Sensors

Industrial sensors on Voltkart: 24 inductive proximity sensors from ₹670, 6 photoelectric sensors and fibre-optic sensors from Omron and Autonics, plus PT100 and thermocouple temperature sensors. All prices include GST.

Inductive proximity sensors detect metal parts without contact; photoelectric sensors detect almost any object using a light beam. Both send an on/off signal to a PLC, counter or relay and are used on conveyors, packaging machines, presses and assembly lines. Prices checked 8 October 2026. Reviewed by Amit, Voltkart.

Inductive proximity sensors (live prices)

Sensing distances are nominal, on mild steel. Omron E2B: B1 = PNP, C1 = NPN, 2 m cable. Autonics PR: DN = NPN, DP = PNP, a trailing 2 = normally closed.

Photoelectric sensors

Fibre-optic sensors

A fibre amplifier with a separate fibre cable detects very small parts or works in tight spaces where a normal sensor will not fit.

Temperature sensors

For use with a temperature controller.

How to choose a sensor

• Target: metal parts → inductive proximity; plastic, cartons, bottles or people → photoelectric.
• Distance and size: M12 and M18 bodies are the most common; choose non-flush for more range if the mounting allows.
• Output: PNP or NPN to match the PLC input, and NO or NC for the logic you need.
• Supply: 12–24 V DC 3-wire for PLCs; AC 2-wire models can switch a relay or contactor coil directly.

Genuine Omron and Autonics sensors, GST invoice on every order. Related: digital counters, relay cards, 24 V DIN-rail SMPS.

Frequently asked questions

What is the difference between NPN and PNP proximity sensors?

A PNP sensor switches the positive supply to the output (sourcing); an NPN sensor switches the output to 0 V (sinking). Match it to the PLC input card: sinking inputs need PNP sensors, sourcing inputs need NPN sensors.

What does flush and non-flush mean?

A flush (shielded) sensor can be mounted level with the surrounding metal, but has a shorter sensing distance. A non-flush (unshielded) sensor needs a clear zone around the tip and senses roughly twice as far.

What is the sensing distance of an M12 or M18 proximity sensor?

Standard models sense 2 mm (flush) or 4 mm (non-flush) at M12, and 5 mm (flush) or 8 mm (non-flush) at M18, on mild steel. Long-range models such as the Omron E2B reach 4 mm (M12) and 8 mm (M18) even when mounted flush. Aluminium, brass and stainless steel targets are detected at a shorter distance.

Which photoelectric sensor type should I use?

Through-beam gives the longest range and most reliable detection but needs wiring on both sides. Retro-reflective needs a reflector opposite the sensor. Diffuse sensors detect the object itself, so they are the easiest to fit but have the shortest range.

Not sure which model you need? Send the part number or a photo of the old sensor on WhatsApp at 8800754881 (Mon–Sat, 12:30–7 pm).