Indigo Family

The modular platform

Discover the modular Indigo

The Vaisala Indigo family is a customizable instrument platform designed to improve process measurements. The Indigo family's key feature is modularity. It contains a selection of transmitters, interchangeable smart probes that measure various parameters, and software for easy interfacing and monitoring of data. Choose any probe and connect it with any of the transmitters, or integrate the probes into other systems. The Indigo platform is built on top of Vaisala’s self-produced, core sensor technologies.

Whether you measure humidity, temperature, dew point, moisture in oil, carbon dioxide, barometric pressure, or vaporized hydrogen peroxide, the accuracy and long-term stability of Indigo-compatible probes are in the class of their own. The probes deliver repeatable measurement with high resolution, providing you with data that you can rely on, which helps you to make better decisions – over the long term.

Browse the Indigo family products

Humidity and temperature

The Indigo-compatible humidity probes are based on Vaisala’s proprietary HUMICAP® technology recognized for its excellent long-term stability, sensor heating for condensing environments and full recovery from condensation, insensitivity to dust and most chemicals, and chemical purge option. Choose from the following probes to suit your needs.

  • HMP1 is designed for measuring ambient measurement in indoor spaces.
  • HMP3 is suitable for various industrial applications with moderate humidity and temperature levels in industrial HVAC systems, paint booths, cleanrooms, environmental chambers, and applications.
  • HMP4 is for high pressure applications, such as compressed air systems in maritime, breathing air, and industrial applications
  • HMP5 is for high temperature application like baking ovens, pasta dryers, ceramics and industrial drying kilns 
  • HMP7 is designed for applications which involve constant high humidity or rapid changes in humidity, such as drying and test chambers, combustion air, and other humidifiers and meteorological measurements
  • HMP8 is designed for pressurized applications in compressed air systems, refrigerant dryers, and other pressurized industrial applications.
  • HMP9 is a compact probe suitable for rapidly changing environments where a fast response time, measurement performance, and chemical tolerance are essential
  • TMP1 is designed for demanding temperature measurements in industrial applications, such as pharmaceutical industry and calibration laboratories

Dew point

The Indigo-compatible dew point probes are based on Vaisala’s DRYCAP® technology whose unrivalled performance is based on the capacitive thin-film polymer sensor and the auto-calibration function. Probes with the DRYCAP sensor deliver accurate measurements in the long term, dramatically reducing the need for maintenance. Choose from the following probes to suit your needs.

  • DMP5 for in-line measurement in high temperature applications <180 °C (356 °F), such as in industrial drying

  • DMP6 for in-line measurements in very high temperatures <350 °C (660 °F)

  • DMP7 for remote installations in tight spaces with measurement range to -70 °C (-94 °F). Application examples include semiconductor manufacturing equipment, industrial drying systems, compressed air systems, and dry rooms

  • DMP8 for pressurized pipelines <40 bars with measurement range to -70 °C (-94 °F). Typical applications include industrial drying, compressed air systems, and applications in the semiconductor industry

Carbon dioxide (CO2)

Indigo-compatible carbon dioxide (CO2) probes are based on Vaisala’s unique CARBOCAP® technology that enables exceptional stability. They are ideal for applications such as incubators, greenhouses, fruit and vegetable storage and cargo, animal shelters and demand-controlled ventilation.
Choose from the following probes to suit your needs:

  • GMP251  for %-level measurements 0 – 20 %CO2 in life science incubators, cold storage facilities, fruit and vegetable transportation, and in all other demanding applications
  • GMP252  for ppm-level measurements 0 – 10 000 ppmCO2 in agriculture, refrigeration, greenhouses, demanding HVAC applications, and for plant growth chamber manufacturers

Vaporized hydrogen peroxide (H2O2)

Indigo-compatible vaporized hydrogen peroxide probes feature Vaisala’s unique PEROXCAP® technology. which enables accurate and repeatable measurement of the bio-decontamination cycle with one single probe. Choose from the following probes to suit your needs:

  • HPP270 series for measuring H2O2 vapor concentration, humidity and temperature in demanding hydrogen peroxide bio-decontamination processes

Moisture in oil

The Moisture in Oil Probe uses the proven Vaisala HUMICAP® sensor that was developed for demanding moisture measurements.

  • MMP8 is designed for demanding and continuous online moisture measurements in transformer and lubrication oils, hydraulic fluids, and other liquids

Liquid concentration

The Vaisala Polaris process refractometers combined with the Indigo520 for process refractometers offers compelling features for liquid concentration measurements and extend the process refractometer functionalities with data logging, wash control, trends, settings, measurement parameters, and more. 

Indigo transmitters

Indigo transmitters are host devices for Vaisala Indigo-compatible, stand-alone smart probes. The local display in the transmitter is useful, when something isn’t clear or there’s a problem, or when performing maintenance work in the field. Also, data from probes is shown on the transmitter display, allowing users to view what is going on. All the Indigo probes can be connected to any of the Indigo transmitters and changed on without interrupting the process, which reduces downtime. Choose from the following transmitters to suit your needs.

  • Indigo500 series transmitter offers dual-probe and multi-parameter support. The touchscreen display provides local data visualization and easy access to probe configuration. The transmitter also extends the options for connectivity, supply voltage, and wiring.
  • Indigo300 series transmitters send measurement values to automation and control systems through pre-configured analog signals, and they can also be used for standalone monitoring.
  • Indigo200 series transmitters allow for easy evaluation and visualization of data.

Indigo handhelds

Vaisala's Indigo80 Handheld Indicator is an industrial-grade portable meter designed for troubleshooting, calibrating, and adjusting Vaisala Indigo-compatible probes. Ideal for spot-checking sensor accuracy, as well as short-term data logging and process monitoring, the Indigo80 can communicate simultaneously with up to two Vaisala probes and transmitters to provide accurate measurements for a wide range of parameters.

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Insight PC software gives quick access to the configurations and data of the Indigo-compatible measurement probes. The probes can be detached from the process and connected to a PC with an USB cable for set-up and field calibration. The software makes changing the settings and calibrating the device easy with intuitive graphical user interface; just launch the software and connect the USB cable. Up to six devices can be connected simultaneously.

Download the latest version of the Indigo500 software

Key benefits

Indigo probes

Extreme accuracy & stability

  • Comprehensive probe selection measuring various parameters: humidity, temperature, dew point, moisture in oil, carbon dioxide, barometric pressure, or vaporized hydrogen peroxide
  • Based on premium Vaisala sensor technologies 
  • Use as a stand-alone device or with Indigo transmitters
  • Modern, compact design 

Indigo transmitters

Value-adding functionalities

  • Plug-and-play probe connection 
  • Dual-probe model enables multi-parameter measurement
  • Display for easy evaluation and visualization of data 
  • Additional connectivity, power and wiring options 

Insight PC software

Easy self-service & data visualization

  • User-friendly graphical interface
  • Quick access to probe data
  • Smooth field calibration
  • Easy probe configuration

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    Explore Indigo's modularity

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    With one probe

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    With two probes

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    Read what our customers and experts say about Indigo


    Do I need an Indigo transmitter or just an Indigo probe?

    There are many probe options to choose from measuring several parameters: humidity, temperature, dew point, CO2, moisture in oil, and vaporized hydrogen peroxide. The probes can be attached to Indigo500 or Indigo200 series transmitter. When is a probe sufficient on its own – and when do you need both a probe and a transmitter?

    Read more


    Modbus 101

    Digital communication may sound complicated, expensive, and difficult to implement. Join this webinar where our experts will give an introduction to the Modbus protocol, including the benefits compared to analog outputs.

    Register to watch

    Customer case

    Malting process improved using Indigo500 with HMP7 and TMP1 probes

    As one of the world’s leading suppliers of high quality malt products, Viking Malt has investigated the advantages of continuous humidity monitoring inside the malting process at its facility using Vaisala’s Indigo520 and  HMP7 and TMP1 probes.

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    Customer case

    Stable H2O2 vapor sensing with Indigo201 transmitter and HPP272 probe as a bio-decontamination game-changer

    Van Veldhuijzen-Boxmeer Disinfection Services has been providing sterilization and bio-decontamination services since 1990. Their services include microbiological analysis of surfaces, air and water. Common applications serviced include Biosafety level 3 laboratories, animal housing, cleanrooms, and safety cabinet air handling units.

    Learn more

    Customer case

    Optimized drying process helps Isolava cut energy consumption and improve end-product quality

    Isolava began a project to optimize the drying process, led by Project Engineer Peter Vaneyghen. The first step was to install humidity sensors in the dryer in order to get a better understanding of the dynamics of the drying process. The consumption of natural gas alone has decreased by some 20% and the annual savings across all ten dryers add up to hundreds of thousands of euros.

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    Indigo500 series dual-probe support

    Learn about the benefits of using two probes measuring either the same parameter or two different ones.

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    How to maintain world-class measurement performance

    In this free webinar we share the key success factors for maintaining world-class measurement performance for your instruments.

    Register to watch

    Customer case

    Vaisala probes facilitate rollout of environmentally friendly refrigeration

    Supermarkets all over Australia and New Zealand are benefiting from advanced carbon dioxide monitors as new natural refrigeration systems are installed in the fight against climate change. Woolworths, and its cold chain partner Emerson, therefore needed an accurate, reliable CO2 monitor that could fulfill this vital role as the Group expands the use of natural refrigerants in its stores.

    Learn more

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