Kobold PSR, PS Specifications

Paddle Type Flow Switch

for Liquids

measuring

•

monitoring

•

analyzing

PSR / PS

• Switch Point Adjustable

• Easy to Install

• Brass or SS Construction

• Low Cost

• Maximum Pressure, Brass: 1450 PSIG

• Maximum Pressure, SS: 3625 PSIG

KOBOLD companies worldwide:

ARGENTINA, AUSTRALIA, AUSTRIA, BELGIUM, BULGARIA, CANADA, CHILE, CHINA, COLOMBIA,
CZECH REPUBLIC, EGYPT, FRANCE, GERMANY, HUNGARY, INDIA, INDONESIA, ITALY, MALAYSIA,
MEXICO, NETHERLANDS, PERU, POLAND, REPUBLIC OF KOREA, ROMANIA, SINGAPORE, SPAIN,
SWITZERLAND, TAIWAN, THAILAND, TUNISIA, TURKEY, UNITED KINGDOM, USA, VIETNAM

01/06-20-2018

KOBOLD Instruments, Inc.
1801 Parkway View Drive
Pittsburgh, PA 15205

Main Ofce:

1.800.998.1020

1.412.788.4890
[e-mail]
www.koboldusa.com

Paddle Type Flow Switch Models PSR/PS

Description

The KOBOLD PSR and PS are simple, economical and reliable
monitors for flow switching applications. They operate as follows:
The flowing media presses against the paddle fitted to one end of
a balance arm which is in direct contact with a pre-stressed leaf
spring. At the other end of the arm is a permanent magnet. This
magnet actuates a reed contact in a bistable fashion located within
a movable housing located outside of the media. The reed contact
switches on or off depending on the position of the magnet and
the switch housing. The switch status may then be used to control
flow as the contacts can be set to normally open or normally
closed. The PSR is made of brass or stainless steel with 1/4"
NPT to 1-1/2" NPT fittings. The PS is made of brass or stainless
steel with a 1/2" NPT fitting and is designed for installation in 2"
to 8" pipes. Common applications include: cooling and lubricant
circuits, dry running protection for pumps, prevention of low water
levels, and monitoring for pipe breakage.

Specifications

Switching Tolerance: ± 15%
Media Temperature
Brass/NBR Seal: -4...158 °F
SS/FPM Seal: 14...230 °F
Ambient Temperature: Max. 176 °F
Max. Pressure

Brass: 1/4"...1" = 1450 PSIG
1-1/4"...1-1/2" = 360 PSIG
SS: 1/4"...1" = 3600 PSIG
1-1/4"...1-1/2" = 580 PSIG

Ingress Protection: IP 65
Mounting Orientation: Horizontal Flow Preferred
Max Flow Rate: 5x Switching Range, Increasing

Maximum Contact Ratings (cCSAus):
SPST Contact: 2A, 20 VAC, 0.18 A, 230 VAC,

max. 40 W
SPDT Contact: 0.13 A, 150 VAC, 0.5 A, 40 VAC,
max. 20 W

Cable: PVC Jacketed
Cable Length: Standard: 5 Ft. (1.5m),

Optional (SPST only): 10, 15 or 21 Ft.

Model PS Model PSR

Materials

PSR/PS-51.. PSR/PS-52..

Case MS58 Brass 304 SS

Paddle 304 Stainless Steel

Leaf Spring 301 Stainless Steel

Balance Arm 301 Stainless Steel

Sleeve MS58 Brass 304 SS

Magnet Oxide Ceramics

Seal NBR FKM

Contact Tube Polyamide, Glass Reinforced

*U.S. Patent Number: 4,827,092

Order Details: PSR w/Standard Switching Ranges (Example: PSR-5105)

Connection

(NPT)

1/4" 0.6...1.2 0.4...1.2 PSR-5105 PSR-5205

3/8" 0.7...1.5 0.6...1.4 PSR-5110 PSR-5210

1/2" 0.7...1.6 0.5...1.6 PSR-5115 PSR-5215

3/4" 2.0...3.5 1.6...3.4 PSR-5120 PSR-5220

1" 2.0...4.8 1.9...4.5 PSR-5125 PSR-5225

1-1/4" 5.2...9.7 5.3...8.5 PSR-5132 PSR-5232

1-1/2" 6.1...15.2 6.2...14.0 PSR-5140 PSR-5240

*Listed values are valid only for horizontal installations

2

Approximate Switching Range* Model / Material

Increasing GPM

(Water)

Decreasing GPM

(Water)

Brass Stainless Steel

www.koboldusa.com

Options

..U = SPDT Switch, 5 Ft. Cable

..EC10 = SPST w/10 Ft. Cable

..EC15 = SPST w/15 Ft. Cable

..EC21 = SPST w/21 Ft. Cable

No responsibility taken for errors;

subject to change without prior notice.