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PC420V series

Product catalog summary

Specifications:
The PC420V series sensors provide a 4-20 mA output proportional to velocity vibration. A 4 mA output indicates no vibration, while 20 mA indicates maximum vibration. The full-scale output is 20 mA with a tolerance of ±5%. Frequency response ranges from 10 Hz to 1 kHz with ±10% accuracy and 3.5 Hz to 2 kHz with ±3 dB accuracy. Repeatability is ±2%, and maximum transverse sensitivity is 5%.

Electrical Requirements:
The sensors require a 2-wire loop power with a voltage range of >12 VDC to 30 VDC max. The maximum loop resistance at 24 VDC is 700 Ω. Turn-on time for the 4-20 mA loop is 30 seconds. The case is isolated and internally shielded for grounding.

Environmental Specifications:
Operating temperature ranges from -40 to 105°C. The vibration limit is 250 g peak, and the shock limit is 2,500 g peak. The sensors are hermetically sealed.

Physical Characteristics:
The sensing element design is PZT, shear, with a weight of 160 g. The case material is stainless steel, and the mounting is a 1/4-28 tapped hole. The output connector is a 2-pin, MIL-C-5015 style, with a recommended cabling of J9T2A.

Features and Benefits:
The sensors offer true RMS or calculated peak output, corrosion resistance, hermetic sealing, ESD protection, overload protection, and reverse wiring protection. They allow for continuous monitoring of machine vibration, aiding in maintenance prioritization and early failure detection.

Model Selection:
The PC420Vx-yy model numbers indicate output type and full-scale range. Options include RMS or peak output with velocity ranges from 0.5 ips to 5.0 ips.

Connection Details:
Function connections include ground (shell), loop positive (+) on pin A, and loop negative (-) on pin B. Maximum loop resistance can be calculated using the formula: (VDC power – 10 V) / 20 mA.

Catalog excerpts

Wilcoxon Research PC420V series RMS and peak velocity Loop Powered Sensors (LPS™) Output, 4-20 mA Full scale, 20 mA, ± 5% �� Frequency response: ± 10% �� ± 3 dB �� Repeatability �� Transverse sensitivity, max. �� True RMS or calculated peak output Corrosion resistant Hermetic seal ESD protection Overload protection Reverse wiring protection • Choice of output: RMS or peak, permits you to choose the sensor that best fits your industrial requirements • Provides continuous trending of overall machine vibration • Can help guide maintenance in prioritizing need for service • Helps notify of impending equipment failure The 4-20 mA output of the PC420V series is proportional to velocity vibration. An output of 4 mA indicates a level of 0 ips or no vibration present. A full-scale reading of 20 mA indicates that the maximum range (RMS or peak) of vibration is present. Power requirements (2 wire loop power): Voltage at PC420 series sensor terminals �� >12 VDC, 30 VDC max Loop resistance at 24 VDC, maximum �� 700 Ω Turn on time, 4-20 mA loop �� 30 seconds Grounding �� case isolated, internally shielded Operating temperature range1 �� –40 to 105° C Vibration limit �� 250 g peak � Shock limit �� 2,500 g peak Sealing �� hermet

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Table 1: PC420Vx-yy model number selection x (4-20 mA output type) P = Calculated peak output, velocity Typical circuit Pin A, 4-20 plus Pin B, 4-20 minus RL Signal measuring equipment PLC / DCS Meggitt Sensing Systems 20511 Seneca Meadows Parkway Germantown MD 20876 USA Tel: 301 330 8811 Fax: 301 330 8873 Email: [email protected] www.wilcoxon.com www.meggitt.com

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