Using The Hydrogen Sensor - Thermo Scientific FOCUS GC Site Preparation And Installation Manual

Using Hydrogen

Using the Hydrogen Sensor

The lower limit of the hydrogen sensor is 0.5% in volume. You should adjust the
detection threshold to 1% in volume, which is 25% of the hydrogen lower limit of
explosion (4% in volume).
In cases where the connections begin to leak or the column breaks, the sensor
alerts the operator. Then it automatically cuts off the gas supply and heating to the
active zones, and sweeps the column oven with forced air ventilation.
If the sensor detects anomalies or leaks during GC operation due to instrument
malfunction, the operator must immediately:
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•
•
The reliability of the sensor depends on careful maintenance. After the sensor is in
use, you must periodically check its operating performance and calibration as
recommended by the manufacturer. Refer to your hydrogen sensor's instruction
manual for maintenance guidelines.
WARNING! Never use hydrogen in your FOCUS GC system unless your GC oven has a
hydrogen sensor installed.
NOTE Thermo Fisher Scientific CSEs are not authorized to install or repair any instrument using
hydrogen as a carrier gas unless the instrument is equipped with the appropriate sensor.
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Site Preparation and Installation Manual
instrument safety requirements, a Thermo Fisher Scientific CSE or authorized
service technician should install the sensor.
If you plan to use a sensor other than the recommended Thermo Fisher
Scientific sensor, you must verify its ability to perform the functions listed
above before installing it. It must comply with your local safety regulations,
or with the IEC 61010
close the hydrogen supply
switch off the gas chromatograph
air out the room
IEC 1010-1, First Edition, September 1990; IEC 1010-1, Amendment 1, September 1992; IEC 1010-1,
Amendment 2, June 1995.
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regulations if local regulations do not exist.
Plumbing the Gas Supply to the GC
Chapter 4
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