4 Operations/Analysis Unit
or | 85 ppm simulated water using |
| span flag on top of dry liquid TDI |
| delta 80 ppm agreement on slope |
| sensitivity. |
or | |
0 ppm water in N2 | 5 ppm water on the 5000B meter |
| or output with zero-flag/offset |
| intro. |
0 ppm water in N2 | delta 80 ppm simulated sensitivity |
| change of water. |
Note: the span flag checks the sensitivity change of the 5000B and not the zero drift of the analyzer. The mole sieve dried TDI checks the zero of the instrument provided it can be reproduce the zero by consistently removing all the water to the same ppm level, (somewhere in the 2-10 ppm water range). The long term efficiency of removing the water by mole-sieve contact should be known for the customers process fluid, otherwise the customer should have an acceptable off line lab technique to analyze prepared samples be fore intro into the 5020 field analyzer. With Teledyne’s approach, using N2 as the dry background for both zero and span checks, eliminates the concern of the mole-sieve being saturated with time. Indeed, the N2 Nitrogen background approach can be used to verify the inefficiency of the mole-sieve (saturation). Teledyne prefers this approach using easily reproducible N2 since it is much simpler to flush out the sample cell and check the instrument provided the original calibration on TDI is used to set up the zero and span instruments of the optical filters. See attached piping on how the appropriate valves are operated to switch in N2 in the reverse mode to provide a stable zero and or span check.
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TeledyneAnalyticalInstruments
A Business Unit of Teledyne Electronic Technologies
