Digital Illuminance Meter Module

Industrial gradeComponent grade

AC 220VTypical supply

4G/NBUplink port

Ex optionalEnclosure rating

Product overview and where it fits

The SimtoLink digital illuminance meter module is for environmental-sensing IoT. Measurement and communications sit on a 24-bit Σ-Δ ADC, so the reading stays predictable across a wide temperature, a wide supply, and electromagnetic noise. Illuminance, cosine correction, spectral mismatch, and the duty cycle of a flickering source all matter, so a job has to name the V(λ) match grade and the integration time. Terminals pull out, key chips have a watchdog and a redundant check, and signed firmware can roll back, so a volume shipment can still be maintained from afar.

The usual interfaces are a 4–20 mA loop, RS485/Modbus, and a cellular NB or 4G uplink, by order code, plus a local service port, so the module can meet SCADA, an energy system, or an IoT platform. SimtoLink supplies a southbound point list and northbound MQTT or HTTP push examples, which shortens the joint test. Volume jobs can add silkscreen, a set harness length, a protocol map, and a calibration certificate.

Reliability on site

For electrical safety and EMC, the module has passed the relevant salt-spray and vibration type tests. Ports include surge and reverse-polarity protection. Reinforced grounding and a partitioned layout reduce ground loops and common-mode noise. Outdoor or coastal sites can take a higher ingress rating and a corrosion-resistant coating.

Parameters can be loaded in batches, thresholds can be set, and the unit can keep event video or waveform records, depending on the model. Configuration and firmware go out by OTA. On site, close acceptance in three steps: a power-on self-test, clock sync on the link, and a spot check of samples. For metering or safety duty, SimtoLink helps submit the unit to a third-party metrology institute and supplies the type-test file.

Key hardware parameters

The figures below are the typical build of this module, for selection and for the technical clauses in a bid. A wider range, redundant power, or an intrinsically safe variant is available from SimtoLink with the Hardware Specification and the Installation and Commissioning Guide. Order codes in the family can differ slightly; the nameplate and the papers shipped with the unit govern.

Parameter	Specification	Notes
Sensing principle	Silicon photodiode + V(λ) match	Cosine correction, temperature-drift compensation
Range	0–200,000 lx (typical)	Low-light range can be specified
Resolution	1 lx (typical)	Digital output
Repeatability	±2% of reading (typical)	At constant temperature
Yearly stability	±2 %/year (typical)	Window cleaning and recalibration
Supply	AC 220 V (typical) / DC 12–24 V	By order code
Communication	4–20 mA / RS485 / NB-IoT / 4G	Isolation depends on the model
Response time	<1 s (typical)	Configurable integration time
Operating temperature	−20 to 60 °C (typical)	By order code
Explosion protection	Non-Ex (typical)	Ex build to the project

Typical deployments

Three ways this module usually lands in an IoT project, so a scheme can be designed and the payback judged:

Campuses and buildings

The module feeds campus energy management or building controls for sub-metering, alarms, and linked actions, so manual reads and inspection rounds cost less.

Plant and energy sites

On a line or in a power room it can meet MES or EMS and send key process values or energy data from the edge.

Municipal and utilities

Scattered points and outdoor cabinets. Wide temperature and lightning protection suit water, gas, and street lighting, where the link is long and the delay has to stay short.

Installation, grounding, and upkeep

Before applying power, confirm the supply range and polarity. If there is any doubt, measure bus voltage and breaker capacity with a multimeter.
Run the communications cable as shielded twisted pair, grounded at one end only, and do not lash it to high-power cables over a long route.
For the first go-live, prove read and write in both directions and the threshold triggers against the platform in the lab, then move the module to site.
Outdoors, give drainage and ventilation first priority, inspect the sealing faces on a regular round, and keep the lightning earth resistance inside the local code.
In continuous service, spot-check samples and archive logs every 6 months.

Ordering, documents, and support

SimtoLink provides the hardware specification, an outline drawing, a wiring table, and a sample project. Volume orders can include a sample review and inspection at the factory. Warranty and calibration follow the contract and the documents that ship with the module.

Where the reading is used

Illuminance feeds healthy lighting, exhibit protection, and grow-light strategy. The cases below differ in sensor height, cleaning, and how dimming is linked.

Primary and secondary classrooms

Average illuminance and uniformity on the desk are watched online, for education-equipment supervision and myopia-prevention pilots. Curtains, the luminaire DALI bus, and occupancy sensors hold a constant illuminance and a time-of-day energy schedule.

Museums and galleries

Illuminance on the object face and the yearly exposure stay inside conservation and display rules. A low-light range, temperature-drift compensation, and a hood-cleaning reminder keep exhibition data comparable across seasons.

Road and tunnel lighting

The portal luminance curve and mid-tunnel dimming follow traffic detection, which cuts glare and the black-hole effect. Ingress rating, a glare shield, and vibration isolation suit exhaust and piston wind.

Multi-layer plant factories

Layer-to-layer uniformity is spot-checked and hot spots are marked, then checked against a PAR quantum probe for the LED spectrum and drive current. Edge rules keep the photoperiod from disturbing a flowering-induction trial.