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PCB 649A71 Knock Sensor Transmitter - "Intelligent" Electronic Knock Sensor Data Processor Transmitter for Piston Machines Protection

PCB 649A71 Knock Sensor Transmitter - The PCB 649A71 series piston machine protection knock sensor transmitter provides more secure data acquisition and preliminary data processing with integrated microprocessor data processing for more reliable condition monitoring and protection of piston machines.

Piston machines can develop certain faults quite rapidly, which can lead to further serious damage. To prevent malfunctions, mechanical or, ideally, electronic vibration switches are commonly used, mostly on the equipment's crankcase. Traditional vibration switches, vibration sensors, and processing methods are not suitable for monitoring elements of piston machines such as the connecting rod, crosshead, piston rod, and valves subjected to strong impact loads due to their physical limitations. The PCB 649A71 series piston machine protection transmitter provides more secure data acquisition and preliminary data processing with integrated microprocessor data processing for more reliable condition monitoring and protection of piston machines. The operation of various elements of piston equipment and their faults are related to impact-type vibration phenomena. These impacts generally have very high amplitudes but very narrow widths. Traditional vibration sensors can easily be driven into resonance or saturation by these impulses, giving false alarms, while mechanical switches can be triggered by lower frequency vibrations sooner. Therefore, a different sensor, signal content, and more effective processing are required for proper evaluation compared to the usual rotating machinery analysis. The PCB 649A71 series sensors were designed according to these criteria to provide protection for piston equipment. For more information on the use and configuration of the 649A71 series piston machine protection transmitter, please request our detailed technical guide! Features

standard 4...20 mA interface for PLC, DCS, ... systems
built-in piezoelectric vibration acceleration sensor
integrated microprocessor data processing
parameterizable processing and output modes: - output proportional to scalable peak value - output proportional to the number of scalable peaks - output proportional to scalable peak value and exceedance
standard supply voltage, minimal power consumption
robust, industrial housing
interchangeable with vibration sensors
MIL-C-5015 connector or assembled (PVC/armored) cable
simple configuration via USB connection
easy installation, cost-effective design

Variants

649A01 MIL-C-5015, 2-pin connector
649A11 equipped with cable
649A61 reinforced (armored) cable
649A62 high-temperature, reinforced (armored) cable
EP649A71 explosion-proof housing, with screw wiring
EX649A71 spark-proof version, with screw wiring

Technical Specifications

Built-in sensor: Measurement range: Sampling length: Weighting factors: Knock lower/upper threshold: Supply voltage: Output resistance: Output: Temperature range:Housing: Connector / design:Size:

piezoelectric vibration acceleration sensor 2.5 ... 80 Hz (150 ... 4800 ¹/_min) for machines 0.2 ... 6.4 s 0.1 ... 20 mA2 ... 50 g (649A62: 8 ... 200 g) 15 ... 30 VDC 50 ohm 4-20 mA; A: (+), B (-) - 40°C ... 100°C - 40°C ... 260°C (649A62) stainless steel, welded as above; MIL-C-5015, 2-pin, or with assembled cable (PVC or steel armored) ~ Ø34 x 71 mm, 148 grams

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PCB 649A71 Knock Sensor Transmitter

PCB 649A71 Knock Sensor Transmitter

PCB 649A71 Knock Sensor Transmitter - "Intelligent" Electronic Knock Sensor Data Processor Transmitter for Piston Machines Protection

PCB 649A71 Knock Sensor Transmitter