CEM iPrep Series - User Manual

Questions and Answers

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Stephanie LoweryAug 4, 2025
Why does the TempGuard message appear during a run on my CEM iPrep Laboratory Equipment?
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  Benjamin McdowellAug 4, 2025
  If a TempGuard message appears during a run with your CEM Laboratory Equipment, it could be due to some vessels being hotter than others. To address this: * Follow the Bake-out Procedure to minimize liner differences. * Avoid mixing old and new liners; run them in separate turntables. Alternatively, the TempGuard variables might be programmed incorrectly. Here’s how to correct that: * Set the TempGuard limit to 30 °C above the control temperature if the control temperature is below 250 °C. * Set the TempGuard limit to 20 °C above the control temperature if the control temperature exceeds 250 °C. * Limit TempGuard to 270 °C for digesting organics with HNO3. * Limit TempGuard to 300 °C for HPO/HSO applications.
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Michele WilliamsAug 11, 2025
What to do if the Max Power Monitor message appears during a run on my CEM iPrep Laboratory Equipment?
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  Tammy BellAug 11, 2025
  If a Max Power Monitor message appears during a run with your CEM Laboratory Equipment, there are a couple of potential causes. First, the Max Power Monitor variables might be programmed incorrectly. To fix this, verify that the Max Power Monitor is enabled and that the alarm time is set to 10 minutes (Settings > Run > Max Power Monitor). Another cause could be leaking vessels. Ensure that the vessels are assembled correctly and torqued using a torque tool.
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Henry GentryAug 18, 2025
Why are the bar graphs uneven during a run on my CEM iPrep?
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  Kevin MurphyAug 18, 2025
  Uneven bar graphs during a run with your CEM Laboratory Equipment can be caused by several factors: * **Acid Dilution:** Avoid diluting acids by more than 25% when operating above 220 ºC. * **Sample Similarity:** Ensure samples have similar properties and weights. Use the same sample type and amount in all vessels. * **Acid Usage:** Use the same acid and volume in each vessel within the turntable. * **Vessel Temperature:** Differences in vessel temperatures can cause uneven bar graphs. Follow the Bake-out Procedure to reduce liner differences. * **Acid Blanks:** Refer to "Sample Preparation Safeguards" for specific instructions when using acid blanks. * **Liner Leaks:** Pair liners with plugs that provide resistance and invert sleeves after each test to prevent leaks.
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ujohnsonNov 25, 2025
What does it mean if the vessel liner or sleeve appearance has changed in my CEM Laboratory Equipment?
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  Ryan FloresNov 25, 2025
  Changes in the appearance of the vessel liner or sleeve in your CEM Laboratory Equipment can indicate several issues. A dark ring at the bottom of the liner suggests it needs cleaning. See the “Vessel Cleaning” section for instructions. If the liner doesn't fit into the sleeve, determine if the liner or sleeve is the problem. Invert sleeves after each run to extend their lifespan. Alligator skin on the liner's exterior is due to high heat/pressure; group it with similar vessels. Stretching and a dark line on the liner indicates it should be discarded; see “Vessel assembly” for prevention. Discard distorted or flared sleeves; see “Vessel assembly” for prevention. A white sleeve indicates it should be replaced. To prevent damage, avoid prolonged high temperatures and wipe acid spills with a ...