Agilent ADM Flow Meter Operating Instructions 15
Reading and Setting a Split Ratio
In split mode, you can store a flow measurement as a reference value, and then
compare subsequent flow measurement values as a ratio of the current measure-
ment to the reference measurement. This is useful when verifying or troubleshoot-
ing the operation of a Gas Chromatograph Inlet.
To read and set a split ratio:
1 With the unit switched on, repeatedly press the Power/Mode button until Split
mode is displayed.
2 Turn off the detector gases.
3 Connect the flexible tubing to the GC column gas flow.
4 Wait for the reading to stabilize (1 - 2 seconds).
5 Briefly press the Select button. The current reading is stored as the reference
value. The ratio value is displayed as 1:1.
6 Disconnect the flexible tubing from the GC column flow and then connect it to
the split vent, or the gas flow that you want to compare. The display shows the
ratio directly.
7 Adjust for the desired ratio by adjusting the flow of the split vent, or the other
reference flow, until the required ratio is displayed.
To clear the stored reference value, press the Select button.
NOTE
Accurate column flow rates can only be determined when detec-
tor gases have been turned off.
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