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“WELCOME”
Da Vinci Laboratory Solutions “New DVLS³ Simply, Smart, Sensor
focus on Hydrogen”
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A Hydrogen Sensor can ensure Safety when using Hydrogen as a Carrier Gas
in a Chromatographic Systems
Da Vinci Laboratory Solutions
January 22, 2013
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Talking Points
Four reasons for using H2 as a carrier gas
Safety measures
Hydrogen sensor
Principle of operation and measurement
Hardware overview
Calibration and maintenance
Benefits
Questions
1. Fast Analysis:
Viscosity of H2
Low oven temp programming
2. High Efficiency:
H2 Flattest Van Deemter curve
Reasons for using H2 as a Carrier Gas
3. Prolonged Column Life:
□ Due to lower oven temp
4. Cost effective:
□ 3x’s less expensive than its helium equivalent
□ Bottle or generator
Reasons for using H2 as a Carrier Gas
Reluctant to use H2 as a Carrier Gas?
Hydrogen is an Explosive Gas: Undetected gas leaks can lead to an explosion in the GC oven
LEL of hydrogen in Air is at 4%
Safety measures
Monitor hydrogen usage
Safety measures in GC hardware □ Safety Shutdown:
□ Flow Limiting Frit EPC
□ Explosion Test: GC designed to contain parts in case of explosion
6890exp.avi.MPG
Hydrogen sensor in the oven or valve box
Budget for new GC
Principle of Operation Hydrogen Sensor
Pellister, catalytic reaction
Surface of the pellet and noble metal will react
Exothermal oxidation of flammable gases
2 H2 + O2 → 2 H2O(g) + heat
Temperature rise
Principle of Measurement Hydrogen Sensor
Compensator pellet is identical but without
catalyst
Measurement circuit: a Wheatstone Bridge
9 28 March 2013
Gas sensitivity Hydrogen Sensor
1% H2 = 80 mV
Accuracy of the Hydrogen Sensor
Room temperature bandwith
Typical long term zero offset drift Hydrogen Sensor
Hardware overview for a Hydrogen Sensor for GC applications
Sensor installed in the GC Oven
Transfertube through the oven wall to ensure a stable temperature
Automatic Switch to Nitrogen
After 1% H2 detection, the carrier gas supply is switched to nitrogen. The system will maintain a flow through the column.
After 1% H2 detection, the sequence will stop after the analysis. No waste of analyses or sample.
Automatic Stop Signal to GC
After 1% H2 detection a choice of alarm signals:
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Alarm messages
Acoustic alarm
Optical alarm (blinking display)
SMS alarm message
4 Sensors, one controller
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H2
Pressure Temp
Leak detection
(Optional) Text message alarm if out of range
Switch to N2 as carrier gas
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Calibration & Maintenance
Zero Point Calibrated Using Air
Alarm level Calibrated using Calibration Mixture
Yearly or after maintenance or repair
A Silicon hose can’t be used
Benefits
Able to use 4 different or 4 same sensors on one
unit
Battery operated in case of leak detection
Power failure, battery back-up (few hours)
Multiple alarms
Can link LIMS system to log alarms
In future be able to talk by Wifi
High sensitivity and long life time
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Questions?
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Contact Details
[email protected] www.davinci-ls.com P: +31 (0)10 258 1870 F: +31 (0)10 258 1879
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THANK YOU!
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