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Industrial Process Equipment |
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High
Quality Products - Long-Term Reliability |
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 BPS
400
The BPS 400 is a differential pressure sensor
designed to detect the pressure difference between the "dirty"
and "clean" sides of a bag house or dust collector. For
years attempts at measuring the differential pressure in a dust collector
have been foiled because all the pressure sensing devices on the market
have a common problem: the tubing ports connecting the "dirty"
side of the process become clogged with dust. When the process tubing
becomes clogged, pressure readings will be inaccurate. The BPS 400
has no ports to clog on the dirty side of the process, thus allowing
accurate and reliable pressure measurement.
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Cycle
Timer vs. On-Demand Cleaning
Most dust collectors clean or backwash the filters
at regular intervals controlled by a cycle timer. Ironically, many
users have tried "on-demand" filter cleaning, based on differential
pressure, only to return to cycle timers, because the pressure sensor
proved to be unreliable because of clogged tubing connections. When
filters are cleaned based on time intervals alone, they are cleaned
whether they need to be or not; plant air is wasted and reduced filter
life results in premature filter changes. Additionally, over cleaning
a filter lowers its efficiency by removing the small "cake"
on the filter, which helps contain the most finely divided particles.
As the filter bags or filter cartridges become dirty, the differential
pressure across the tube sheet increases. If the filters are cleaned
based on differential pressure, rather than a cycle timer, they will
be cleaned only when necessary. On-demand cleaning saves plant air,
reduces the number of cleaning cycles, thereby extending filter life,
and will not "over-clean" the filter. The BPS 400 provides
the reliable differential pressure measurement to make on-demand cleaning
a reality.
Accurate and reliable differential pressure measurement in a dust
collector also gives the user the ability to monitor the process for
upset conditions and optimum performance.
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Construction
The BPS 400 is a self contained strain gauge type
pressure sensor, featuring a food grade silicone diaphragm on the
"dirty side" and Teflon laminated fabric on the "clean
side". The mounting plate is made of stainless steel. A junction
box with cord grip is provided for electrical connections. A 1/4 inch
female NPT nipple is welded to the mounting plate to facilitate the
installation of a reference port to the clean side of the dust collector
when side mounting installation is preferred.
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Mounting
The BPS 400 is designed to mount directly on
the tube sheet, replacing one of the filter bags. The silicone diaphragm
faces the dirty side of the process. If the application cannot afford
the loss of one filter, or if mounting the unit on the tube sheet
is impractical, the BPS 400 can be mounted on the side wall of the
dust collector, and a vent line run to the clean side of the process.
Mounting is accomplished with eight bolts
and nuts. A mounting ring made of UHMWPE is provided with each unit
and may be used in lieu of the nuts; this "hides" the
threads for more sanitary applications, and will not allow an individual
nut to come loose and fall into the process.
The optional MP-1 mounting plate can facilitate mounting without
the need for personnel to enter the collector for mounting or maintenance.
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Control
Options
The BPS 400 is a strain gauge type sensor, so
the hook-up is the same as that for any 4-wire load cell. Any common
load cell or strain gauge controller will provide the required excitation
voltage, and will condition the signal for use with a programmable
controller, chart recorder or panel meter.
Babbitt International
offers two standard control packages for use with the BPS 400.
BPS 402 Control Panel
The BPS 402 is a complete system for dP indication, alarming and backwash/cleaning
cycle control. It also provides a 4-20mA analog signal output.
API 4058G
The API 4058G is a DIN rail mounted strain gauge transmitter.
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Specifications |
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| Rated
Capacity (R.C.): |
14
inches W.C. |
| Rated
Output (R.O.): |
Approx.
1mV/V |
| Non-Linearity: |
0.02%
R.O. |
| Hysteresis: |
0.02%
R.O. |
| Repeatability: |
0.02%
R.O. |
| Creep: |
0.02%
R.O./20 min. |
| Creep
Recovery: |
0.02%
R.O./20 min. |
| Safe
Overload: |
300%
R.C. |
| Excitation: |
10V
recommended;
15V maximum. |
| Terminal
Resistance, Output: |
350ohms, +/-5ohms |
| Temperature: |
Standard:
-4 to 340 deg F
Optional: -58 to +392 deg F
UHMWPE Ring: 200 deg F max.
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| Weight: |
24
ounces |
| Specifications
are subject to change without notice. |
Ordering
Information
Part No. BPS-400 includes the sensor with silicone
diaphragm, 304SS mounting plate and plastic outdoor junction box for
wiring.
Part No. BPS-402 includes the
NEMA 4 control panel with 115VAC supply voltage, digital LED display,
intrinsically-safe barrier, 2 10A DPDT relays, "CLEANING"
and "HIGH PRESSURE" indicator lamps and a 4-20mA output.
Part No. API-4058G strain gauge
transmitter with selectable outputs, 115VAC power.
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