Catalogue Flow Switches
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Barksdale - 4991, 82051, 5517, 208299, 208321
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Switching range and switch point adjustment: Tne switch ranges refer to the limits within which the
switch point may infinitely be adjusted. The actual flow throughput can, depending on the flow velocity, be much larger.
The arrow marking the switch-off-point is positioned in line with the required flow rate, marked on the scale attached to the body.
Switch hysteresis: Hysteresis is the difference in flow between the switch
closing and opening again. By means of the careful choice of reed switches with particularly close differenti­al, a typical hysteresis of 0.5 ...1.5 mm can be achieved with the BFS-series.
ty compensation:
Viscosity compensation is achieved by the combination of the spring and the calibrated orifice inside the piston which guarantees high accuracy over a viscosity range of 1 to 600 cSt.
installation in any position high switch accuracy low switch hysteresis immediate response infinitely adjustable switch point high operating pressures robust design
minimum load for change over (SPDT): 3 VA contact rate for change over (SPDT) with SPS-application:
200 V, 1 A, 20 VA (Please request)
Special features:
Maintenance instructions:
Due to the design, the flow monitor does not require any maintenance. The use of media containing magnetic particles requires cleaning intervals. These cleaning in­tervals can be prolonged by using filters with a magnetie separator.
In case of vertical mounting with flow direction from top to bottom of the type BFS-10-N or BFS-10-0, the lowest switch points might fail to operate due to gravity causing a friction between bore and piston.
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