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PREDICTIVE MAINTENANCE CONTROLS

VIBRATION SWITCHES

PLATE MOUNTED

438A Vibration Switches, Plate Mounted

FULL FUNCTION, SWITCH-SELECTABLE VIBRATION MONITOR

The 438A Electronic Vibration Switch is an economical approach to accurate and reliable vibration protection for rotating machinery. Designed primarily for the OEM market but of equal value to end users, this device is a full-function vibration monitor that can be bolted directly to a machine. The rugged cast aluminum enclosure houses an accelerometer sensing element and the hardware required to qualify it as a true vibration monitor. Standard features include alarm and trip shutdown relays and signal outputs for local or remote metering purposes, and a NEMA 4 cast aluminum enclosure. An optional explosion-proof housing can be specified for use in hazardous areas.

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Measurement mode

Velocity

Frequency range

3 – 1000 Hz

Analog output

4 – 20 mA DC, proportional to full scale range

Input power

120/220V AC field-selectable or 24V DC (please specify when ordering)

Setpoints

2, field adjustable from 0-100% of full scale

Relay outputs

120/220V AC units: Solid-state triac, 10A max., 50mA min.

24V DC units: Solid-state transistor, 1A max.

Operating temperature

-25 to 160F (-32 to 71C)

Enclosure

NEMA 4 or Explosion-proof (Class I, Groups C & D; Class II,  Groups E, F & G)(please specify when ordering)

Environmental rating

NEMA 4 – weatherproof

Weight

NEMA 4: 5 lbs (2.3kg)

Explosion-proof: 7.6 lbs (3.4kg)

Mounting

NEMA 4: Flat surface, 4″ x 8″ (10.2 x 20.3cm)

Explosion-proof: Flat surface, 4.5″ x 9.25″ (11.4 x 23.5cm)

Conduit Entry

3/4 NPT

 

 

Optional accessories

 

 

Enclosure-mounted reset switch, P/N 53263-108

 

Remote meter in NEMA 4X Enclosure, 0-1 in/sec, P/N 79986-39A

 

Remote meter in NEMA 4X Enclosure, 0-3 in/sec, P/N 79986-39E

Full scale range

0 – 1 in/sec or 0 – 3 in/sec

Alarm setpoint

0 to 100% of full scale range

Trip setpoint

0 to 100% of full scale range

Relay time delay

0 to 20 sec. per relay

Relay state

Normally de-energized (open below setpoint) or normally energized (closed below setpoint)

Relay configuration

Latching or non-latching

Relay inhibit

Inhibits relay operation during start-up or
machine maintenance

AC signal output

100 mV/g or 100 mV/in/sec

Ball Mills
Centrifuges
Coilers
Compressors
Conveyors
Cooling lowers
Fans
General Purpose Rotating Machinery
Generators
Grinders
Hammer Mills
Mixers
Motors
Pumps
Rolling Mills

  • Helps eliminate catastrophic equipment failures
  • Should your equipment vibration level increase, the 438A gives you notification, and can also shut down the equipment before major damage occurs.
  • Allows you to plan repairs in advance
  • Trending the vibration level enables you to detect changes in vibration, which allows you to schedule repairs coinciding with your normal maintenance schedule.
  • Compatible with predictive maintenance programs
  • The 438A is compatible with most data collectors, analyzers and online analysis systems. Analyzing the vibration signatures allows you to find specific causes of high vibration such as imbalance, misalignment and bent shafts as well as faulty belts, bearings and gears.
  • Eliminates false alarms
  • The 438A replaces mechanical vibration switches that can give false alarms or trips at machine startup, or when transient vibrations from external sources occur.
  • The 438A is designed to be field-configured to fit a wide variety of applications. When ordering the 438A you only need to specify the type of enclosure and the power input required.
  • Dual vibration level setpoints
  • Alarm and shutdown (“Trip”) contact closures are supplied, which activate when specified vibration levels are reached or exceeded.
  • Analog output
  • The 438A has a 4-20 mA DC analog output proportional to the full scale range, typically connected to a PLC, DCS or chart recorder.
  • AC signal output
  • An AC signal output, field selectable for 100 mV/g or 100 mV/in/sec, is standard. This output is available on a terminal block for connection to a customer-supplied remote connector.
  • Time delays and inhibit functions
  • Each relay has an adjustable time delay ranging from 0 to 20 seconds. An inhibit function is also included, which can be used to disable relay operation during start-up transients or machine maintenance.
  • Multiple configurations
  • The 438A comes in three different enclosure types: NEMA 4, NEMA 4X or explosion proof. It is also available with either AC (selectable 120/220) or DC (24V) input power.

STUD MOUNTED

480 Vibration Switches, Stud MountedRELIABLE, LOW-COST MACHINERY PROTECTIONThe 480 is a compact Vibration Switch which combines the functions of a Vibration Transducer, Transmitter and Monitor. It provides low-cost protection of rotating machinery by signaling users when excessive vibration levels exist, indicating developing machinery problems. Ideal for motors, fans, cooling towers and a wide range of general-purpose rotating machinery and processing equipment.
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Measurement mode

Velocity

Frequency range

5 – 1,000 Hz

Analog output

4 – 20 mA DC, proportional to full scale range

Input power

120/220V AC field-selectable or 24V DC (please specify when ordering)

Setpoints

2, field-adjustable from 0 – 100% full scale

Operating temperature

-25 to 160F (-32 to 71C)

Enclosure

Explosion-proof/weather-proof aluminum alloy

Environmental rating

NEMA 4

Weight

120/220V AC units: 2.4 lbs (1.1 kg)

24V DC units: 2.2 lbs (0.9 kg)

Mounting

3/4-10 stud

Conduit entry

3/4 NPT

Full scale range

0 – 1in/sec or 0 – 3 in/sec

Alarm setpoint

0 – 100% of full scale range

Trip setpoint

0 – 100% of full scale range

Relay time delay

0 to 20 sec. per relay

Relay state

Normally de-energized (open below setpoint) or normally energized (closed below setpoint)

Relay configuration

Latching or non-latching

Relay inhibit

Inhibits relay operation during start-up or
machine maintenance

AC signal output

100 mV/g or 100 mV/in/sec

·       Broad-range protection
Provides protection across a wide range of vibration frequencies by detecting imbalance, misalignment, bad bearings and other machinery-related problems.

·       Vibration Level Setpoints
Two relays activate when field-adjustable vibration levels are exceeded. These relays can be connected to devices to provide visual, audible or external relay activation when a vibration limit has been reached or exceeded. The higher vibration level selected is often used to shut down rotating equipment and avoid further damage.

 

VIBRATION TRANSMITTERS

MONITOR VIBRATION WITH YOUR PLC OR COMPUTER, UP TO 15 MILES AWAY

The Vibration Transmitter is designed for use where continuous vibration monitoring of rotating equipment is required, but trending, alarm or trip functions will be performed by a Programmable Logic Controller, computer or data logger. Mounted directly to your rotating equipment, it generates a 4 to 20 mA DC signal proportional to the velocity of the machine vibration, transmitted over a simple 2-wire current loop. This allows long cable runs, up to 15 miles, for applications from remote pumping stations on pipelines to large facilities like refineries, steel mills and paper mills.

The Vibration Transmitter is operational to 185F. It has a stainless steel case that is compatible with wet, corrosive and explosive* environments, and is available in four full scale ranges: 0-1, 0-2, 0-3 and 0-5 in/sec, with several types of optional mounting adapters.

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Centaxia uses a variety of quality products produced by a number of established manufacturers. Please contact us for specific details for your application.

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