Vaisala DPT145 SF6 Multiparameter Transmitter – Discontinued

Vaisala DPT145 Multiparameter Transmitter for SF6 Gas

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

Product transition: Vaisala is discontinuing the DPT145 and advises that it must not be specified for new projects. No universal direct replacement has been announced because the correct solution depends on the SF6 equipment, required parameters, mechanical connection and monitoring architecture. Existing users should contact Seacom for availability, service support and an application-specific replacement assessment.

Vaisala DPT145 Multiparameter Transmitter for SF6 Gas

The Vaisala DPT145 is a compact multiparameter transmitter developed for online condition monitoring of SF6 gas used in high-voltage switchgear, circuit breakers and other gas-insulated electrical equipment.

One instrument measures dew point, absolute pressure and temperature. From these measurements, it calculates SF6 or SF6/N2 mixture density, pressure normalised to +20 °C, moisture concentration in ppm and dew point converted to atmospheric pressure.

Seven SF6 Parameters from One Transmitter

ParameterTypeMeasurement or calculation range
Dew point Measured −60 to +30 °C Td
Absolute pressure Measured 1–12 bar
Temperature Measured −40 to +80 °C
Normalised pressure Calculated 1–12 bar, normalised to +20 °C
SF6 or SF6/N2 density Calculated 0–100 kg/m³
Moisture by volume Calculated 40–40,000 ppm
Atmospheric-pressure dew point Calculated −65 to +30 °C

Online Monitoring of SF6 Insulation Condition

Moisture and gas pressure are important indicators of SF6 insulation condition. Online dew-point measurement identifies increasing moisture, while direct and normalised pressure measurements help reveal gradual or sudden leakage.

Combining seven parameters in one transmitter reduces the number of mechanical connections, cables and separate instruments required by an OEM or condition-monitoring system. Continuous trend data also reduces the need for manual sampling and helps avoid unnecessary SF6 release during routine checks.

Measurement Performance

SpecificationDPT145 performance
Dew-point accuracy ±3 °C Td within the specified measurement area
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
Density accuracy for pure SF6 ±1% FS from 0 to +40 °C; ±2.2% FS from −40 to +60 °C
Digital output RS-485 with Vaisala protocol or Modbus RTU
Operating pressure 1–12 bar
Mechanical durability 0–50 bar
Enclosure AISI 316L stainless steel, IP66

Mechanical Connection Options

  • DILO DN20 connector
  • DILO DN8 connector
  • ABB Malmquist-compatible connector
  • Alstom G1/2-inch-compatible connector

Each mechanical connection is helium leak-tested at the factory. A compatible weather shield is required for continuous outdoor installation.

Important Replacement Guidance

The DPT145 combines SF6-specific calculations with dew-point, pressure and temperature measurement. A standard compressed-air dew-point transmitter is therefore not automatically a direct replacement.

Do not substitute DPT146 without an engineering review: DPT146 is intended for compressed air and does not reproduce the complete SF6-specific density and normalised-pressure functions of DPT145.

For a replacement assessment, confirm the measured gas, pressure range, required parameters, mechanical connector, electrical supply, Modbus integration, installation environment, existing controller calculations and whether a single-device or multi-instrument solution is acceptable.

Existing DPT145 Installations

For an installed DPT145, retain the full model code, mechanical-connector details, communication settings, calibration records and controller register mapping. This information is important when checking remaining product availability, arranging service or developing a replacement plan.

Continue operating and maintaining existing instruments according to the Vaisala documentation and the safety procedures applicable to SF6-insulated electrical equipment.

Vaisala DPT145 Support in Malaysia

Seacom Process Instruments supports existing Vaisala DPT145 SF6 multiparameter transmitter installations in Malaysia and can assist with product-status checks, remaining availability, connector identification, Modbus integration, calibration planning and replacement assessment.

Contact Seacom with the DPT145 model code, equipment manufacturer, SF6 pressure range, mechanical connection, required measurement parameters and control-system details so we can review the most suitable path forward.

Download

  DPT145 Catalogue   (280.54k)

  DPT145 Order Form   (113.98k)


Specific References

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  • Dew point measurement range from −70 to +80 °C Td/f
  • Fast response for detecting changes across large dry rooms
  • 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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  • Built-in Modbus RTU or integration with Vaisala Indigo transmitters
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Vaisala DMT132 Dew Point Transmitter for Refrigerant Dryers

Vaisala DMT132 Dew Point Transmitter for Refrigerant Dryers

The Vaisala DMT132 is a compact and economical dew-point transmitter designed to verify refrigerant-dryer performance by measuring the actual outlet-air dew point.

  • Dew-point measurement range from −30 to +50 °C Td/f
  • Accuracy up to ±1 °C in the typical refrigerant-dryer range
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Vaisala DMT153 Dew Point Transmitter
  • New
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Vaisala DMT153 Dew Point Transmitter for Ultra-Dry Applications

Vaisala DMT153 Dew Point Transmitter

The Vaisala DMT153 provides traceable low-dew-point measurement for ultra-dry industrial processes. It is the current replacement for the DMT152, with modern analog, Modbus and Vaisala Indigo connectivity.

  • Calibrated dew-point range from −80 to −20 °C Td/f
  • Dew-point accuracy up to ±2 °C Td/f
  • Operating pressure from vacuum to 50 bar absolute
  • Analog outputs or RS-485 with Modbus RTU
  • Compatible with Vaisala Indigo transmitters and Indigo80
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Vaisala DMP8 Dew Point Probe for Pressurised Pipelines

The Vaisala DRYCAP® Dew Point and Temperature Probe DMP8 provides reliable low-humidity measurement in pressurised pipelines with adjustable installation depth.

  • Dew point measurement range from −70 to +80 °C Td/f
  • Designed for pressurised processes from 0 to 40 bar absolute
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Vaisala DPT146 Dew Point and Pressure Transmitter – Discontinued
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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
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  • Pressure-compensated dew point and ppm calculation
  • Analog outputs and RS-485 with Modbus RTU
  • Contact Seacom for existing-unit support and replacement assessment
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Vaisala Indigo510 and Indigo520 Flagship Transmitters

Vaisala Indigo510 and Indigo520 Flagship Transmitters

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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Smart Dew Point Probe and Transmitter DMP7
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Vaisala DMP7 Compact Dew Point Probe for Tight Spaces

The Vaisala DRYCAP® Dew Point and Temperature Probe DMP7 is designed for accurate low-humidity measurement where installation space is limited.

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  • Dew point measurement range from −70 to +80 °C Td/f
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Vaisala DMT152 Dew Point Transmitter – Discontinued
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Vaisala DMT152 Dew Point Transmitter – Discontinued

Vaisala DMT152 Dew Point Transmitter for Very Dry Environments

The Vaisala DMT152 provides accurate dew-point measurement down to −80 °C Td/f for ultra-dry industrial and OEM applications. This model is discontinued and has been replaced by the Vaisala DMT153.

  • Calibrated dew-point range from −80 to −20 °C Td/f
  • Accuracy up to ±2 °C Td/f
  • Operating pressure up to 50 bar
  • Analog outputs and RS-485 communication
  • DRYCAP® sensor resistant to condensation and contamination
  • Use DMT153 for new projects
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Vaisala Indigo200 Series Transmitters

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Vaisala DMP6 Dew Point Probe for Processes up to 350 °C
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Vaisala DMT143 and DMT143L Miniature Dew Point Transmitters
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Vaisala DMT143 and DMT143L Miniature Dew Point Transmitters

Vaisala DMT143 and DMT143L Miniature Dew Point Transmitters

The Vaisala DMT143 and DMT143L provide compact, dependable dew-point measurement for small industrial dryers, compressed-air systems, glove boxes and OEM equipment.

  • Dew-point measurement range across the family from −70 to +60 °C Td/f
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