Panametrics Aurora H2O, User Manual

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Aurora H2O User’s Manual 3
Chapter 7. Troubleshooting
7.5 No Flow Measurement Indicated on Aurora H2O Measurement Cell Outlet
Check to make sure that the outlet of the Aurora H2O is venting to atmospheric pressure. Ensure that the sample
system valves are configured correctly and that the Aurora H2O internal pressure regulator is capable of a barely
positive pressure setting. Check/Replace the filter element in the coalescer/filter as described in Chapter 5,
Maintenance .
7.6 Verifying Aurora H2O Performance in the Field
There are two methods for verifying the performance of the Aurora H2O in the field. The first method is to use a
portable hygrometer such as BH's PM880 portable hygrometer. The second method is to use a moisture generator or
standard gas cylinder.
7.6.1 Using A Portable Hygrometer
One quick spot check that can be done, that is relatively easy to do and requires minimal set-up time and no
consumables, is to use a second hygrometer. BH recommends using a PM880 Portable Hygrometer (see Figure 104
below) for this purpose, with a recently calibrated Aluminum Oxide Moisture Probe .
Figure 104: PM880 Portable Hygrometer
The PM880 can be connected to the outlet of the Aurora H2O analyzer, using the portable sample system with the
aluminum oxide moisture probe, to verify the system. The response time of the portable hygrometer is limited, as the
sensor is typically exposed to air during movement to the sample point. So, it is recommended that the sample gas
remains flowing through the portable sample system on the sample outlet of the Aurora H2O until equilibrium with
the moisture concentration of the sample gas is reached. You can use the data-logging capability of the PM880 to
determine when steady-state conditions are reached. Consult BH if you have application questions regarding this
process.