Plant monitor reacts to dangerous vibrations
A
Monitran product story
Edited by the Engineeringtalk editorial team
Mar 12, 2008
The VS0004 contains a double-pole double-throw relay for each alarm level and the user effectively wires to the normally open (NO) or normally closed (NC) contacts.
Monitran has released the VS0004, a complete condition monitoring and alarm module.
Fixed to a piece of plant machinery, the VS0004 can respond to a rise in vibration levels in a number of user-definable ways.
The unit has two alarm levels, with the user able to set Alarm 1 between 1 and 50mm/s and with Alarm 2 capable of being set as 1.5, two, three or five times the level of Alarm 1.
Bob Pickard, Monitran's Technical Director, said: "One option users have is to use Alarm Level 1 to sound an alarm and use Alarm Level 2, with its higher limits, to shut down equipment".
The unit has a 4-20mA output scaled to Alarm 2 and so can be interfaced with PLCs or other control circuitry.
The VS0004 contains a double-pole double-throw relay for each alarm level and the user effectively wires to the normally open (NO) or normally closed (NC) contacts depending on what action is to be taken when an alarm limit is reached.
The switching capability of each relay is 8A at 240V AC or 30V DC.
The switch module also features a 10 second alarm on time constant and a 30 second start-up delay.
Pickard continues: "The start-up delay is of particular benefit if the unit is attached to machinery which naturally shakes during power-up".
"Without the delay, you'd be faced with either accepting a few false alarms or setting your alarm levels higher".
The VS0004 is available with latching or nonlatching indicators.
Pickard said: "Latching means the unit's Alarm Level LEDs will remain illuminated even after vibration levels have fallen below their corresponding limits".
"This is particularly useful as, under certain circumstances, you may not otherwise be aware that alarm or shutdown conditions had been reached".
A reset button is present on the indicator latching version of the VS0004.
Sealed in a die-cast aluminium enclosure, the VS0004 weighs approximately 0.8kg and measures 80 x 125 x 82mm.
Its frequency response is 5Hz to 1kHz and its operational temperature range is -10 to +85C.
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