Kobold PPS Manuale utente
PPS_manual_05-05
KOBOLD PPS FLOW SWITCH
User Instructions
USA
1801 Parkway View Drive
Pittsburgh, PA 15205
412-788-2830
Canada
9A Aviation
Point Claire, QC H9R 4Z2
514-428-8090
www.koboldusa.com
Fax: 412-788-4890 Fax: 514-428-8899
Table Of Contents
FM Rev. 05/05
PPS
KOBOLD PPS FLOW SWITCH
1.0 General . . . . . . . . .. . . . . . . . . . . . . . . . . 1
2.0 Specifications. . . . . .. . . . . . . . . . . . . . . . . 2
3.0 Installation . . . . . . .. . . . . . . . . . . . . . . . . 4
4.0 Operation . . . . . . . .. . . . . . . . . . . . . . . . . 5
4.1 Adjustment of the Setpoint. . . . . . . . . . . . 5
5.0 Maintenance. . . . . .. . . . . . . . . . . . . . . . . 5
6.0 Damaged Equipment. . . . . . . . . . . . . . . . 5
7.0 Need Help with your PPS. . . . . . . . . . . . . 5
LIST of DIAGRAMS
Diagram 1.1 PPS Operating Principle. . . . . . . . . . . . . 1
Diagram 2.2 PPS Construction & Dimensions. . . . . . . 3
LIST of TABLES
Table 2.1 Reed Switch Electrical Data. . . . . . . . . . . 2
Table 2.3 Construction. . . . . .. . . . . . . . . . . . . . . . . 3
Table 2.4 Switching Point vs. Pipe Diameter. . . . . . 4
1PPS
FM Rev. 05/05
KOBOLD PPS 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 PPS flow switch is intended for applications in which an electrical
switching function is required once a specific flow rate is achieved.
The PPS is delivered with either a normally-open (N/O) or normally-closed (N/C)
switching function, depending upon ordering code. Switching is achieved through a
magnetically-coupled reed switch which is hermetically isolated from the medium.
The device operates through use of a paddle which is pivoted out of the fluid system by
flow pressure. A cam attached to the top of the paddle then lifts internal magnets into a
region near the reed switch. The magnetic field of the magnets then activates the reed
contacts. A spring acts against the force of the paddle to force magnets out of reed
switch proximity if flow volume decreases beyond a specific value (determined by pipe
diameter & paddle length). (See Diagram 1.1)
Once the PPS has switched, the paddle is almost totally removed from the flow path.
This guarantees minimal pressure loss across the instrument.
Diagram 1.1: PPS Operating Principle
PPS 2
FM Rev. 05/05
2.0 Specifications
Operating Principle: Spring resisted paddle, cam assisted
Dimensions: See Diagram 2.2
Switching Points: See Table 2.4
Maximum Pressure: 145 PSIG
Maximum Media Temperature: 225° F
Maximum Induced Pressure Loss: 1.45 PSI
Switching Repeatability: ± 3%
Fitting: 1” MNPT or G1 (1” BSP) male
Electrical Connection: DIN 43650 Plug/Socket
Table 2.1: Reed Switch Electrical Data
Maximum Voltage: 250 V
Maximum Current: 2.0 A
Maximum Load: 40 VA
Environmental Protection: NEMA 4 / IP 65
3PPS
FM Rev. 05/05
Diagram 2.2: PPS Construction & Dimensions
Table 2.3: Construction
Wetted Materials
Body: Polysulfone
Spring: Stainless Steel
Magnet: Ceramic
Pivot Pin: Stainless Steel
PPS 4
FM Rev. 05/05
Table 2.4: Switching Point vs. Pipe Diameter
3.0 - Installation
Pipe Cut-off Switching point GPM Water
bore mark "L"
inches appr. Turn-on Turn-off
10.9"9.5 5.0
1 1/4 1.1" 9.5 5.0
1 1/2 1.4" 14.5 9.5
2 2.0" 19.0 9.5
2 1/2 2.4" 24.0 14.5
3 2.9" 28.5 19.0
CAUTION: For safety reasons, please read the cautionary information
located at the end of the manual, before attempting installation.
Electrical Connection:
The PPS is designed to be directly mounted into the top of pipes through the use of a
1” NPT fitting. Use PTFE sealing tape for proper sealing and ease of installation.
When installing, it is important to note the following:
1. The flat of the paddle faces into the fluid stream.
2. The paddle is trimmed to the appropriate length of the diameter of the pipe
into which it is installed to achieve the design switchpoint (Table 2.4).
3. The PPS is not so deeply inserted into the pipe so that the paddle touches the
bottom of the pipe.
5PPS
FM Rev. 05/05
4.0 Operation
The PPS comes with either a N/O or N/C switch (at no flow), as specified by order code.
The switching function is factory set and is not user adjustable. The reed switch of the
PPS may be used to switch loads directly as long as switch limits are not exceeded
(Table 2.1). For DC circuits, we strongly suggest the use of a 1A, 1N4000 series diode
wired in parallel with the load (e.g. band or cathode toward positive). For AC loads, use
an RC circuit or MOV (metal oxide varistor) wired in parallel with the switch.
It is important to realize that large capacitive or inductive loads (such as relay coils, light
bulbs, etc.) typically have momentary voltage/current requirements far exceeding any of
the rated operating values of the reed switch. If in doubt, we suggest the use of a higher
capacity isolation relay (such as the Kobold MSR or RL series) to protect your model
PPS flow switch.
4.1 Adjustment of the Setpoint
The switch setpoint is adjustable only via the paddle length. If a higher switchpoint is
desired, paddle length may be changed by additional trimming of the paddle. There is no
specified procedure for this, but in general, for a given pipe diameter:
1. Longer Paddle: Lower switch point
2. Shorter Paddle: Higher switch point
5.0 Maintenance
The simplicity of the device ensures that it is nearly maintenance free. If the media is
dirty, it is possible that the dirt will deposit in the switch body and impede the motion of
the ceramic magnet. In this case, remove the device and clean as appropriate. Do not
use sharp objects to scrape away dirt as this may damage the PPS. After cleaning,
reinstall as per the installation instructions.
6.0 Arrival of Damaged Equipment
Your instrument was inspected prior to shipment and found to be defect-free. If damage
is visible on the unit, we advise that you carefully inspect the packing in which it was
delivered. If damage is visible, notify your local carrier at once, since the carrier is liable
for a replacement under these circumstances. If your claim is refused, please contact
KOBOLD Instruments for further advisement.
7.0 Need help with your PPS
Call one of our friendly engineers at 412-788-2830.
PPS 6
FM Rev. 05/05
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