Component Descriptions
April 2020 2-24 06-237619-001
2-8 NITROGEN PILOT SYSTEM AND PRESSURE DRIVEN ACCESSORIES
A Nitrogen pilot cylinder supplies pressure to run nitrogen powered discharge delays or pres-
sure operated sirens.
Note: These devices may be required per NFPA 2001, reference section 1.5.1.4.3
2-8.1 Nitrogen Discharge Delay Kits, P/N 38-401140-030
and P/N 38-401140-060
This device uses nitrogen pressure to provide a pneumatic (automatic mechanical) means to
delay the release of pilot media by a predetermined period following the initial actuation event.
The time delay consists of a metering tube, a cylinder and a differential pressure-operated
valve with a control port. The control port allows the connection of a lever operated control
head that can be operated to bypass the delay.
Two versions are available with factory preset (non-adjustable) delay. Both versions include
the necessary adapters to connect the discharge delay to the pressure regulator using a back-
plate manifold hose also included in the kit. The kits also include the adapters to connect the
pressure regulator to the cylinder valve using an actuation hose (P/N 38-401110-X00 or 38-
401130-X00). See Figure 2-31 and Table 2-23 for more details.
Figure 2-31. Discharge Delays (30/60 sec.)
WARNING
Discharge Delays and Sirens must be driven by a dedicated Nitrogen pilot
cylinder. Do not use agent cylinders to drive the discharge delay or siren. The
agent cylinders operate at a different pressure and would not operate a
discharge delay or siren as listed.
Table 2-23. Discharge Delays
Part Number Agent Nominal Delay Time Approx. Type of Metering Tube
38-401140-030 Nitrogen 34 Curled
38-401140-060 Nitrogen 61 Curled
1-1/4”
17.87"
(454 mm)
3.56"
(90 mm)
DIA.
4.43"
(113 mm)
FILTER
TYPICAL
NAMEPLATE
PRESSURE
INLET
3/4” NPT
FEMALE
METERING TUBE
ACCUMULATOR
-18 NF-3 MALE
FOR ATTACHMENT
OF CONTROL HEAD
TO OVERRIDE
DISCHARGE DELAY
3/4” NPT
OUTLET
FEMALE
VALVE
INLET AND OUTLET MAY
BE REDUCED WITH
BUSHING OR BELL
REDUCER AND NIPPLE TO
½” NPT IF NECESSARY.
OUT
IN
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