Installation
Connecting supply gases
32
C
For TCD reference gas, set supply pressure to the
appropriate REF on/off valve to 276 kPa (40 psi).
C
For an FID or NPD , set H
1
and air supply pressures to the
appropriate HYDROGEN and AIR on/off valves (detector flow
manifold block) to 103 kPa (15 psi) and 276 kPa (40 psi),
respectively.
Note that optimum FID operation requires setting H
1
and air flow
rates (determined by supply pressures) based specifically upon carrier
gas flow rate (+ capillary makeup gas flow rate for capillary
applications). The pressures given here are adequate for leak•testing,
but are not necessarily correct for all FID applications.
3. Beginning where each regulator connects to the cylinder, and ending
at installed fittings in the HP 5890, check each connection for leakage
using a suitable leak•detectionfluid.
4. Tighten and recheck any leaking fittings.
5. When all installed fittings are verified to be leak•free,replace the side
panel, making sure all gas•supplytubing is routed through the exit
slot at the rear of the instrument, and continue with installation.
Connecting cryogenic coolant
The connection to the cryogenic inlet valve (if installed) is made through
an access slot in the lower edge of the left side panel. A drain for
condensation fluid is located below the slot.
Remove the left side panel by removing two screws along the bottom
edge; then slide the panel toward the rear of the instrument and lift.
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