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PCH 1420 Vibration Monitor:
A 4-Channel SIL 2 Monitoring System

PCH 1420 vibration monitor - iot-enabled
The PCH 1420 vibration monitor gives you thorough insights into the condition of your machinery, allowing you to prevent serious machine damage and costly production stops.

This vibration monitor is the sensible choice when you wish to combine machine protection with the condition monitoring of roller bearings.

The PCH 1420 is a volatile 4-channel vibration and process system for the permanent monitoring of vibrations and process parameters in rotating machinery.

Easily integrate the monitor with your DCS, SCADA system or PLC through hardwired 4-20 mA signals, alarm relays or various interfaces like Modbus TCP/RTU, ProfiNet, OPC UA or IIoT (REST).


Only pay for the vibration monitoring solution you need

There is no sense in investing in a complex vibration monitoring system if you only need a few of its functions. That is why we have made the PCH 1420 Vibration Monitor part of the modular PCH 1420 Link Concept.

With the Link Concept, you can add additional monitoring modules as your need for more sensors grows. In other words, you only pay for what you require here and now.




SIL 2 Rated Vibration Monitor

The PCH 1420 vibration monitor is SIL 2 rated and can form part of a SIL 2 safety chain as well as a Condition Monitoring System (CMS).


ISO 10816/20816 Compliant Monitor

With the PCH 1420's standard setup, which is ISO 10816/20816 compliant, you can detect early bearing faults while monitoring the severity of unbalance and misalignment in your machinery.

The PCH 1420 offers both broadband high frequency monitoring, Envelope, Kurtosis and Crest factor for bearing fault detection.

All the detectors run simultaneously and are based on inputs from up to 4 measuring points in real time. Each bearing fault detector can measure the various fault indicators throughout the lifetime of the bearing.


PCH 1420 with Enhanced Alarm Functions

PCH 1420 includes an integrated alarm, which alerts the user when an alarm limit has been exceeded through a connected rotor light, a beeper, a control system, or by directly shutting down the machine.

The alarm functions can also be configured as needed.


Where to Get Your PCH 1420 Vibration Monitor

If you are situated in Denmark and Scandinavia, contact our headquarters in the Copenhagen region.


We also work closely with local distributors all over the world.


PCH 1420 Specifications

PCH 1420 Vibration Monitor features

  • 4 vibration input channels
  • 2 process input channels
  • 4 configurable outputs, relay or 4-20 mA/0-2.4/5/10 V
  • Redundant SIL 2 Safety Relay
  • User defined bandpass filters from 0.7 Hz up to 11,500 Hz
  • Bearing fault detectors: Envelope, Crest and Kurtosis
  • Adjustable alarm levels and delay times
  • Time waveform recordings of vibration sequences from 4 channels simultaneously
  • Offline FFT analysis
  • Connection to several accessory boxes on bus system
  • USB/RS 485 serial connection
  • ModBus TCP via the PCH EtherBridge; Profinet is optional
  • Safety level SIL 2 rated and GOST-R certified


4-Channel Vibration Monitor Ready for IIoT

If you are looking for a vibration monitor for a cloud setup, this 4-channel monitor offers a broad range of data, making it a valuable addition to your IIoT / Industry 4.0 environment.

You can use the PCH 1420 vibration monitor as a stand-alone solution or connect it to your SCADA or PLC system.

The PCH 1420 vibration monitor has 4 input channels. This means that one PCH 1420 can be delivered for various types of vibration sensors, including:
  • IEPE Piezo or 3-wire API 678 accelerometer (negative voltage)
  • API 670 proximity probes (negative voltage)
  • True Velocity sensors (moving coil technology) ±10V
  • PCH Low Frequency MEMS accelerometers
  • DC signals like 4-20 mA or 0-2.4/5/10V for process
The input channels are factory configured and calibrated prior to delivery. Gain factors are automatically configured with no user action required.


2 Process Channels

The vibration monitor has 2 embedded process channels. The process channels are updated simultaneously with the 4 vibration input channels.

Speed sensor input:

  • Configurable speed measurements based on an NPN/PNP sensor or through an AC signal 0-30V (>10V)
  • Number of pulses per rotation are user configurable, up to 5000 per second
  • Full scale range RPM is user configurable
  • Missing pulses can be detected and activate an alarm
  • Can be delivered for a proximity probe (Keyphasor) signal as speed input.

Analogue input:

  • Offers either a 4-20 mA or a 0-2.4/6/12/24 VDC input signal
  • Configurable Full Scale and measuring units
  • NAMUR NE43 monitoring for missing input signal
  • Can be delivered for a proximity probe for axial displacement measurements (GAP)


5 Embedded Outputs for Optimal Safety

The vibration monitor has five embedded outputs. Measuring values and alarms can be directed to the four digital outputs. They can be user configured as:
  • 0/4-20 mA or 0/2-10 V outputs
  • NPN relay driver for a separate relay
  • Digital Input directly to a PLC.
The fifth output, a redundant mechanical failure relay, will open in the event of missing sensors, sensors being out of range, short-circuits or general monitor errors. This relay can also be configured for vibration and process alarms.


EN/ISO 13849-1 Functional Safety

The standard PCH 1420 supports Functional Safety requirements according to ISO 13849-1. The PCH 1420 monitor meets the Performance Level d (PLd) and can be used in a SIL 2 measuring chain.

The monitor design features a redundant isolated system failure relay, which you can use for trip alarms from all measuring bands configured with individual trip alarms.

You can also activate a self-test procedure through a digital input or through user software for testing the monitor and the outputs. This ensures a highly reliable data output and reduces the test cycle duration.


Individual Setup Options

You can use the monitor’s standard setup out of the box. Or, if you wish, you can easily adapt the setup to your specific requirements using the PCH Vibration Studio software (comes complementary with the monitor).

We offer several versions and configurations to provide you with a suitable solution for your specific application.

Read more about PCH Vibration Studio here.


Individual Setup of Channels, Accelerometers/Velocity Sensors

All measuring- and process channels can be individually configured by the user. For a typical accelerometer vibration input channel, you can configure:
  • 2 active measuring bands per accelerometer
  • Filter ranges from 0.7 to 11500 Hz
  • Measuring units: Acceleration, Velocity or Displacement
  • Detector as true RMS with adjustable averaging time, Peak and Peak-to-Peak. You can freely adjust the Peak detector with Attack and Decay times.
  • 2 alarms per measuring band: Alert (pre-warning) and Danger (trip) alarms can individually be configured incl. delay times of up to 100 seconds.
If you need several measuring bands and fewer accelerometers, more channels can be connected to the same accelerometer. This setup is useful for monitoring individual gear mesh frequencies (GMF).


Individual setup of channels, proximity probes (eddy current):

Up to 4 factory configured, negative input channels (-24V) can be individually configured by the user. Various sensitivities are supported:
  • Filter ranges from 0.7 to 11,500 Hz
  • Measuring units Displacement as mils, µm or mm
  • Detector as true RMS with adjustable averaging time, Peak and Peak-to-Peak. You can freely adjust the Peak detector by Attack and Decay times
  • 2 alarms configurable: Alert (pre-warning) and Danger (trip) alarms can be individually configured incl. delay times of up to 100 seconds
  • DC monitoring / GAP monitoring for actual position of the probe tip
  • 4 alarms configurable for GAP monitoring
  • The individual probe sensitivity as well as the linear range can be user configured

Configurable Alarm Settings

Alert (pre-warning) and Danger (trip) alarms can be configured for each measuring band and process input.

The Danger alarms can be guided to the mechanical SIL 2 relay for a single signal in the event of high vibration levels or to the digital outputs if configured as a relay.

Optionally, a PCH Relay Box can be added for up to 12 extra mechanical relay outputs.

Read more under PCH Link Concept.

All alarms can be latched for a manual reset and, if not in use, the alarms can be held (Alarm Hold), allowing the controller time to react (0-100 s in 0.1 s steps).

You can configure the alarm as either High Level Alarms or Low Level Alarms (the alarm will alert you if vibrations higher than X and/or lower than Y are measured).


Inhibit Functions for NO-TRIP due to Resonances

If you know that resonances occur in your machine at a certain stage during Run-Up and Coast-Down, you can inhibit the alarms, either through a digital input signal or by using one of the process inputs.

For instance, if you know your machine will resonate and create strong vibrations during run-up, you can inhibit the alarms within that specific rotating speed, e.g. 500-700 rpm or higher for a turbine.

You can freely configure the inhibit window using the complementary software, PCH Vibration Studio.


Interfaces for Configuration and Measurements

PCH 1420 comes with the complementary user software PCH Vibration Studio, which offers online trending, simultaneous recording of 4-time waveform signals (raw data) and an FFT tool for diagnostics and analysis.

The software is user-friendly, and you can connect a USB cable or a permanent RS-485 wire for remote access.
You access the PCH 1420 easily through the embedded USB 2.0 connector on the front. The monitor settings are imported to your PC from where you can alter them.

The PCH 1420 also offers an RS485 2-wire connection for long distances and can be daisy-chained into a network of monitors.

The RS485 connection is used for the PCH Vibration Studio software and for the optional PCH EtherBridge LAN/TCP module (remote access). A switch on the front of the PCH 1420 activates an internal 120 Ohms resistor in order to terminate the RS485 network.


The Front of the PCH 1420 Vibration Monitor

LEDs clearly show the status of the four measuring channels while a Status LED indicates general errors or failure conditions.

In the event of vibration alarms, the affected channel will turn Yellow or Red indicating Alert or Danger levels, respectively.

In the event of a sensor error or an overload, the individual LED for the affected channel will flash red, and the Status LED will turn permanently red as well.

Alarms or input errors from the process inputs will turn the Status LED red.


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