STENNER 85MP5 PUMP FX 25PSI 85GPD 120V/60HZ 3/8W

The Stenner 85MFL5A3SUAA (85 Series Classic Fixed Rate) is an industrial-grade, peristaltic positive displacement chemical metering pump engineered for high-pressure injection in commercial aquatic automation, water treatment, and municipal chemical feed applications.

Operating on a fixed-rate duty cycle, it delivers 40.0 GPD (Gallons Per Day) against system head pressures up to 100 PSI (6.9 bar). In commercial aquatic mechanical rooms running Pool Link 500/1000 Series controllers, this model is typically selected when injecting chemicals (such as 12.5% to 15% liquid sodium hypochlorite or 31.45% muriatic acid) into deep pool recirculating mains, multi-story risers, or filtration loops where return pressures exceed the 25 PSI limit of the 45 Series.

Nomenclature & Smart-Part Model Breakdown

• 85: Stenner 85 Series platform (high-speed gear-driven motor assembly for higher volumetric throughput against pressure).

• M: Mechanical gear motor drive assembly.

• FL: Fixed-rate output (100% duty cycle when energized; flow throttling managed externally by automation controller pulse/relay cycles).

• 5: #5 Santoprene Pump Tube (rated for high-pressure service up to 100 PSI).

• A: 120V AC, 60 Hz electrical power specification.

• 3: 3/8" Outer Diameter (OD) suction and discharge connections.

• S: Santoprene tube material (standard chemical-grade elastomer for chlorine, acids, and basic pool chemicals).

• U: UV-resistant white polyethylene tubing included.

• AA: Standard commercial packaging configuration with complete accessory kit (tubing, injection check valve, weighted suction strainer, and mounting bracket).

Mechanical Architecture & High-Pressure Operation

• Reinforced High-Pressure Roller Drive: Unlike the 25 PSI variants, the 85 Series high-pressure roller assembly is calibrated to maintain tube pinch occlusion against up to 100 PSI (6.9 bar) of hydrostatic backpressure, preventing pressurized pool water from pushing back into the chemical reservoir.

• Continuous Peristaltic Positive Displacement: Three-roller planetary gear carrier continuously traps fluid inside the Santoprene pump tube. Fluid movement is strictly positive displacement—preventing siphoning without requiring external spring-loaded backpressure valves, and maintaining a self-priming suction lift up to 25 vertical feet.

• Vapor Lock & Gas Handling: Bypasses the gas-binding issues common to electronic diaphragm pumps. Dissolved off-gassing oxygen from liquid bleach ($O_2$) and fuming hydrochloric acid vapors ($HCl$) pass through the peristaltic tube without disrupting prime.

• Complete Isolation: Wetted chemistry contacts only the inner wall of the Santoprene tube, polyethylene feed line, and duckbill injection check valve, shielding motor windings and drive gears from chemical corrosion.

Technical Specifications

• Output Capacity: 40.0 GPD (approx. 1.67 GPH / 63.1 mL/min / 151.4 L/day) at 100 PSI.

• Maximum Discharge Pressure: 100 PSI (approx. 6.89 bar).

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

• Turndown Ratio: Fixed output (100% capacity when powered); runtime modulated via dry-contact or powered relay outputs from Pool Link 500/1000 controllers.

• Pump Tube Assembly: #5 High-Pressure Santoprene Tube (Part No. MCCP205 / UCCPM05).

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

• Suction Lift: Up to 25 ft (approx. 7.6 m) vertical water lift.

• Fluid Operating Temperature Limits: Up to 104°F (40°C); max ambient air temperature 104°F (40°C).

Tube Output Comparison (85 Series @ 100 PSI)

Maintenance & Service Wear Parts

• Santoprene Tube Service Interval: Replace every 500 to 1,000 run hours (or seasonally every 4 to 6 months in 24/7 commercial operations).

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

• Duckbill Injection Check Valve: Inspect annually for calcification, swelling, or hardening. Install the injection quill directly into the center of the recirculating pipe line to prevent acid pitting along the pipe wall.

Weight and Logistics Profile

• Net Unit Weight: Approximately 7.8 to 8.5 pounds (approx. 3.54 to 3.86 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 10.2 to 11.2 pounds (approx. 4.63 to 5.08 kg), complete with accessory kit:

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

  • Weighted ceramic suction strainer / foot assembly.

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

  • Wall-mount steel bracket, spare tube, and quick-latch clips.

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