Intek RheoVac SENTRY User Manual

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The next figure shows typical recommended installation locations for probes in a condenser system
where five probes are desirable and for hands free remote condenser system diagnostics. The location
for each of the five probes is identified by a number which is used in the subsequent discussions with
respect to identifying performance information.

As examples of the performance data provided by the RheoVac probe, note that it measures the flow rate
into the vacuum pump (or air ejector) and distinguishes between air flow and water vapor flow, making
it possible to quantify the performance of the condenser’s exhausting equipment. A measurement at the
pump (or air ejector) discharge cannot provide this information.

Additionally, the RheoVac system provides recordable, real-time air in-leak measurements and will
respond to changes of air in-leak flow within 1 minute. Therefore, it can be used to quantify each source
of air in-leakage as repairs are made.

Examination of the measured air in-leak data from the installed probes will provide information on the
likely location(s) of the leaks which give rise to the measured air in-leak values. The following chart
shows indications that can be expected for the locations of different leaks. This table is prepared based
on a five-probe installation, as shown in the figure above.

Leak Location

Probe Indications of Air In-Leak (SCFM) and Plant DO

Below water line, left side of

Much higher than normal DO,
1 > 2,
1 + 2 = 3 = 4 + 5,
4 = 5 This implies pumps are working id entically.

Above water line, right side of

Slightly higher or normal DO,
2 > 1,
1 + 2 = 3 = 4 + 5,
4 = 5 (Identically working pumps)

Figure 16 - A RheoVac SENTRY System Configuration