ERECTA SWITCH® by Compac Engineering
Series 5 · ERECTA SWITCH®

5-18-AC — Flow/No-Flow Indicator — Acetal

Visual-only flow indicator. No electrical output. Transparent polysulfone window shows poppet position to confirm flow presence. Acetal construction handles solvent, hydrocarbon, and chemically aggressive applications beyond polypropylene's range.

5-18-AC Flow/No-Flow Indicator — Acetal

Configure & Order

Material
AC — Acetal
SKU: 5-18-AC
Qty
⚙ Requires accessory fittings — 9/16-18 UNF ports need Series 5 fittings for pipe connection. View 5-XX Fittings →
In stock · Ships Wednesday · Made in Paradise, CA · No minimum order
Net Price — per unit
QuantityPrice
1–9$31.89
10–24$29.08
25–49$25.06
50–99$22.66
100–199$19.65
200+$16.24
As low as $16.24 · OEM pricing for 1000+ quoted upon request.

Product Description

The 5-18-AC is the visual flow indicator in acetal for petroleum and hydrocarbon service.

SpecificationValue
Series5-18
TypeVisual indicator only — no electrical output
MechanismSpring-loaded poppet (same as 5-20/5-21)
BodyAngle body
Overall Length4.6 in (116.8 mm)
Ports3× 9/16-18 UNF
MaterialsAcetal
ComplianceRoHS

What Makes the 5-18-AC the Right Choice

Visual flow confirmation — no wiring
Transparent polysulfone window shows poppet position. No electrical connection, no wiring, no switch. Ideal as a secondary confirmation device.
Same poppet mechanism as 5-20/5-21
Spring-loaded poppet in an angle body. Interchangeable poppets with the rest of the Series 5 line.
ERECTA SWITCH modular architecture
Every component is independently field-replaceable. Poppets, fittings, and trim sets service individually — no need to replace the entire switch body.
Acetal construction
Handles solvent, hydrocarbon, and chemically aggressive applications beyond polypropylene. Acetal resists fuels, hydraulic fluids, and many organic solvents.
Hermetically sealed reed switch
SPST N.O., closes on flow. 70 VA / 50W resistive. 0.5A AC / 0.7A DC. 300 VAC / 350 VDC maximum. No mechanical contact with liquid. Inductive loads such as solenoid and relay coils require external arc suppression; above the rating, isolate the load with a Series 50 relay.
RoHS compliant · Made in USA
Every Series 5 switch manufactured in Paradise, California. RoHS compliant throughout. No minimum order.

Where the 5-18-AC Is Specified

Questions About This Product?

Our engineering team can verify compatibility with your application and chemistry before you order.