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The IFS 203/4 slot sensor is an infrared photoelectric sensor manufactured by Electronic Switches India Pvt. Ltd.. It is designed with a fork-shaped body to detect objects by using a through-beam infrared light. Key specificationsAccording to product listings from Electronic Switches, the IFS 203/4 has the following features: 

• Type: Infrared (IR) slot sensor.
• Design: The IFS 203/4 is a PNP (Positive-Negative-Positive) output model. It is also offered as an IFS 203/4-TP variant, which is specifically for sensing transparent plastic.
• Slot dimensions: 20 mm wide by 45 mm deep.
• Housing: ABS plastic.
• Output: PNP with user-selectable Normally Open (NO) or Normally Closed (NC) contacts.
• Output current: 200 mA (maximum).
• Power supply: Operates on 10 to 30 Volts DC.
• Sensitivity: Includes sensitivity adjustment.
• Protection: Features short circuit and reverse polarity protection.
• Applications: It is used in industrial automation for tasks such as detecting small parts, labels, and print marks in machines, especially for transparent foils