Aeron's Class A certified sensor lineup — the ALT-TH110 ambient sensor and Rigel 2 module temperature family — delivers high-fidelity thermal and humidity data compliant with IEC 61724-1:2021 for solar PV monitoring, agrivoltaic sites, and meteorological applications.
Product Intelligence Dashboard
Select a sensor to explore specs, features, and applications in detail
ALT-TH110
Air Temp & Humidity Sensor
Dual-Parameter Environmental Intelligence
RIGEL 2 MT-A420
Module Temp Sensor 4-20mA
Analog Precision for PV Thermal Tracking
RIGEL 2 MT-RTD1K
Module Temp Sensor PT1000
Resistive Output — Highest Resolution
RIGEL 2 MT-RS485
Module Temp Sensor RS485
Digital Modbus — Ready for Smart Grids
Performance at a Glance
Key metrics for ALT-TH110 — switch sensor above to compare
Performance Metrics
Output
RS485
RS485 MODBUS RTU
IP Rating
IP65
Ingress Protection
Resolution
0.01°C / 0.01% RH
Measurement fineness
Product Code
#52017
ALT-TH110
Supply Voltage
9V – 17V DC
Body: SS304/SS316
Compare All Sensor Variants
MT-A420, MT-RTD1K & MT-RS485 — every spec, side by side.
| Sensing Technology | |||
Sensor Type | PT1000 RTD Module | PT1000 RTD Module | PT1000 RTD Module |
Temp Range | -40°C to +150°C | -40°C to +150°C | -40°C to +150°C |
Sensor Element | RTD PT1000 Class A | RTD PT1000 Class A | RTD PT1000 Class A |
| Accuracy & Resolution | |||
Temp Accuracy IEC 60751 Class A — tightest standard for PT1000 | Class A ±(0.15 + 0.002|t|) | Class A ±(0.15 + 0.002|t|) | Class A ±(0.15 + 0.002|t|) |
Temp Uncertainty | ±0.3° | — | ±0.3° |
Temp Resolution MT-RTD1K: 10× finer resolution than siblings | 0.01°C | Best 0.001°C | 0.01°C |
| Output & Electrical | |||
Output Signal | 4–20 mA Current loop | PT1000 Resistive | RS485 Modbus RTU |
Supply Voltage MT-RTD1K: passive — no power supply needed | 12 / 24 V DC | Best Passive (none) | 12 / 24 V DC |
Multi-drop | — | — | Best Yes daisy-chain capable |
Current Draw | 0.5 mA | 0 mA (passive) | — |
| Physical & Ingress | |||
IP Rating | IP65 | IP65 | IP65 |
Operating Temp MT-A420 & MT-RTD1K: widest thermal range | Best -40°C to +150°C | -40°C to +150°C | -40°C to +80°C |
Body Material | Aluminium 6082 (anodized) | Aluminium 6082 (anodized) | Al 6082 / ABS hybrid |
Dimensions | Ø25.4 × 7.2 mm | Ø25.4 × 7.2 mm | Ø25.4 × 7.2 mm |
Weight | <15 gms | <15 gms | <20 gms |
Mount Style | Self-adhesive high-strength | Self-adhesive high-strength | Self-adhesive high-strength |
| Standards & Application | |||
IEC Standard | IEC 61724-1:2021 Class A | IEC 61724-1:2021 Class A | IEC 61724-1:2021 Class A |
Primary Use | PV Module Temp Solar plants | PV Module Temp Research grade | PV Module Temp Large SCADA |
Bifacial PV Ready | Yes | Yes | Yes |
SCADA / BMS | 4-20mA loop compatible | PT1000 DAQ compatible | RS485 Modbus compatible |
Cable Length | 2 meters | 2 meters | 2 meters |
Product Code | 55009 | 55006 | 55020 |
| Download datasheet | Datasheet ↓ | Datasheet ↓ | Datasheet ↓ |
Technology Deep Dive
The engineering behind Class A sensing
PT1000 RTD Sensing Element
Class A precision at every point
All Rigel 2 module temperature sensors are built around a Class A PT1000 resistance temperature detector. PT1000 offers 10× higher resistance than PT100, dramatically reducing the sensitivity to lead resistance — critical for long cable runs in large-scale solar plants. Class A tolerance ±(0.15 + 0.0020|t|) ensures accuracy is maintained from -40°C to +150°C without field recalibration.
Low-Profile Thermal Contact
Minimal shading — maximum accuracy
The Rigel 2 body is machined to Ø25.4 mm × 7.2 mm — one of the smallest footprints available for a calibrated module temperature sensor. The self-adhesive high-strength mount creates intimate thermal contact with the module back sheet, eliminating air gap errors. Low profile minimizes cell shading on bifacial modules where rear-side irradiance contributes up to 25% of energy yield.
Protocol Intelligence
Three output options, one platform
Aeron's Rigel 2 family offers three signal protocols — 4-20mA (noise-immune analog, ideal for legacy PLCs), PT1000 resistive (passive, highest resolution at 0.001°C for precision DAQ), and RS485 Modbus RTU (digital, multi-drop up to 32 nodes per bus, long cable runs). Choose the interface that matches your existing infrastructure without compromising sensor accuracy.
61724
IEC 61724-1:2021 — What Class A Means
IEC 61724-1:2021 is the international standard for photovoltaic system performance monitoring. Class A is the highest tier, demanding temperature measurement accuracy of ±(0.15 + 0.0020|t|) °C — where |t| is the absolute temperature value in °C. This tolerance ensures that module temperature data used in performance ratio calculations, energy yield reports, and bankability assessments meets the most stringent requirements accepted by independent engineers and financial institutions.
Built for Every Environment
From utility-scale solar farms to precision research laboratories
Module Temperature Monitoring
Utility-Scale Solar PV
Monitor back-of-module temperatures across string zones to calculate Performance Ratio, validate thermal limits, and feed IEC-compliant yield reports for utility-scale solar assets.
Recommended
Meteorological Mast Sensing
Solar Weather Stations
Precision ambient temperature and humidity sensing for IEC 61724-1:2021 compliant solar weather monitoring stations — feeding irradiance and environmental data to cloud analytics.
Recommended
Dual Land-Use Monitoring
Agrivoltaic Installations
Dual-purpose sensing for agrivoltaic installations — module temperature monitoring for PV yield alongside ambient T+RH for crop microclimate management.
Recommended
Process & Building Automation
Industrial SCADA / BMS
RS485 Modbus RTU and 4-20mA outputs enable plug-and-play integration with industrial SCADA, DCS, PLC, and Building Management Systems.
Recommended
Vehicle & Warehouse Monitoring
Cold Chain Logistics
Continuous temperature and humidity monitoring across refrigerated vehicles and warehouses — reliable data logging with RS485 Modbus RTU output for compliance reporting.
Recommended
High-Precision Thermal Analysis
Research & Testing Labs
The MT-RTD1K's 0.001°C resolution makes it ideal for academic research, module certification testing, and precision thermal characterisation work.
Recommended
Seamless System Compatibility
All sensors in the Aeron weather sensor lineup use industry-standard communication protocols — RS485 Modbus RTU and 4-20mA — ensuring plug-and-play compatibility with the widest possible range of data acquisition and monitoring infrastructure.
Aeron ACE Data Loggers
XTREME XG920/XG930 · DLG80 — native compatibility, IEC Class A end-to-end
SCADA / DCS Systems
Modbus RTU protocol supported by all major SCADA platforms including Ignition, WinCC, InTouch
PLC / RTU Controllers
4-20mA analog loop and RS485 ports available on virtually all industrial controllers
Building Management Systems
Direct BMS integration for HVAC temperature and humidity monitoring via RS485 Modbus
Data Acquisition Systems
PT1000 RTD inputs available on precision DAQ cards from NI, Yokogawa, Hioki, and more
Frequently
Asked
Questions
Everything you need to know about Aeron's weather sensor and module temperature sensor lineup.
IEC 61724-1:2021 defines performance criteria for solar photovoltaic system monitoring. Class A is the highest tier — it mandates the strictest measurement accuracy for module temperature, irradiance, and meteorological parameters. Sensors meeting Class A accuracy ±(0.15 + 0.0020|t|) ensure bankable yield data and are accepted by independent engineers for financial reporting.
MT-A420 (4-20mA) suits legacy SCADA/PLC systems that accept standard analog current loops. MT-RTD1K (PT1000 resistive) is best when your data logger has a dedicated RTD input and you need the finest resolution (0.001°C) for research-grade accuracy. MT-RS485 (Modbus RTU) is ideal for modern digital networks, large-scale plants requiring multi-drop daisy chains, and systems already using RS485 communication.
Yes. The Rigel 2 series has a low-profile design (Ø25.4 mm × 7.2 mm) specifically engineered to minimize cell shading on bifacial modules. The self-adhesive high-strength mounting ensures secure attachment to module back sheets without mechanical fasteners or additional hardware.
The ALT-TH110 uses a stainless steel SS304/SS316 sintered porous filter housing that provides IP65 protection while maintaining excellent airflow to the sensing element. Its combined simultaneous T+RH measurement, RS485 Modbus RTU output, and IEC 61724-1:2021 Class A accuracy tolerance make it purpose-built for solar weather monitoring stations rather than general HVAC use.
Standard cable length is 2 meters. For RS485 variants (MT-RS485), cable runs can be extended significantly — the RS485 protocol supports runs up to several hundred metres with appropriate cable selection. For 4-20mA variants (MT-A420), the current loop can also support long cable runs without signal degradation. Contact our engineering team for specific extended-length requirements.
Yes. MT-A420 uses the industry-standard 4-20mA current loop accepted by virtually all PLCs, DAQ systems, and SCADA platforms. MT-RS485 and ALT-TH110 use Modbus RTU over RS485, supported by Ignition, WinCC, InTouch, Siemens, and all major industrial control systems. MT-RTD1K outputs a direct PT1000 resistance signal readable by any precision DAQ card with RTD inputs.
MT-A420 and MT-RTD1K are rated for -40°C to +150°C — matching the full thermal range of modern PV modules in both arctic and desert deployments. MT-RS485 is rated -40°C to +80°C (due to the ABS enclosure addition for the RS485 electronics). ALT-TH110 covers -40°C to 125°C for ambient air sensing.
Each Aeron sensor ships with a factory calibration certificate traceable to national standards. This documentation is required for IEC 61724-1:2021 Class A system verification and is accepted by independent engineers in yield assessment and lender reports. Recalibration intervals depend on application requirements — typically 1–2 years for bankable solar monitoring.