Low Oil Control - 6304X2M

Castair Low Oil Control — Dual Unit for Duplex Compressor Systems (Part# 6304X2M) The Castair 6304X2M is the dual low oil control unit for duplex compressor systems — two-pump configurations where two compressor pumps operate from a shared tank. Each pump needs independent oil level monitoring, and the 6304X2M provides exactly that: two float switch circuits in a single control assembly, designed for factory-mount installation on Castair duplex industrial compressor setups. If you are building, maintaining, or repairing a Castair duplex industrial compressor, the 6304X2M is the correct low oil protection. Do not try to adapt two separate 6304M units or use a single 6304M on a duplex — the 6304X2M is built for this application and integrates correctly with the duplex motor control circuit. Specifications Part Number: 6304X2M Type: Dual low oil control unit for duplex systems Mount style: Factory mount Application: Castair duplex industrial compressor systems (two-pump configurations) Includes: Two float switch circuits, dual control module, mounting hardware Price: $296.25 What a Duplex Compressor System Is A duplex compressor uses two separate pump-and-motor assemblies connected to a common air receiver tank. The two pumps either alternate (lead/lag operation) or run simultaneously depending on demand. This configuration provides: Higher CFM output than a single pump of the same frame size Redundancy — if one pump needs service, the other continues operating Extended compressor life because neither pump runs continuously — they share the load On Castair duplex systems, the C3U and C4U pumps are common candidates for duplex configurations due to their two-stage industrial design and high CFM output. Each pump has its own crankcase and its own oil supply. Both need independent low oil protection. Why Duplex Systems Need Dedicated Dual-Pump Oil Protection Independent crankcases: Each pump in a duplex has its own oil reservoir. Oil level in pump #1 has no relationship to oil level in pump #2. A single float switch can only monitor one crankcase. Independent failure modes: A small seal leak or unusual oil consumption in one pump will not be reflected in the other. Without independent monitoring, a failing seal in pump #2 will drain that crankcase while pump #1 remains full — the single-pump control sees normal oil and does nothing. Motor circuit integration: The 6304X2M is designed to integrate with the duplex motor control panel, providing shutdown signals for each pump motor independently. This is not something you can replicate cleanly with two separate 6304M units unless you are prepared to do significant custom wiring work. 6304 Family — Complete Picture 6304B ($40.81): Float switch sensor only — replacement component for the sensor half of any 6304-series system 6304M ($147.95): Complete single-unit low oil control for single-pump compressors — factory-mount 6304X2M (this unit, $296.25): Dual-unit low oil control for duplex (two-pump) compressor systems — factory-mount The 6304X2M is priced at $296.25 — approximately twice the 6304M, which makes sense since it contains two complete float switch and control circuits. Compared to the cost of replacing one damaged pump, this is straightforward insurance. Why Every Duplex System Needs This Castair industrial pumps — particularly the C3U and C4U — are cast iron, oil-lubricated machines built for long service life in demanding industrial environments. They are not cheap to replace. Running either pump without low oil protection means a seized crankshaft or scored cylinders is only a matter of time after the first slow oil leak develops. In a busy shop where the compressor runs daily and oil level checks are easy to miss, the 6304X2M pays for itself the first time it prevents a pump failure. Installation Notes The 6304X2M mounts to the compressor installation per factory configuration. The dual float switch circuits must each be installed in their respective pump crankcases. Wiring runs to the duplex motor control panel where each circuit interrupts its respective pump motor on low-oil trip. If you are retrofitting the 6304X2M to an existing duplex system that lacks low oil protection, review your motor control panel wiring before ordering to confirm the control input requirements. Call 866-217-0063 and we can help you work through the integration. Maintenance Test each float switch circuit annually — verify that each pump shuts down independently when oil is lowered to the trip threshold Inspect both float switches (6304B components) during annual pump oil changes Nuisance trips on one pump circuit typically indicate a failed float switch on that side — replace the 6304B for that pump rather than the entire 6304X2M unless the control module is at fault Why Buy From Air Compressor Factory Direct? Castair duplex specialist: We understand the full Castair industrial and duplex product line. If you need help identifying the right low oil control for your configuration, call us. Free shipping on qualifying orders. Free technical support: 866-217-0063 — we can help you confirm the correct part and talk through installation requirements for your specific duplex system. OEM Castair components: The 6304X2M is a genuine Castair part — not an aftermarket adaptation. Full 6304 family in stock: Float switch (6304B), single-unit (6304M), and dual-unit (6304X2M) are all available so you can get exactly what you need. Call 866-217-0063 for quick answers and help!