Vaisala PTU300 Pressure, Humidity and Temperature Transmitter – Discontinued

The Vaisala PTU300 combined barometric pressure, relative humidity and temperature in one transmitter. The series is discontinued and has been replaced by a suitable Indigo520 barometric-pressure configuration with an application-specific HMP probe.

  • Legacy three-in-one pressure, humidity and temperature transmitter
  • PTU301, PTU303, PTU304, PTU305, PTU307 and PTU308 variants
  • Former applications include laboratories, meteorology and semiconductor measurement
  • Current replacement platform: Indigo520 with barometric-pressure measurement
  • Humidity probe selected according to mounting and process conditions
  • Existing wiring, outputs and process connections require migration review

Vaisala PTU300 Combined Transmitter – Discontinued

The Vaisala PTU300 series was designed for applications requiring barometric pressure, relative humidity and temperature from one instrument. Typical uses included calibration-laboratory condition monitoring, meteorological systems, GPS meteorology, environmental measurement and compensation of precision optical or dimensional measurements.

Vaisala has discontinued the PTU300 series. New projects should use an appropriately configured Vaisala Indigo520 transmitter with barometric-pressure measurement and the HMP probe that matches the original PTU300 application.

Important replacement point: a standard humidity transmitter or HMP probe does not replace all three PTU300 measurements. The selected Indigo520 must include the required barometric-pressure capability, and the connected probe must suit the humidity, temperature, pressure and installation conditions.

PTU300 Replacement Selector

Discontinued modelFormer applicationCurrent Vaisala directionProduct link
PTU301 Wall-mounted humidity, temperature and barometric-pressure measurement Indigo520 barometric-pressure configuration with HMP1 View Vaisala HMP1
PTU303 General-purpose, duct or confined-space measurement Indigo520 barometric-pressure configuration with HMP3 or HMP9 View HMP3 or view HMP9
PTU304 High-pressure or vacuum applications up to the original model limits Indigo520 barometric-pressure configuration with HMP4 View Vaisala HMP4
PTU305 High-temperature processes Indigo520 barometric-pressure configuration with HMP5 View Vaisala HMP5
PTU307 Continuous high humidity and meteorological applications Indigo520 barometric-pressure configuration with HMP7 View Vaisala HMP7
PTU308 Pressurised pipelines with adjustable insertion Indigo520 barometric-pressure configuration with HMP8 View Vaisala HMP8

These mappings identify the closest current Vaisala product families; they do not guarantee a drop-in replacement. Review the complete PTU300 order code and installed arrangement before selecting the Indigo520, probe, adapter plate, cable and process accessories.

Indigo520 Barometric-Pressure Configuration

FeatureCurrent Indigo520 barometric-pressure solution
Absolute-pressure range 500 to 1100 hPa
Total pressure accuracy Up to ±0.15 hPa under specified conditions
Probe capacity Supports two detachable compatible probes simultaneously
Display Large optional touchscreen display
Analogue outputs Four configurable galvanically isolated outputs
Relays Two configurable relays
Digital communication Ethernet with web interface and Modbus TCP/IP
Enclosure IP66 and NEMA 4 rated metal enclosure
PTU300 retrofit Adapter-plate installation is available for applicable PTU300 replacement projects

Pressure units can include hPa, mbar, kPa, Pa, inHg, mmH2O, mmHg, torr and psia. Confirm the required unit, scaling and output assignment during configuration.

Legacy PTU300 Specifications

SpecificationFormer PTU300 capability
Measured parameters Barometric pressure, relative humidity and temperature; model-dependent configuration
Pressure ranges 50 to 1100 hPa or 500 to 1100 hPa, depending on model
Humidity range Approximately 0 to 100 %RH according to the selected probe and conditions
Temperature range Probe- and configuration-dependent
Pressure accuracy classes Multiple accuracy classes and optional dual pressure sensors were available
Local display Optional graphical display
Outputs Analogue outputs and serial communication options according to configuration
Supply Configuration-dependent DC or optional power-module arrangements

Select the Correct HMP Probe

Installation conditionRecommended probeMain strength
Laboratory or indoor wall HMP1 Compact wall-mounted humidity and temperature measurement
General process or duct HMP3 General-purpose 12 mm probe with field-maintenance options
Very confined space HMP9 Compact 5 mm sensing head and fast response
High pressure or vacuum HMP4 Threaded installation for demanding pressure conditions
High process temperature HMP5 Long probe for processes up to +180 °C at the probe head
Continuous high humidity HMP7 Heated-probe arrangement for near-condensing environments
Pressurised pipeline HMP8 Adjustable insertion depth and pressure-tight process installation

Information Needed for PTU300 Replacement

  • Complete PTU300 model and order code
  • Photographs of the transmitter, probe and installation
  • Required pressure range, accuracy and engineering unit
  • Humidity and temperature operating ranges
  • Process pressure and gas composition where applicable
  • Wall, duct, chamber, high-temperature or pipeline installation
  • Existing analogue-output ranges and serial communication
  • Relay, display, Ethernet and local-access requirements
  • Supply voltage, cable length and wiring arrangement
  • Available space and requirement for a PTU300 adapter plate

PTU300 Migration Checks

  1. Record the existing instrument order code, configuration and output scaling before disconnection.
  2. Confirm which of the three measurements are actually used by the receiving system.
  3. Select the Indigo520 barometric-pressure option and suitable HMP probe.
  4. Compare mechanical mounting, probe connection, insertion depth and environmental protection.
  5. Review power, cable entries, analogue channels, relays and communication protocols.
  6. Update PLC, data-acquisition or monitoring-system scaling where required.
  7. Commission all pressure, humidity and temperature channels against suitable references.
  8. Update drawings, calibration records, spare-parts lists and maintenance procedures.

Do not copy the old scaling blindly: PTU300 variants could have different pressure ranges, probes and outputs. Verify every active channel against the receiving controller and the new Indigo520 configuration during commissioning.

Typical Replacement Applications

  • Calibration laboratories requiring environmental pressure, humidity and temperature records
  • Semiconductor manufacturing and photolithography environments
  • Laser interferometer wavelength compensation
  • GPS meteorology and atmospheric measurement
  • Professional meteorological installations
  • Environmental monitoring and precision-measurement rooms
  • Pressurised industrial processes requiring humidity and temperature measurement alongside barometric pressure

Calibration and Maintenance

A three-parameter installation requires a calibration plan covering barometric pressure, humidity and temperature. Calibration intervals should reflect the required uncertainty, operating environment, historical drift and quality-system requirements.

The detachable Indigo probes simplify service because a calibrated replacement probe can reduce measurement downtime. However, the barometric-pressure channel belongs to the selected transmitter configuration and must be included separately in the calibration and verification plan.

Vaisala PTU300 Replacement and Technical Support in Malaysia

Seacom Process Instruments supports existing Vaisala PTU300 installations in Malaysia and supplies current Indigo520 barometric-pressure configurations with suitable HMP humidity and temperature probes.

Our team can review the former PTU301, PTU303, PTU304, PTU305, PTU307 or PTU308 installation, select the appropriate Indigo520 and probe combination, check mounting and signal compatibility, and assist with commissioning and calibration planning.

Replacing a PTU300? Send us the complete order code, installation photographs, pressure range, humidity and temperature conditions, output scaling and receiving-system details. We will help identify a suitable current Vaisala configuration.

Download

  HMP9 Catalogue   (241.64k)

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  HMP5 Catalogue   (217.62k)

  DMP7 Catalogue   (180.16k)


Specific References

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