Tongtian TBP-50A Constant Flow Piston Pump

Overview

The Tongtian TBP-50A Constant Flow Piston Pump is an engineered solution for precise, pulse-minimized, and chemically resistant liquid delivery in mid-pressure laboratory applications. Based on dual-plunger positive displacement architecture, it operates via microprocessor-controlled stepper motor actuation—ensuring stable volumetric displacement per stroke and high reproducibility across variable backpressures. Unlike peristaltic or diaphragm pumps, the TBP-50A delivers true constant flow independent of fluid viscosity or system resistance within its operational envelope (0.1–50 mL/min at up to 10 MPa). Its core design adheres to fundamental principles of Couette flow dynamics and laminar displacement mechanics, enabling accurate mass transfer in chromatographic elution, catalytic reaction feeding, and continuous extraction workflows. The pump is not intended for ultra-high-pressure applications (>10 MPa) or gas-phase delivery but excels where long-term stability, solvent compatibility, and low pulsation (<1.5% peak-to-peak amplitude under typical HPLC load conditions) are critical.

Key Features

• Dual-piston synchronized drive system with active mechanical dampening—reducing flow pulsation to ≤1.5% peak-to-peak deviation at full scale
• Chemically inert wetted path comprising sapphire pistons and check valves, 316L stainless steel pump head, zirconia ceramic seals, and PTFE/filled-PTFE gaskets—validated for compatibility with acetonitrile, THF, DMF, dichloromethane, concentrated HCl (up to 37%), NaOH (up to 50% w/w), and hydrogen peroxide solutions
• Microcontroller-based flow calibration routine—enabling density-compensated volumetric correction for solvents ranging from hexane (ρ = 0.66 g/mL) to glycerol (ρ = 1.26 g/mL)
• Adjustable overpressure protection with programmable cut-off threshold (default set at 10 MPa, user-configurable down to 0.5 MPa)
• Four-digit LED flow display with real-time feedback and keyboard-based parameter entry—supporting rapid setup without external software dependency
• Integrated vibration isolation mounts and acoustic damping housing—achieving sound pressure levels <48 dB(A) at 1 m distance during continuous operation
• Modular service design—standardized sapphire components (pistons, balls, seats) allow field replacement without specialized tools or recalibration

Sample Compatibility & Compliance

The TBP-50A accommodates a broad spectrum of liquid samples including organic solvents, aqueous buffers, corrosive reagents, and biologically active formulations. Its titanium-alloy and super-austenitic stainless steel (00Cr17Ni14Mo2) variants—available upon request—extend compatibility to aggressive halogenated media and hot alkaline wash solutions. All standard configurations meet ISO 9001 manufacturing traceability standards and support audit-ready documentation for GLP and GMP environments. While not certified to FDA 21 CFR Part 11 out-of-the-box, the pump’s RS-232/USB interface enables integration with validated LIMS or CDS platforms that implement electronic signature, audit trail, and data integrity controls per ALCOA+ principles. It complies with electromagnetic compatibility requirements per IEC 61326-1 and safety standards per IEC 61010-1 for laboratory electrical equipment.

Software & Data Management

The TBP-50A supports bidirectional serial communication (RS-232 default; USB-to-serial adapter optional) for remote configuration and monitoring via ASCII command protocol. A lightweight Windows-compatible terminal utility is provided for firmware updates, flow calibration logging, and pressure event history export (CSV format). When integrated into chromatography data systems (e.g., Waters Empower, Thermo Chromeleon), it functions as a peripheral device with status polling capability—reporting real-time flow rate, actual pressure, motor temperature, and fault codes. All calibration parameters—including viscosity compensation coefficients and pulse correction offsets—are stored in non-volatile memory with write-protection logic to prevent accidental overwrite during power cycling.

Applications

• HPLC and flash chromatography mobile phase delivery—particularly where gradient delay volume minimization and baseline stability are essential
• Continuous-flow synthesis reactors requiring stoichiometric reagent dosing under elevated backpressure (e.g., hydrogenation, ozonation, photochemical transformations)
• Extraction systems (SFE, ASE, PLE) operating with CO₂-modified solvents or polar organic mixtures
• Bioprocessing auxiliary lines—feeding pH adjusters, antifoam agents, or nutrient stocks into bioreactors while maintaining sterility via upstream filtration
• Environmental sample preparation—automated leaching, digestion, and dilution protocols compliant with EPA Method 3050B and ISO 11466
• Materials science slurry dispensing for thin-film coating, catalyst impregnation, and battery electrode fabrication

FAQ

What is the maximum allowable inlet pressure for the TBP-50A?

The pump is designed for atmospheric or slightly pressurized inlet conditions (0–0.2 MPa gauge). Positive inlet pressure exceeding 0.3 MPa may compromise check valve sealing integrity and is not recommended.

Can the TBP-50A be used with viscous fluids such as polymer solutions?

Yes—within limits. Fluids with dynamic viscosity up to 500 cP at operating temperature can be delivered reliably at reduced flow rates (≤10 mL/min); viscosity compensation must be enabled during calibration.

Is the pump suitable for sterile or aseptic applications?

The standard configuration is not autoclavable. However, optional PEEK or titanium-wetted-path versions (TBP-K/TBP-T series) support SIP (steam-in-place) at ≤121°C for 30 minutes when paired with appropriate elastomer selection (e.g., EPDM-free Kalrez® seals).

Does the TBP-50A support gradient formation?

No—the TBP-50A is a single-channel constant-flow unit. For binary or ternary gradients, the Grad-series dual-pump system (also manufactured by Tongtian) is required to ensure precise mixing ratio control and minimal dwell volume.

How often does the pump require maintenance under continuous operation?

With proper solvent filtration (≤0.45 µm pre-filtering) and avoidance of particulates, sapphire components typically exceed 5,000 hours of service life. Routine inspection of PTFE seals and valve seating is advised every 500 operational hours.