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DPT145 catalogue
3-in-1 Dewpoint, Pressure, Temperature Transmitter for SF6 Gas DPT145
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Vaisala DPT145 SF6 Multiparameter Transmitter – Discontinued
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
| Parameter | Type | Measurement 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
| Specification | DPT145 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.
15 other products in the same category:
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
- Two-wire, loop-powered 4–20 mA output
- Operating pressure up to 20 bar
- Resistant to condensation and compressor oil
- Optional warning LED and loop-powered display
The Vaisala DMT345 and DMT346 provided direct dew-point measurement in hot industrial drying processes. Both models are discontinued and replaced by Vaisala DMP5 or DMP6 smart probes with an Indigo transmitter.
- DMT345: former solution for processes up to +180 °C
- DMT346: former solution for very hot processes up to +350 °C
- DMT345 replacement: DMP5 with a suitable Indigo transmitter
- DMT346 replacement: DMP6 with a suitable Indigo transmitter
- Direct in-process measurement without a conventional sampling system
- Contact Seacom for mechanical and electrical migration review
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
- DRYCAP® sensor with automatic calibration and sensor purge
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
- Indigo520: two probes, four isolated outputs and two relays
- Ethernet web interface and Modbus TCP communication
- Rugged IP66 and NEMA 4 metal enclosure
The Vaisala DRYCAP® Dew Point Probe DMP6 measures humidity directly inside very hot industrial processes using a robust probe and passive cooling set.
- Direct in-line measurement at process temperatures from +100 to +350 °C
- Dew point measurement range from −25 to +100 °C Td/f
- Passive cooling requires no power, cooling water or moving components
- Built-in Modbus RTU or integration with Vaisala Indigo transmitters
- Connect to Indigo80 for portable display, diagnostics, configuration and field calibration
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
- Adjustable insertion depth with ISO R 1/2 or NPT 1/2 process connection
- Optional ball-valve kit permits insertion and removal without shutting down the process
- Use with Modbus RTU, an Indigo transmitter or the portable Indigo80 handheld indicator
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
- Accuracy up to ±2 °C Td/f
- Vaisala DRYCAP® technology with automatic calibration
- Resistant to condensation, compressor oil and particulate contamination
- Analog output and RS-485 with Modbus RTU options
- Compatible with the Vaisala Indigo80 handheld indicator
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
The Vaisala Indigo200 Series is the standard transmitter platform for one interchangeable Indigo-compatible smart probe, providing local display and practical automation-system connectivity.
- Indigo201 with three analog outputs and two relays
- Indigo202 with Modbus RTU and two relays
- Colour display with numerical and graphical views
- IP65 enclosure for industrial measurement applications
The Vaisala DMT340 Series provided configurable dew-point and temperature measurement for industrial low-humidity applications. The series is discontinued and replaced by Vaisala Indigo500 transmitters with DMP7 or DMP8 smart probes.
- Former models: DMT341, DMT342, DMT344, DMT347 and DMT348
- Designed for dry rooms, industrial dryers, compressed air and process gases
- Legacy display, data logging, analog, relay and communication options
- Use DMP7 for compact, wall-mounted or tight-space applications
- Use DMP8 for pressurised processes and pipelines
- Pair the selected probe with an Indigo500 transmitter
The Vaisala DMP1 Dew Point and Temperature Probe provides fast, dependable low-humidity measurement for dry rooms and moisture-sensitive manufacturing areas.
- 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
- Suitable for battery production, semiconductor manufacturing and controlled dry environments
The Vaisala Indigo300 is a rugged industrial transmitter for one Vaisala Indigo-compatible smart probe, providing local measurement display and up to three configurable analog outputs.
Its corrosion-resistant IP66 metal enclosure, flexible probe mounting and interchangeable probe design make Indigo300 suitable for humidity, temperature, dew point, CO2, moisture in oil and other demanding industrial measurements.
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
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
- Dew point measurement range from −40 to +100 °C Td/f
- Long probe reaches through insulation and thick process walls
- Built-in Modbus RTU or integration with Vaisala Indigo transmitters
- Connect to Indigo80 for portable display, diagnostics, configuration and field calibration
The Vaisala DRYCAP® Dew Point and Temperature Probe DMP7 is designed for accurate low-humidity measurement where installation space is limited.
- Short 41 mm probe for remote installation in tight spaces
- Dew point measurement range from −70 to +80 °C Td/f
- Pressure-tight installation for processes from 0 to 10 bar
- Use with Modbus RTU, an Indigo transmitter or the portable Indigo80 handheld indicator
- Suitable for dry rooms, compressed air, industrial drying and semiconductor equipment