Desaired(Shanghai) Instrument Equipment Co., Ltd.

No warranty, but DISRAD dispersion tools enjoy one year of free maintenance service. As high-precision components, natural wear occurs after long-term use.

Yes, DISRAD dispersion tools adopt a modular design, allowing each component to be purchased separately, especially the stator and rotor. There is no need to replace the entire tool, saving costs.

The replacement interval for the PTFE bushing depends on the frequency of use. Once wear is found (typically when the inner diameter becomes larger), it must be replaced immediately and cannot continue to be used, otherwise the stator and rotor in the dispersion tools may be damaged. Alternatively, copper/ tungsten carbide metal bushings can be selected for the Series-C, which are maintenance free.

The flowable medium needs to lubricate the bearing system below the circulation hole and continuously form a water film to reduce friction and provide cooling, avoiding excessive wear and heat generation caused by the PTFE bushing running dry.

Before starting operation, the sample liquid should at least cover the bottom circulation hole of the tool. During operation, avoid direct contact between the bottom circulation hole and air, while also preventing the upper overflow port from being completely submerged.

A serrated dispersion tool with a diameter of Ø14 mm is recommended. The serrated stator and two tooth rotor provide stronger shearing force. Container size, liquid height, and other factors should also be considered.

It is normal to have a slot (crack) in the PTFE bushing; it is not a defect. As part of the bearing system, the flowing medium enters through this slot into the space between the shaft (rotating shaft) and the PTFE bushing, generating high speed self lubrication, reducing frictional resistance and providing cooling.

No. Typically, particle size will not further decrease after continuous processing beyond 15 minutes. Only heat (due to friction) is transferred to the medium, causing the sample temperature to rise continuously.

This is caused by friction and heat generation when the PTFE bushing runs dry during high speed operation. Pay attention to the following:
a. Ensure the sample is a flowable medium that can wet the PTFE bushing and provide lubrication.
b. During operation, the liquid level must completely immerse the bottom circulation hole to ensure adequate lubrication inside the PTFE bushing.
c. After the experiment, the tool assembly must be cleaned promptly, especially residues inside the PTFE bushing and in the slot.

First, check whether the dispersing tool is installed correctly: it must be inserted fully to the top of the drive interface and the fixing nut must be tightened firmly. Next, check whether the PTFE bushing inner diameter is severely worn; check the inner side of the stator and the outer side of the rotor for signs of wear. If wear is found, replace immediately; otherwise, the service life of the coupling, bearings, and motor may be shortened.

Yes. DISRAD dispersion tools are made of AISI 316L stainless steel and special PTFE. The tools support chemical sterilization, moist heat sterilization (autoclaving), and dry heat sterilization. (Refer to the operation manual for details.)

A disperser generally consists of a drive, dispersion tools, and a stand. The core part is the dispersion tools, which directly affect the sample processing result.

The typical service life is about 10 years. Due to natural decay of the magnetic material in the motor stator and rotor, oxidation of copper coils, bearing wear, etc., the actual lifespan should be evaluated based on factors such as operating environment, frequency of use, and maintenance schedule. DISRAD original imported models come with a three-year warranty. Extended warranty service is also available for longer peace of mind. In addition, DISRAD offers lifetime paid repair services, for which parts and labor costs are charged.

Abnormal noise may be caused by improper installation of the dispersion tool, carbon brush wear, PTFE bushing wear, or other component wear. The relevant parts should be checked and replaced promptly.

Overheat protection. When samples are processed for a long time, the motor may overheat. A PTC temperature sensor embedded in the motor stator winding monitors the motor temperature in real time. When the temperature is too high, the control system immediately reduces the speed and activates cooling measures to effectively protect the motor.

Both are equally accurate. Both types of dispersers have built-in microprocessors and adopt load constant speed technology, which responds in real time to changes in sample viscosity and maintains constant speed, ensuring high repeatability of experimental results. The dial type speed controller has a stepping value of 200 rpm. The digital display drive shows the speed value more intuitively.

It is recommended to choose a tall container with a small diameter. A four leaf clover shape is preferred to reduce vortexing. Using a container with a sealed lid helps prevent sample splashing. Also, the dispersion tool should be placed off center in the container.

An electric stand is available, especially suitable for heavy mixing equipment or applications requiring frequent height adjustments, as well as for operation in confined spaces such as fume hoods or biosafety cabinets. It greatly improves convenience and flexibility.

Load constant speed means that when the load changes, the drive can still maintain a constant speed. In other words, when the sample viscosity changes, the rotational speed remains constant, effectively ensuring the repeatability and accuracy of experimental results.