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Commercial Pool and Spa Supplies

STENNER 45M5 PUMP ADJ 25PSI 50GPD 120V/60HZ 3/8W

STENNER 45M5 PUMP ADJ 25PSI 50GPD 120V/60HZ 3/8W

45MFL5A3SUAA

$1,036.00
$1,036.00
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The Stenner 45M5 (Adjustable Rate Series) peristaltic chemical metering pump is a commercial-grade, self-priming positive displacement feed pump engineered for commercial aquatic chemical automation, municipal water disinfection, and industrial fluid treatment.

Unlike the fixed-rate FX version, the 45M5 features an integrated mechanical indexing feed-rate control ring that allows on-pump output throttling from 5% to 100% (2.5 to 50.0 GPD) against line pressures up to 25 PSI. This mechanical turndown allows operators to manually trim the chemical injection volume per duty cycle to match pool bather load and line turnover rates without altering controller programming.

Nomenclature & Model Decoding

  • 45: Stenner 45 Series single-head peristaltic drive platform.

  • M: Mechanical gear motor drive assembly.

  • 5: #5 Santoprene Pump Tube (high-output tubing insert).

  • ADJ: Mechanically adjustable feed rate (dial ring indexed from L to 10).

  • 25PSI: Low-pressure system rating (up to 25 PSI / 1.72 bar), suited for low-head commercial pool returns.

  • 50GPD: 50.0 US Gallons Per Day maximum output capacity (~2.08 GPH / ~7.88 LPH).

  • 120V/60HZ: Standard North American 120V AC, 60 Hz electrical service.

  • 3/8W: 3/8" Outer Diameter (OD) white opaque suction/discharge tubing and compression fittings.

Mechanical Architecture & Turndown Mechanics

  • Mechanical Feed-Rate Control Ring: Employs a graduated, numbered index ring (L through 10 in 2.5% increments) situated between the motor housing and the pump head.

    • Internally, the control ring mechanically adjusts the engagement stroke of the drive pawl against the roller assembly via a cam clutch mechanism.

    • At setting 10, the roller rotates continuously (100% output, 50 GPD).

    • At lower settings, the pawl disengages the roller assembly during part of each drive revolution, providing true mechanical turndown from 5% (2.5 GPD) to 100% (50.0 GPD).

  • Peristaltic 3-Roller Drive: Traps fluid between advancing rollers across a Santoprene pump tube. This design produces a positive seal at all times, making the pump self-priming against a 25-foot vertical suction lift and naturally anti-siphoning without requiring delicate spring-loaded back-pressure valves.

  • Vapor & Off-Gas Immunity: Easily moves off-gassing oxygen from liquid sodium hypochlorite and fuming hydrochloric acid vapors through the discharge tubing without air-binding or vapor lock.

  • Complete Chemical Isolation: Process chemicals contact only the bore of the Santoprene tube, polyethylene delivery tubing, and the injection duckbill check valve, isolating corrosive fluids from internal drive gears and motor windings.

Technical Specifications

  • Max Output Capacity: 50.0 GPD (approx. 2.08 GPH / 78.9 mL/min / 189.3 L/day) at 25 PSI.

  • Output Turndown Range: 2.5 to 50.0 GPD (5% to 100% capacity via mechanical dial).

  • Maximum Discharge Pressure: 25 PSI (approx. 1.72 bar).

  • Electrical Service: 120V AC, 60 Hz, 1-Phase, 1.7 A (1/30 HP shaded-pole gear motor with automatic thermal overload reset).

  • Pump Tube Spec: #5 Santoprene Tube (Part No. UCCPM05 or single MCCP205).

  • Suction / Discharge Connections: 3/8" OD UV-resistant white polyethylene tubing with compression nut and ferrule assembly.

  • Operating Ambient Limits: 104°F (40°C) maximum ambient air; fluid temperature up to 104°F (40°C).

  • Duty Cycle: Continuous duty rated; controlled via direct AC power or auxiliary dry contacts from Pool Link 500/1000 Series controllers.

Flow Rate Output Matrix (#5 Tube @ 25 PSI)

Dial Setting Percent Output Gallons Per Day (GPD) Gallons Per Hour (GPH) Milliliters Per Min (mL/min)
L (Low) 5% 2.5 0.10 3.9
2 20% 10.0 0.42 15.8
4 40% 20.0 0.83 31.5
6 60% 30.0 1.25 47.3
8 80% 40.0 1.67 63.1
10 (Max) 100% 50.0 2.08 78.9

Weight and Logistics Profile

  • Net Unit Weight: Approximately 7.5 to 8.3 pounds (approx. 3.40 to 3.76 kg).

  • Physical Footprint: Approximately 10.6" L × 5.3" W × 6.0" H (approx. 26.9 cm × 13.5 cm × 15.2 cm).

  • Packaged Shipping Carton: Heavy-duty parcel box measuring approximately 14" L × 10" W × 9" H.

  • Packaged Shipping Weight: Approximately 9.8 to 10.8 pounds (approx. 4.45 to 4.90 kg), including:

    • 3/8" White PE Tubing roll (20 ft).

    • Weighted ceramic suction strainer / foot valve.

    • 1/4" or 1/2" NPT injection fitting with duckbill check valve.

    • Wall mounting bracket, spare #5 Santoprene tube, and latches.

  • Logistics Handling: Ships via standard ground and air parcel carriers (UPS, FedEx, USPS).

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