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PCH 1270 and 1272 Compact Vibration Guards:
Simple SIL 2 Machine Protection with One 4-20 mA output 

Critical rotating machinery is often monitored by vibration sensors. The PCH 1270 and PCH 1272 vibration sensors are ideal as part of the safety chain for dangerous machinery when high accuracy and fast response times are important.

The PCH 1270 and 1272 Compact Vibration Guards compare the actual vibration levels to the internal thresholds 10 times per second, making it suitable for early warning or even for emergency shutdown of your machinery. Standard ISO 10816-3/20816-3 (2/10-1000 Hz) or customised filter ranges can be delivered.
 
PCH 1270 and 1272 comply with Functional Safety (EN13849), PL-d (SIL 2). Each calibrated Vibration Guard delivered by PCH Engineering comes with a test certificate. You can adjust the measuring range, vibration alarm levels, delay and hang times using switches on the monitor.
 

Main Features

  • Measuring parameter: velocity mm/s or acceleration m/s²
  • Frequency range: 10 to 1000 Hz or 1 to 30/300 Hz
  • 2 alarm levels with individual delay times and 2 alarm relays
  • Analog DC output RMS 4-20 mA, proportional to 0-100 %
  • Measuring range selectable: 10/20/50/100 mm/s or m/s² rms
  • Self-test function can be activated externally
  • Safety level SIL 2 rated, GOST-R certificate, ETL listed upon request
  • Only PCH 1272: RS-485 version for communication with PCH user software
     

Versions: with or without RS-485 communication

Unlike the standard PCH 1270 vibration sensor, the PCH 1272 has an RS-485 communication feature and can be programmed remotely using complementary PCH user software.
 

 

Applications

The PCH 1270 and 1272 vibration sensors can be used to monitor many different machines in a production environment. They are suitable for monitoring vibrations in rotating machinery such as:
  • ventilators
  • fans
  • pumps
  • decanters
  • separators
  • mills.
     

Functionality

The PCH Vibration Guard consists of a vibration sensor as well as circuitry for conditioning, alarms and output, all embedded in a stainless steel housing.

The current vibration level is continuously compared with the two alarm limits. If the alarm limits are exceeded, the two alarm relays A1/D1 will be triggered and inform the user, either via a connected rotor light, a beeper, controller or by directly shutting down the machine.

Both Alert (A1) and Danger (D1) have built-in delay times, which prevent false alarms due to momentary transients.

All monitors have built-in latch functions, ensuring the alarm relay stays triggered until it has been reset manually or remotely despite the vibration level decreasing.

A 4-20 mA signal is provided, which always expresses the vibration level. The 4-20 mA output can also be used to verify the alarm limits of the PCH Vibration Guard.
 

Options

Monitor acceleration or velocity

The series can be configured to measure velocity (mm/s) or acceleration (m/s2). Low frequency versions are available. Individual measuring parameters can be customised.
 

Filter ranges: 2/10-1000 Hz or customised

Depending on your machinery, standard ISO 10816-3/20816-3 (2/10-1000 Hz) or customised filter ranges can be delivered.
 

Compliance

PCH Vibration Guard monitors seismic mechanical vibrations according to DIN/ISO 10816-3/20816-3 as default.

PCH 1270 and 1272 comply with Functional Safety (EN13849), PL-d (SIL 2).

Each calibrated Vibration Guard delivered by PCH Engineering comes with a test certificate.
 


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