Kobold SMN-5150CU – SMN All-Metal Flow Switch, Brass, 1″ NPT, SPDT Contact, Conduit Connection
The Kobold SMN-5150CU is an all-metal flow switch for liquids from Kobold’s SMN series, with a brass body, a 1″ NPT female process connection, an SPDT (changeover) reed contact and a DIN 43650 plug with 1/2″ NPT conduit fitting. It combines a very low switch point with minimal pressure loss at high flow rates, and it withstands high pressures.
This version brings together the two SMN options. The changeover contact gives both a normally open and a normally closed output from one switch, for example to stop a machine and trigger an alarm at the same time. The conduit fitting connects directly to electrical conduit, which is standard in North America and in many industrial plants. The switch works on the float principle: a float with an integral magnet operates the reed contact at the switch point, and at higher flows an additional flow path opens, so the pressure drop stays low.
Key Technical Data – Kobold SMN-5150CU
- Series: Kobold SMN all-metal flow switch
- Body and wetted parts: Brass
- Process connection: 1″ NPT, female
- Switching range: ON 0.4–13 GPM; OFF 0.25–1 GPM (water)
- Media: Water or water-like, low-viscosity liquids
- Mounting: Vertical (upward flow) or horizontal
- Max. temperature: 100 °C (212 °F)
- Max. pressure (brass): 250 bar (approx. 3,600 psi)
- Contact: Reed contact, SPDT (changeover)
- Electrical connection: DIN 43650 plug with 1/2″ NPT conduit fitting
- Approval: cCSAus (SMN series)
Options and Related Models
- SMN-5150CU: SPDT contact, conduit connection (this item)
- SMN-5150: NO contact, cable gland
- SMN-5150U: SPDT contact, cable gland
- SMN-5150C: NO contact, conduit connection
- SMN-5250: stainless steel version
Contact type, electrical connection and material must match the original installation. Our sales team can help you confirm the right version.
Typical Applications
- No-flow alarms with machine stop in cooling water circuits with conduit wiring
- High-pressure cleaning equipment
- Heating and effluent systems
- Replacement flow switches for installed SMN systems
Buy Kobold SMN-5150CU from Atlantech Drives
- Fast sourcing, shipped worldwide
- 12-month warranty
- Senior commercial advice on flow switch versions and lead time
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