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.

Indigo platform includes

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 

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 

Insight PC software

Easy self-service & data visualization

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

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

Indigo520 with probe

Indigo500 Series Transmitters

The Vaisala Indigo500 series transmitters are host devices for Vaisala Indigo-compatible, stand-alone smart probes. The Indigo500 series include multi-functional Indigo520 transmitter and Indigo510 transmitter with basic features.

What you can measure with Indigo-compatible 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.


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.


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.


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.


Moisture in oil

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

Moisture in oil (MiO)

Barometric pressure

Vaisala’s proprietary BAROCAP® micromechanical sensor uses dimensional changes in its silicon membrane to measure pressure.


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.

Liquid concentration

Indigo compatible probes

Explore all products

Relative Humidity and Temperature Probe HMP8

Vaisala HUMICAP® Humidity and Temperature Probe HMP8 is designed for pressurized applications in compressed air systems, refrigerant dryers, and other pressurized industrial applications where easy insertion and removal of the probe and adjustable installation depth into the pipeline are needed.

Vaisala Temperature Probe TMP1 is designed for demanding temperature measurements in industrial applications.

Temperature Probe TMP1

Vaisala Temperature Probe TMP1 is designed for demanding temperature measurements in industrial applications such as pharmaceutical industry and calibration laboratories, where accuracy and robustness are essential.

Create your Indigo combination

Indigo software and firmware

Vaisala Insight PC Software gives quick access to the configurations and data of the Indigo family measurement probes and other supported Vaisala devices. Download latest software and firmware versions.

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.

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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.

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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.

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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.

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When the stakes are high, choose Indigo!

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