440SR-2020-0200 | Metrix 440 Series Electronic Vibration Switches

Ordering Information Model 440 440 Electronic Vibration Switch Number of Alarm Setpoints(1) SR One alarm setpoint(2) Analog Proportional Output 2 4-20 mA(absolute)(3) Scale Range(3)(4) 0 0.1 – 1.5 in/sec (derived peak) Shutdown Circuit Output(5) 2 Solid-state switch (170 mA, 250 Vpk)(6) Alarm Circuit Output(5) 0 None(2) Approvals / Local Reset / BNC connector 0 CSA Approvals (Class I, Div 2, Gps B-D) No local reset pushbuttonNo BNC connector Input Power 2 24 Vdc Power-up Timed Inhibit (i.e., LOCKOUT)(7) 0 None Transducer Option 0 Transducer Option Some older switches may simply be labeled “S” instead of “SR” and “D” instead of “DR”.When a single alarm setpoint is ordered (A = SR), only a shutdown circuit is provided and option E must be 0. The analog proportional output (option B) is related to scale range (option C) and will be 4mA when vibration levels are at or below the bottom scale range. 4 mA = bottom scale range and 20 mA = top scale range. The 440 switch uses a true RMS amplitude detector and scales its output by 1.414 (RMS x v2) to give a so-called “derived peak” measurement. Because this measurement is derived from the RMS value, it will equal true peak only under the special case of a pure sinusoid, not complex vibration signals.For dual setpoint switches, the type of output for shutdown and alarm circuits must be the same. For example, a 440-DR switch with a Triac shutdown circuit (D=0) must also use a Triac alarm circuit (E=1).Solid-state switch output types are recommended for connection to light loads such as discrete inputs on PLCs or DCSs. This output type is easier to interface as it has virtually no leakage current (10 µA or less), and does not require any holding current. It also switches AC or DC signals equally well.The optional Power-up Timed Inhibit (LOCKOUT) feature is invoked by initial application of (or cycling) primary power to the switch. This feature inhibits alarms from activating for 20 seconds. This feature is used primarily as a “startup delay” capability for machines that exhibit elevated vibration levels during startup relative to normal running levels. To invoke the feature in this manner, power to the switch should be applied (or cycled) concurrent with machine startup.