In most jurisdictions, you need two RTE devices if the door is an egress door.
Why? If smoke from a fire obscures a PIR, how do you unlock it?
This scenario is why 2 forms of RTE are required by IBC. Here's the code below:
1008.1.4.4 Access-Controlled Egress Doors
- A sensor must be mounted on the egress side to detect an occupant approaching the doors. Doors must unlock upon a signal from the sensor or loss of power to the sensor.
- A manual unlocking device (push button) shall result in direct interruption of power to the lock – independent of the access control system electronics. When the push button is actuated, the doors must remain unlocked for 30 seconds minimum. The push button must include signage stating “Push to Exit” and must be located 40” to 48” vertically above the floor and within 5’ of the doors. Ready access must be provided to the push button.
You might get away with only a pushbutton in some jurisdictions, but never just a PIR. Too risky. The PIR is there for convenience during normal operation, so the door 'automatically' unlocks without requiring people to push a button first.