Công tắc rung (Electronic Vibration Switch)_Model: 440-DR-2201-0100

Công tắc rung (Electronic Vibration Switch) - Metrix

Model: 440-DR-2201-0100

OVERVIEW

Metrix 440 and 450 electronic vibration switches provide economical, self-contained, single-channel vibration protection. The 440 switch is suitable for use in non-hazardous as well as Class I Div 2 hazardous areas. The 450 switch utilizes the same internal electronics as the 440, but features explosion-proof enclosure styles suitable for Class I Div 1, Class II Div II, and Class III hazardous areas. Options are available for electronic (triac or FET) or electromechanical relay outputs, allowing the switch to be used in an auto-shutdown circuit that trips the machine under high vibration conditions. SR versions provide a single alarm setpoint and corresponding discrete output. DR versions provide two independent alarm setpoints and corresponding discrete outputs, allowing implementation of ALERT (pre-shutdown) and DANGER (shutdown) levels. A separate 4-20 mA proportional output is also provided on all switch models, allowing connection to PLCs, DCSs, strip chart recorders, or other process control systems where vibration levels can be trended. Vibration on both switches is monitored in RMS velocity units. The standard configuration consists of an internal accelerometer mounted inside the switch housing, providing completely selfcontained functionality. The switch may also be configured to use an external accelerometer if desired.*

APPLICATIONS:

Vibration switches are an attractive solution when all of the following criteria apply: 

• Only one or two measurement points are required on a machine. 

• A fully self-contained approach is desired or required (sensing element, signal conditioning, alarming, and outputs). 

• Sufficient room exists to mount a vibration switch on the machine in the correct location and in the correct orientation such that the vibration levels indicative of machinery malfunctions will actually be measurable at the switch mounting location. 

• The features of a multi-channel monitoring system are not necessary and cannot be financially justified. 

• A 4-20mA vibration transmitter is undesirable or impractical because a PLC, DCS, SCADA system, or other instrumentation is not available for monitoring the transmitter signal.