hardware cp-4900 dmd µ-dmd fully integrated into cp-4900 micro-gc hardware µ-dmd serial connected,...
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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)
• Micro-GC operates under standard conditions
µ-DMD
Micro-GC channel with µ-TCD
DMD Channel
The radiation source used in the SVAC is
63Ni. This material is in the form of a 63Ni foil
sheet that is placed within the manifold of the SVAC Sensor Cell
Assembly.
Radio active cell is regarded as a closed source
DMD Channel
Flow controller
Check valve
Driftgas
Zero Air or N2
Main board and
UI board
Sensor board
Ni63 source
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
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
Sensitivity of CP-4900 DMD
1. Iso-propyl mercaptan2. Tert-butyl mercaptan3. Sec-butyl mercaptan4. N-propyl mercaptan5. Iso-butyl mercaptan6. N-butyl mercaptan7. Tert-amyl mercaptan
+/- 100ppb each!
1
2
3
45 6 7
Hexane vapor as sample matrix.
µ-TCD signal
µ-DMD signal
Sensitivity CP-4900 DMD < 100ppb
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 ppm2. Ehtylacrylate, 2.5 ppm
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 microDMXTM technology.
Principle of operation µ-DMD
µ-DMD coupling
µ-DMD serial connected, via heated transfer line,with µ-TCD
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
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
Principle of operation µ-DMD
Ionization Source: Ni63
1. Ionization step
Principle of operation µ-DMD
Ionisation Source: Ni63
2. Entry ion filter by using Zero air or Nitrogen as drift gas
Principle of operation µ-DMD
3. Various transmissions in the tunable ion filter Degree of ionization Mobility of the ion Voltage on electrode
Principle of operation µ-DMD
4. Detection of positive and negative ions
Principle of operation µ-DMD
Both positive and negative ions are detected
Differential Mobility Spectroscopy
Summary CP-4900 DMD Markets
no Analyzer Application Detection Limit DMD Why Markets1 Sulfur odorants in
Natural GasTHTTBMMES
0.5 mg/m3 (100 ppb)
2 Sulfur-free odorants inNatural Gas
Methyl Acrylate
Ethyl Acrylate
0.35 mg/m3 (100 ppb)0.45 mg/m3 (100 ppb)
SafetyEnvironmental
Gas transportationGas DistributionCity gatesFuel cellsCatalysts
3 Anesthetic gases in air HalotaneEnfluraneIsofluraneDesfluraneSevoflurane
<100 ppb Safety Operating TheatersAnesthetic gascompaniesRecovery rooms
4 Sulfur hydrocarbons inHC matrices
Hydrogen SulfideCarbonyl sulfideMethyl Mercaptan
200 ppb
5 Mercaptanes C1-C4 ingas
Methyl MercaptanEthyl MercaptanI-Propyl Mercaptann-Propyl MercaptanTBM, tert-Butyl Mercaptan
<100 ppb
SafetyEnvironmentalCorrosion
Petro-chemicalprocessesCatalystsFuel cellsDe-sulfurisationcompanies
6 CFC’s & HCFC’s in air For exampleCFC-11CFC-12CFC-113CFC-114CFC-115
100 ppb SafetyEnvironmental
Personal monitoringEnvironmentalcompaniesEmission controlcompaniesCFC & HCFCProducers
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
DMD Channel transfer line
Noise testing
Cap the DMD off or remove the complete
channel
DMD channel
Each components 11 ppm
10m Porabound Q
H2S:2015
COS:2683
CH3SH:2212
Each components 11 ppm
DMD Channel:
H2S:222486
COS:206760
CH3SH:366515
Loss of sensitivity
What to check???
1) Type and quality driftgas
2) Quality of the calibration mix
3) Tuning DMD
Heated transfer line
CP-4900 heated transfer line
Take care when installing the heated transfer line over the
TCD capillary
Expert Lite V2.0
Only adjust
step size
Adjust Vc default
after tuning
Boot loader software
Motorola S record(*.s)
Upgrade for UI board
IAR Generated Binar (*.a43)
Upgrade for Sensor board
Boot loader software
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