SRI HID DETECTOR
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Universal detector
(except for neon) |
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Detects levels from
1-2% down to 10ppm |
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Requires only helium
carrier and make-up gas |
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Perfect compliment to
the TCD |
The Helium
Ionization Detector ( HID ) is a "universal"
detector which responds to all molecules. The
HID requires helium carrier and make-up gas, and
delivers sensitivity in the low ppm range.
Unlike an FID however, the HID needs no hydrogen
or air. It is especially useful in combination
with a TCD detector because the TCD is not
sensitive enough to detect low ppm
concentrations, while the HID saturates in the
low percent range, so together it is possible to
cover 1ppm to 100%.
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The HID is
particularly useful for volatile inorganics like
NOX, CO, CO2, O2, N2, and H2 which do not
respond on FID or other detectors. Many labs are
reluctant to store hydrogen fuel gas for safety
reasons, so the fact that the HID needs only
helium is a significant advantage.
Unlike other
HID designs, the SRI HID can be easily
disassembled for cleaning. The HID incorporates
a low cost, easily replaceable electrode which
supports a low current arc through the helium
make-up gas flow. This elevates the surrounding
helium to a meta-stable state. When the
meta-stable helium molecules collide with the
sample molecules as they elute from the column,
the sample molecules are ionized and attracted
to a collector electrode, amplified and output
to the data system.
Click here
for printable HID technical overview (.pdf).
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#SRI-8690-0030,
HID DETECTOR |
$3,599.00 |
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