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Stainless steel side-mount liquid level switch with 1-inch NPT connection

Madison

Madison M4190-HP SPST Tank Liquid Level Switch 240VAC 900 psi

SKU CH-XNK2-F2X2T

A selectable-function liquid level switch for tank side-mounting with a 1-inch NPT connection, rated to 900 psi and 240 VAC

  • TypeLight Switch
  • Selectable switch function adapts to tank logic
  • 900 psi rating handles high-pressure vessels
  • 316 stainless float resists corrosion in harsh fluids
  • 240 VAC 1 A SPDT contact controls pumps directly
  • 302 °F max temperature suits hot liquid service

Liquid level switch for 900 psi tanks

The Madison M4190-HP is a side-mount SPST switch with selectable function for tank liquid level monitoring. It fits a 1 in NPT connection and uses a 316 stainless steel float on a 304 stainless steel stem. The assembly handles up to 240 VAC and 1 A with a 100 VA rating. Buyers needing a different mount style or lower pressure rating should look elsewhere.

Sustained load behaviour at 302 °F

The switch maintains its electrical ratings at the full 302 °F operating temperature limit. The 304 stainless steel stem and 316 stainless steel float resist corrosion during continuous immersion. The 100 VA rating and 1 A maximum current hold steady without derating across the temperature range. Installations exceeding 900 psi or requiring a different contact form will need another device.

Replaces fixed-function level switches

The selectable switch function lets one part replace separate normally-open or normally-closed units in existing 1 in NPT ports. The 3.98 in overall length matches many legacy side-mount cutouts. Upgrading is worthwhile when consolidation reduces spare-part counts or when the 900 psi rating exceeds the original equipment specification. Systems needing SPDT contacts or a different conduit size cannot use this model.

Highlights

  • Selectable switch function adapts to tank logic
  • 900 psi rating handles high-pressure vessels
  • 316 stainless float resists corrosion in harsh fluids
  • 240 VAC 1 A SPDT contact controls pumps directly
  • 302 °F max temperature suits hot liquid service

Specifications

BrandMadison
TypeLight Switch

Questions about this item

How much heat does the 302 °F maximum operating temperature generate for the SPST switch during continuous use?

The switch is rated for up to 302 °F ambient temperature; it does not produce significant self-heating beyond the process temperature it senses.

What tank fitting does the 1 in NPT connection require on my vessel?

The side-mount switch threads into a standard 1 in NPT tank opening; no additional flange or adapter is needed.

Will the 316 stainless-steel float resist corrosion in the same fluids as my existing 304 stainless-steel fittings?

The 316 float offers higher corrosion resistance than 304 stem material, so it will perform at least as well in compatible media.

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