Add to Cart Compare Quick view Epson A2140859 PIS Sensor (Photo Ink Sensor) for WorkForce, Expression XP and More MSRP: Now: $29.99 Was: What is PIS sensor and what does a PIS sensor do? PIS Sensor. Some people call it "Photo Ink Sensor". It is an analog proximity sensor that measures the reflection of infrared from objects. According to Kevin, Epson's A2140859 sensor... MSRP: Now: $29.99 Was: Add to Cart Compare Quick view Qty in Cart: 0 Quantity: Decrease Quantity: Increase Quantity: Price: MSRP: Now: $29.99 Was: Subtotal: Add to Cart