450-DR-2001-0200 | Metrix Series 450 Electronic Vibration Switch

Ordering Information Model 450 Series 450 Electronic Vibration Switch Number of Alarm Setpoint(1) DR Two alarm setpoints Analog Proportional Output 2 4-20 mA(absolute)(2) Scale Range(2)(3) 0 0.1 – 1.5 in/sec (derived peak)(3) Shutdown Circuit Output(4) 0 Triac (5A, SPST)(5) Alarm Circuit Output(4) 1 Triac (5A, SPST)(5) Housing / Approvals 0 Standard NEMA 4 housing (4-hole pattern)Solid cover CSA Class I Div 1 Groups B-D approvals CSA Class II Div 1 Groups E-G CSA Class III Input Power 2 24 Vdc Power-up Timed Inhibit (i.e., LOCKOUT)(6) 0 None Transducer Option 0 Internal Accelerometer Some older switches may simply be labeled “S” instead of “SR” and “D” instead of “DR”.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 450 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 450-DR switch with a Triac shutdown circuit (D=0) must also use a Triac alarm circuit (E=1). Triac output types are recommended when switching medium power rated AC devices such as motor starters, contactors, and relays. However, triacs require a 50mA holding current and exhibit a leakage current of 1mA.The optional Power-up Timed Inhibit 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.