FloSentinel™ Flow Switch
Typical Liquid & Gas Applications:
- Safety showers
- Pressure sprayers
- Lubricating systems
- Gas leak detection
- Purge flows
- Seal water
Features & Benefits:
- Adjustable, low pressure drop switching for a broad spectrum of liquids and gases
- Only one moving part. No springs, cams, vanes or mechanical linkages to wear out.
- Completely isolated electrical circuitry from the flow media.
- Patented design minimizes pressure drop.
- Not damaged by over flow, flow above 100% range.
- Switch adjustments over the entire full scale.
- External pointer, trigger point settings.
- Available in Brass, T-316 Stainless Steel, PVC, CPVC Electrical classification for NEMA 4 & 7
Description
- Construction: Models of all-wetted brass, T-316 stainless steel, PVC, or CPVC.
- Connections: 3/4" and 1-1/2" NPT standard.
- Switch Type: Normally open, Form A reed switch standard. Non-biased type, hermetically sealed and intrinsically safe.
- Maximum Electrical Ratings: AC version — Maximum 1 amp resistive @ 120 VAC. DC version — 10W @ 100 VDC.
- Electrical Accessories: Separately enclosed SPDT relay with surge suppression.
- Maximum Switch Point Differential: 20% of rate (prevents rapid on-off cycling).
- Repeatability: ±1%
- Electrical Termination: 6" wire leads, 1/2" NPT conduit connector.
- Pressure Rating: Up to 1000 psig ( 3/4" stainless models only), depending on model, construction, and service.
- Temperature Rating: –60°F. to +200°F., depending on model construction. Special high temperature version available as custom.
Installation
FloSentinels are ready to install as-is from the factory. Simply remove the protective thread caps from the inlet and outlet ports, and install vertically (exact plumbness is not essential – if the unit appears vertical, that is generally adequate). In general, there are no special piping requirements, although restrictive valves or fittings with connection sizes different than the Flow Sentinel may affect accuracy slightly.
Operation
MEMFlo FloSentinel flow switches operate with the fluid entering the switch inlet vertically, flowing into the control tube assembly and exciting through the side port. With sufficient flow rates, the fluid displaces the float upward, causing contact closure. The displaced float “uncovers” the flow relief ports, minimizing pressure drop even at flows well above the switch adjustment range. If flow decreases, the float falls and the reed switch contact is lost, causing the alarm condition in most typical applications (low/no flow condition).
