Bulletin 254
May 2019
Page 2 of 7
www.reliablesprinkler.com
Model NS-ASAM
Technical Specifications
Threads:
1/2” NPT
Min. Inlet Pressure:
100 psi (6.9 bar)
Max. Inlet Pressure:
250 psi (17.2 bar)
Min. Outlet Pressure:
10 psi (0.7 bar)
Max. Outlet Pressure:
70 psi (4.8 bar)
Listings and Approvals
cULus Listed
FM Approved
System Operation
Primary and secondary sources of nitrogen or air are con-
nected to the primary and secondary inlets, respectively,
of the Model NS-ASAM Pressure Maintenance Device. The
primary and secondary nitrogen or air sources should sup-
ply a recommended pressure of 120 psi (8.3 bar) to the
NS-ASAM, although a minimum pressure of 100 psi (6.9
bar) up to a maximum pressure of 250 psi (17.2 bar) are
permitted. The NS-ASAM will admit nitrogen or air from the
primary source, until the primary source depletes to a pres-
sure of approximately 80 psi (5.5 bar). Nitrogen or air from
the secondary source is admitted through the NS-ASAM,
when the pressure of the nitrogen or air supplied by the
primary source is less than approximately 80 psi (5.5 bar).
A pressure switch in the NS-ASAM is factory-set to activate
at a pressure of 90 psi (6.2 bar) to indicate depletion of
the primary source. The pressure switch includes an aux-
iliary set of contacts that may be field adjusted to indicate
loss of pressure from the secondary source. The system
pressure may be set with the system pressure regulator of
the NS-ASAM. A bypass valve is provided to rapidly intro-
duce nitrogen or air into the system. Individual low-pressure
switches (not provided) should be installed in the dry pipe
or preaction valve trim to indicate low system pressure.
Model NS-ASAM Dimensions
Figure 1
