Peristaltic pumps work by reduction of a volume within a tube by a series of rollers.

	Flows from 0.18 ml/min - 2.9 l/min
	Dry Running
	Self priming
	Reversible (DC)
	Low maintenance
	Excellent for use with viscous or aggressive media

Technical Overview
Peristaltic pumps operate using positive displacement. The fluid is forced through tubing by a number of rollers, which rotate squeezing a flexible tube against the pump housing. As the roller moves over and past a point on the tubing it expands to allow more fluid to enter. During operation there is at least one of the rollers in contact with the tubing at all time which therefore eliminates the need for valves to prevent backflow. The rollers or roller carriers are turned in the housing either directly by the motor or by a small gearbox which can alter the number of revolutions per minute. If the pump is direct driven increasing or decreasing the motor speed can control the flow. Peristaltic pumps are ideal for use with corrosive and viscous fluids as the only part of the pump to come into contact with the fluid is the tubing. With the tubing or the head being easily replaced the pumps are relatively maintenance free.

Rietschle Thomas has 5 sizes of pump with flows ranging from 0.18ml/min up to 2900ml/min. Various tube materials are available depending on their compatibility with the media being transferred. Each of the 5 sizes are available in AC or DC (DC pumps are also reversible) and are self-priming.