CEM iPrep 12 Manual Download Page 8

4

Important Safeguards

Vessel Safeguards

• Only use vessels and vessel components purchased directly from CEM or through its authorized dealer 

network.

• All vessel components must be dry prior to use
• Always condition new liners and plugs
• Do not batch old liners with new liners unless new liners have been conditioned with at least 3 runs using 

the customer’s sample

• Ensure vessels are assembled properly

• Align tab on load disc in center notch of liner
• Look for vent hole through the frame
• Align liner properly on insulator disc at bottom – liner flush with tab
• Use torque block

• Invert sleeves after every run to extend lifetime and promote better sealing & even heating

• Slide liner into the end of the sleeve with most resistance felt if unsure which side was previously 

used

• CEM recommends using a high temperature pen to mark sleeves for a visual reference.

• Try to group liners with similar sample history and usage

• Segregate liners for HNO

3

 and non-HNO

3

 applications

• Do not use a new liner with a set of liners that has been run consistently until the new liner has 

been conditioned with that sample type

• Pull ones that run 20 ºC hotter than average and run them together

• Bake out liners and plugs to remove residual HNO

3

 & NOx gases

• Use Bake Out procedure for iPrep vessels (210 °C for 6 hrs – overnight)
• Bake out liners if TempGuard

TM 

is triggered

Microwave Safeguards

• Always use the TempGuard feature in the method

• Set the TempGuard limit at 30 °C > control temperature if control temperature is < 250 °C.
• Set the TempGuard limit at 20 °C > control temperature if control temperature is > 250 °C
• Limit TempGuard to 270 °C for digestion of organics with HNO

(primarily)

• Limit TempGuard to 300 °C for H

3

PO

4

/H

2

SO

4

 (primarily) applications

• Limit control temperature of organics with HNO

3

 to 250 °C

• Choose Sample Type in method with software version 1.45 or higher as follows:

• Standard = Any acid mixture other than HCl or HF dominant
• HCl = aqua regia or acid mixtures that are ≥ 75% HCl

• Always use the Max Power Monitor and set the alarm time for 10 minutes
• Maximum programmable temperature is 300 °C 

• Maximum temperature varies per acid. See "Operating Parameters" for temperatures

• Maximum programmable Hold Time is 45 minutes
• If a run is stopped or paused for more than 30 seconds during the digestion, do not restart the method 

with hot vessels

• Allow vessels to cool < 80 °C
• Vent vessels and reseal
• Restart method from the beginning

• Allow vessels to cool below 80 ºC before opening the microwave door.

Summary of Contents for iPrep 12

Page 1: ...iPrep High Performance Vessels Manual...

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Page 3: ...and Plug Conditioning 8 Non Nitric Acid Liner and Plug Conditioning 9 Perform a Digestion Vessel Assembly 10 Turntable Setup 13 Load and perform a Method 14 Vessel Removal 14 Vessel Cleaning and Insp...

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Page 5: ...servation or action as described below NOTE A NOTE is intended to provide emphasis of procedures that may be misinterpreted or overlooked or to otherwise clarify confusing situations CAUTION A CAUTION...

Page 6: ...geological samples This vessel is also a great option when digesting 1 g or larger samples due to ppt detection limit needs Preinstalled methods take the guesswork out of method creation and sample pr...

Page 7: ...250 C 250 C Hydrochloric Acid 250 C 250 C Hydrofluoric Acid 250 C 250 C Sulfuric Acid 300 C 300 C Phosphoric Acid 300 C 300 C Aqua Regia 250 C 230 C Water 180 C 180 C Maximum Sample Weight Food Plant...

Page 8: ...ter than average and run them together Bake out liners and plugs to remove residual HNO3 NOx gases Use Bake Out procedure for iPrep vessels 210 C for 6 hrs overnight Bake out liners if TempGuardTM is...

Page 9: ...may become nitrated and potentially explosive Absence of a particular chemical compound from this list does not imply microwave acid decomposition of such a sample is safe under all conditions Explosi...

Page 10: ...r than original CEM parts will put operators and equipment at risk therefore CEM will not assume any liability for use of these parts and all warranties either written or implied will immediately beco...

Page 11: ...seal Includes plug removal tool 2 Vessel Liner Holder Holds up to a set of 16 vessel liners 3 12 Place Turntable Holds assembled vessels inside MARS 6 cavity and provides rotation 4 16 Place Turntable...

Page 12: ...safety data sheet Refer to these guidelines for proper handling and disposal of the reagents 3 Add 10 mL of HNO3 to each liner Use the acid to rinse the inside of the liner to ensure that the sample...

Page 13: ...nse the inside of the liner to ensure that the sample is in the base of the liner 4 Wait 15 minutes to allow pre digestion 5 Assemble and torque each vessel See Vessel Assembly for detailed instructio...

Page 14: ...weights 2 2 Add the acid 5 mL 30 mL working volume Use the acid to rinse the inside of the liner to ensure that the sample is in the base of the liner If running more than one vessel you must run sim...

Page 15: ...nto the sleeve NOTE Invert the vessel sleeves after every test to help maintain uniformity of the liner and sleeves 6 Place the load disc on the plug with the tab on the disc facing downward so that i...

Page 16: ...12 Perform a Digestion 8 Tighten the screw onto the top of the load disc until it is finger tight 9 Use the provided torque block and tighten the screw until a single click is heard or felt...

Page 17: ...at the mat is not covering the iWave sensors 2 Load the empty turntable into the instrument by aligning position 1 with the front of the instrument 3 Turntable must be seated down on drive lug NOTE CE...

Page 18: ...and reseal and restart method from the beginning CAUTION Observe the entire digestion sequence when establishing a procedure for the first time 5 Verify that vessel count type and position are correc...

Page 19: ...ent hole pointed away from the user 4 Use the torque block to carefully loosen the vessel screws allowing them to vent 5 Remove the vessels from the frame carrier rack 6 Place the liner and plug into...

Page 20: ...form a Digestion 8 Transfer the digested sample from liner and proceed with work up CAUTION Never pour sample or liquid from liner with sleeve in place 9 Clean vessels as outlined in Vessel Cleaning S...

Page 21: ...P Avoid abrasive cleansers and stiff brushes which can scratch the Teflon surface 5 Clean liners and plugs using the microwave as outlined below All vessel components must be dry before use 5 1 Add 10...

Page 22: ...e in color comparable to new liners with no acid history Turntable Frame Load Disc Screw Racks 1 Wash in hot soapy water as needed and allow to dry completely before use 2 Inspect the turntable frames...

Page 23: ...istribution is required for optimal performance Proper spacing will eliminate hot spots issues regarding turntable balance and provide optimal temperature sensing 2 vessels 3 vessels 4 vessels 5 vesse...

Page 24: ...mal performance Proper spacing will eliminate hot spots issues regarding turntable balance and provide optimal temperature sensing 2 vessels 3 vessels 4 vessels 14 vessels 15 vessels 16 vessels 5 vess...

Page 25: ...e version 1 45 or higher as follows Standard Any acid mixture other than HCl or HF dominant HCl Aqua Regia or acid mixtures that are greater than or equal to 75 HCl 6 Select Hold Time and enter in the...

Page 26: ...ve lightened in color or turned white or are flared at the ends Annually Contact CEM Service Department local CEM subsidiary or distributor for information on CEM Service contracts Bake out Procedure...

Page 27: ...See Sample Preparation Safeguards for specific details when running acid blanks Liner not getting as hot due to leaking Pair liners with plugs that offer resistance Invert sleeves after every test to...

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