Vibration Transducer 4-138
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4-138 Applications • Industrial Turbines • Turbine-Driven Machinery • Power Generators • Gas Pumping Systems Features • Friction-free design for long life • Self-generated, high level, low impedance output • Operates to +700°F Description The friction-free moving elements in CEC’s 4-138 Vibration Transducers assure long life and reliability. Designed for industrial applications on fixed turbines, you can use this instrument in turbine hot sections where high temperatures cause problems with other transducers. The system is simplified due to the low impedence, high level output that can drive AC meters, recorders, and control electronics without using special amplifiers. The frictionless design also allows measurement of extremely low vibration levels, critical when monitoring precision balanced turbine systems. The low level is limited only by system noise. The 4-138 is a seismic mass type velocity transducer designed for measuring vertical vibrations at low frequencies and high temperatures up to +700°F (+371°C). The output signal results from relative movement between the internal coil and magnet when the case vibrates. This magnetic damped system operates above its natural frequency. The selfgenerated sensor output is proportional to velocity. CEC Vibration Products • 746 Arrow Grand Circle • Covina, California 91722 • USA (626) 938-0200 • (800) 468-1345 • Fax: (626) 938-0202 www.cecvp.com ISO 9001:2000 AS9100 Certified Velocity Sensors Vibration Transducer

4-138 Vibration Transducer Performance Specifications Ordering Information Sensitivity: When ordering, specify Type 4-138-XXXX (See Table below). In keeping with CEC’s policy of continuing product improvement, specifications may be changed without notice. (ref. Table 1) measured at 80 Hz and +77°F (+25°C) ±4% at 1.0 in/sec (ips) peak, load impedance is 100,000 Ω ±2% Dynamic Range Frequency: 15 Hz to 2000 Hz Amplitude: 0.07 inch peak-to-peak, maximum Acceleration: 0.02 g to 50 g Acceleration Threshold: 0.01 g peak Linearity: ±3% along straight line between 0.1 & 1.0 ips peak at 80 Hz & 77°F...