Profile: Thunderbird International Corp. is a manufacturer of magnetic speed sensors, hall effect gear tooth and hall effect magnetic sensors. We are an ISO 9001:2000 certified company. We provide magnetic speed and hall effect sensors. Our magnetic speed sensors contain VR, intrinsically safe, active magnetic, RF pickups, intrinsically safe RD pick ups an digital RF pickups sensors. Our hall effect sensors includes hall gear tooth, magnetic hall, zero speed, quadrature, hall directional and intrinsically safe sensors. Our variable reluctance speed sensors are found in high pressure installations. The signal output of a VR speed sensor is caused by the excitation of its inductive coil by a passing target. The ferrous actuator, such as a wheel gear or a turbine blade, moves past the sensor, the break in the actuator surface excites a voltage in the VR coil, producing an electrical analog wave. The frequency and voltage of the analog signal is proportional to actuators velocity. The passing discontinuity in the target causes the VR sensor to generate a pulse. The cyclical pulse train created by a vehicle rotating gear, a flow meters turbine blade or a cotter key slot can be read by counters, meters or governing instrumentation. Our hall effect quadrature sensor detects the rotational or linear direction that a magnetic target is traveling. Our hall effect magnetic sensor can detect the motion of magnets passing across the sensor face, approaching and receding from the sensor and magnets mounted on rotating shaft hall effect sensors are used as vehicle speed sensors, wheel speed sensors and ABS brake systems.