Section 4
Calibration
4-3
4.
View water channels
Press
F3
or
F4
to make the water IRGAs the active ones.
5.
Wait for equilibrium
Watch the rates of change (slopes). If you are using Option A
(connected to sample, Match On), then be prepared to wait about 20
minutes, until the rise in sample and reference concentration is
negligible. If you are plumbed for Option B (sample and reference
connected), ignore the sample, and only wait for the reference to
equilibrate. 3 to 5 minutes should be adequate.
6.
Adjust the reference gain as needed
When Td_R_°C is highlighted, press
↑
and
↓
to adjust the H
2
O
reference IRGA’s span factor until Td_R_°C reads correctly (Figure
4-6).
)
Figure 4-6. Adjusting the H
2
O span. Adjust until the displayed dewpoint
value (18.75 in the example above) matches the LI-610 set point.
7.
Select the sample IRGA
Press
→
(or
f4
)to highlight Td_S_°C.
If you are plumbed for Option B, continue with Step 8.
If you ’re plumbed for Option A, press
↑
and
↓
to adjust Td_S_°C
until it reads correctly. You are done.
8.
Match mode ON
Press
M
to make the Mch:indicator read ON.
