Thermo Scientific 42i Instruction Manual page 246

Optional Equipment
Internal Permeation Span Source
Computation of
Concentrations
Oven Installation and
Configuration
9-4 Model 42i Instruction Manual
6. Replace the glass chamber assembly into the oven until the top of the
assembly is flush or slightly below the top of the oven.
Equipment Damage Do not use tools to tighten the knurled screw in the
following step. ▲
7. Tighten the knurled screw finger tight. Do not use tools to tighten.
8. Tighten the white plastic retaining collar.
9. Replace the oven cover being careful to place the tubing and wiring
into the cover slot.
The computation of NO
information. Note that is assumed that all devices are properly calibrated
and that all flows are corrected to 25 °C and 1 atm.
Permeation Tube:
Output
Where:
R = permeation rate in ng/min
Q = flow rate of gas (scc/min) during span mode
0
K = constant for the specific permeant = 24.45 / MW
MW = molecular weight
K(NO ) = 0.532
2
Use the following procedure to install and configure the permeation oven.
1. Physically install the permeation oven and valves into the instrument
and connect the cables and plumbing.
2. From the Perm Oven Settings menu in the Service menu, select Perm
Oven Selection, then select 45 °C.
output level is shown in the following
2
(R) (K)
(ppm) =
Q
o
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