ERECTA SWITCH® by Compac Engineering
Series 10 · Subcategory 5

Three Level Extended Stem
Switch Sets

Designing equipment that requires high, mid, and low liquid level control from a single installation point? ERECTA SWITCH three-level sets configure off the shelf — three mount styles, two housing options, three material choices — no custom fabrication required.

10 Models PP · Acetal · Kynar 3 Mount Styles Slosh Shield Options 1–70″ Nipple Lengths RoHS Compliant
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Level and Temperature Sensing — In One Assembly

ERECTA SWITCH Series 10 two, three, and four level extended stem sets can now be configured with one or more Series 11-800 bimetallic temperature switches substituted for any level switch position. Detect both critical liquid levels and temperature limits — freeze protection, overheat detection, or process limits — in a single tank penetration, from standard stock.

Three Material Options — One Modular System

Every ERECTA SWITCH three-level set is available in Polypropylene, Acetal, or Kynar. The same modular configuration ships in all three. OEMs designing for multiple chemical environments often specify more than one.

PP — Polypropylene

General Chemical Service

The standard specification for aqueous and mildly aggressive environments

Handles the broadest range of industrial chemicals at the lowest cost. Resistant to acids, bases, bleach solutions, detergents, and most aqueous process fluids.

  • Wash cycle chemistry and detergent solutions
  • Cooling tower treatment chemicals
  • General process fluids and water systems
  • Food-grade cleaning and sanitizing solutions
AC — Acetal

Hydrocarbon & Solvent Service

For oils, fuels, and non-oxidizing environments where PP is insufficient

Superior dimensional stability and mechanical strength. Resistant to hydrocarbons, aliphatic solvents, oils, and fuels where fluid chemistry attacks polypropylene.

  • Hydraulic fluid and machine oil
  • Diesel fuel and petroleum distillates
  • Aliphatic solvent systems
  • Non-oxidizing process fluids
KR — Kynar (PVDF)

Aggressive Chemical & High-Purity Service

The specification when PP and Acetal fail

Handles strong oxidizers, halogenated solvents, concentrated acids, bromine, and semiconductor-grade process chemicals. Also correct for high-purity systems where material leaching is unacceptable.

  • Semiconductor wet bench chemistry
  • Chlorine, bromine, strong oxidizer service
  • Concentrated mineral acids
  • High-purity and ultra-pure process fluids

Material suffix appended to part number at time of order: 10-715-PP-12 (polypropylene, 12″) · 10-715-AC-12 (acetal) · 10-715-KR-12 (Kynar). Same ERECTA SWITCH set, same configuration — different material suffix. Contact us for chemical compatibility guidance on your specific fluid.

Three Level Switch Sets — All 10 Configurations

Organized by mount type, then housing style. Each set ships complete with switches, connectors, spacers, and housing. Note: 1-1/4″ NPT mount is not available for three-level sets — the opening is too small to pass three switch assemblies outside-in. Precision nipples (10-715) are required for each switch position and are sold separately.

Precision nipples (10-715) are required and sold separately. Each switch position requires one nipple to set the liquid level at actuation. The upper switch may mount directly to the receptacle without a nipple. Use the Nipple Length Calculator below to determine part numbers before ordering.

-SS models add two items over the base: three slosh shields (10-700-SS) — one per switch position — that stabilize float actuation in turbulent liquid, and a 10-700-WC liquid tight strain relief connector for weatherproof wiring entry. Base models include neither.

2″ NPT Adapter 2″ NPT Adapter Mount — 10-303, 10-303-SS, 10-306, 10-306-SS Removable 10-700-AS adapter · Drums & 2″ bung tanks · Outside-in
Receptacle Housing Compact low-profile receptacle — minimal above-bung height
10-303 Three Level Extended Stem Switch Set — 2 inch NPT Adapter Receptacle
10-303
2″ AdapterReceptacle

Three-level monitoring — high, mid, and low — from a single 2″ NPT bung using the compact receptacle housing. The removable 10-700-AS adapter steps from the receptacle's 1-1/4″ threads to 2″, allowing the three-switch stem assembly to install outside-in without internal tank access. Specify the 10-303-SS when pump cycling or fill turbulence creates float-disrupting agitation.

  • Mount2″ NPT adapter (removable)
  • HousingReceptacle
  • MaterialPP / AC / KR
  • Switch Positions3 (high / mid / low)
  • Nipple Range1–70″ · sold separately
10-303-SS Three Level Switch Set — 2 inch NPT Adapter Receptacle with Slosh Shields
Slosh Shields
10-303-SS
2″ AdapterReceptacle

The 10-303 fully accessorized for turbulent bung-mount applications. Three slosh shields stabilize each float position independently — critical in three-level designs where mid-level false triggers can disrupt staged process logic. The 10-700-WC liquid tight connector seals wiring entry against wash-down and chemical exposure. Preferred for commercial laundry systems, chemical dosing circuits, and process tanks with active agitation.

  • Mount2″ NPT adapter (removable)
  • HousingReceptacle
  • Slosh ShieldsIncluded (10-700-SS × 3)
  • LT ConnectorIncluded (10-700-WC)
Relay Housing FR ABS relay housing — integrated relay compartment at the 2″ bung
10-306 Three Level Switch Set — 2 inch NPT Adapter Relay Housing
10-306
2″ AdapterRelay Housing

Three-level monitoring for 2″ bung tanks with integrated relay control at the mount point. The FR ABS relay housing consolidates three switching points, relay logic, and conduit attachment into one bung-mount assembly — all installed outside-in. Choose the 10-306 when your three-level design routes relay control through the switch housing rather than an external panel.

  • Mount2″ NPT adapter (removable)
  • HousingFR ABS Relay Housing
  • MaterialPP / AC / KR
  • Switch Positions3 (high / mid / low)
  • Nipple Range1–70″ · sold separately
10-306-SS Three Level Switch Set — 2 inch NPT Adapter Relay Housing with Slosh Shields
Slosh Shields
10-306-SS
2″ AdapterRelay Housing

The most complete three-level control assembly for 2″ bung applications. Relay housing, slosh shields at all three positions, and liquid tight connector — mounting, relay logic, float stabilization, and weatherproof wiring from one outside-in installation. The correct specification when agitated bung-mount applications require both relay control at the tank and reliable mid-level switching.

  • Mount2″ NPT adapter (removable)
  • HousingFR ABS Relay Housing
  • Slosh ShieldsIncluded (10-700-SS × 3)
  • LT ConnectorIncluded (10-700-WC)
Flange Nut Flange Nut Mount — 10-304, 10-304-SS, 10-307, 10-307-SS Smooth hole 1.65–2.3″ dia · Dual O-ring seal · Internal access required for bottom nut
Receptacle Housing Compact receptacle — minimal above-tank height at the flange
10-304 Three Level Switch Set — Flange Nut Receptacle
10-304
Flange NutReceptacle

Three-level monitoring through a smooth-cut hole in a flat tank wall or lid — no NPT port required — with the compact receptacle housing. Cut a 1.65–2.3″ hole; the outer flange nut with dual O-ring seal clamps from outside, inner nut from inside. Three switch positions cover high, mid, and low level in a single flange penetration. Flange nuts available in PP, Acetal, or Kynar.

  • MountFlange nut (2 nuts + 2 O-rings)
  • HousingReceptacle
  • Hole Size1.65–2.3″ dia.
  • Nut MaterialPP / AC / KR
  • AccessInternal req'd (bottom nut)
10-304-SS Three Level Switch Set — Flange Nut Receptacle with Slosh Shields
Slosh Shields Kynar Available
10-304-SS
Flange NutReceptacle

The 10-304 fully accessorized for turbulent or chemically aggressive flange-mount applications. Three slosh shields stabilize every switch position — particularly valuable for mid-level control where false triggers from agitation disrupt staged process sequences. With Kynar flange nuts specified, this delivers the highest chemical resistance in the receptacle flange group — semiconductor wet processing, aggressive acid, and high-purity service.

  • MountFlange nut (2 nuts + 2 O-rings)
  • HousingReceptacle
  • Slosh ShieldsIncluded (10-700-SS × 3)
  • LT ConnectorIncluded (10-700-WC)
  • Nut MaterialPP / AC / KR
Relay Housing FR ABS relay housing — integrated relay at the flange mount point
10-307 Three Level Switch Set — Flange Nut Relay Housing
10-307
Flange NutRelay Housing

Three-level flange-nut monitoring with the full FR ABS relay housing. Cut a 1.65–2.3″ hole; outer flange nut with dual O-ring seal clamps from outside, inner nut secures from inside. The relay housing adds an integrated relay compartment and cam lock conduit base directly above the flange — switch, relay logic, and conduit attachment in one flat-wall installation. Internal access required for bottom nut.

  • MountFlange nut (2 nuts + 2 O-rings)
  • HousingFR ABS Relay Housing
  • Hole Size1.65–2.3″ dia.
  • Nut MaterialPP / AC / KR
  • AccessInternal req'd (bottom nut)
10-307-SS Three Level Switch Set — Flange Nut Relay Housing with Slosh Shields
Slosh Shields Kynar Available
10-307-SS
Flange NutRelay Housing

The most complete three-level flange-mount assembly in Series 10. Relay housing, dual O-ring flange seal, three slosh shields, and liquid tight connector in one unit. With Kynar flange nuts specified, this handles the most demanding chemical environments — semiconductor process chemistry, concentrated acids, strong oxidizers — while delivering reliable three-point level control with on-board relay logic.

  • MountFlange nut (2 nuts + 2 O-rings)
  • HousingFR ABS Relay Housing
  • Slosh ShieldsIncluded (10-700-SS × 3)
  • LT ConnectorIncluded (10-700-WC)
  • Nut MaterialPP / AC / KR
Pop-In Pop-In Mount — 10-308, 10-308-SS 1-9/16″ hole · Thin-wall plastic only · Outside-in · No internal access
10-308 Three Level Switch Set — Pop-In Mount
10-308
Pop-InPop-In Receptacle

Three-level monitoring for thin-wall plastic tanks and lids — outside-in, no hardware, no internal access. Cut or punch a 1-9/16″ hole; the 10-702-R1 pop-in receptacle snaps in and the O-ring locks for a liquid-tight seal. Wall must be plastic, 0.062–0.078″ thick. Three switch positions cover high, mid, and low from one penetration point — the most efficient three-level installation available for injection-molded enclosures and polyethylene reservoirs.

  • MountPop-in snap lock
  • HousingPop-In Receptacle (10-702-R1)
  • Hole Size1-9/16″ (39.67mm)
  • Wall Thickness0.062–0.078″ plastic only
  • Switch Positions3 (high / mid / low)
10-308-SS Three Level Switch Set — Pop-In Mount with Slosh Shields
Slosh Shields
10-308-SS
Pop-InPop-In Receptacle

The 10-308 with three slosh shields and liquid tight connector for plastic tank applications where surface agitation is a factor. All three float positions are stabilized — outside-in snap installation retained. Preferred for thin-wall polyethylene reservoirs in wash systems, chemical dispensing equipment, and HVAC condensate units where pump cycling creates turbulence that would otherwise cause mid-level nuisance trips.

  • MountPop-in snap lock
  • Hole Size1-9/16″ (39.67mm)
  • Slosh ShieldsIncluded (10-700-SS × 3)
  • LT ConnectorIncluded (10-700-WC)

Precision Nipple Length Calculator — Three Level Set

Each of the three switch positions requires one 10-715 precision nipple. The upper switch may also mount directly to the receptacle without a nipple. Enter your desired liquid levels and the calculator outputs correct part numbers for all three positions.

Distance from mounting surface to high-level actuation point
Distance from mounting surface to mid-level actuation point
Distance from mounting surface to low-level actuation point

Nipple Specification — Three Level Set

All Models — Quick Reference

All models ship as complete switch sets. Precision nipples (10-715) sold separately — specify length 1–70″ and material at time of order.

ModelMountHousingPort / HoleSS ShieldsLT ConnectorAccessRoHS
10-3032″ AdapterReceptacle2″ NPT bungNoNoOutside-in
10-303-SS SS2″ AdapterReceptacle2″ NPT bungYes ×3YesOutside-in
10-3062″ AdapterRelay Housing2″ NPT bungNoNoOutside-in
10-306-SS SS2″ AdapterRelay Housing2″ NPT bungYes ×3YesOutside-in
10-304Flange NutReceptacle1.65–2.3″ holeNoNoInternal req'd
10-304-SS SS KynarFlange NutReceptacle1.65–2.3″ holeYes ×3YesInternal req'd
10-307Flange NutRelay Housing1.65–2.3″ holeNoNoInternal req'd
10-307-SS SS KynarFlange NutRelay Housing1.65–2.3″ holeYes ×3YesInternal req'd
10-308Pop-InPop-In Receptacle1-9/16″ holeNoNoOutside-in
10-308-SS SSPop-InPop-In Receptacle1-9/16″ holeYes ×3YesOutside-in

Where Engineers Specify Three-Level Control

Three switching points from a single installation — high alarm, mid operating range, and low shutoff — in the same verticals where two-level control is specified, with more complex process logic requirements.

Vertical 1

Commercial Laundry OEMs

High-alarm, operating-fill, and low-empty on chemical dispensing tanks where a mid-level trigger initiates refill before the process runs dry.

Reference: Ecolab-type laundry systems
Vertical 2

HVAC / Chiller Manufacturers

Three-stage coolant level management — high overflow shutoff, normal operating range confirmation, and low-level pump protection on process chiller reservoirs.

Vertical 3

POU Water Purification / R.O.

Three-point storage tank management on R.O. systems and water vending machines — full alarm, normal dispense level, and low-level pump cutoff.

Vertical 4

Semiconductor Wet Processing

Wet bench chemistry level — high overflow alarm, process operating level confirmation, and low-level chemistry replenishment trigger. Kynar required.

Vertical 5

Hydraulic Systems

Three-stage HPU reservoir monitoring — high-level overfill alarm, normal operating band confirmation, and low-level emergency pump shutoff.

Reference: Durable Controls HPU designs
Vertical 6

Chemical Injection Systems

High-level overfill, mid-level reorder trigger, and low-level pump-dry protection on reagent day tanks and chemical dosing vessels.

Reference: Q-Lab test chamber fluid systems
Vertical 7

Commercial Pressure Washers

Three-stage detergent tank management — full alarm, operating level, and low-level empty signal — on chemical proportioning and hot water pressure wash systems.

Reference: Hydro Systems equipment
Drum · Tote · Pail

Bulk Chemical Container Monitoring

Three-stage monitoring on 55-gallon drums and 275-gallon IBC totes — full confirmation, mid-level reorder alert, and empty signal before the process stops.

Engineering Data & Drawings

Dimensional drawings, nipple length formulas, component part lists, and chemical compatibility data for all Series 10 Three Level Extended Stem models.

Other Series 10 Subcategories