VACUUM
FILL IN THE LABORATORY
Multiple Gauge/Switch
on Isolator Ring Assemblies
FILLING AND
MOUNTING PROCEDURES
1. Manually
fill seal through instrument port with fill medium specified
by customer and massage diaphragm until all air is displaced.
2. Mount tree
assembly, if applicable, into the instrument port and
manually fill, making sure all air is displaced by tapping
with a mallet
as necessary until no more air bubbles are visible. Set this
assembly aside, making sure not to lose any fill medium.
3. Take instruments
(gauge and/or pressure switch), remove orifice or other restrictions,
if applicable, and vacuum fill with medium. This is accomplished
by drawing a vacuum with a vacuum pump on the instrument tube
or bellows assembly; directly through the fill medium, relieve
the vacuum quickly allowing medium to fill evacuated tube
or bellows directly without chance of air entrapment.
4. Replace orifice
restrictor if applicable.
5. Mount instruments
on tree/seal assembly in the orientation desired by the customer.
TESTING PROCEDURES
1. Mate flanged
seal with proper size blank flanges. One flange must have
test port in side of flange.
2. Pressurize
flange assembly to full scale of instrument, and then drop
pressure to zero. Repeat two or three times to insure repeatability
and to exercise the diaphragm assembly.
3. a) Pressurize
to 1/4 of instrument scale, note reading.
b)
Pressurize to 1/2 of instrument scale, and note reading.
c) Pressurize
to 3/4 scale, and note reading.
4. Pressurize
assembly above 3/4 of instrument scale, and decrease pressure
to 3/4, and note reading. Decrease to 1/2 scale, and note
reading. Decrease to 1/4 scale, and note reading. Repeat two
or three times to check for repeatability.
Note: Pressure
switches in an assembly must be tested at the same time as
the companion pressure gauge by connecting a Digital Multimeter
across switch terminals. Switch is to be set at customer specified
set point, and continuity and deadband operation checked during
upscale/downscale pressurizations.
5. Filled Systems
should be tested for 24/48 hours under pressure to insure
that fittings/ferrules are not defective and are not allowing
miniscule leaks which cause premature failure.
6. After installation,
it is impossible to warrant these systems, as any movement
of any of the fittings and connections, however slight, can
cause failure. Excessive vibration, stepping on the tree or
leaning on the tree, or personnel turning or even just attempting
to turn the instruments for a better viewing angle all can
cause failure by causing leaks of the fill system. Any and
all of these are beyond the control and scope of Branom Instrument
Company.
The Ultimate
Solution:
The Onyx Isolator
Ring solves these problems with its new, patented design.
The isolator is vacuum filled at the factory with a high viscosity
silicone fluid, then permanently sealed with our revolutionary
"Module-Seal". There is no fill port anywhere on the assembly!
Gauges, switches, and transmitters are supplied separately,
pre-filled with our special fitting attached. Select any combination
of isolator ring and gauge, and snap together.
Practical Industry Applications
Of The Onyx Isolator Ring
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The Onyx Isolator Ring can be used
in a wide variety of industries, such as chemical, food
& beverage, mining, pulp & paper and wastewater treatment.
Typical applications include:
- line pressure measurement of
slurries, corrosives and difficult fluids
- tank level indication
- monitoring pressure on long distance
transmission lines to detect line breakage
- monitoring pressure drops across
a filter or pump using two pressure sensors with a
differential pressure switch
- measuring the output pressure
of a pump
- sending a signal to stop a pump
or open a by-pass valve
Proven Benefits Of The Onyx Isolator
Ring
- Gauges can be removed or replaced
without interrupting process
- Gauges can be replaced without
vacuum filling
- No tools required to change pressure
instrument (simply remove and replace by turning the
knurled collar)
- No snubber required (needle functions
as built-in snubber)
- Improved safety (process liquid
cannot escape if gauge is removed, even if process
pipe is under pressure)
- High accuracy (because air can
never get into the system)
- No isolation valve required
- Gauges can be rotated by hand
to face any direction
- Isolation rings and gauges can
be stocked separately (combine as needed on the spot)
- Sturdy mounting for heavy gauges
and multiple instruments (robust 0.87" dia. mounting
post resists breakage; up to three gauges, pressure
switches and transmitters can be combined on one isolator
without additional support)
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