Metrix 440 and 450 electronic vibration switches provide eco-nomical, 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 electro-mechanical 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 self-contained functionality. The switch may also be configured to use an external accelerometer if desired.*