Product Application Guide- Transducers- External Drive- Piezo Part Numbering System Transducer Series (PT / AST) Part Number Structure PT 1224 P E-05 Q - MX Series PT = Piezoelectric Transducer Unique Identifier Drive Type & Termination FP = Feedback Design & PC Pins P = External Drive & PC Pins FW = Feedback Design & Wires W = External Drive & Wires Special Designator RoHS: Q = RoHS Compliant Connector: Molex Microfit 3.0 Connector on Wire Models Note: To Connect to this Connector, Use Mating Molex P/N 43020-0201 Part Number Structure AST 605 TR Q Series: AST = Surface Mount Unique Identifier Termination: TR = Tape-N-Reel RoHS: Q = RoHS Compliant Page 2 Piezoelectric Electronic Alarm Construction The above cross section picture shows the basic elements used in a piezoelectric audible alarm. The area in front of the transducer element including the front hole opening forms an acoustic cavity that lets the sound radiate out with the most efficiency (i.e. loudest sound level). If the alarm is an indicator that contains a circuit board, the circuit board is attached to the piezoelectric sounder element via soldered wires. The above picture can be interpreted to represent a board mount package with pc pin terminations, but the same concept is used when building audible alarms in other mounting configurations such as SMT, Flange Mount, and Panel Mount alarms. If the back of the alarm is sealed with epoxy or other material, the guts of the alarm (including the circuit board and components) are protected against fluid intrusion. However, fluid sitting inside the front cavity can obstruct the operation of the device causing the sound level to decrease significantly. If you need to wash the alarms after a soldering operation, it is strongly recommended to use an alarm that comes with a wash label that keeps the washing fluid from getting inside of the front cavity.