Vaisala Indigo500 Series Transmitters

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The Vaisala Indigo520 transmitter with dual-probe and multi-parameter support is a host device for Vaisala Indigo-compatible, stand-alone smart probes. The transmitter offers many additional features to the Indigo probes. 

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, compared to using just a smart probe. It also provides mechanical support when wall-mount probe installation is preferred.​ Rugged IP66- and NEMA4-rated  metal enclosure ensures reliable performance even in the harshest conditions.

The Indigo-compatible smart probes include humidity probes (HMP3med, HMP4, HMP5, HMP7, HMP8 and HMP9), dew point probes (DMP5, DMP6, DMP7 and DMP8),  carbon dioxide probes (GMP251 and GMP252), moisture in oil probe (MMP8), temperature probe (TMP1), and vaporized hydrogen peroxide probes (HPP270). The Indigo520 is also compatible with MHT410 Moisture, Hydrogen and Temperature Transmitter for power transformer online monitoring

The Indigo520 transmitter can accommodate up to two probes simultaneously. The plug-and-play probes are easy to install and remove for calibration.


  • Universal transmitter for Vaisala Indigo-compatible probes
  • Supports two probes simultaneously
  • Touchscreen display
  • IP66- and NEMA4-rated metal enclosure
  • 4 configurable analog outputs
  • 2 relays
  • Ethernet connection with web interface for remote access
  • Modbus TCP/IP protocol
  • Multiple powering options including Power over Ethernet (PoE) and AC mains power

Key Benefits

Touchscreen gives easy access to probe data
Intuitive touchscreen provides local data visualization. It also enables access to probe configuration.
Two simultaneous measurements
Dual-probe support allows simultaneous measurements with two Vaisala Indigo-compatible probes for humidity, temperature, dew point temperature, carbon dioxide, hydrogen peroxide, and moisture in oil measurements.
Rugged design with metal enclosure
A metal enclosure with IP66 and NEMA4 classification makes Indigo 520 suitable even for the harshest conditions. The touchscreen is made of chemically strengthened glass, making it robust even in demanding industrial applications.
Analog and digital outputs
The transmitter has 4 analog channels that can be configured to mA or voltage type and 2 configurable relays. Any of the output parameters from the connected probes can be assigned to control the analog channels and relays. Digital output protocol is Modbus TCP/IP over Ethernet. Besides ModBus TCP/IP, the transmitter's Ethernet connection provides a web interface and cyber-security that meets the modern standards.
Extended power supply options
Indigo 520 extends also the power supply options of the Indigo-compatible measurement probes. Multiple power supply options are available:
• Protected extra-low voltage (PELV) version: 15 … 35 VDC, 24 VAC ±20%
• Main power version: 100 … 240 VAC 50/60 Hz
• Power over Ethernet (PoE) version: 50 VAC PoE+
Time-savings and reduced downtime with plug-and-play design
Plug-and-play Indigo-compatible probes are easy to attach, ensuring fast installation. Probes can be attached into the transmitter by using a connection cable, which allows up to a 30-meter distance between the probe and the transmitter.

The plug-and-play design also allows easy swapping of the probes, when calibration or maintenance is needed. This saves time and reduces downtime.

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