Janus FM-200 Sv Series - Low-Pressure Supervisory Switch; Sv Series Low-Pressure Supervisory Switch; MV and Lv Series Low-Pressure Supervisory Switch Assembly

Page: 15
FM-200® OPERATION, DESIGN, & SERVICE MANUAL
Revision F
Document # DOC102
Issued: February 1, 2009
Revised: 11-Nov-2011
40YE
Section 2 System Description and Components
2.2.2 Low-Pressure Supervisory Switch
e low-pressure supervisory switch continuously monitors the pressure within the cylinder. Should the cylinder
pressure drop to approximately 280 psi (19.3 bar), the switch contacts will close transmitting an abnormal signal
to the system control panel. e contact
conguration is single pole, single throw
(SPST) with contacts rated 1.5 Amps
at 24 VDC. e Sv Series low-pressure
supervisory switch diers from the Mv
and Lv Series low-pressure supervisory
switch in the method it is axed to the
cylinder valve.
2.2.2.1 Sv Series Low-Pressure Supervisory Switch
P/N 17032 (See Figure 2.2.2.1)
e Sv Series low-pressure supervisory switch is factory mounted to the cylinder valve between the rupture
disc and pilot actuation port. e Sv Series switch has 18 inch (457 mm) leads.
The Sv Series low-pressure supervisory switch is mounted directly to the cylinder valve and shall not be removed
while the contents are under pressure. Removal while the contents are under pressure will cause agent to
escape through the low-pressure supervisory switch connection and discharge the cylinder valve.
2.2.2.2 Mv and Lv Series Low-Pressure Supervisory Switch Assembly
P/N 18775 (See Figure 2.2.2.2)
e Mv and Lv Series low-pressure supervisory switch is tted with a swivel nut and O-ring seal to allow
it to attach to the Mv and Lv Series cylinder valves at the low-pressure supervisory switch connection.
e low-pressure supervisory switch ports of the Mv and Lv Series cylinder valves contain a Schrader
valve that seals when the
switch is absent. e Mv
and Lv Series switch has
36 inch (914 mm) leads.
Refer to Section 4.1.4.2
regarding installation
and removal of the low-
pressure supervisory switch
assembly.
0.90 in
22.86 mm
1.778 in
45.16 mm
18 in lead
457 mm
Figure 2.2.2.1 Sv Series Low-Pressure Supervisory Switch
The Mv and Lv Series cylinder assemblies shall not be transported with the low-pressure supervisory switch
assembly installed. Remove the low-pressure supervisory switch assembly from the cylinder valve before
transporting the Mv Series or Lv Series cylinder assembly.
1.01 in
25.7 mm
2.97 in
75.4 mm
36 in lead
914 mm
Figure 2.2.2.2 Mv and Lv Series Low-Pressure Supervisory Switch Assembly
The Mv and Lv Series low-pressure supervisory switch assembly shall not be removed from the cylinder valve
while the contents are under pressure. Removal while the contents are under pressure may damage the O-ring
seal or switch, requiring the replacement of the low-pressure supervisory switch assembly.
O-Ring
1
(P/N 18582)
1. O-Rings must be ordered in packs of 25 as P/N 98791