Jessberger Lab Pump Set JP-125 PP SC for Chemicals

The JP-125 PP SC delivers the same chemical-resistant lab pump capability as the JP-125 PP — but adds a speed control dial on the motor, allowing the operator to continuously vary the flow rate from near-zero up to 20 l/min. Where a fixed-speed pump demands nozzle throttling for dosing control, the SC version lets you set the motor speed directly, freeing the nozzle hand and delivering a steadier, more consistent flow for filling and dosing tasks.

When speed control matters

Fixed-speed lab pumps work well for bulk transfers where flow rate is irrelevant. But when filling receptacles of varying volume, dosing into reaction vessels or dispensing viscous media that behaves differently at different flow velocities, speed control gives the operator a meaningful second axis of control. The dial adjusts continuously — there are no preset steps — so output can be matched precisely to what the task requires rather than managed downstream at the nozzle.

How it works in practice

The JP-120 motor with integrated speed control drives a Hastelloy shaft connected to an axial impeller at the base of the pump tube. The 700 mm tube length is sized for IBCs and tall narrow-neck drums. The motor attaches to the container neck via the connection thread G 1", and the Ø 25 mm tube fits containers with an inner opening from approximately 28 mm upward. The 2 m PVC hose connects to the ½" (DN 13) outlet. The PP nozzle allows one-handed dispensing with the trigger as a secondary on/off, while motor speed is set independently.

Key features

• Speed control dial — continuously variable flow rate from near-zero to 20 l/min without nozzle adjustment
• Hastelloy (HC) drive shaft — handles highly aggressive media that stainless steel cannot withstand
• PP pump tube Ø 25 mm — chemical resistance up to 50°C for acids, alkalis and detergents
• 700 mm tube length — suited to IBCs and tall narrow-neck drums
• Low voltage release switch — prevents uncontrolled restart after power failure
• Thermal motor protection — extends motor life under continuous or high-viscosity loads
• 2 m PVC hose and PP nozzle included — no additional accessories required to begin operation

Certification & Approvals

• Protection class IP 24
• Double insulated, category II
• CE marked

Technical Specifications

• Motor: JP-120 with speed control, 230 V, 50/60 Hz, 250 W
• Protection class: IP 24
• Drive shaft: Hastelloy 2.4610 (HC)
• Pump tube material: Polypropylene (PP)
• Pump tube outer diameter: Ø 25 mm
• Connection thread: G 1"
• Hose connection: ½" (DN 13)
• Hose included: 2 m PVC hose ½"
• Nozzle included: PP ½", FKM seal
• Flow rate: Up to 20 l/min (variable)
• Head: 5 m
• Max. temperature: 50°C
• Max. viscosity: 200 mPas
• Max. density: 1.2
• Pump tube length: 700 mm
• Cable length: 5 m with plug

Applications

• Precise dosing of acids and alkalis into reaction vessels
• Controlled filling of small receptacles from IBC containers
• Laboratory dispensing where flow rate must match vessel capacity
• Pharmacy and chemical analysis — small-volume transfer with flow control
• Water treatment — metered transfer of treatment chemicals
• Agriculture — controlled dispensing of liquid fertilizers

Operational Requirements

• The impeller must be fully submerged during operation — do not run the pump dry
• Maximum medium temperature: 50°C — do not exceed with PP tube
• Maximum viscosity: 200 mPas — for higher viscosity, consider the JP-128 or JP-132 series
• Container inner opening must accommodate Ø 25 mm tube
• Not suitable for flammable liquids without ATEX-rated equipment