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Hardware CP-4900 DMD µ-DMD fully integrated into CP-4900 Micro-GC hardware µ-DMD serial connected, via heated transfer line,(inert) with µ-TCD (modified)

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Presentation on theme: "Hardware CP-4900 DMD µ-DMD fully integrated into CP-4900 Micro-GC hardware µ-DMD serial connected, via heated transfer line,(inert) with µ-TCD (modified)"— Presentation transcript:

1 Hardware CP-4900 DMD µ-DMD fully integrated into CP-4900 Micro-GC hardware µ-DMD serial connected, via heated transfer line,(inert) with µ-TCD (modified) Micro-GC operates under standard conditions µ-DMD Micro-GC channel with µ-TCD

2 DMD Channel The radiation source used in the SVAC is 63 Ni. This material is in the form of a 63 Ni foil sheet that is placed within the manifold of the SVAC Sensor Cell Assembly. Radio active cell is regarded as a closed source

3 DMD Channel Flow controller Check valve Driftgas Zero Air or N2 Main board and UI board Sensor board Ni63 source

4 Hardware CP-4900 DMD Differences on standard CP-4900: main board revision/ IOC MPU firmware V1.30 build 01 Housing modification CP-4900 module TCD connections Heated transfer line DMD 4Watt NO UPGRADE POSSIBLE

5 Highlights of CP-4900 DMD CP-4900 DMD Analyzers Solutions Turnkey Solution for a specific application field Fully integrated into the CP-4900 Micro-GC Using µ-DMD (Micro Differential Mobility Detector) –High sensitivity < 100 ppb detection limit –Unique selectivity No interference with sample matrix Detect components even when they are co-eluting

6 Sensitivity of CP-4900 DMD 1. Iso-propyl mercaptan 2. Tert-butyl mercaptan 3. Sec-butyl mercaptan 4. N-propyl mercaptan 5. Iso-butyl mercaptan 6. N-butyl mercaptan 7. Tert-amyl mercaptan +/- 100ppb each! Hexane vapor as sample matrix. µ-TCD signal µ-DMD signal Sensitivity CP-4900 DMD < 100ppb

7 Selectivity of CP-4900 DMD Selectivity CP-4900 DMD No interference with sample matrix 1 2 C6-hydrocarbons µ-DMD signal µ-TCD signal Methyl- and Ethyl Acrylate in a natural gas 1. Methylacrylate, 1.8 ppm 2. Ehtylacrylate, 2.5 ppm

8 Principle of operation µ-DMD Micro-Differential Mobility Detector (µ-DMD) CP-4900 DMD, a joint developed by Varian, Inc. and Sionex Corporation, using Sionex's patented microDMX TM technology.

9 Principle of operation µ-DMD µ-DMD coupling µ-DMD serial connected, via heated transfer line,with µ-TCD

10 Principle of operation µ-DMD Ionization –Component from µ-TCD are ionized Tunable ion filter –Selective transmission of Components of interest, others are neutralized and hence not detected, they will pass through filter Detection –Both positive and negative species are detected

11 Principle of operation µ-DMD The micro-Differential Mobility Detector (µ-DMD) is a tunable ion filter Detector Selectivity is gained by: –Degree of ionization –Filter per component Mobility of the ion Vc or compensation voltage, RF- voltage –Detection Positive and negative ions Detector selectivity is additional to chromatographic selectivity

12 Principle of operation µ-DMD Ionization Source: Ni63 1. Ionization step

13 Principle of operation µ-DMD Ionisation Source: Ni63 2. Entry ion filter by using Zero air or Nitrogen as drift gas

14 Principle of operation µ-DMD 3. Various transmissions in the tunable ion filter Degree of ionization Mobility of the ion Voltage on electrode

15 Principle of operation µ-DMD 4. Detection of positive and negative ions

16 Principle of operation µ-DMD Both positive and negative ions are detected Differential Mobility Spectroscopy

17 Summary CP-4900 DMD Markets

18 Trouble shooting on DMD Driftgas flow incorrect Noise problems on DMD Noise problems on CP-4900 Sensitivity problems Communication problems Flow controller check valve check for leakage Flow controller DMD channel Interconnection board check driftgas pressure Check quality driftgas Adsorption of the component RS232 cable Interconnection board Expert Lite

19 DMD Channel transfer line Noise testing Cap the DMD off or remove the complete channel

20 DMD channel Each components 11 ppm 10m Porabound Q H2S:2015 COS:2683 CH3SH:2212 Each components 11 ppm DMD Channel: H2S: COS: CH3SH:366515

21 Loss of sensitivity What to check??? 1) Type and quality driftgas 2) Quality of the calibration mix 3) Tuning DMD

22 Heated transfer line

23 CP-4900 heated transfer line Take care when installing the heated transfer line over the TCD capillary

24 Expert Lite V2.0 Only adjust step size Adjust Vc default after tuning

25 Boot loader software Motorola S record(*.s) Upgrade for UI board IAR Generated Binar (*.a43) Upgrade for Sensor board

26 Boot loader software

27 Info on Sionex software Boot loader software 1) Upgrade software on User Interface board (UI board) 2) Upgrade software on Sensor board 1) Expert Lite info on UI and Sensor firmware


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