1PSR/PS
KOBOLD PSR/PS FLOW SWITCH
User Instructions
CAUTION: For safety reasons, please read the cautionary information located at
the end of the manual, before attempting installation.
1.0 General
The KOBOLD PSR/PS flow switch is intended for applications in which an electrical
switching function is required once a specific flow is achieved.
The PSR/PS can be set to operate as either a normally-open (N/O) or normally-closed
(N/C) switch. Switching is done with a reed contact which is electrically isolated from the
flowing medium.
The device operates through use of a paddle-spring arrangement. The flowing medium
exerts force on the lower part of the paddle ( in the T-piece ). The paddle pivots about a
point higher in the PSR/PS body but is resisted by a leaf spring. On the upper part of the
paddle is a magnet, which moves as the paddle pivots about its center. A reed switch is
located outside the PSR/PS housing ( thus hermetically isolated ) inside a movable
plastic housing. As the magnet nears the reed switch, the switch closes. By moving the
switch, with adjustable switch point.
2.0 Specifications
Table 2.1: Technical Data
Operating Principle: Spring resisted paddle
Dimensions: See Diagram 2.4
Ranges: See Diagram 2.3a & 2.3b
Maximum Pressure: Most Brass/SS units:1450 PSIG (100 Bar)
NOTE:
PSR-5132 & PSR-5140: 360 PSIG (25 Bar)
Maximum Medium Temperature: 230 Degrees F (110 Degrees C)
Maximum Ambient Temperature: 150 Degrees F ( 65 Degrees C)
Reed Switch Specifications: See Table 3.2
Rev. 3/13
reed switch, the flow required to close it is altered. The result is a flow-sensitive reed
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