Short Summary: Smidnya IL22 pilot lights are panel-mounted visual signalling devices used to indicate machine status, power condition, warning states, and process events. This guide explains the complete IL22 family from an engineering and application standpoint so customers can choose the right product faster and support teams can answer common questions with less back-and-forth.
A pilot light, also called an indicator lamp or panel indicator, is a visual signalling component installed on a control panel, machine front plate, enclosure door, or operator station. Its job is to convert an electrical state into a clear visual message for the operator.
Typical uses include:
In practical panel design, pilot lights are among the simplest components on the panel, but they have a major effect on usability, troubleshooting speed, and operator confidence.
The Smidnya IL22 series is the standardized panel-indication family aligned to the source AD22 catalog grouping. Across the family, the source range includes protected LED pilot lights, dome styles, metal pilot lights, dual-colour types, and compact digital display variants in multiple mounting formats and voltages. That means IL22 is not just one light — it is a panel-indication platform used across machine and automation applications.
A pilot light works by converting electrical input into visible output. In modern LED pilot lights, the internal light source is an LED rather than a filament or neon-only structure. When the rated voltage is applied, the internal circuit drives the LED and the coloured lens becomes visible from the front face of the panel.
In practical terms, the operating chain is:
On a real industrial machine, pilot lights reduce uncertainty. A technician approaching a panel can immediately understand whether control power is available, whether the machine is running, whether a permissive is active, or whether a fault condition exists. Good indication design reduces troubleshooting time, lowers operator error, and improves service response.
The IL22 family includes common industrial mounting sizes such as 16mm, 22mm, and 30mm for standard protected families, along with smaller compact metal pilot-light formats. In most industrial panels, 22mm is the most widely recognized general-purpose format because it balances visibility, standardization, and panel drilling convenience.
| Mount Size | Typical Use |
|---|---|
| 16mm | Compact control panels and space-limited assemblies |
| 22mm | Standard industrial control panels and automation cabinets |
| 30mm | Larger visual presence and heavy-duty style layouts |
Customers often assume that a pilot light is universal. It is not. The selected voltage must match the actual circuit it will be connected to. In control panels, common indication voltages may include AC, DC, and AC/DC combinations depending on design practice.
Wrong voltage selection can lead to:
When selecting a Smidnya IL22 pilot light, always start with the real control-circuit voltage, not the assumed machine mains voltage.
Colour is not decoration. In industrial panels, colour is a communication system. A well-designed panel keeps colour meaning consistent across the full machine or line.
| Colour | Typical Meaning |
|---|---|
| Red | Fault, stop, trip, emergency condition |
| Green | Run, healthy state, normal condition |
| Yellow | Warning, caution, abnormal but not stop-critical |
| Blue | Special function, auxiliary state, process-specific logic |
| White | Power available, neutral indication, general status |
Keeping colour logic consistent reduces mistakes during operation and service.
| Issue | Likely Cause | Corrective Action |
|---|---|---|
| No light | No supply, wrong voltage, wiring error | Verify supply and part selection |
| Dim light | Voltage mismatch or unsuitable model | Check actual circuit voltage |
| Wrong indication logic | Colour assignment mismatch | Review panel indication standard |
| Loose fit | Incorrect cutout size | Reconfirm mount dimension |
Which IL22 size is most common?
22mm is typically the most common general industrial size.
Can I use one pilot light for every voltage?
No. Always match the selected model to the actual circuit voltage.
When should I use metal body instead of standard protected?
When the panel needs stronger mechanical feel, compact metal formats, or a more rugged front build.
When should I use digital pilot lights?
When the customer wants a compact display-based indication point rather than a simple ON/OFF visual signal.
Need the right panel indicator for your machine, retrofit, or control cabinet? Explore the Smidnya IL22 range on Smidmart and compare protected, dome, metal, and digital pilot-light formats by application.