Quick Tips
hettich service

Hettich Service
Quick Tips



Select a "quick tip" below.







Removal of the packaging

Remove all strapping from the carton. Lift the carton upward and remove the padding. Refer to the specifications of your product for the dimensions and weight of the unit before trying to lift out of the packaging by yourself. Do not lift the centrifuge by the front panel. Lift the centrifuge on both sides with an appropriate number of people necessary for the weight of the unit and place it on the laboratory table. Please make room ahead of time before lifting for some units may be heavy and hard to maneuver. See Installing centrifuge on a strong, stable base.



bolt removal

remove
Removal of transport bolts

Instructions for removing the transport bolts can be found inside the centrifuge chamber. Once you have unpacked your centrifuge and have placed the centrifuge in the proper location plug in the power cord and turn the power on. Press the open key to open the lid and retrieve the instructions.

All Hettich centrifuges ship with transport bolts that hold the motor in place. The bolts can be found by locating the red plastic guards that are underneath the unit or that are located inside the chamber of the unit. The red plastic gaurds are used as a visual guide. The actual bolts that hold the gaurds in place need to be removed. If un-removed the centrifuge will make a loud noise and not operate properly. In some units the guards will cause the unit to sit uneven.



Installing centrifuge on a strong,
stable base

Centrifuges come in a variety of shapes, sizes and weights. Some units can weigh as much as 350lbs when fully loaded with the rotor, buckets, adapters and media. Over time this can cause an unsecure table or unsteady work surface to become weak and in return become a safety hazard in your lab. To avoid any issues, please make sure your unit is installed on a bench or work surface that can support the weight of your centrifuge and any other equipment you have on the same surface.
Typically most lab benches in hospitals and research facilities can support the product just fine. Centrifuges should have a minimum of 12” around all sides of the unit.

Hettich also offers a variety of one (1) and two (2) draw centrifuge cabinets that can be used as a base for your centrifuge. These cabinets are ideal because they free up bench space, have wheels so you can move your centrifuge around the lab or out of the way (if necessary) and also, the cabinets raise the centrifuge to the proper height for loading and unloading your samples. Find out more by visiting the Hettich Rolling Cabinets section.

Registration

Your safety is most important to us. In order for us to effectively communicate with you should an important warranty recall or safety notice need your attention, you must register. By registering we will have all the data necessary to inform you immediately should the need arise. You can register your product online at https://www.hettweb.com/registration.html.

Free space around unit

Position the centrifuge in a stable and level manner in a suitable place (see Installing centrifuge on a strong, stable base). During set-up, the required safety margin of 300 mm (1 ft) around the centrifuge is to be kept according to EN / IEC 61010-2-020. When the centrifuge is running, according to EN / IEC 61010-2-020, no persons, dangerous substances or objects may be within the safety margin of 300 mm (1 ft) around the centrifuge. Do not place any object in front of the ventilation duct. Keep a ventilation area of 300 mm (1 ft) around the ventilation duct.

Opening and closing the lid

Opening the lid. The lid can only be opened when the centrifuge is switched on and the rotor is at rest. Press the button OPEN/STOP. The lid unlocks via the motor and the left LED in the pushbutton OPEN/STOP extinguishes. If it cannot be opened under these circumstances, see the section on “Emergency release”.

Closing the lid. Do not put your fingers between lid and housing. Do not bang the lid shut. If the left LED in the OPEN/STOP button flashes, press the OPEN/STOP button so that the motor-driven lid lock goes into the basic position (opened). Place the lid and lightly press down the front edge of the lid. The locking action is effected by motor. The left LED in the button OPEN/STOP lights up.






Installing the rotor

Before using the centrifuge make sure the rotor has been installed correctly and is sitting firmly and evenly on the motor shaft.

To install the rotor, clean the motor shaft (C) and the rotor drilling (A), and lightly grease the motor shaft. Place the rotor vertically on the motor shaft. The motor shaft dog (D) has to fit in the rotor slot (B). The alignment of the groove is labeled on the rotor. Tighten the rotor tension nut with the supplied wrench by turning in a clockwise direction. Check the rotor for firm seating.

To loosen the rotor: Loosen the tension nut by turning in a counter clockwise direction, and turn until the rotor gently lifts from the motor shaft cone. You will just be able to feel the lift by hand. Continue to turn the tension nut until you can lift the rotor from the motor shaft.

Loading the Rotor

Check the rotor for firm seating (see Installing the Rotor). With swing-out rotors all rotor positions must be lined with identical buckets. Certain buckets are marked with the number of the rotor position. These buckets may only be used in the respective rotor position. Buckets that are marked with a set number (e.g. S001/4) may only be used in the set.

The rotors and hangers may only be loaded symmetrically. The centrifuge containers have to be distributed evenly on all rotor positions. For authorized combinations see “Rotors and accessories". In the case of angle rotors all possible rotor positions must be loaded (see Rotors and accessories).

On certain buckets, the weight of the maximum load or the weight of the maximum load and the maximum weight of the completely loaded hanger is specified. This weight may not be exceeded. In case of exception, see "Centrifugation of materials or mixtures of materials with a density higher than 1.2 kg/dm3". The weight specified for the maximum loading includes the total weight of adapter, frame, centrifuging container and content.

In containers with rubber inserts, the same number of rubber inserts must always be among the centrifuge containers. Always fill the centrifuge containers outside of the centrifuge. No liquid should be allowed to enter the centrifugal chamber during filling and swinging out of the hangers. The maximum filling quantity for the centrifuge containers specified by the manufacturer must not be exceeded. In order to maintain the weight differences within the centrifuge container as marginal as possible, a consistent fill level in the containers is to be heeded.




Greasing the Rotor Trunions

The rotor trunions are small steel knobs located at the end of a swing-out rotor. Accessories such as centrifuge buckets hang from these trunions during centrifugation. As the buckets swing on these trunions friction can build quickly due to the RCF. This friction may stop the buckets from swinging out to a full 90 degrees. As a result this can cause an imbalance or an undesired result in centrifugation.

To prevent having this problem simply grease the trunions regularly with Hettich Lubricating Grease (Cat. No. 4051). This will ensure consistent swing-out of the centrifuge buckets.

Cleaning the motor shaft

Centrifuge rotors are designed to sit evenly and to fit tightly onto the motor shaft. Daily use can cause particles of dirt to adhere to the motor shaft and cause an uneven seating of the rotor.

To prevent this from happening clean the motor shaft (C) and the rotor drilling (A), and lightly grease the motor shaft. Place the rotor vertically on the motor shaft. The motor shaft dog (D) has to fit in the rotor slot (B). The alignment of the groove is labeled on the rotor. Tighten the rotor tension nut with the supplied wrench by turning in a clockwise direction. Check the rotor for firm seating.

To loosen the rotor: Loosen the tension nut by turning in a counter clockwise direction, and turn until the rotor gently lifts from the motor shaft cone. You will just be able to feel the lift by hand. Continue to turn the tension nut until you can lift the rotor from the motor shaft.



Centrifuge Control knob

The control knob is a control panel feature that allows the user to intuitively and easily set the parameters on their centrifuge. Simply turn the knob counter-clockwise to reduce the value setting. Turn the knob clockwise to increase the value.

Statement about Leakage Current on Hettich Products
Hettich Centrifuges use brushless DC motors controlled by a device known as a Frequency Converter. This is a pulsing motor drive unit that keeps a tight tolerance on speed by varying the duration of the drive pulses as it monitors a speed sensing tachometer feedback signal.

This type of set-up is notorious for the amount of generated RF signal that shows up as AC leakage current in amounts that can top out over 1,000 uAmps (1 milliamp). Hettich has always claimed that their machines are built to EN 61010 standards, and are considered “Laboratory Equipment”, not medical devices. As such, Hettich has not tried to mitigate the amount of leakage current their devices generate. It is only recently that Hettich realized that deeper U.S. market penetration will require them to address the issue, especially to appeal to the hospital market and their very strict fire codes.

On some of their larger units Hettich now offers low AC leakage current models which contain built-in isolation transformers. Most Hettich models now are manufactured with a redundant chassis grounding post, a device the must be attached through a medical-grade connector to an earth ground that is separate from the centrifuge’s power source. A good example is a cold water pipe. With this properly installed, the centrifuge will pass a single-fault condition of the AC leakage current check with a close to 0 uAmp measurement.