Panel Indicators, Pilot Lights

Part Number	Description / PDF	Quantity
5593001023F Dialight	LED PMI SNAP-IN RED/GRN PVC FREE	684
5591301003F Dialight	LED PANEL GRN DIFF 1.8V SNAP 6"L	1063
6792315343F Dialight	LED PANEL INDCATOR ORANGE 24V	39
80110300334504 Dialight	PMI ASSY PRESS TO TEST BLU 15/32	1
6561358304F Dialight	LED PNL IND OR 37.5V IP67/NEMA4X	0
6561304303F Dialight	LED 1/2" FLAT YLW 24VDC LEAD	5
367843009503 Dialight	IND PMI SUB MINI BASE	9
6563106304F Dialight	LED 1/2" DOME RED 28VDC TERM	7
5580803023F Dialight	LED PMI SNAP-IN BLUE PVC FREE	737
5580501023F Dialight	LED PMI SNAP-IN GREEN PVC FREE	0
6221104304F Dialight	22MM FLTPMI RED 3VDC W/TERM	109
655-1105-104F Dialight	1/2"FLTSNAP RD120VAC W/TERMS	250
6563308303F Dialight	1/2" DOM YL 37.5VDC W/LEAD	64
6572902103F Dialight	LED 17.46MM ORANGE DIFF PNL MNT	0
50747573731500F Dialight	LED PANEL IND 5V 15MA RED	51
6563407304F Dialight	1/2" DOM BL 72VDC W/TERM	50
6561408303F Dialight	1/2" FLT BL 37.5VDC W/LEAD	48
6571503303F Dialight	LED 17.46MM RED DIFF PANEL MOUNT	68
5580302023F Dialight	LED PMI SNAP-IN YELLOW PVC FREE	315
6563203304F Dialight	LED 1/2" DOME GRN 12VDC TERM	49

Panel Indicators, Pilot Lights

1. Overview

Panel indicators and pilot lights are optoelectronic devices that provide visual status feedback in electrical and electronic systems. These components convert electrical signals into light outputs, enabling operators to monitor equipment conditions at a glance. Their importance spans across industrial automation, consumer electronics, transportation, and medical devices, where reliable visual indication ensures operational safety, efficiency, and user interaction.

2. Major Types and Functional Classification

Type	Functional Features	Application Examples
LED Panel Indicators	Low power consumption, long lifespan, instant response	Industrial control panels, HVAC systems
Lamp-based Pilot Lights	High brightness, compatibility with AC/DC circuits	Machinery status indication, heavy-duty equipment
Combined Indicator/Switch	Integrated illumination with manual control	Emergency stop circuits, control desks
Multi-color Indicators	Programmable color outputs for status differentiation	Network routers, medical diagnostic equipment
Remote Indicators	Separate light source and panel module	Automotive dashboards, aerospace control systems

3. Structure and Components

Typical construction includes:

Light Source: LED chips or filament bulbs with specific color/wavelength
Housing: Thermoplastic or metal body with mounting threads (e.g., M20, NPT)
Optical System: Diffused or focused lens for uniform light distribution
Electrical Interface: Screw terminals, PCB pins, or quick-connect terminals
Sealing Elements: Rubber gaskets for IP65+ protection ratings

4. Key Technical Specifications

Parameter	Significance
Operating Voltage Range	Determines compatibility with control circuits (3-480V AC/DC)
Luminous Intensity (cd)	Affects visibility in different lighting conditions
Color Wavelength (nm)	Standardizes visual coding (e.g., 630nm red for warnings)
MTBF (Hours)	Indicates reliability (LED: 50,000-100,000 hours)
IP Rating	Defines environmental protection level
Response Time (ms)	Critical for real-time status monitoring

5. Application Areas

Industrial: CNC machines, PLC control cabinets, factory automation
Transportation: Locomotive control panels, aircraft avionics
Medical: Patient monitors, imaging equipment status indicators
Consumer: Home appliance power indicators, audio equipment
Energy: Solar inverters, smart grid monitoring systems

6. Leading Manufacturers and Products

Manufacturer	Representative Product	Key Features
Phoenix Contact	ILLINOX series	Modular design, IP69K rating
Omron	XLDC12E-4AH	Ultra-compact LED indicator with 100,000-hour lifespan
Siemens	8WA1000 series	Multi-voltage capability (24-415V AC/DC)
Eaton	Pilot Lights H45K	Shock-resistant filament lamps for heavy-duty use
TE Connectivity	CapLED	Capacitive touch-enabled indicator

7. Selection Recommendations

Key considerations:

Environmental factors: Temperature range (-40 C to +85 C), vibration levels
Electrical compatibility: Voltage matching and circuit type (AC/DC)
Visibility requirements: Ambient light conditions and viewing distance
Certification needs: UL, CE, RoHS compliance for regulatory environments
Mechanical specifications: Panel cutout size (commonly 16/22/30mm)

Example: Selecting an IP67-rated LED indicator with 24V DC operation for a food processing plant's washdown area.

Industry Trends

Emerging developments include:

Integration with IoT systems for smart status monitoring
Miniaturization for high-density panel designs
RGB-LED technology for dynamic color coding
Energy harvesting indicators for self-powered operation
Enhanced durability coatings for extreme environments