Optical Counting Sensor for Pharmaceutical Tablet Counting

Product Specifications

Technical details and manufacturing context for Optical Counting Sensor

Definition

The Optical Counting Sensor is a component used in pharmaceutical tablet counting and bottling machines. It employs light-based detection to identify and count individual tablets as they pass through the counting mechanism, ensuring precise dosage and packaging compliance. The sensor emits a light beam, typically infrared or laser, across the tablet path. When a tablet interrupts the beam, a signal change is detected and processed to increment the count. Advanced versions may use imaging or multiple beams for higher accuracy and to distinguish tablets from debris. The sensor is housed in a stainless steel 304 enclosure, corrosion-resistant for washdown, and features optical-grade glass or plastic lenses. It operates on a 24 V DC supply (reverse polarity protected) with a current consumption of 50–100 mA without load. The output type is selectable via wiring as NPN or PNP. Response time is 0.1–1 ms, and counting speed ranges from 1000 to 2000 tablets per minute. Detection accuracy is ±0.05% under normal conditions. Operating temperature range is -10 to 50 °C, storage temperature -20 to 70 °C, and protection class is IP65–IP67 per IEC 60529. Connection is via a 4-pin M12 quick-disconnect connector. Weight is 150–200 g without cable. These values are directory reference ranges; verify model-specific specifications with the legal manufacturer or supplier before procurement. The sensor is designed for integration into automated pharmaceutical packaging lines, where reliable counting is critical for regulatory compliance. It is not a standalone device but a component that requires proper installation, alignment, and calibration. Maintenance signals include erratic counts or failure to detect, which may indicate lens contamination, misalignment, or electronic issues. The sensor is not intended for use in explosive atmospheres or with corrosive chemicals beyond typical washdown. Always consult the manufacturer's documentation for detailed installation and troubleshooting guidance.

Working Principle

The sensor emits a light beam (typically infrared or laser) across the tablet path. When a tablet interrupts this beam, it creates a detectable signal change. The sensor's electronics process these interruptions to count each tablet. Advanced versions may use imaging or multiple beams for higher accuracy and to distinguish between tablets and debris.

Common Materials

Optical-grade glass or plastic lenses, Stainless steel housing, Electronic circuit board with photodetectors

Technical Parameters

Parameter	Typical range	Notes & selection driver
Counting Speed	1000–2000 tablets/min	Maximum speed for reliable counting
Detection Accuracy	±0.05 %	Accuracy of count under normal conditions
Supply Voltage	24 ±10% V DC	Reverse polarity protected
Current Consumption	50–100 mA	Without load
Output Type	NPN/PNP	Selectable via wiring
Response Time	0.1–1 ms	Time to output signal after detection
Operating Temperature	-10–50 °C	Outside range may affect accuracy
Storage Temperature	-20–70 °C	Non-condensing environment
Protection Class	IP65–IP67	Dust-tight and protected against water jetsIEC 60529
Housing Material	Stainless steel 304	Corrosion-resistant for washdownASTM A240
Connection Type	M12 connector	4-pin, quick disconnect
Weight	150–200 g	Without cable

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Light Source Part
Emits the optical beam used for tablet detection

Material: LED or laser diode
Photodetector
Detects changes in light intensity when tablets interrupt the beam

Material: Semiconductor sensor
Optical Lens Part
Focuses and directs the light beam for precise detection

Material: Optical-grade glass
Signal Processor
Converts optical signals into digital count data

Material: Electronic circuit board with microcontroller

Manufacturers of Optical Counting Sensor

Manufacturer profiles associated with Optical Counting Sensor.

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Frequently Asked Questions

What is the typical counting speed of this sensor?

The directory lists a counting speed range of 1000–2000 tablets per minute. However, the actual maximum speed depends on the specific model and application conditions. Always verify with the manufacturer's datasheet.

What output types are available?

The output type is selectable via wiring as NPN or PNP. This allows integration with different control systems. Confirm the correct wiring configuration with the supplier.

What is the protection class of the sensor?

The protection class is IP65–IP67 per IEC 60529, meaning it is dust-tight and protected against water jets. This is suitable for washdown environments, but verify the exact rating for your model.

How should I verify the sensor's accuracy?

The detection accuracy is listed as ±0.05% under normal conditions. To ensure accuracy, perform regular calibration and maintenance as recommended by the manufacturer. Also, verify that the operating temperature and other environmental conditions are within specified ranges.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Atmospheric to 1.5 bar (21.8 psi)
other spec:	Tablet size: 2-25 mm diameter, Max counting speed: 5000 tablets/min, Light source: 650 nm red LED, IP rating: IP65
temperature:	-10°C to +50°C (operating), -20°C to +70°C (storage)

Optical Counting Sensor

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