Milestone MAXI-44 Bedienungsanleitung

MAXI-44

User Manual

MA179

MILESTONE

HELPING

CHEMISTS

Milestone Srl MA179-004 –MAXI-44 –User Manual

GETTING STARTED GUIDE

Thank you for selecting our microwave system.

We are sure that you will be completely satisfied with the performance of

this new unit entering your laboratory. We invite you to read carefully this

user manual and to keep it in reach for convenient and fast consulting.

The person who will be using this unit should have received an

appropriate training from a Milestone trained technician. For any possible

clarification or any request for assistance please contact either our

Representative in your country:

or Milestone at the following address:

Milestone Srl

Via Fatebenefratelli, 1/5

24010 Sorisole (BG) Italy

Tel +39 035 573857

Fax +39 035 575498

Website www.milestonesrl.com

E-mail analytical@milestonesrl.com

Pubblication date (gg/mm/aaaa) 15/10/2021

Milestone Srl MA179-004 –MAXI-44 –User Manual 
GETTING STARTED GUIDE 
2 
 
1SAFETY INSTRUCTIONS......................................4
1.1 General Information.............................................................4
1.2 Safety in operations.............................................................4
1.3 Any unit manipulation allowed .............................................4
1.4 Maintenance and parts replacement....................................5
1.5 Customer support................................................................5
1.6 Other hints...........................................................................5
Working with accessories..............................................................................5 
2SYSTEM DESCRIPTION........................................6
2.1 Overview .............................................................................6
2.2 Configurations .....................................................................6
There are four different types of MAXI rotor depending on the maximum 
number and capacity of vessels:...................................................................6 
2.3 Technical Specifications......................................................6
2.4 Temperature control ............................................................6
3VESSEL SYSTEM ..................................................7
3.1 Operations with MILESTONE high throughput rotors...........7
Weighing.......................................................................................................7 
Chemicals addition........................................................................................8 
3.2Vessel construction MAXI 44...............................................8
4OPERATIONS ........................................................9
4.1 Protection shield introduction...............................................9
4.2 Vessel closure and installation...........................................10
4.3 Rotor installation................................................................11
4.4 Rotor removal....................................................................12
4.5 Vessel removal..................................................................12
4.6 Vessel opening..................................................................13
5CARE AND MAINTENANCE INSTRUCTIONS....14

Milestone Srl MA179-004 –MAXI-44 –User Manual 
GETTING STARTED GUIDE 

1 General cleaning ...............................................................14
2 Care and maintenance of IR sensor ..................................14
3 IR-Sensor test instructions.................................................14
6CLEANING INSTRUCTIONS................................16
1 General..............................................................................16
2 Leaky cover.......................................................................16
3 Test of microwave absorption............................................16
4 Cleaning of the cover.........................................................16
5 Cleaning of protection shield..............................................17
6 Cleaning of PTFE vessel...................................................17
7APPENDIX............................................................18
1 Regular test (Accessories/vessels/rotors)..........................18
8MAXI-44 ROTOR TIPS AND TECHNIQUES........19
1 General working specifications..........................................19
2 MAXI-44 Vessels...............................................................19
3 Operating tips....................................................................20
4 Maintenance and Care ......................................................24
 

Milestone Srl MA179-004 –MAXI-44 –User Manual

GETTING STARTED GUIDE

1safety instructions

1.1 General Information

▪Please read carefully this operator manual before starting the system and follow its

prescriptions with the utmost care.

▪In case the system was delivered with additional accessories, also read carefully the

instruction manuals of such accessories.

▪Follow particularly the recommended instructions for Service and Maintenance.

▪This Operator Manual is part of the delivery, hence shall be always kept together with the

instrument on its working place.

▪It is imperative that every person operating this system has read and fully understood this

manual.

▪The non-observance of the instructions contained herein or improper use may involve

damages/injuries not covered by product liability!

▪The national ruling and international safety norms in working environment shall in any case

be observed under user’s responsibility.

▪It is also user’s responsibility to keep constantly updated all safety norms ruling in the

country or operation.

Information= indicates important information/recommendation for the user.

Attention = means that the warning non-observance may cause damages to unit

or properties.

Warning = means that the warning non-observance may cause injuries, even

severe, to people.

1.2 Safety in operations

▪The unit shall be operated only according to its intended purpose.

▪The unit shall only be operated within the power limits set by technical specifications.

▪The unit shall be operated exclusively by specially trained people.

▪All electrical parts shall always be protected from wet and humidity.

▪The unit shall be kept clean.

▪Basic rules of chemistry will always apply. The basic rules of chemistry are valid also for

chemicals handling. Working with chemicals, always take into account all safety measures

usually required (e.g. lab coat, protective gloves, protective glasses mask, exhausts hood,

etc.)

1.3 Any unit manipulation allowed

▪Constructive changes/modifications of the unit and its accessories are forbidden.

Milestone Srl MA179-004 –MAXI-44 –User Manual

GETTING STARTED GUIDE

1.4 Maintenance and parts replacement

▪In order to guarantee the good functioning of the unit and user’s safety, all replacement

parts shall be exclusively original supplied by the manufacturer. The original parts are

produced with particular attention to quality and manufactory production.

1.5 Customer support

▪The warranty certificate and qc report are included in the documents supplied with the

unit.

▪In case of unit reparation, please send us a service report with complete problem or

damage description.

▪For any question or spare parts order, please contact our representative in your country or

directly Milestone.

1.6 Other hints

▪Please take into account all the safety measures when filling in the vessels before the run

or when opening the vessel, once completed the run.

Don’t label the vessels. Discoloration may occur on protection shield with the

consequent damage.

Working with accessories

▪The complete vessel system must be treated with the utmost care and regularly tested. In

case of damage, the corresponding components must be replaced. Please pay particular

attention to the chapter “Care and maintenance instructions”.

Milestone Srl MA179-004 –MAXI-44 –User Manual

GETTING STARTED GUIDE

▪

2SYSTEM DESCRIPTION

2.1 Overview

The MAXI rotor (medium pressure rotor) contains up to 44 vessels for acid digestion of easy

to medium-difficult samples, such as soils, sludge, sediments, wastewater, food and feed,

pharmaceutical.

The MAXI-44 rotor in totally controlled by contact- less infrared sensor (T2) for

temperature control of each single vessel.

A high quality PTFE vessel serves as well as chemicals and heat resistant. In order to prevent

any deformation, the reaction vessel is protected by a PEEK protection cover. This high-quality

material keeps the inner vessel fit and ensures a longer lifecycle of vessel systems.

2.2 Configurations

There are four different types of MAXI rotor depending on the maximum number and capacity

of vessels:

Rotor

Positions

Volume

(Vessel capacity)

MAXI-44 (80 ML)

80 ml

MAXI-44 (100 ML)

100 ml

2.3 Technical Specifications

Rotor

Min volume*

Max volume

Recommanded

Working

Temperature

Max working

pressure

Recommanded

Max Holding

Time

MAXI-44

(80ML)

8 ml

50 ml

200°C

35 bar

30 minutes

MAXI-44

(100ML)

8 ml

50 ml

200°C

35 bar

30 minutes

* Since MAXI is totally controlled by external sensor (IR-TC), the minimum volume could be

less than 8 ml. It depends on several factors such as sample type, sample amount, acid mix.

Contact the Milestone application specialist for more informations.

When exceeding the specified limit values, you must consider that the parts are

subjected to increased stress or damage. If are used the maximum routine

conditions, a regular test of vessel systems has to be carried out. All maximum

values are reachable only with the suitable materials.

2.4 Temperature control

As mentioned above, MAXI-44 rotor is totally controlled by

contact-less infrared sensor (T2), which is positioned on the

right-hand side of the cavity. IR sensor is able to determine

the temperature of each single vessel oft he rotor by reading

the temperature of the external surface oft he safety shields.

Please, refer to Ethos UP/Ethos EASY User manual for detailed

info on the sensors.

Milestone Srl MA179-004 –MAXI-44 –User Manual

GETTING STARTED GUIDE

3VESSEL SYSTEM

3.1 Operations with MILESTONE high throughput rotors

When working with MILESTONE rotors, observe all safety indications and specifications. The

user must be familiar with the operations with vessel systems. In addition follow the operating

instructions reported in the microwave system user manual.

Weighing

In order to avoid erroneous changes among the vessels, the internal vessel should be

immediately closed and placed in the corresponding position of the numbered rotor.

Never label the vessels. The label color contaminates the protection shield and

diffuses into the vessel.

1. Place the cleaned vessel on the balance

2. Set the balance to zero (tare) and weigh the

sample.

3. Take note of the total weight or consider the

weight data on the terminal.

The weighing with the weighing paper and weighing boat is possible as option and

reduces e.g. the weighing errors due to electrostatic charge.

Milestone Srl MA179-004 –MAXI-44 –User Manual

GETTING STARTED GUIDE

Chemicals addition

Add the necessary chemicals by the dosing station

giving attention to wet every possible part of sample

left on the inner walls of the vessel.

E.g. by carbonates replacement, sample/chemicals foaming or spray can occur. Take

into account the necessary precautions and wear the suitable protection equipment,

such as protection glasses, gloves, working under fume hood etc.

When dealing with digestions, it normally makes sense to let the samples react 5 up to 10

minutes before closing the vessels. Before vessels closure, the sample must be well mixed with

the acid, otherwise it could result in severe partial reactions. For this purpose there are several

options: magnetic stirring, stirring bar etc. When handling samples with consequent gas

development, a cover is placed on the vessel, in order to avoid spray losses.

3.2 Vessel construction MAXI 44

Vessel 80 ml / 100ml

Cover

Vessel cover with thread

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