Parr Instrument Series 5100 - Manual (Page 9)

w w w . p a r r i n s t . c o m
5100 Low Pressure Reactors
9
Other Vessel Head Fittings
Safety Rupture Disc
There is a safety rupture disc attached to the head
which is intended to rupture and release the pres-
sure before it reaches a dangerous level. A metal tag
wired to the safety head identifies the burst pres-
sure at room temperature for that particular disc.
A similar tag is furnished with each replacement
disc. This tag must remain with the apparatus at all
times so that both present and future operators will
be aware of the disc rating. Users should read the
discussion of rupture discs given in the Instruction
Sheet No. 231M for a complete description of the
characteristics of rupture discs and the precautions
to be observed when operating pressure equipment
protected by this type of safety device. The disc is
rated for 1000 psi and should remain installed for
both glass and metal cylinders.
Pressure Gage
A pressure gage, typically 200 psi gage for glass
cylinders and 1000 psi gage for metal cylinders
includes a T316 Stainless Steel Bourdon tube. It
is mounted on the head using attachment fittings
similar to those used for the inlet/sampling valve
assembly.
Type J Thermocouple
A Type J thermocouple in a 1/8” diameter stainless
steel sheath is furnished with the reactor. Insert this
thermocouple into the head thermowell and con-
nect it to the thermocouple socket on the rear panel
of the reactor controller using the extension wire
furnished with the reactor.
Identify the Valves
Gas Inlet Valve
The gas inlet valve is easily identified when the
vessel is open by noting that it is connected to a
dip tube which extends to a point near the bottom
of the vessel cylinder. This is an angle valve with an
attached fitting which provides a socket for attaching
the A495HC pressure hose furnished with the reactor.
Gas Release Valve
The gas release valve is connected to the gage
adapter on vessels with volumes of 160 – 600 mL.
The gas release valve is installed in a port by itself
on 1 L & 1.5 L vessels. These ports do not have a
threaded connection on the underside of the head;
they are always open to the gas phase of the reactor.
Liquid Sampling Valve
The liquid sampling valve is attached to the same
fitting as the gas inlet valve and connected to a
common dip tube. With this arrangement, incoming
gas is always introduced below the surface of the
liquid and the operator is provided with a means for
clearing the dip tube to be sure that any sample taken
during a run will be representative of the charge. This
can be done by opening the upper gas inlet valve
momentarily to allow the inlet gas to force any liquid
in the dip tube back into the reactor before withdraw-
ing a sample from the sampling valve.
Relief Valve
The relief valve is connected to the gage adapter
and is pre-set to either 145 psi (CE certified) or 150
psi to ensure that the glass cylinder is not over-
charged. When using a metal cylinder, a plug is
provided so that the relief valve can be removed
(due to higher pressure rating of metal cylinder).
*See Page 30 for drawing of head fittings and valves.