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Hydrogen Sensor
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.
Approved
Introduction
The use of hydrogen as carrier gas in capillary column gas chromatographs
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 the oven
of the GC with the H2-Sensor, eliminates this danger completely.
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 indicator band. Exceeding gas concentrations of the set threshold will realize the acoustic signal and optical alarm. The acoustic signal could be switched off at the rear of the electronic panel with the sound switch.
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.
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.
The Hydrogen Sensor can be installed on the every Gas Chromatograph installed in your Lab.