaisala DMP5 Dew Point Probe for Processes up to 180 °C

The Vaisala DRYCAP® Dew Point and Temperature Probe DMP5 measures humidity directly in hot industrial processes with a long stainless-steel probe and adjustable installation depth.

  • Direct in-line measurement at process temperatures up to +180 °C
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  • Long probe reaches through insulation and thick process walls
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  • Connect to Indigo80 for portable display, diagnostics, configuration and field calibration
Dew Point Transmitter for High Temperature Applications DMT345 DMT346
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The Vaisala DRYCAP® Dewpoint Transmitters DMT345 and DMT346 are designed for humidity measurement in industrial drying applications with particularly high temperatures. The high temperature tolerance of the sensor allows direct measurement from hot process without the need for a sampling system and sample conditioning. The wide dynamic rage of the measurement in DMT345 and DMT346 is unique: Measurements can be made from -40 °C frost point up to +100 °C dew point, with dry-bulb temperatures ranging up to 350 °C.

Vaisala Indigo510 Indigo520 Malaysia
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Vaisala Indigo510 and Indigo520 Flagship Transmitters

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The Vaisala Indigo500 Series provides flagship industrial measurement integration: choose Indigo510 for a simplified single-probe system or Indigo520 for full dual-probe capability.

  • Indigo510: one probe and two isolated analog outputs
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  • Dew point measurement range from −70 to +80 °C Td/f
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Miniature Dew Point Transmitter DMT143 DMT143L
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Vaisala DMP6 Dew Point Probe for Processes up to 350 °C
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