Kobold SMN Specifications

Flow Switch

for Liquids

measuring

•

monitoring

•

analyzing

SMN

• Low Switch Point

• Low Pressure Drop at High Flows

• Adjustable Reed Contact

• Brass or SS Construction

• Maximum Temperature: 212 °F

• Maximum Pressure: 5000 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

01/02- 2014

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

Flow Switch for Liquids Model SMN

Description

KOBOLD SMN flow switches are used when very low flow switching
points are required along with minimal pressure loss at high flow rates.
Typical applications include the control of water and cooling circuits,
high pressure cleaning devices, control of contaminated media in
effluent and heating systems and many other flow control systems.
Using all-metal wetted parts, the SMN functions using the float
principle. However, it does not use the standard conical metering tube
or slotted measuring nozzle. Instead, a float with an integral magnet is
suspended within a cylindrical measuring tube. The float is moved by
the flow against a compression spring mounted within the instrument.
The magnetic field activates an adjustable reed contact mounted on
the switch body at the desired switch point. This design ensures that
only a very nominal flow rate is required to raise the float sufficiently and
activate the contact. When the float reaches the top of its travel, a wide
flow path opens, allowing high flow rates without a significant increase
in pressure loss typically experienced in other flow switch designs.
When the flow is interrupted, the spring returns the float to its original
position and the contact changes state.

Specifications

Switching Range: On: 0.4...13 GPM Water
Off: 0.25...1 GPM Water
Flow Media: Water or Water-like,
Low Viscosity Liquids

Mounting: Vertical, Upward or
Horizontal Media Flow
Max. Temperature: 212 °F
Maximum Pressure
Brass: 3600 PSIG
SS: 5000 PSIG
Housing Material: Brass or SS
Fittings: 1" FNPT
Electr. Switch Housing: Plastic
Electrical Protection: NEMA 4X / IP65
Reed Contact: Standard: N/O, Optional: SPDT

Max. 230 VDC/0.26 A/60 W
60 VDC/1 A/60 W
Max. 240 VAC/0.42 A/100 W
100 VAC/1 A/100 W
cCSAus Approved
Electrical Connection: Standard: DIN 43 650 w/Cable Gland
Optional: DIN 43 650 w/½" NPT Conduit

Order Details (Example: SMN-5150 U)

Material Model

Brass SMN-5150

SS SMN-5250

Options: (Add Suffix to Order Number)

Suffix "..C" = ½" NPT Conduit Fitting

Suffix "..U" = SPDT Contact

Pressure Drop

Dimensions

2

www.koboldusa.com

No responsibility taken for errors;

subject to change without prior notice.