---
title: "Thiamis | IoT Gateway for Third-Party Environmental Sensors"
description: "Thiamis is an IoT gateway that connects third-party environmental sensors to the Aethair platform over RS-232, RS-485, SDI-12, and USB, live over 4G LTE."
url: https://aethair.io/products/thiamis/
---

Aethair devices

# Thiamis

IoT Gateway for Connecting Third-Party Sensors to the Aethair Platform

Thiamis brings the instruments you already own onto the same platform as [Aethair PRO](https://aethair.io/products/pro/) and [Aethair IAQ](https://aethair.io/products/iaq/). Four wired interfaces connect 35 sensor integrations covering 224 device models in the sensor catalog today. Thiamis logs every reading, stamps it with its GPS position, and sends it to the Aethair Cloud over 4G LTE on a built-in SIM (cellular data included) or over the site's Wi-Fi, so nobody has to drive out to retrieve data. You need it only for instruments you already own, or ones the Aethair monitors don't carry; Aethair PRO and Aethair IAQ report on their own ([which one fits](https://aethair.io/products/#fit)).

4 interfaces

224 device models

[Schedule a Thiamis Demo](https://calendly.com/d/ctdd-mkr-v9v/aethair-demo-website) [Browse compatible sensors](https://aethair.io/sensors/#external-sensors-thiamis)

![Thiamis IoT gateway wired to a sensor inside a field enclosure](https://aethair.io/images/products/products_preview_thiamis.webp)

Thiamis, the gateway for third-party instruments

Documents

- [Product Brochure PDF](https://aethair.io/pdfs/Aethair-Thiamis_Brochure.pdf)
- [Technical Specifications PDF](https://aethair.io/pdfs/AethairThiamis_SpecSheet.pdf)

Where it is used

## Where Thiamis Runs

Each tile opens its solution page. Or browse the sensor catalog by instrument type: [air quality and noise](https://aethair.io/sensors/?cat=Particulate%20%26%20Dust%20Monitors), [water](https://aethair.io/sensors/?cat=Water%20Quality%20Sondes) and [weather](https://aethair.io/sensors/?cat=Weather%20Stations). Fluid and fuel quality analyzers and I/O modules are listed under Ports and Protocols.

[![Aethair Thiamis connected to a TSI DustTrak PM monitor inside a weatherproof box with a heated inlet.](https://aethair.io/images/products/thiamis/aethair-thiamis-tsi-dusttrak.webp)](https://aethair.io/solutions/perimeter-monitoring/)

### [Perimeter and Fenceline Monitoring](https://aethair.io/solutions/perimeter-monitoring/)

[A TSI DustTrak in a weatherproof box with a heated inlet reports dust at the site boundary, alongside noise and weather instruments on the same gateway, with upwind and downwind roles for the perimeter report.](https://aethair.io/solutions/perimeter-monitoring/)

[![Aethair Thiamis transmitting environmental data from inside an Aethair Node enclosure connected to a weather sensor.](https://aethair.io/images/products/thiamis/thiamis-weather-sensor-connectivity.webp)](https://aethair.io/solutions/outdoor-monitoring/)

### [Outdoor and Weather Networks](https://aethair.io/solutions/outdoor-monitoring/)

[Weather stations, ambient analyzers, and near-reference particulate monitors such as the Met One E-BAM, on poles and rooftops, housed in an Aethair Node, the outdoor enclosure for Thiamis (see Hardware), reporting over 4G where there is no site network.](https://aethair.io/solutions/outdoor-monitoring/)

[![Aethair Thiamis housed inside an Aethair Node and connected to a Eureka water probe beside a body of water.](https://aethair.io/images/products/thiamis/thiamis-water-sensor.webp)](https://aethair.io/solutions/water-quality/)

### [Water Quality and Hydrology](https://aethair.io/solutions/water-quality/)

[Sondes and level sensors beside the water, streaming live readings from sites that have never had a network.](https://aethair.io/solutions/water-quality/)

In the catalog

## More Solutions Built on Thiamis

Every solution whose recommended configuration uses Thiamis, beyond the sites above.

### [Agriculture & Irrigation](https://aethair.io/solutions/agriculture/)

Soil moisture, microclimate, and frost warning

### [Aquaculture & Fish Farming](https://aethair.io/solutions/aquaculture/)

Dissolved oxygen, temperature, and ammonia control

### [Cabin Air Quality](https://aethair.io/solutions/cabin-air/)

Respirable dust, gases, and blast monitoring

### [Heat Stress & Outdoor Work](https://aethair.io/solutions/heat-stress/)

WBGT for worksites, athletics, and events

### [Hydraulic & Fuel Cleanliness](https://aethair.io/solutions/industrial-fluids/)

ISO 4406 oil cleanliness and aviation fuel

### [Hydrology, Level & Flow](https://aethair.io/solutions/hydrology/)

Flood warning, stream gauging, and groundwater

### [Landfill, Biogas & Odor](https://aethair.io/solutions/landfill-biogas/)

Methane, H₂S, and odor complaint response

### [Noise Monitoring](https://aethair.io/solutions/noise/)

Environmental and occupational sound levels

### [Occupational Safety & Industrial Hygiene](https://aethair.io/solutions/occupational-safety/)

Worker exposure, confined space, and heat stress

### [Oil & Gas / Petrochemical](https://aethair.io/solutions/oil-gas/)

Fence-line VOC, H₂S, and methane leak detection

### [Weather Stations & Meteorology](https://aethair.io/solutions/weather/)

Professional multi-parameter weather monitoring

### [Wildfire Air Monitoring](https://aethair.io/solutions/wildfires/)

Smoke plumes, black carbon, and community exposure

What it connects

## Compatible Sensors

The sensor catalog lists 28 manufacturers, 35 sensor integrations, and 224 device models today. Every one already runs on Thiamis, with monitoring, alerts, reports, and Environet dashboards working. Vendors below link to their devices; [browse the whole catalog](https://aethair.io/sensors/#external-sensors-thiamis) or [contact us](https://aethair.io/contact/) if your sensor is not listed (a new integration is typically added within a few days).

[2B Technologies 1](https://aethair.io/sensors/2b-technologies-specialty-air-analyzers/) [Advantech 12](https://aethair.io/sensors/advantech-i-o-integration-modules/) [AethLabs 4](https://aethair.io/sensors/aethlabs-specialty-air-analyzers/) [Airmar 13](https://aethair.io/sensors/airmar-weather-stations/) [AMETEK Brookfield 2](https://aethair.io/sensors/ametek-brookfield-specialty-air-analyzers/) [Cirrus Research 20](https://aethair.io/sensors/cirrus-research-noise-monitors/) [Davis 9](https://aethair.io/sensors/davis-weather-stations/) [Defiant Technologies 2](https://aethair.io/sensors/defiant-technologies-specialty-air-analyzers/) [Durridge 1](https://aethair.io/sensors/durridge-specialty-air-analyzers/) [Eureka Water Probes 9](https://aethair.io/sensors/eureka-water-probes-water-quality-sondes/) [Fluke Calibration 2](https://aethair.io/sensors/fluke-calibration-heat-stress-comfort/) [Gill Instruments 16](https://aethair.io/sensors/gill-instruments-weather-stations/) [In-Situ 14](https://aethair.io/sensors/in-situ-water-quality-sondes/) [Lufft 20](https://aethair.io/sensors/lufft-weather-stations/) [Met One 3](https://aethair.io/sensors/met-one-particulate-dust-monitors/) [Parker 1](https://aethair.io/sensors/parker-fluid-fuel-quality/) [Parker Velcon 2](https://aethair.io/sensors/parker-velcon-fluid-fuel-quality/) [Particles Plus 7](https://aethair.io/sensors/particles-plus-particulate-dust-monitors/) [R.M. Young 5](https://aethair.io/sensors/r-m-young-weather-stations/) [RAE 11](https://aethair.io/sensors/rae-gas-detectors/) [RKI Instruments 1](https://aethair.io/sensors/rki-instruments-gas-detectors/) [Spectra Scientific 2](https://aethair.io/sensors/spectra-scientific-water-quality-sondes/) [Temposonics 5](https://aethair.io/sensors/temposonics-water-level-flow/) [Thermo Scientific 6](https://aethair.io/sensors/thermo-scientific-particulate-dust-monitors/) [Trolex 5](https://aethair.io/vendors/trolex/) [TSI 31](https://aethair.io/vendors/tsi/) [Van Essen Instruments 4](https://aethair.io/sensors/van-essen-instruments-water-level-flow/) [YSI 16](https://aethair.io/sensors/ysi-water-quality-sondes/)

![Three sides of the Thiamis gateway: the GPS antenna port, SDI-12 with power, RS-485, and the LTE antenna port; the RS-232 MUX connector; and USB-C ports A and B.](https://aethair.io/images/products/thiamis/thiamis-ports.webp)

How it connects

## Ports and Protocols

Every instrument connects to one of these ports, and the protocol each one uses is listed below it. The first side has the SDI-12 and RS-485 buses and the GPS and LTE antenna connectors. The second has the RS-232 MUX connector, which provides three RS-232 ports with the 3-to-1 expansion cable. The third has two USB-C ports.

In all, **224** external device models (particulate monitors, gas analyzers, weather stations, noise dosimeters, water-quality probes, and more) stream to the Aethair Cloud alongside Aethair's own devices. Each interface below lists what plugs into it. A model that supports more than one interface is listed under each, so the per-interface counts overlap. [Browse all 224](https://aethair.io/sensors/#external-sensors-thiamis) or [build a custom configuration](https://aethair.io/build/).

### RS-232

3 ports on Thiamis

153 device models

Protocols

ASCII C-Link Modbus RTU NMEA 0183

Categories (integrations)

[Particulate & Dust Monitors 6](https://aethair.io/sensors/?cat=Particulate%20%26%20Dust%20Monitors) [Specialty Air Analyzers 3](https://aethair.io/sensors/?cat=Specialty%20Air%20Analyzers) [Water Quality Sondes 3](https://aethair.io/sensors/?cat=Water%20Quality%20Sondes) [Weather Stations 3](https://aethair.io/sensors/?cat=Weather%20Stations) [Fluid & Fuel Quality 2](https://aethair.io/sensors/?cat=Fluid%20%26%20Fuel%20Quality) [Heat Stress & Comfort 2](https://aethair.io/sensors/?cat=Heat%20Stress%20%26%20Comfort) [Noise Monitors 2](https://aethair.io/sensors/?cat=Noise%20Monitors) [Gas Detectors 1](https://aethair.io/sensors/?cat=Gas%20Detectors)

Vendors

[2B Technologies](https://aethair.io/sensors/2b-technologies-specialty-air-analyzers/) [AMETEK Brookfield](https://aethair.io/sensors/ametek-brookfield-specialty-air-analyzers/) [Airmar](https://aethair.io/sensors/airmar-weather-stations/) [Cirrus Research](https://aethair.io/sensors/cirrus-research-noise-monitors/) [Davis](https://aethair.io/sensors/davis-weather-stations/) [Durridge](https://aethair.io/sensors/durridge-specialty-air-analyzers/) [Eureka Water Probes](https://aethair.io/sensors/eureka-water-probes-water-quality-sondes/) [Fluke Calibration](https://aethair.io/sensors/fluke-calibration-heat-stress-comfort/) [Gill Instruments](https://aethair.io/sensors/gill-instruments-weather-stations/) [In-Situ](https://aethair.io/sensors/in-situ-water-quality-sondes/) [Met One](https://aethair.io/sensors/met-one-particulate-dust-monitors/) [Parker](https://aethair.io/sensors/parker-fluid-fuel-quality/) [Parker Velcon](https://aethair.io/sensors/parker-velcon-fluid-fuel-quality/) [Particles Plus](https://aethair.io/sensors/particles-plus-particulate-dust-monitors/) [RAE](https://aethair.io/sensors/rae-gas-detectors/) [TSI](https://aethair.io/vendors/tsi/) [Thermo Scientific](https://aethair.io/sensors/thermo-scientific-particulate-dust-monitors/) [YSI](https://aethair.io/sensors/ysi-water-quality-sondes/)

### RS-485

1 port on Thiamis

64 device models

Protocols

ASCII Modbus RTU UMB

Categories (integrations)

[Particulate & Dust Monitors 2](https://aethair.io/sensors/?cat=Particulate%20%26%20Dust%20Monitors) [Water Quality Sondes 2](https://aethair.io/sensors/?cat=Water%20Quality%20Sondes) [I/O & Integration Modules 1](https://aethair.io/sensors/?cat=I%2FO%20%26%20Integration%20Modules) [Water Level & Flow 1](https://aethair.io/sensors/?cat=Water%20Level%20%26%20Flow) [Weather Stations 1](https://aethair.io/sensors/?cat=Weather%20Stations)

Vendors

[Advantech](https://aethair.io/sensors/advantech-i-o-integration-modules/) [In-Situ](https://aethair.io/sensors/in-situ-water-quality-sondes/) [Lufft](https://aethair.io/sensors/lufft-weather-stations/) [Particles Plus](https://aethair.io/sensors/particles-plus-particulate-dust-monitors/) [Spectra Scientific](https://aethair.io/sensors/spectra-scientific-water-quality-sondes/) [Temposonics](https://aethair.io/sensors/temposonics-water-level-flow/) [Trolex](https://aethair.io/vendors/trolex/)

### SDI-12

1 port on Thiamis

28 device models

Protocols

SDI-12

Categories (integrations)

[Water Quality Sondes 2](https://aethair.io/sensors/?cat=Water%20Quality%20Sondes) [Water Level & Flow 1](https://aethair.io/sensors/?cat=Water%20Level%20%26%20Flow) [Weather Stations 1](https://aethair.io/sensors/?cat=Weather%20Stations)

Vendors

[Eureka Water Probes](https://aethair.io/sensors/eureka-water-probes-water-quality-sondes/) [R.M. Young](https://aethair.io/sensors/r-m-young-weather-stations/) [Van Essen Instruments](https://aethair.io/sensors/van-essen-instruments-water-level-flow/) [YSI](https://aethair.io/sensors/ysi-water-quality-sondes/)

### USB

2 ports on Thiamis

22 device models

Protocols

ASCII Modbus RTU

Categories (integrations)

[Gas Detectors 2](https://aethair.io/sensors/?cat=Gas%20Detectors) [Specialty Air Analyzers 2](https://aethair.io/sensors/?cat=Specialty%20Air%20Analyzers) [Water Quality Sondes 1](https://aethair.io/sensors/?cat=Water%20Quality%20Sondes)

Vendors

[AethLabs](https://aethair.io/sensors/aethlabs-specialty-air-analyzers/) [Defiant Technologies](https://aethair.io/sensors/defiant-technologies-specialty-air-analyzers/) [In-Situ](https://aethair.io/sensors/in-situ-water-quality-sondes/) [RKI Instruments](https://aethair.io/sensors/rki-instruments-gas-detectors/) [TSI](https://aethair.io/vendors/tsi/)

What you get from it

## What You Get From Thiamis

Every reading goes to the Aethair Cloud and appears in Environet. Each outcome below is a product you can read about.

### Proven in a regulator's network

South Coast AQMD's [published ozone sensor network](https://pmc.ncbi.nlm.nih.gov/articles/PMC6982912/) in the San Bernardino Mountains ran on Thiamis and Environet, averaging readings at the edge and logging through connectivity outages.

### [Live data and alerts](https://aethair.io/platform/environet/)

[Environet](https://aethair.io/platform/environet/) shows every device live and alerts the people you choose by email, SMS, and webhook, on a reading or its average over any window from 5 minutes to 30 days. The connected instrument's readings are alerted on like any Aethair device's. [Noesis](https://aethair.io/platform/noesis/) fills in a dashboard, a report, or an alert from a plain-text request.

### [Compliance reports](https://aethair.io/platform/reports/)

[Aethair Reports](https://aethair.io/platform/reports/) writes scheduled or on-demand reports, as PDF or secure link, from templates for Aethair Blue, WELL v2, cabin air (ISO 23875), and the CMS-2567 healthcare codebook (ASHRAE 170), or against custom limits such as OSHA PELs, NAAQS, or EPA guidance, each on the average you define. Reports draw on a connected instrument's readings against the standard or internal program limit you choose. [See a sample report](https://aethair.io/docs/aethair-office-air-quality-report-example.pdf).

### [Dashboards and the app](https://aethair.io/platform/dashboards/)

Environet dashboards and the [Aethair App](https://aethair.io/platform/app/) show a connected instrument's readings like any Aethair device's. The occupant-facing [Aethair Dashboards](https://aethair.io/platform/dashboards/) status display is built around Aethair IAQ and Aethair PRO.

### Your data, stored until delivered

Thiamis caches the readings of its connected sensors on the device until they are delivered, so a connectivity outage delays readings instead of dropping them, and raw readings are stored exactly as the instrument sent them. Every reading is encrypted in transit to the Aethair Cloud and platform access is role-based. Live and historical readings export as JSON or CSV through the [Environet API](https://docs.environet.io/) (OpenAPI 3.2). You own your devices and data, can grant partners controlled access, and readings are kept for as long as you need them (at least two years after a project ends) and deleted only at your request.

### One account for every site

Connected instruments sit next to Aethair PRO and Aethair IAQ in the same Environet account: one console, the same alerts, reports, and Environet dashboards for every device, and an existing installation is modernized without replacing the instrument.

### Wind-aware perimeter sites

Mark each instrument upwind or downwind, pair a weather station on the same gateway, and Environet plots a wind rose and the upwind-to-downwind difference; the [perimeter report](https://aethair.io/platform/reports/) carries both.

How it is built

## Thiamis Hardware

Interfaces and protocols are listed above. All other specifications are listed below.

### General

| Input voltage | 12 VDC, USB-C |
| - | - |
| Power | 4.6 W |
| Operating temperature | −30 °C to 75 °C (−22 °F to 167 °F) |
| Certifications | CE, FCC, PTCRB |
| Field housing | Aethair Node enclosure for outdoor sites (specifications on request) |
| Polling | Each connected instrument polled on a configurable interval, one minute by default |
| Updates | Firmware, instrument drivers, and configuration over the air, from Environet |

### Communications

| Cellular | 4G LTE / 3G / 2G |
| - | - |
| WiFi | 802.11 b/g/n |
| Bluetooth | Bluetooth 4.0 |
| Mesh | Zigbee |
| GPS | A-GPS, sensitivity > −165 dBm, 3 m accuracy |
| Antenna | Built-in (2G/3G/4G, GPS, Zigbee, Bluetooth); external MCX female for cellular and GPS optional |
| SIM card | Built-in; cellular data included, no network fee |

### On-board sensors

| Temperature | 0–45 °C, resolution 0.1 °C, maximum error ±0.5 °C from 15–30 °C |
| - | - |
| Humidity | 15–75 % RH, resolution 0.1 % RH, maximum error ±2 % RH |
| Barometer | 300–1100 hPa, resolution 0.12 Pa, maximum error ±1.3 Pa |

Source: [Thiamis Technical Specifications](https://aethair.io/pdfs/AethairThiamis_SpecSheet.pdf) (Rev. 1.0, January 2023).

Still deciding?

## The Aethair Monitors: Aethair PRO and Aethair IAQ

### [Aethair PRO](https://aethair.io/products/pro/)

[Industrial monitor for indoor and outdoor sites. Built-in sensors cover the essentials, and hot-swappable gas sensor cartridges and a differential-pressure option add more.](https://aethair.io/products/pro/)

[13 built-in parameters (PM2.5, PM10, noise, temperature …), plus 19 swappable cartridges (H₂S, SO₂, NO₂, CO, O₃, CH₄ and more) in 2 gas sockets, 1 MultiSense socket, and 1 expansion socket](https://aethair.io/products/pro/)

[See Aethair PRO](https://aethair.io/products/pro/)

### [Aethair IAQ](https://aethair.io/products/iaq/)

[Compact plug-in monitor with every sensor built in, nothing to add. Ideal for straightforward indoor air quality monitoring.](https://aethair.io/products/iaq/)

[13 built-in parameters: CO₂, PM2.5, PM10, tVOC and more](https://aethair.io/products/iaq/)

[See Aethair IAQ](https://aethair.io/products/iaq/)

Article Library

## Reading for Thiamis Deployments

Guides where instruments you already own come into the same account through Thiamis.

### [Ambient Air Quality Monitoring: What Nonattainment Changes](https://aethair.io/resources/ambient-air-quality-monitoring/)

Ambient air quality monitoring explained: how PM2.5 attainment is measured, what a nonattainment designation triggers, and what site-level monitoring adds.

### [Air Quality Near Data Centers: What Communities Should Know](https://aethair.io/resources/air-quality-near-data-centers/)

Air quality near data centers: construction dust, diesel generator emissions, and noise, and how communities get independent monitoring data.

### [Data Center Air Quality Monitoring, Inside and Out](https://aethair.io/resources/data-center-air-quality-monitoring/)

Data center air quality monitoring for operators: ISO 14644 cleanliness in the white space, construction dust, generator emissions, and perimeter noise.

### [Wildfire Smoke Air Quality Monitoring: Detection & Response](https://aethair.io/resources/wildfire-smoke-air-quality-monitoring/)

Wildfire smoke monitoring for EHS and public health teams: real-time PM2.5, the AQI 151 respirator trigger, and how to alert workers before smoke arrives.

### [Industrial Perimeter Air Quality Monitoring: Action Levels](https://aethair.io/resources/perimeter-air-quality-monitoring-guide/)

What industrial perimeter monitoring requires at fenceline and construction sites: DER-10 CAMP action levels, EPA fenceline rules, and continuous records.

### [Ozone Exposure Limits and Monitoring: OSHA and NAAQS](https://aethair.io/resources/ozone-monitoring-exposure-limits/)

OSHA's ozone PEL is 0.1 ppm as an 8-hour TWA. How NIOSH, ACGIH, and the 70 ppb NAAQS compare, and why ozone needs short-interval monitoring.

[All articles](https://aethair.io/resources/)

Questions

## Thiamis FAQ

What do I do on site to connect an instrument?

Connect the instrument to a port, power on the gateway, and set up the connected device in Environet. For any cataloged model, readings then stream to the Aethair Cloud over the built-in SIM and appear alongside the rest of your fleet. Sensors not yet supported can be integrated on request (see Compatible Sensors above). Your own team can do the installation, with no special license needed, or a partner from Aethair's network can do it for you.

How many instruments can one Thiamis connect?

Several at once. The RS-232 port is multiplexed: with the 3-to-1 expansion cable it takes three instruments, each with its own protocol and baud rate. RS-485 and SDI-12 are multi-drop buses, so several addressed instruments can share one port. The two USB-C ports take one instrument each. A perimeter kit commonly runs a dust monitor, a noise monitor, and a weather station on one gateway.

What power does Thiamis need?

12 VDC or USB-C, drawing about 4.6 W. Where there is no power outlet, it runs on a solar panel or an external battery. Outdoors, it sits in an Aethair Node, its field enclosure (specifications on request).

How is Thiamis bought?

The hardware is a one-time purchase: the gateway and its accessories. The platform is an annual subscription, on a one- to three-year contract, that covers every platform feature. Cellular data and data hosting are included, with no network fee. Buying starts with a 30-minute call: you tell us about your application, then we demo the solution for it.