Automatic doors, gates, and material-handling lines put the same question in front of you: does your machine-safety sensor need to guard an opening, or measure what passes through it? The EMX Industries Thru-Beam Photometer Sensor IRB-MON 2 photo eye and the Rotary Encoder Digital Meter Counter with Wheel & Mounting Bracket answer that question in very different ways. On a powered door or gate, the sensor has to watch across the opening and signal the operator to stop before someone gets trapped. On a roll line, the sensor has to track distance as material moves. Those jobs lead to different hardware, and the decision comes down to the safety or measuring outcome you actually need.
Quick Verdict
- Choose the EMX IRB-MON 2 photo eye if your priority is entrapment protection for a door, gate, or barrier. It carries the $45.00 listed price and comes as a thru-beam photoeye kit with transmitter, receiver, integrated protective hoods, and a removable lens sunshield.
- Choose the 300ppr Rotary Encoder Digital Meter Counter with Wheel & Mounting Bracket if your priority is roll-length measurement or rotation counting with stop/start control. It carries the $86.20 listed price and packages a digital meter, rotary encoder, wheel, and mounting bracket.
At a Glance Comparison
| Decision point | EMX IRB-MON 2 photo eye | Rotary encoder counter |
|---|---|---|
| Listed price | USD 45.00 | USD 86.20 |
| Price bar | ||
| Primary job | Thru-beam entrapment protection for doors, gates, and barriers | Roll-length measurement with rotary encoder, wheel, and bracket |
| Output/control | UL325-compliant monitored beam for monitored operators | Early-warning setting with relay output to stop or start equipment |
Where Each Product Wins
- The EMX Industries Thru-Beam Photometer Sensor IRB-MON 2 photo eye wins when an automatic door or gate must detect a person or object in the opening. Its thru-beam design is the safety fit, and the transmitter/receiver setup is ready to work with a monitored operator.
- The Rotary Encoder Digital Meter Counter with Wheel & Mounting Bracket wins when the job is length measurement or rotation counting. The wheel gives you direct travel feedback, and the relay output turns that measurement into machine control.
Product Notes
EMX Industries Thru-Beam Photometer Sensor IRB-MON 2 photo eye
Start with the job you are protecting. The EMX Industries Thru-Beam Photometer Sensor IRB-MON 2 photo eye is built around an infrared beam for powered doors, gates, and barriers. Its weather-proof IP65-rated enclosure is suitable for indoor and outdoor use, and the kit includes a transmitter, receiver, integrated protective hoods, and a removable lens sunshield. The unit is also compatible with most non-monitored legacy products, so it can work with an existing operator even if that operator is not monitored. Its construction is intended to minimize fogging and false triggering, which makes alignment easier and reduces nuisance signals. The limitation is scope: this is an entrapment-protection photoeye, not a measuring counter. If the task is roll-length totals or rotation counts, this photoeye will not do that job.
300ppr Rotary Encoder Digital Meter Counter with Wheel & Mounting Bracket
This package solves a different problem. The 300ppr Rotary Encoder Digital Meter Counter with Wheel & Mounting Bracket brings together a digital electronic meter, a rotary encoder, a wheel, and a mounting bracket for roll-length measuring and testing. Each wheel revolution is captured by the encoder, and you can set an early-warning value; when that value is reached, the controller can make equipment stop or start. The 110-220V US plug fits shop-floor or testing setups. The unit's stable performance, reliable quality, and durable material are practical strengths when the wheel is running against moving material. The limitation is equally clear: this is a measuring-and-control device, not a thru-beam photoeye. It will not provide entrapment protection for an automatic door or gate, so the safety application belongs to the EMX sensor.
Final Choice by Use Case
- Choose the EMX Industries Thru-Beam Photometer Sensor IRB-MON 2 photo eye for automatic doors, gates, and barriers where entrapment protection is the goal. The thru-beam kit is the safety-oriented match for that opening.
- Choose the Rotary Encoder Digital Meter Counter with Wheel & Mounting Bracket for roll-length measurement, rotation counting, and stop/start control based on an early-warning value. The complete package is the measuring-oriented match for that production job.
