Product Overview and Engineering Role
The SimtoLink infrared surface temperature sensor measures by non-contact infrared radiation. The reading is the equivalent radiative temperature of the surface in the field of view. The path is a MEMS thermopile or a similar infrared detector, not a platinum PT100, an armored rod, or a stick-on contact probe. Set emissivity (ε) for the material and the surface, and judge the field of view, the distance, absorption in the atmospheric window, and radiation reflected from the surroundings. Where it helps, compare it with a contact thermometer in a steady state before using it for hot-spot rounds or canopy temperature. The hardware stays predictable across wide temperature, wide supply voltage, and EMI. Terminals are pluggable, the critical chips have a watchdog and a redundancy check, and signed firmware can roll back, which suits volume delivery and remote maintenance.
The default interface is isolated RS485 plus a standard industrial connector, so the sensor can join an existing SCADA, energy-management, or IoT platform. SimtoLink supplies a southbound point-list template and northbound MQTT/HTTP push examples, which shortens joint commissioning. Volume projects can add an enclosure legend, harness length, protocol mapping, and a calibration certificate.
Reliability and Site Conditions
On electrical safety and EMC, this sensor has cleared the relevant IEC 61000-4 level-4 items. Ports include surge and reverse-polarity protection. Reinforced grounding and a partitioned layout hold down ground loops and common-mode interference. Outdoor or coastal sites can take a higher ingress rating and a corrosion-resistant coating.
Parameters load in bulk, threshold policies can be set, and event video or waveforms can be kept, depending on the model. Configuration and firmware go out by OTA. Before sign-off, run a power-on self-test, sync time on the link, and spot-check a sample. For metering or safety use, SimtoLink helps submit the unit to a third-party metrology institute and provides the type-test documents.
Key Hardware Parameters
These figures are the typical build of this sensor, for selection and for a technical clause in a tender. For a wider range, redundant power, or an intrinsically safe explosion-proof variant, ask SimtoLink for the Hardware Specification and the Installation and Commissioning Guide. Order codes in the same family can differ slightly; the nameplate and the papers shipped with the sensor govern.
| Parameter | Specification | Remarks |
|---|---|---|
| Sensing principle | Non-contact infrared radiation (typical 8–14 μm atmospheric window) | Not an RTD or thermocouple contact sensor |
| Target Temperature Range | According to Order Number (e.g., the medium to low temperature range can cover -40 to +500 ℃) | Customizable Range and Optical Components |
| Accuracy | ±(reading % + fixed ℃) or equivalent index | Depending on range, calibration, and emissivity settings |
| Emissivity compensation | Ε 0.10~1.00 adjustable (register/menu) | Incorrect settings will cause systematic errors |
| Field of view / Distance | Orderable optics (D:S matched with spot diameter for installation) | The spot should fall within the measured surface |
| Power supply | DC 5–36V wide voltage | Isolated type |
| Communication interface | RS485 Modbus RTU | Some models offer Ethernet / Redundancy options |
| Protection level | IP67 | Outdoor model optional IP67 |
| Operating power consumption | <0.39 W | Typical values |
| Response Time | Typically hundreds of milliseconds to a few seconds (including digital filtering) | Trade-off between fast response and noise |
| Long-term drift | According to the model specification (lens contamination can amplify drift) | It is recommended to regularly wipe the window and perform random inspections |
Typical Deployments
Three ways this sensor shows up in an IoT project, for scheme design and for judging payback:
Plants and energy sites
On a line or in a power room, the sensor talks to MES or EMS and uploads process values or energy use from the edge.
Municipal utilities
Scattered points and outdoor cabinets. The hardware takes wide temperature and surge protection, for long runs and low-latency watching of water, gas, and street lighting.
Campuses and buildings
The sensor joins the campus energy system or the building controls for sub-metering, alarms, and linked actions, which cuts manual meter reads and inspection rounds.
Installation, Grounding, and Maintenance
- Check the supply range and polarity before you apply power. Where the bus is shared, confirm voltage and breaker rating with a multimeter.
- Use shielded twisted pair, ground the shield at one end, and do not lay it for a long distance with high-power cables. Keep the field of view clear, the window clean, and the emissivity matched to the material.
- Before the first site cutover, prove bidirectional read and write and a threshold trip against the platform in the lab.
- Outdoors, leave a path for drainage and for air, inspect the gasket faces on a round, and keep the lightning earth resistance inside the local limit.
- While the sensor stays in service, spot-check a sample and archive the logs every 6 months.
Ordering, Documentation, and Support
SimtoLink ships a hardware specification, an outline drawing, a wiring table, and a sample project with the sensor. Volume orders can include a sample review and an inspection at the factory. Warranty and calibration follow the contract and the papers that travel with the unit.
Where it is used
Infrared surface temperature suits a moving or live target when contact is not possible, and it often sits beside a thermal camera in predictive maintenance and precision agriculture. The cases below turn on distance, the emissivity library, and how the data is combined.
Switchgear and busbar hot spots
The sensor is aimed at the critical joints and the disconnect contacts. The trend goes into predictive maintenance and the asset system. With ultrasonic partial discharge, an infrared window, and a robot round, the inspection stays live and a defect work order goes out on its own.
Rolling and continuous-casting rolls
A fast array or a spot scan on a hot moving surface picks up steel sticking, a cooling fault, and the start of roll-surface spalling. A protective window, purge air, and a maintained quartz optic keep mill-scale dust from reading as a false low.
Crop canopy and soil evaporation
A drone gimbal or a fixed field pole takes canopy temperature for an irrigation prescription and a water-stress index. With station VPD, net radiation, and a soil tensiometer, evapotranspiration is easier to read and the precision-agriculture model holds up better.
Cold-store doors and conveyors
An aged door seal shows up as a cold bridge, and belt friction shows up as a temperature rise, before frost, slip, and a jump in energy use. Lens heat and a dry air curtain in the cold stop condensation from being read as a real change. The data joins the WMS and cold-chain traceability.
Further Reading
Pages on this site for selecting the sensor, for the network protocols, and for putting it in:
- Sensor-module integration and protection >
- 4–20 mA loop and safety barrier
- Modbus registers and point lists >
- EMC and grounding on an industrial site
- A consultation and a sample unit
- Smart manufacturing and factory digitization >