Parr Instrument Series 5500 - Manual (Page 9)

Compact Micro Reactors
w w w . p a r r i n s t . c o m 9
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 cylinder. With this arrangement, incoming gas is
always introduced below the surface of the liquid.
This valve includes a coupling with an “A” socket
connection for attachment of the pressure hose.
Gas Release Valve
The gas release valve is typically connected to a side
opening on the gage adapter. Gas released from
this valve will be drawn from the top of the reactor.
Liquid Sampling Valve
The liquid sampling valve is attached to the same
fitting as the gas inlet valve and connected to the
same dip tube. This provides the operator 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 gas
valve momentarily to force any liquid in the dip tube
back into the reactor before withdrawing a sample
from the sampling valve.
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 pressure
before it reaches a dangerous level. A metal tag wired
to the safety head identifies the burst pressure 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 Operating Instruction No. 231M for
a complete description of the characteristics of rupture
discs and the precautions to be observed when op-
erating pressure equipment protected by this type of
safety device.
A typical pre-bulged disc can be used to 90% of the
rating on the tag. For additional protection, the user
should install an adequate and safe venting system
for removing any toxic, flammable or volatile mate-
rial which would be released if the rupture disc should
burst. A connector for attaching 3/8” OD tubing to the
discharge port of the rupture disc is provided for this
purpose.
Type J Thermocouple
A Type J Thermocouple in a 1/8” diameter Stainless
steel sheath is installed in each reactor. In reactors
made of alloys other than stainless steel, the stainless
thermocouple is installed in a thermowell made of the
same alloy as the vessel. Connect the thermocouple
to the socket on the rear panel of the reactor controller
using the extension wire furnished with the reactor.
Pressure Gage
The pressure gage furnished with this reactor has a
T316 Stainless Steel Bourdon tube. Gages are fur-
nished in a variety of ranges to meet individual needs.
Typically, the gage and the rupture disc are furnished
as matched ranges. For applications where a gage is
selected with a range under 1000 psi, a relief valve is
added and set to protect the gage. A 1000 psi rupture
disc is installed as the fail-safe vessel protection.
For highly corrosive applications where the vapor
phase might corrode the stainless Bourdon tube, Parr
offers isolator assemblies in a variety of materials.
These isolators with their internal piston isolate the
vapors from the gage.
PRESSURE
GAGE
LIQUID
SAMPLING
VALVE
GAS INLET
VALVE
GAS RELEASE
VALVE
THERMOCOUPLE
NOTE:
SAFETY RUPTURE DISC NOT
SHOWN IN THIS VIEW(LOCATED
BEHIND MAGNETIC DRIVE)
FOR PART NUMBERS AND
ADDITIONAL VIEWS SEE PG. 14
OPTIONAL
PRESSURE
TRANSDUCER
MAGNETIC
DRIVE
Head Fittings for Micro Reactor