UNITED FIRE SYSTEMS -
NITROGEN-
PAC™
MODEL SC-W
INSTALLATION, COMMISSIONING, AND MAINTENANCE MANUAL
REVISION 1.01 MAR 2021 - P/N 30-NPWICM-000
16
1.12. (Optional) Corrosion Monitor Assembly
– Model CMA-1.
Refer to
Figure 11
. The Model CMA-1 Corrosion
Monitor Assembly is designed to monitor for possible corrosion inside the sprinkler piping. The assembly consists
of a corrosion probe in a chamber, a pressure switch, an isolation valve, and a drain valve. The corrosion probe,
when intact, keeps pressure from reaching the pressure switch. When corrosion perforates the probe, pressure
reaches the pressure switch, actuating a volt-free contact providing an early-warning signal of possible corrosion
occurring inside the piping. The isolation valve permits replacement of the corrosion probe without depressurizing
the entire system and the drain valve permits safe venting of pressure from the probe chamber.
Figure 11
Corrosion Monitor Assembly
– Model CMA-1
PRESSURE
SWITCH
CORROSION
PROBE CHAMBER
ISOLATION VALVE
(NORMALLY OPEN)
UNION
DRAIN VALVE
(NORMALLY CLOSED)
Summary of Contents for Nitrogen Pac SC-W
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