STENNER 85M5 PUMP ADJ 25PSI 85GPD 120V/60HZ 3/8W

The Stenner 85M5 (85MHP5 / 85 Series Adjustable Rate Low-Pressure) peristaltic chemical metering pump is a commercial-grade, high-capacity positive displacement chemical feed pump engineered for high-demand commercial aquatics, municipal water disinfection, and agricultural fluid treatment.

Combining an 85 Series high-speed gear motor with a low-pressure #5 Santoprene pump tube, it delivers a maximum volume of 85.0 GPD (Gallons Per Day) against system backpressures up to 25 PSI (1.72 bar). Equipped with an integrated mechanical feed-rate control ring, it allows on-pump mechanical throttling from 4.3 to 85.0 GPD (5% to 100%), giving operators precise field control over chemical dosage when paired with Pool Link 500/1000 Series automation controllers.

Nomenclature & Model Decoding

• 85: Stenner 85 Series platform (high-speed gear-driven motor platform for higher volumetric output).

• M: Mechanical gear motor drive assembly.

• 5: #5 Santoprene Pump Tube (high-output, low-pressure tube assembly).

• ADJ: Mechanically adjustable output (dial ring graduated from L to 10).

• 25PSI: Low-pressure rating (up to 25 PSI / 1.72 bar), matched to high-flow, low-head commercial pool filtration returns.

• 85GPD: 85.0 US Gallons Per Day maximum output capacity (~3.54 GPH / ~13.4 LPH).

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

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

Mechanical Architecture & Turndown Mechanics

• Mechanical Feed-Rate Control Ring: Situated between the gear motor and the pump head, the indexing control ring incorporates a cam clutch mechanism graduated from L (5%) to 10 (100%) in 2.5% increments:

  • At setting 10, the roller assembly turns continuously throughout the cycle (100% capacity, 85 GPD).

  • At lower dial settings, the internal drive pawl selectively disengages the roller assembly during segments of each rotation, delivering positive mechanical turndown down to 4.3 GPD (5%).

• Peristaltic Positive Displacement: A three-roller planetary carrier continuously pinches the flexible Santoprene tube flat against the curved track. This positive mechanical occlusion maintains a constant seal, providing self-priming lift up to 25 vertical feet and natural anti-siphon protection without relying on spring-loaded backpressure valves.

• Vapor Lock & Gas Immunity: Easily handles off-gassing oxygen ($O_2$) from 12.5%–15% sodium hypochlorite and fuming hydrochloric acid vapors ($HCl$). Gas bubbles are compressed and pumped directly through the discharge tubing without loss of prime or air-binding.

• Zero Chemical Contact: Process fluids only contact the inner bore of the Santoprene tube, polyethylene delivery tubing, and duckbill check valve quill, isolating motor windings and drive gears from aggressive chemicals.

Technical Specifications

• Max Output Capacity: 85.0 GPD (approx. 3.54 GPH / 134.1 mL/min / 321.8 L/day) at 25 PSI.

• Turndown Range: 4.3 to 85.0 GPD (5% to 100% capacity via mechanical dial).

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

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

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

• Suction / Discharge Plumbing: 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; runtime controlled via powered chemical feed relays or low-voltage auxiliary interlocks on Pool Link controllers.

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

Maintenance & Wear Components

• Santoprene Tube Service Life: Plan for replacement every 500 to 1,000 operating hours (or seasonally every 3 to 6 months in heavy commercial waterparks or natatoriums).

• Roller Assembly Lubrication: Apply Stenner silicone lubricant to the inner pump head housing and roller wheels during each tube change to prevent friction wear and tube creep.

• Duckbill Injection Check Valve: Inspect annually for calcification, swelling, or chemical hardening at the pipe injection tap.

Weight and Logistics Profile

• Net Unit Weight: Approximately 7.6 to 8.4 pounds (approx. 3.45 to 3.81 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 10.0 to 11.0 pounds (approx. 4.54 to 4.99 kg), including:

  • 20-foot roll of 3/8" White UV-resistant PE tubing.

  • 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).