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S28x Capacitance Coolant Level Switches

Amphenol Rochester Sensors S28x Capacitance Coolant Level Switches are active devices designed to give an alarm signal if liquid falls below or rises above a preset level. These can be specified with a delay to eliminate false alarms due to turbulence. Containing a factory-programmable microprocessor, the switches offer sink-to-ground, source-voltage, or both outputs on separate pins.

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Select	Image	Part #	Mfr.	Description	Datasheet	Availability	Pricing (USD) Filter the results in the table by unit price based on your quantity.	Qty.	RoHS	Series
	Level Sensors - Industrial COOLANT LEVEL SWITCH, 1/2" NPTF, PU 1 LIQ, SI 10 FA, SI AIR, DE3 S287/03 Amphenol Rochester Sensors 1: $97.46 198In Stock New At Mouser	Mfr. Part # S287/03 Mouser Part # 34-S287-03 New At Mouser	Amphenol Rochester Sensors	Level Sensors - Industrial COOLANT LEVEL SWITCH, 1/2" NPTF, PU 1 LIQ, SI 10 FA, SI AIR, DE3 Learn More about Amphenol Rochester Sensors amphenol s28x capacitance coolant level switches	Datasheet	198In Stock	$97.46 $90.45 $87.84 $84.71 View $82.57 $80.61 Quote	Min.: 1 Mult.: 1		S286
	Level Sensors - Industrial COOLANT LEVEL SWITCH, 1/2" NPTF, PU 1 LIQ, SI 10 FA, SI AIR S285/05 Amphenol Rochester Sensors 1: $68.09 72In Stock New At Mouser	Mfr. Part # S285/05 Mouser Part # 34-S285-05 New At Mouser	Amphenol Rochester Sensors	Level Sensors - Industrial COOLANT LEVEL SWITCH, 1/2" NPTF, PU 1 LIQ, SI 10 FA, SI AIR Learn More about Amphenol Rochester Sensors amphenol s28x capacitance coolant level switches	Datasheet	72In Stock	$68.09 $62.96 $61.04 $58.75 View $57.19 $55.74 Quote	Min.: 1 Mult.: 1		S285
	Level Sensors - Industrial COOLANT LEVEL SWITCH, 1/4" NPTF, PU 1 LIQ, SS 0 FA, SI LIQ, SO AIR S285/109 Amphenol Rochester Sensors 1: $66.95 75In Stock New At Mouser	Mfr. Part # S285/109 Mouser Part # 34-S285-109 New At Mouser	Amphenol Rochester Sensors	Level Sensors - Industrial COOLANT LEVEL SWITCH, 1/4" NPTF, PU 1 LIQ, SS 0 FA, SI LIQ, SO AIR Learn More about Amphenol Rochester Sensors amphenol s28x capacitance coolant level switches	Datasheet	75In Stock	$66.95 $61.88 $60.00 $57.74 View $56.20 $54.78 Quote	Min.: 1 Mult.: 1		S285
	Level Sensors - Industrial COOLANT LEVEL SWITCH, 1/2" NPTF, PU 1 LIQ, SS 10 FA, SI LIQ, SO AIR S285/V05 Amphenol Rochester Sensors 1: $83.31 36In Stock New At Mouser	Mfr. Part # S285/V05 Mouser Part # 34-S285-V05 New At Mouser	Amphenol Rochester Sensors	Level Sensors - Industrial COOLANT LEVEL SWITCH, 1/2" NPTF, PU 1 LIQ, SS 10 FA, SI LIQ, SO AIR Learn More about Amphenol Rochester Sensors amphenol s28x capacitance coolant level switches	Datasheet	36In Stock	$83.31 $77.19 $74.91 $72.18 View $70.32 $68.60 Quote	Min.: 1 Mult.: 1		S285
	Level Sensors - Industrial COOLANT LEVEL SWITCH, 1/4" NPTF, PU 1 LIQ, SI 10 FA, SI AIR S285/03 Amphenol Rochester Sensors 1: $60.93 35In Stock 100Expected 10/9/2026 New At Mouser	Mfr. Part # S285/03 Mouser Part # 34-S285-03 New At Mouser	Amphenol Rochester Sensors	Level Sensors - Industrial COOLANT LEVEL SWITCH, 1/4" NPTF, PU 1 LIQ, SI 10 FA, SI AIR Learn More about Amphenol Rochester Sensors amphenol s28x capacitance coolant level switches	Datasheet	35In Stock 100Expected 10/9/2026	$60.93 $56.27 $54.53 $52.45 View $51.03 $49.72 $47.76	Min.: 1 Mult.: 1		S285
	Level Sensors - Industrial COOLANT LEVEL SWITCH, 1/4"NPTF, PU 1 LIQ S298/202 Amphenol Rochester Sensors 1: $74.52 373On Order New At Mouser	Mfr. Part # S298/202 Mouser Part # 34-S298-202 New At Mouser	Amphenol Rochester Sensors	Level Sensors - Industrial COOLANT LEVEL SWITCH, 1/4"NPTF, PU 1 LIQ Learn More about Amphenol Rochester Sensors amphenol s28x capacitance coolant level switches	Datasheet	373On Order On Order Ship Dates Mfr. #: S298/202 Stock: 0 On Order: 123 Expected 10/6/2026 250 Expected 10/29/2026 Factory Lead-Time: 10 Weeks	$74.52 $68.97 $66.90 $64.42 View $62.73 $61.17 Quote	Min.: 1 Mult.: 1		S298
	Level Sensors - Industrial COOLANT LEVEL SWITCH, 1/4" NPTF, PU 1 LIQ, SI 10 FA, SI LIQ S285/13 Amphenol Rochester Sensors 1: $60.93 100Expected 10/29/2026 New At Mouser	Mfr. Part # S285/13 Mouser Part # 34-S285-13 New At Mouser	Amphenol Rochester Sensors	Level Sensors - Industrial COOLANT LEVEL SWITCH, 1/4" NPTF, PU 1 LIQ, SI 10 FA, SI LIQ Learn More about Amphenol Rochester Sensors amphenol s28x capacitance coolant level switches	Datasheet	100Expected 10/29/2026	$60.93 $56.27 $54.53 $52.45 View $51.03 $49.72 $47.76	Min.: 1 Mult.: 1		S285