Longer Pump — Precision Peristaltic and Syringe Pumps

Selecting Longer Peristaltic Pumps for Lab and Process Workflows

Baoding Longer Precision Pump Co., Ltd. (a Halma company) manufactures precision fluid transfer and metering systems. Choosing the right pump requires evaluating flow rates, chemical compatibility of fluid with tubing, allowable pulsation, and ambient conditions.

For laboratory research and cell culture feeds, benchtop drives such as BT100-2J, BT300-2J, and BT100-1L provide smooth stepper speed control, low acoustic noise, and precise calibration.

For pharmaceutical packaging and chemicals, the WT600 industrial series features IP65-rated 304 stainless steel housings, high torque motors, and washdown protection.

Comparing Peristaltic Pump Heads: Versatile YZ Versus Multichannel DG

The pump head is the core mechanical element of peristaltic pumping. Longer YZ1515x and YZ2515x easy-load pump heads use an ergonomic lever mechanism allowing tubing changeovers in seconds without disconnecting liquid plumbing lines.

The YZ1515x accepts 1.6 mm wall tubing, while the YZ2515x handles 2.4 mm wall tubing for viscous media.

For analytical workflows requiring parallel fluid lines, DG series cartridge pump heads (DG-1 through DG-12) accommodate up to 12 channels. Fitted with 6 or 10 stainless steel rollers, DG heads eliminate micro-pulsations and maintain uniform flow rates down to 0.00016 mL/min per channel.

Fluid Tubing Selection: Saint-Gobain PharMed BPT, Silicone, and Polymers

Flow accuracy and operational life depend on selecting the correct elastomeric tubing. Saint-Gobain PharMed BPT tubing offers excellent peristaltic fatigue life, exceeding 1,000 continuous hours under cyclic roller compression, making it a standard for biopharmaceutical fluid transfers.

For sterile single-use systems, platinum-cured silicone provides low extractables and non-toxic contact surfaces. For harsh organic solvents and concentrated acids, we configure chemically inert tubing grades including Norprene Chemical, Fluran, and Tygon fluoroelastomers.

Longer LSP Laboratory Syringe Pumps: Nanoliter Infusion Profiles

Longer LSP precision syringe pumps (LSP01-1A, LSP02-1B, LSP04-1A, LSP08-1A, LSP10-1B) deliver pulseless fluid injection for mass spectrometry, microfluidics, and animal infusions. Instruments support racks holding 1 to 10 glass or stainless syringes from 0.5 µL up to 140 mL.

Driven by microstepping motors and precision lead screws, the pusher travels smoothly at linear rates between 4.7 µm/min and 60 mm/min with travel error under 0.5%. Users can program delivery routines including infusion, withdrawal, continuous cycling, and gradient sequences.

Embedded OEM Syringe Modules L0107 and SP for Clinical IVD Systems

Longer L0107 and SP series (SP60, SP120) embedded syringe pump modules are designed for automated IVD diagnostic instruments, clinical analyzers, and liquid handling robotic arms.

Featuring drive resolutions up to 12,000 steps per full stroke, they meter sub-microliter samples with a coefficient of variation below 0.5%. Modules integrate multi-port ceramic or PTFE rotary valves (3 to 8 ports) and support serial communication over RS232, RS485, and CAN-bus.

WT3000 Magnetic Micro Gear Pumps and Automated DF600 Filling Lines

Longer WT3000 micro gear pumps utilize magnetic couplings that eliminate mechanical shaft seals, ensuring leak-free operation up to 0.8 MPa differential pressure. Designed for pulseless continuous dosing, they handle fluid temperatures from -45°C up to +120°C.

For commercial liquid packaging, DF600 and F6-32L multichannel dispensing systems automate vial, bottle, and ampoule filling. An intelligent programmable anti-drip drawback function prevents droplet formation at nozzles, ensuring clean container sealing and dosing accuracy within 1%.

Digital Network Integration and Automation: Modbus RS485 Protocol

Modern automated plants require seamless supervisory control. Longer peristaltic pump drives feature RS485 serial ports supporting the standard Modbus RTU communication protocol, allowing up to 32 drives to be addressed on a single bus by a PLC or industrial PC.

For hardwired process interfaces, Longer units provide galvanically isolated digital inputs for remote start, stop, and direction switching, as well as analog input signals (0–5 V, 0–10 V, 4–20 mA) for continuous rotational speed control proportional to external sensors.

Calibration Procedures and Tubing Wear Volumetric Compensation

Over prolonged pumping cycles, continuous elastomeric deformation slightly alters internal tubing cross-section and dynamic elasticity. Longer drives incorporate automated volume and weight calibration routines accessible through the digital operator interface.

The operator runs a measured dispensing cycle, enters the actual dispensed weight or volume from an analytical balance, and the pump microprocessor automatically recalibrates motor step multipliers, storing updated parameters in non-volatile memory.

Preventive Maintenance Routines and Pump Head Service Guidelines

Sustaining peak dispensing precision requires routine inspection of pump head rollers and guide tracks. Operators should inspect YZ and DG roller assemblies for fluid residue, ensuring that stainless steel bearings rotate freely without binding.

Tubing segments should be shifted forward by 10 to 15 cm at scheduled intervals to distribute fatigue wear across fresh sections, or replaced according to runtime limits. Pivot levers and occlusion mechanisms should receive occasional light lubrication with high-purity silicone lubricant.