Why choose a peristaltic pump instead of a syringe or diaphragm pump?

A peristaltic pump moves liquid by squeezing a flexible tube with rotating rollers, so the fluid only ever touches the inside of the tube. That single design decision explains most of its value: nothing in the pump body is wetted, so there is no cross-contamination between samples, no seals or valves to clog, and the wetted path can be replaced in seconds by changing the tubing. Peristaltic pumps handle suspensions, slurries and viscous media that would block a diaphragm or piston pump, they can run dry without damage, and they are easy to sanitise because the tubing is disposable. The trade-off is lower pressure capability, gentle pulsation in the flow, and tubing that is a consumable item with a finite life. For dosing, transfer, cell-culture media handling and sampling, that balance usually favours the peristaltic design.

How do I match flow rate, tubing bore and pump speed?

Flow is proportional to tubing bore and to rotational speed, so decide your target flow first and then choose the tube that reaches it in the comfortable middle of the speed range. Running a small-bore tube at maximum speed causes premature wear and inaccurate dosing; running a wide tube at minimum speed gives poor resolution. As a working guide, a 1.6 millimetre internal diameter tube on a variable speed pump typically covers roughly 0.5 to 30 millilitres per minute, a 3.2 millimetre bore covers about 2 to 120 millilitres per minute, and a 4.8 millimetre bore reaches several hundred millilitres per minute. Viscous liquids reduce the achievable flow and increase the pressure the pump must overcome, so select one tube size up and accept a lower speed. Calibrate the actual delivered volume in your own tubing and liquid before you trust a set point, because wall thickness and tube age both shift the output.

Which tubing material should I use?

Choose the tubing for chemical compatibility first and pumping life second. Silicone is the general-purpose choice: very flexible, low cost, good for aqueous solutions and biological media, autoclavable, but it swells in many solvents and its flow drifts as it fatigues. Norprene and similar thermoplastic elastomers give the longest pumping life and are the default for continuous duty and for solvents where silicone fails. Tygon or PVC formulations suit general reagent transfer and are clear for visual inspection. Viton or fluoropolymer tubing is specified for aggressive solvents, acids and oxidisers, at higher cost and with stiffer handling. Platinum-cured silicone is the standard for cell culture and pharmaceutical work because it releases fewer extractables. Whatever you choose, keep the grade consistent: a change of tubing material changes both the flow calibration and the extractables profile of everything you pump.

What does JWRESEARCH supply for peristaltic pumping in Singapore?

JWRESEARCH supplies laboratory peristaltic pumps in Singapore as single and multichannel units, from compact fixed-speed transfer pumps to variable speed and programmable dosing models with reversible direction, remote control and dispensing heads. We pair each pump with the correct tubing: silicone, platinum-cured silicone, Norprene, Tygon and fluoropolymer grades in the standard wall thicknesses and bore sizes, plus replacement pump heads, rollers, clamps and fittings. We can build a complete flow path for a specific application, help you calibrate a dosing set point, and hold consumable tubing stock for local replenishment so a worn tube never stops a run.

Peristaltic Pumps Singapore

Published: {{NEW_ARTICLE_DATE}} | By JWRESEARCH | Category: Laboratory Equipment

A peristaltic pump is the quiet workhorse behind a lot of laboratory work: feeding media to a bioreactor, dosing reagent into a titration, sampling from a vessel that must not be opened, or simply moving a suspension that would destroy an ordinary pump. Because the fluid only touches the inside of a flexible tube, the pump never has to be cleaned between samples — you change the tube and carry on.

At JW RESEARCH SUPPLY, we supply laboratory peristaltic pumps and tubing to research groups, contract laboratories and industrial customers across Singapore. This guide covers the pump types, how to match flow to tubing, dosing accuracy and the maintenance rules that keep a pump honest.

How a Peristaltic Pump Works

Rollers mounted on a rotating head compress the tube progressively, pushing a slug of liquid ahead of each roller while the tube behind it recovers and refills. Nothing else in the system is wetted: no valves, no seals, no impeller. That gives three practical advantages — no cross-contamination between samples, tolerance of suspensions and slurries, and the ability to run dry without damage. The cost is gentle pulsation in the flow, modest pressure capability, and tubing that wears and must be replaced on a schedule.

Pump Types Compared

Type	Typical Flow Range	Channels	Best For
Fixed-speed transfer pump	≈ 10 – 300 mL/min	1	Simple media and reagent transfer
Variable speed pump	≈ 0.1 – 500 mL/min	1 – 2	Adjustable flow, perfusion and recirculation
Multichannel pump	≈ 0.01 – 100 mL/min per channel	4 – 12	Parallel dosing, plate work, media preparation
Programmable dosing pump	≈ 0.001 – 200 mL/min	1 – 4	Timed or volume-based dispensing, calibration routines
Micro peristaltic pump	≈ 0.001 – 10 mL/min	1 – 8	Microfluidics, droplet work, low-flow sampling

Specification Reference

Parameter	Typical Value	Notes
Tubing internal diameter	0.5, 0.8, 1.6, 3.2, 4.8, 6.4, 8.0 mm	Flow scales with bore; 1.6 and 3.2 mm cover most bench work
Tubing wall thickness	1.6 mm or 2.4 mm	Must match the pump head; mismatched wall ruins flow accuracy
Speed range	≈ 1 – 300 rpm	Low-speed resolution matters more than peak speed
Max pressure	≈ 1 – 3 bar	Well below a diaphragm pump; plan the flow path accordingly
Dosing accuracy	≈ ± 1 – 3 % after calibration	Verify in your own tubing, liquid and speed setting
Tubing life	≈ 50 – 1000 hours depending on material and speed	Norprene longest; silicone shortest and cheapest

Matching Flow to Tubing and Speed

Flow is the product of bore and rotational speed, so pick the target flow first and then choose a tube that reaches it in the comfortable middle of the speed range. A bore that needs full speed to hit your set point will wear out fast and dose unevenly; a very wide bore crawling at minimum speed gives you no fine control. As a starting guide, 1.6 millimetre bore spans roughly 0.5 to 30 millilitres per minute, 3.2 millimetre bore about 2 to 120 millilitres per minute, and 4.8 millimetre bore several hundred millilitres per minute. Viscous liquids lower the achievable flow and raise the pressure the pump must overcome, so step up one bore size and accept a lower speed.

Tubing Materials at a Glance

Material	Chemical Range	Pumping Life	Typical Use
Silicone	Aqueous, biological; poor with solvents	Short to moderate	General media and reagent transfer, autoclavable
Platinum-cured silicone	Aqueous, biological	Moderate	Cell culture and pharmaceutical work, low extractables
Norprene / TPE	Broad, including many solvents	Longest	Continuous duty, perfusion, industrial transfer
Tygon / PVC	General reagents and buffers	Moderate	Clear tubing where visual inspection helps
Viton / fluoropolymer	Aggressive solvents, acids, oxidisers	Moderate to long	Harsh chemistry, at higher cost

Calibration and Dosing Accuracy

A pump is only as accurate as its last calibration. Set the pump to deliver into a tared vessel for a fixed time at your working speed, weigh the delivered liquid, convert using density, and repeat three times. Then adjust the set point by the average ratio. Because output falls steadily as the tube fatigues, calibrate when the tube is new, log the value, and repeat at a fixed interval — weekly for critical dosing, monthly for general transfer. Better still, log the calibration so a shift in delivered volume is the signal to replace tubing rather than a mystery in your results.

Maintenance and Practical Rules

Match the tubing wall thickness to the pump head; a mismatched wall changes flow and can slip.
Move the tube a few centimetres along the head when you can, to spread roller wear.
Replace tubing on a schedule, not when it fails — a cracked tube leaks into the head, not just onto the bench.
Keep the head rollers clean and check for flat spots; a seized roller abrades the tube fast.
Never pump a liquid past the tube's chemical rating, even briefly — swelling is permanent.
Mount the pump above the reservoir where possible so it does not have to prime against a siphon.

Ordering Checklist

Target flow rate and the range you need to adjust within
Number of channels and whether they must run independently
Dosing accuracy and whether timed or volume-based dispensing is required
Tubing material for your chemistry, plus spare tubing of the same grade
Tubing bore and wall thickness matched to the pump head
Replacement pump head, rollers and clamps so a worn part never stops a run

Tell us what you are pumping, the flow you need and how often the pump will run, and we will specify the pump head, tubing grade and spare set that fits the job, with local delivery in Singapore and consumable tubing held in stock.

Contact JWRESEARCH

JW RESEARCH SUPPLY — laboratory equipment and consumables, Singapore.
Telephone / WhatsApp: +65 8039 3660
Email: SINGAPORE@JWSHY.COM
Website: www.jwresearch.cn