CEM MARSXpress 10 mL - User Manual

Questions and Answers

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Grant JohnstonAug 6, 2025
Why is there excessive venting from my CEM Medical Equipment?
- D
  Dylan FosterAug 6, 2025
  Excessive venting can occur due to several reasons. First, check that the correct “Sample Type” is selected in the method parameters; “Organic” is recommended for most samples—contact CEM before selecting other types. Second, ensure the vessel plug is correctly placed on top of the liner before securing it with the cap, referring to the “Vessel Assembly” instructions for details. Finally, verify that the vessels are properly torqued using the provided torque tool.
A
Amanda DonovanAug 13, 2025
What to do if I see uneven bar graphs during a run on my CEM Medical Equipment?
- M
  Margaret HillAug 13, 2025
  Uneven bar graphs during a run can be caused by several factors: * Lack of similarity in sample type or weight: Ensure samples have similar properties or use the same sample in all vessels, with similar amounts. * Different acids or volumes: Use the same acid(s) and acid volume in each vessel. * Temperature variations: Refer to the “Liner Bake-out Procedure” to reduce temperature differences in liners. * Acid blanks: Consult "Sample Preparation Safeguards" for details when running acid blanks.
B
Bobby DonaldsonAug 20, 2025
What to do if a TempGuard message appears during a run on my CEM Medical Equipment?
- S
  shermanjessicaAug 20, 2025
  A TempGuard message during a run indicates that some vessels are hotter than others. To address this: * See “Liner Bake-out Procedure” to reduce temperature differences in liners. * Avoid mixing old and new liners; run them in separate turntables.
S
samuelwardAug 28, 2025
How to fix the sleeve appearance change on my CEM Medical Equipment?
- H
  Haley PerezAug 28, 2025
  If the sleeve has turned white (no longer golden brown) and/or stained on the ends, replace it. To prevent sleeve damage, avoid high temperatures for extended periods. If the sleeve comes in contact with acid, wipe it with a damp cloth and allow it to dry.

CEM MARSXpress 10 mL Specifications

General

Brand	CEM
Model	MARSXpress 10 mL
Category	Medical Equipment
Language	English

Summary

Safety

Safety Notations

Explains the three safety alert words (NOTE, CAUTION, WARNING) used in the manual.

Introduction

About the MARSXpress Vessels

Describes the MARSXpress vessel's design, applications, and compatibility with MARS 6.

Important Safeguards

Operating Parameters

Details acid volume, temperature, hold time, and sample weight limits for MARSXpress vessels.

Microwave Safeguards

Lists safety precautions for operating the MARS 6 microwave, including minimum volume and handling stopped runs.

Sample Preparation Safeguards

Guidelines for preparing samples, mixing samples, and using acid blanks.

Vessel Safeguards

Rules for using CEM consumables, conditioning liners, assembling vessels, and handling heavy turntables.

Compounds Unsuitable for Closed Vessel Microwave Digestion

Lists chemical compounds and sample types that should not be used due to explosion or reactivity hazards.

Vessel and Accessories Overview

MARSXpress Vessel Sizes and Materials

Describes the four available sizes (10, 20, 55, 75 mL) and liner materials (PFA, TFM).

Vessel Components

Identifies and illustrates the parts of a MARSXpress vessel: liner, plug, cap, and sleeve.

Accessories

Shows and names common accessories: Turntable, Torque Tool, and Vessel Rack.

New Liner and Plug Conditioning

Nitric Acid Liner and Plug Conditioning

Step-by-step guide for conditioning new liners and plugs for nitric acid use.

Non-Nitric Acid Liner and Plug Conditioning

Step-by-step guide for conditioning new liners and plugs for non-nitric acid applications.

Perform a Digestion

Vessel Assembly

Instructions for assembling the MARSXpress vessels, including sample and acid addition.

Torquing the Cap

Details the procedure for tightening the vessel cap using a torque tool for proper sealing.

Turntable Setup

Steps for correctly loading and positioning vessels in the turntable for optimal performance.

Load and Perform a Method

Guide on selecting, loading, and running a digestion method on the MARS 6 instrument.

Vessel Removal

Step-by-step instructions for safely removing cooled vessels from the instrument and turntable.

Cleaning and Inspection

Liners, Vent Plugs, and Caps Cleaning

Procedures for cleaning vessel components, including specific steps for ppm/ppb/ppt analyte levels.

Liner Bake-out Procedure

Method to remove residual acid vapors and gases from Teflon liners using an oven.

Sleeves Cleaning and Inspection

Guidelines for cleaning, inspecting, drying, and handling vessel sleeves.

Turntable Cleaning

Instructions for maintaining the turntable, including cleaning ball bearings and handling acid spills.

Vessel Distribution

Methods

Create a One Touch Method

Steps to program a new One Touch digestion method on the MARS 6 instrument.

Create a Classic Method

Mentions contacting CEM for creating Classic Methods.

Routine Maintenance

After Every Use Maintenance

Tasks to perform after each digestion cycle, including cleaning and inspection.

As Needed Maintenance

Describes the 'Liner Bake-out Procedure' for removing residual gases as needed.

Annual Maintenance

Recommendation to contact CEM Service for annual maintenance contracts and information.

Troubleshooting

Problems and Possible Solutions

Lists common issues like excessive venting or uneven graphs and their potential causes and solutions.

Technical Assistance

Applications Support

Information on accessing application notes, method notes, and contacting CEM for application-specific queries.

Technical Support

Details on how to contact CEM for technical support and information needed for service.