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Related Manuals for MMF KSI84 Series
Summary of Contents for MMF KSI84 Series
- Page 1 Instruction Manual 4-20 mA Vibration Sensor Type KSI84xx v1.32.034 Manfred Weber Metra Mess- und Frequenztechnik in Radebeul e.K. Meissner Str. 58 - D-01445 Radebeul Tel. +49-351 836 2191 Fax +49-351 836 2940 Email: Info@MMF.de Internet: www.MMF.de...
- Page 2 Metra Mess- und Frequenztechnik in Radebeul e.K. Meißner Str. 58 D-01445 Radebeul Tel. 0351-836 2191 0351-836 2940 Email Info@MMF.de Internet www.MMF.de Note: The latest version of this document can be found at: https://www.mmf.de/product_literature.htm All rights reserved, including those of translation.
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Page 3: Table Of Contents
Contents 1 Purpose .....................4 2 Function ....................4 3 Type Selection ..................5 3.1 Frequency Range (HP, LP) ..............5 3.2 Measuring Range ................6 3.3 Type Code ..................7 4 Sensor Operation ..................7 4.1 Sensor Mounting .................7 4.2 Sensor Connection ................8 4.2.1 Connection to the Loop Supply ..........8 4.2.2 Sensor Cable ................8 4.2.3 Grounding Concept ..............8 4.3 Measuring the sensor current .............9... -
Page 4: Purpose
Purpose The vibration sensors of the KSI84xx family are used to measure vibration acceleration, velocity or displacement on machines and objects. The sensors measure the vibration amplitude within a specified frequency range in axial sensor direction and outputs the measuring result as a 4-20 mA current loop signal. -
Page 5: Type Selection
Either the acceleration (without integrator), the velocity (integrator) or the displacement (double integrator) of the vibration can be measured. In addition, proper sensor function and input signal are monitored. Defects or overloads are signaled by an error current value. Before delivery, the sensor is parameterized according to the type code selected by the customer. -
Page 6: Measuring Range
The HP filter of the velocity sensor types has a stopband attenuation of -50 dB/decade, the LP filter has a stopband attenuation of - 40 dB/decade. Frequency response The HP filter of the displacement sensor types has a stopband attenuation of -60 dB/decade. -
Page 7: Type Code
3.3 Type Code The type code is printed on the sensor housing. It is composed according to the following key. Note that only integer values without decimal places are printed in the type code. KSI84QM-HHH-LLL-RRR Range in m/s² (1…3 places) Low-Pass filter in mm/s (2 places) -3dB cutoff frequency... -
Page 8: Sensor Connection
4.2 Sensor Connection 4.2.1 Connection to the Loop Supply The sensor is connected via PIN 2 (+) and PIN 3 (-) of the output connector to the loop supply voltage. PIN 1 and PIN 4 are not to be connected. View at sensor pins 1: Do not connect n.c. -
Page 9: Measuring The Sensor Current
Case 1: Sensor mounting on machine potential Sensor connection with type 080G/W, type Sensor connection with metal plug 082-B713G-PIG-x type 082-B713W-PIG-x: cable with moulded plug: Sensor connector electrically isolated Cable shield connected to threaded ring → connect shield to ground on device side →... -
Page 10: Maximum Load Resistance R
Voltage drop over R 125 Excitation 250 500 Sensor 4 mA 0,5 V 10 % 5,6 mA 0,7 V 1,4 V 2,8 V 20 % 7,2 mA 0,9 V 1,8 V 3,6 V 50 % 12,0 mA 1,5 V 100 % 20,0 mA 2,5 V... -
Page 11: Calculation Of Measured Quantity
(���� ���� − �� ����) ���� ���� �� �� ���������� ���������� The following table shows the sensitivity of the acceleration and velocity types for different measuring ranges. Range in m/s² KSI84Ax 0,32 0,16 0,08 0,032 mA/m/s² Range in mm/s KSI84Vx 12.7 25.4 50.8... -
Page 12: Linear Measuring Range
…x 4.5.4 Linear Measuring Range x The current loop sensor is calibrated at two vibration amplitudes to achieve optimum linearity of the sensor current over the entire measuring range. The range for valid measurements extends from … Sensor types 1 % of range (4.16 mA) All types except (2) 112.5 % of range KSI84AP-xx-10k-xxx... -
Page 13: Overload Display
For accelerometers, the dynamic range is independent of frequency. The sensor setting LP of the low-pass filter defines the corresponding range of values. For all velocity sensors, the dynamic range depends on the frequency. It is halved when the frequency doubles. The dynamic range of the displacement sensors depends strongly on the frequency. -
Page 14: Settling Time T
4.7.2 Settling Time T The averaging filter causes a signal delay. If the vibration signal changes abruptly, the sensor signal only changes smoothly. The signal change is not completed until the settling time T has elapsed. The table below shows the relationship between the number of averages N and the minimal settling time T. -
Page 15: Error Messages
4.9 Error Messages If the sensor current is between 4 mA and 22 mA , the sensor is in normal operational mode. Any current outside this range indicates a specific error. The following table shows the values used. Current Error Cause Remedy LOOP... -
Page 16: Technical Data
Technical Data 5.1 Technical Characteristics of the 4-20mA transducer Sensor system Piezoelectric accelerometer Measured quantity according to type code KSI84Ax-x-x-x Acceleration m/s² KSI84Vx-x-x-x Velocity mm/s KSI84D-x-x-x Displacement pk-pk Mode according to type code KSI84xR-x-x-x KSI84xP-x-x-x PEAK ... pk Linear frequency range according to type code High pass filter... -
Page 17: Environmental Characteristics
5.4 Environmental Characteristics Operating temperature -40 / 100 °C Protection grade IP68 Destruction shock limit 5000 EN 61326-2-3:2013 5.5 Type Tables 5.5.1 Acceleration, RMS Range Type code Noise m/s² m/s² KSI84AR-1-LP-5 0,005 KSI84AR-1-LP-10 0,005 KSI84AR-1-LP-20 0,005 KSI84AR-1-LP-50 0,007 KSI84AR-1-LP-100 0,007 KSI84AR-1-LP-200 0,008 KSI84AR-1-LP-500... -
Page 18: Acceleration, Peak
5.5.2 Acceleration, PEAK Range Type code Noise m/s² m/s² KSI84AP-1-LP-10 0.005 KSI84AP-1-LP-20 0.005 KSI84AP-1-LP-50 0.007 KSI84AP-1-LP-100 0.007 KSI84AP-1-LP-200 0.008 KSI84AP-1-LP-500 0.016 KSI84AP-1-5k-10 0.020 KSI84AP-1-5k-20 0.020 KSI84AP-1-5k-50 0.030 KSI84AP-1-5k-100 0.060 KSI84AP-1-5k-200 0.080 KSI84AP-1-5k-500 0.160 KSI84AP-1-10k-50 0.090 Peak KSI84AP-1-10k-100 0.180 KSI84AP-1-10k-200 0.200 KSI84AP-1-10k-500 0.250 KSI84AP-HP-LP-10... -
Page 19: Velocity, Peak
Velocity, RMS (continued) Range Type code Noise mm/s mm/s KSI84VR-10-LP-10 12,7 KSI84VR-10-LP-12 KSI84VR-10-LP-20 0,010 25,4 KSI84VR-10-LP-25 KSI84VR-10-LP-40 50,8 KSI84VR-10-LP-50 KSI84VR-30-LP-10 12,7 KSI84VR-30-LP-12 KSI84VR-30-LP-20 0,005 25,4 KSI84VR-30-LP-25 KSI84VR-30-LP-40 50,8 KSI84VR-30-LP-50 Complies with the requirements of ISO 2954 5.5.4 Velocity, PEAK Range Type code Noise mm/s... -
Page 20: Dimensions
5.6 Dimensions Measuring axis... -
Page 21: Limited Warranty
Limited Warranty Metra warrants for a period of 24 months that its products will be free from defects in material or workmanship and shall conform to the specifications current at the time of shipment. The warranty period starts with the date of invoice. The customer must provide the dated bill of sale as evidence.
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