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Hydrogen
Sensor |
 |
 Approved |
Self
contained solid state unit for the continuous monitoring of air in a gas chromatographic
oven. Sensitive to hydrogen if leaking occurs in the carrier gas system.
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|
Hydrogen
Sensor |
|
|
Approved |
Self
contained solid state unit for the continuous monitoring of air in a gas chromatographic
oven. Sensitive to hydrogen if leaking occurs in the carrier gas system.
|
| Introduction |
The use of hydrogen as
carrier gas in capillary column gaschromatographs has a lot af advantages. The only
aversion against the use of hydrogen as carrier gas is the possibility of an explosion in
the oven compartment in case of a leakage. The permanent monitoring of the air in
thé oven
of the GC with the H2-Sensor, eliminates this danger completely.
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| Principle of operation |
Continuous circulated
air in the GC oven flows through the thermostabilized sensor head, causing a signal change
by hydrogen detection. In this way measured gas concentration will be shown on the front
panel numeric and on the indicatorband. Exceeding gas concentrations of the set threshold
will realise the acoustic signal and optical alarm. The acoustic signal could be switched
off at the rear of the electronic panel with the sound switch.
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| Description of the system |
The H2 -Sensor
consists of a gas detector head and electronic control unit. The gas sensor head is
mounted at the rear of the GC an the 1/4" pipe leading in the oven compartment and
connected to the monitor unit (Sub D, 9 pol). The electronics is protected by the 2 piece thermoplastic housing. The front panel view shows operational conditions. In case of hydrogen alarm, relay output GA 1 will switch the safety valve unit (P/N 9 1000801) to a inert gas (N2) to prevent damages. (e.g. explosion; save column). Factory pre-set at 1 % by vol. H2 in air . The relay output GA 2 at the same time will send the GC into forced cooling, switching off the oven heating power. All relays are set in alarm position if power fails or being switched off.
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| Control Unit |
The front panel will show the hydrogen concentration an the LED digit display in % of full scale and at the same time on the LED indicator bar. If the H2 concentration is above set threshold level, the alarm will be released; LED display and indicator bar light intermittent; ALARM-Reset light up and audible alarm sounds. When concentration level falls 20 % under the set limit of 1 % H2 by vol. The alarm/reset lights intermittent; LED display and indicator bar light will be normally again.
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The Hydrogen Sensor can be installed on the every Gas chromatograph installed in your Lab. |
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