IRD8800 - API 670 Compliant Vibration and Condition Monitoring System

Made in India, Made for the World, IRD8800 is a Series of Vibration and Condition Monitoring System which is API 670 Compliant and is used to Monitor and Protect Critical Assets of a Plant such as Motors, Pumps, Fans, Turbines, Compressors, etc. 

Salient Features

  • Rack-Based 5U High. Available in Racks of Varying widths from 1 Slot to 8 Slots
  • Microprocessor Based and User Programmable via Push Buttons for Full Scale Range, Sensitivity, Alarm, Trip and Several other parameters
  • Alphanumeric Display of Instantaneous value along with configurable Bar Graph Display
  • Hot-Swappable Modules compliant to API 670. System can accept Two Independent Power Supplies thereby providing Redundancy in Power Supply
  • Industry Standard Outputs - 4-20 mA, Redundant MODBUS RTU/TCP-IP, Alarm and Trip Relay Contacts, Buffered Time Waveform via BNC

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General Specifications of IRD8800 Series Signal Modules


Measurement units, ranges, warning (alarm), trip levels, sensor sensitivity, band pass filters etc can be set from the password protected front keypad at any time. For a Customer convenience, specified units and ranges will be factory set at time of order. 


The front panel has 100 segment Dual Bar Graph and two rows of 16 character Digital displays. Signals are displayed as a percentage of the Full Scale Range of the Bar Graph, as well as the Warning (Alarm) and Trip values, when selected. This user-friendly feature enables Operators to view the relationship in terms of percentage (%) between the measured value and the warning or trip settings. Actual signal levels in native units are also shown on the Digital Display along with sensor bias/gap voltage and speed (with a tacho signal) by selection. 


  • DCS – The system provides industry standard isolated 4-20mA DC signal output per channel for interfacing with Distributed Control System (DCS) as well as RS485/MODBUS connectivity as standard.

  • SCADA - The RS232 output is available as an option to SCADA systems.

  • Multi-Channel Simultaneous Diagnostics - Taking you Further, BNC connectors are also at the rear back plane of each module for providing buffered Time Wave Form (TWF) signals to any on-line multi-channel simultaneous or scanning diagnostics system. This offers comprehensive turbine diagnostics, applying the Dual Redundancy Parallel Processing (DRPP) architecture that provides greater system reliability.

  • Analyzer Outputs – Where applicable, three BNC connectors, one for each channel and the third for tacho/phase reference are located on the front panel for use with a portable dual channel FFT vibration analyzer. Shaft phase measurement is available when a Tacho Module is installed. The same vibration BNC signal sockets are repeated at the rear of the rack. 

Independent Warning (Alarm) Relay

The Warning (Alarm) Relay operates when an alarm occurs in any module. One change-over (SPDT) potential free contact rated at 5A resistive @ 230V AC is provided. Normally de-energized (non fail-safe), or field changeable to normally energize (fail-safe). Reset is manual and is actuated only when the signal level goes below the pre-set alarm level. 

Independent Trip Relay

The Trip Relay operates when trip occurs in any module. Two change-over (DPDT) potential free contacts rated at 5A resistive @ 230V AC are provided. Normally de-energized (non fail-safe), or field changeable to normally energize (fail safe). Reset is manual and is actuated only when the signal level goes below the pre-set trip level. 

Common TX Fail Relay

The TX Fail Relay operates when any transducer failure (change in bias voltage) is detected; it is displayed by a flashing bar graph on the front panel of the module. One change-over (DPDT) potential free contact rated at 8A @ 230V AC or 24 V DC is provided. Normally de-energized (non fail-safe), Reset is automatic when fault condition returns to normal. Alarm and Trip relays are deactivated and also the 4-20mA DC output is pulled below 4mA to 2.8mA in TX Fail condition. 

Start-up Protection

Start-up control bus deactivates Alarm and Trip relays and also pulls 4-20mA DC output below 4mA indicating invalid signal to the DCS. 

Power Supplies

90 – 270V AC, 50/60Hz, single phase, 30VA per module.
The Redundant Power Supply can be either 230V AC or 110V AC or +48V DC or +110V DC or +220V DC. 


Each vibration module is calibrated to National Standards via the IRD Mechanalysis state-of-the-art full frequency digital calibration system with an international traceable certification that is always valid. 


Barrier terminal strips are provided for all external wiring. Conduit entry holes are available at the bottom of the Main Rack Frame. 

Type Tests

The following primary Type Tests have been passed and will remain current:

  • Dry Heat Cyclic, IS:9000 P-III

  • Damp Heat Cyclic, IS: 9000 P-V

  • Bump IEC 68-2, Vibration IEC 68-2, Humidity IEC 68-2

  • Mark, European Union – IEC61326 EMI/EMC and IEC61010 Safety 


  • Storage temp: -18°C to 70°C

  • Operating temp: 0°C to 65°C ambient

  • Humidity: 95% non condensing 

Available Modules and Compatible Inputs

IRD8800 is a Rack Based Monitoring System. The Rack slots can be filled with Hot-Swappable Modules which can be wired to different types of Input Sensors to perform different types of Measurements.

The Table below summarises the module options available and the compatible input sensors for the modules

ModuleMeasurement FunctionInput SensorNo. of Channels Measured Units Data Sheet
 M88200Casing Vibration - It is a measurement of the Absolute Vibration of the Bearing Casing; Keyphasor - It acts as the phase reference point in Vibration AnalysisAccelerometer/Velometer for Vibration; Eddy Current Probe for Keyphasor 2 for Vibration; 1 for Keyphasor g Pk, g RMS

m/s/s Pk, m/s/s RMS mm/s Pk, mm/s RMS
i/s Pk, i/s RMS
microns Pk-Pk, mils Pk-Pk

Data Sheet of M88200-DC
 M88210Relative Shaft Vibration - It is a measurement of the Shaft Vibration Relative to the Bearing; Keyphasor - It acts as the phase reference point in Vibration AnalysisEddy Current Probes for Vibration and Keyphasor 2 for Vibration; 1 for Keyphasor Microns Pk-Pk
M88250Casing Vibration - It is a measurement of the Absolute Vibration of the Bearing Casing; Keyphasor - It acts as the phase reference point in Vibration AnalysisInductive Velocity for Vibration 2 for Vibration; 1 for Keyphasormm/s Pk, mm/s RMS, i/s Pk, i/s RMS, microns Pk-Pk
M88280Generator End Winding Vibration - It is a measurement of the Absolute Vibration of the Stator End Winding within a GeneratorCharge Amplifier with an input from high temperature charge output accelerometers2 for VibrationLF1 (50/60Hz), LF2(100/120Hz) mm/s Pk, mm/s RMS, i/s Pk, i/s RMS microns Pk-Pk, mils Pk-Pk 

Absolute Vibration (Stator End Winding Monitoring)

 VibroFibre™ FBG, Fiber Optic  2 for Vibration

microns Pk-Pk

 M88300 Axial Shift

Eddy Current Probe

 2 for Axial Shift

+/- mm, +/- mils


 Cam ValveRotary Potentiometer2%, Deg, mm, inch
M88500Differential Expansion*Eddy Current Probe2+/- mm, +/- mils
M88600EccentricityEddy Current Probe2microns pk-pk, mils pk-pk
M88700Other Parameters (Pressure, PF, Load, etc)4-20 mA DC2User Defined
M88750Vibration and TemperatureIRD544M Velocity Input & RTD 3-Wire Input2

mm/s Pk, i/s Pk, microns P-P , mils Pk-Pk Deg C or Deg F

M88800Shell ExpansionLVDT2mm, inch
M88900Speed Monitor**ECP - User Defined2RPM
M88925Reverse RotationDual ECP Input Sensors1Direction by LEDs
M88950TemperatureRTD (3 Wire)4Deg C or Deg F

Information available on MODBUS Output

The Redundant MODBUS RTU/TCP-IP Output available per Rack on the Rack Backplane provides the following information for integration in DCS/PLC/SCADA:

  • Trip Level Setting
  • Trip Hysterisys count
  • Trip Fail Safe Logic setting
  • Trip Relay Latch setting
  • Trip Turn ON Delay time
  • Process Value
  • Alarm Level Setting
  • Alarm Hysterisys count
  • Alarm Fail Safe Logic setting
  • Alarm Relay Latch setting
  • Alarm Turn ON Delay time
  • Gap Voltage
  • Full Scale Range
  • Sensitivity Unit
  • Sensitivity Setting
  • Display Unit
  • Low Pass Filter Selection
  • Relay Status
  • High Pass Filter Selection
  • Noise
  • Tx Fail Low Level Setting
  • Tx Fail High Level Setting
  • Startup Delay Time
  • Process Status

Please feel free to reach out to our Sales Team with any questions that you may have about the System and we shall be happy to answer the same. You can send us your requirements for this system using the adjacent Email Button

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