Emerson Mobrey Hydratect 2462, Справочное руководство

Страница: 11 / 66

5
Reference Manual
24625020, Rev AA
Introduction
March 2017
Introduction
Figure 1-2. High Water Level Detection in Drain Pot
A. Superheat steam line. D. Drain line.
B. Drain pot. E. High alarm signal.
C. Isolation valve. F. In-line manifold with two electrodes (channels 1 and 2).
1.5.2 Water level detection in a boiler drum
A Hydratect 2462 system for detecting high and low water levels in a boiler drum is shown
in
Figure 1-3 on page 6 .
Trip signals are validated by connecting both Hydratect channels using a “two-out-of-two”
configuration in a Hydratect 2462 Electronics Control Unit. For example, the high-level trip
signal occurs only when water is detected at both the high and the high-high water level
electrodes. Further information is in
Section 3: Installing the Electronics Control Unit .
The illustrated Hydratect 2462 system uses a sidearm manifold for detecting intermediate
water levels between high and low. Connection information for the manifold pipework is in
Figure 1-4 on page 6 .
Note the following points:

The connecting pipework must be sloped as indicated in Figure 1-4 on page 6 .
This is done to ensure a flow of condensate through the manifold.

The isolating valves, when opened, should allow unrestricted flow through the
manifold. Globe valves are highly recommended. These valves should be installed
with the handle spindle horizontal.

The connecting pipework must be insulated, as shown by the dashed lines marked
in
Figure 1-4 on page 6 .
A
B
C
D
C
F
E