Transcript No Slide Title

Hardware CP-4900 DMD
µ-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
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
Sensor board
Ni63 source
Flow controller
Check valve
Main board and
UI board
Driftgas
Zero Air or N2
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
Sensitivity CP-4900 DMD < 100ppb
µ-DMD signal
3
1
2
4
5
6
Hexane vapor as
sample matrix.
µ-TCD signal
7
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!
Selectivity of CP-4900 DMD
Selectivity CP-4900 DMD
No interference with sample matrix
2
1
µ-DMD signal
µ-TCD signal
C6-hydrocarbons
Methyl- and Ethyl Acrylate in
a natural gas
1. Methylacrylate, 1.8 ppm
2. 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
1. Ionization step
Ionization
Source: Ni63
Principle of operation µ-DMD
2. Entry ion filter by using Zero air or Nitrogen as drift gas
Ionisation
Source: Ni63
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
Differential Mobility Spectroscopy
Both positive and negative ions are detected
Summary CP-4900 DMD Markets
no
1
2
3
4
5
6
Analyzer
Sulfur odorants in
Natural Gas
Application
THT
TBM
MES
Sulfur-free odorants in Methyl Acrylate
Natural Gas
Ethyl Acrylate
Anesthetic gases in air Halotane
Enflurane
Isoflurane
Desflurane
Sevoflurane
Sulfur hydrocarbons in Hydrogen Sulfide
HC matrices
Carbonyl sulfide
Methyl Mercaptan
Mercaptanes C1-C4 in Methyl Mercaptan
gas
Ethyl Mercaptan
I-Propyl Mercaptan
n-Propyl Mercaptan
TBM, tert-Butyl Mercaptan
CFC’s & HCFC’s in air For example
CFC-11
CFC-12
CFC-113
CFC-114
CFC-115
Detection Limit DMD
0.5 mg/m3 (100 ppb)
Why
Safety
Environmental
Markets
Gas transportation
Gas Distribution
City gates
Fuel cells
Catalysts
<100 ppb
Safety
Operating Theaters
Anesthetic gas
companies
Recovery rooms
200 ppb
Safety
Environmental
Corrosion
Petro-chemical
processes
Catalysts
Fuel cells
De-sulfurisation
companies
Safety
Environmental
Personal monitoring
Environmental
companies
Emission control
companies
CFC & HCFC
Producers
0.35 mg/m3 (100 ppb)
0.45 mg/m3 (100 ppb)
<100 ppb
100 ppb
Trouble shooting on DMD
Driftgas flow incorrect
Flow controller
check valve
check for leakage
Noise problems on DMD
Flow controller
DMD channel
Interconnection board
Noise problems on CP-4900
check driftgas pressure
Sensitivity problems
Check quality driftgas
Adsorption of the component
Communication problems
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
Adjust Vc default
after tuning
Only adjust
step size
Boot loader software
IAR Generated Binar (*.a43)
Upgrade for Sensor board
Motorola S record(*.s)
Upgrade for UI 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