The DustAlarm® Broken Bag Detector provides
reliable and economical detection of leaks and filter failures
in many powder and bulk solids industries. The DustAlarm
is successfully utilized in a wide variety of applications
where detection of dust levels is critical either to safety,
maintenance, equipment operation, plant efficiency and/or
the environment. The DustAlarm measures the triboelectric
effect to determine when particle emissions exceed acceptable
levels.
The DustAlarm Broken Bag Detector incorporates visual indications
and a relay output to maximize its user-friendliness and
automation capabilities. A reference point is set by the
sensitivity control adjustment, aided by the tri-color LED.
The alarm point is set by an alarm level control adjustment.
The
relay output can be used to activate an alarm device or can
be integrated into a control system to enhance the overall
operation of the dust collector.
Triboelectric measurement, which has been
used for broken bag detection for many years. Also known
as particle impingement or frictional electrification, the
triboelectric effect pertains to the resulting charge transfer
when one material rubs or impacts another.The result of dust
particle collision with a stainless steel probe is the generation
of electrical signals, which are continuously monitored and
analyzed by the electronics. When the signal exceeds a preset
level, a time delay is initiated. If the signal remains above
the preset level for the duration of the delay, alarm relay
outputs are energized.
The DustAlarm® Broken Bag Detector is designed specifically
for broken bag detection and leaking filter detection in
the exhaust ducts of baghouses, cartridge collectors, cyclones,
and any other dust collector containing filters which may
break or wear out.
Typical Applications include,
but are not limited to:
Ferrous Metals
Food Processing
Utilities
Non-Ferrous Metals
Feed
Chemical Processing
Pharmaceutical
Mining and Minerals
Foundries
Features
SENSITIVITY
ADJUSTMENT
The tri-color SIGNAL LED guides the user through the sensitivity adjustment
procedure. This LED can be yellow, green or red. While the dust collector is
running efficiently and clean, the user adjusts the sensitivity until the LED
is green.
ALARM
POINT ADJUSTMENT
The alarm point is adjusted by setting the Alarm LEVEL control (1 to 10 times
the baseline signal level). The emission level exceeds the alarm point,is indicated
by illuminating the SIG>LEVEL LED.
TIME
DELAY
The time delay feature enhances operation and control minimizing the occurrence
of false signals that might occur during normal operation and cleaning cycles
of the dust collector. The time delay provides a 0 to 60 second or 0 to 10
minute adjustment.
RUGGED
CONSTRUCTION
The rugged NEMA 4 housing is to be used in general purpose environments and
incorporates a screw-on/off cover for easy access to the adjustments, a cover
lock mechanism and convenient LEDs used during installation and setup.
UNIQUE
PROBE DESIGN
The sensing probe is 316 stainless steel with a specially designed PFA extended
insulator that helps protect the unit from false signaling due to product build
up.
QUICK-DISCONNECT
MOUNTING
The quick-disconnect mounting coupling provided with each unit is used
to mount the DustAlarm to
the exhaust duct or pipe and simplify the removal of the device if necessary
to clean the probe.
Options
Remote Probe/Electronics – The DustAlarm is available
in a remote electronics/remote probe configuration for high
temperature applications up to 450°F (235°C).
Specifications
ELECTRONICS:
Power
Requirements:
Low
Voltage AC:
105
to 130 VAC, 50/60Hz
High
Voltage AC:
210
to 260 VAC, 50/60Hz
Low
Voltage DC:
10
to 32 VDC
Process
Temp:
up
to 160°F (70°C); up to 450°F (235°C)
for remote probe electronics option
Ambient
Temp:
-20° to
150°F (-30° to 65°C)
Output:
(2)
SPDT isolated relay contact sets; 5 amps @ 250VAC
max or 30VDC
Sensitivity
Range:
0.0005
grains/dscf (1 mg.m³) typical detection at
maximum sensitivity; 100 to 1 adjustable range
Smoothing:
Adjustable
from 0.1 to 22 seconds
Sensitivity
Setpoint:
Baseline
level setting indicated by tri-color LED
Alarm
Threshold:
Adjustable
from 1 to 10 times baseline
Alarm
Time Delay:
Adjustable
range 0 to 60 seconds or 0 to 10 minutes; via
range selector and single-turn control
Fail-Safe:
Alarm condition on power failure
Electrical
Connections:
(2)
3/4" NPT conduit connection; (2) cable
glands suitable of sealing cords with diameter
of 0.25
in (6.4 mm) to 0.48 in (12.2 mm) are provided
Indicators:
Tri-Color
LED indicating: "Low"= Yellow;
"OK" =
Green; "High" = Red
SIG>LEVEL = Yellow
ALARM LED = Red
Housing:
NEMA
4, IP65; Designed for general purpose locations
Cover
Lock :
1/16" Allen-Wrench
PROBE:
Architecture:
Integrally
or remote mounted to electronics housing
Mounting:
Quick-Disconnect
fitting with ferrule, clamp and gasket
Pressure:
30
psi (2 bar) maximum
Insulator
Material:
PFA,
extended length
Probe:
3/8" diameter,
316 SS
Probe
Length:
3
in (76 mm), 6 in (152 mm), 12 in (305 mm) standard;
consult factory for custom lengths
Listings/Approvals:
CE
Mark
Warranty
Monitor Technologies LLC warrants each DustAlarm® Broken
Bag Detector it manufactures to be free from defects in material
and workmanship under normal use and service within two (2)
years from the date of purchase. The purchaser must give
notice of an defect to Monitor Technologies LLC within the
warranty period, return the product intact and prepay transportation
charges. The obligation of Monitor Technologies LLC under
this warranty is limited to repair or replacement at its
factory. This warranty shall not apply to any product which
is repaired or altered outside of the Monitor Technologies
LLC factory, or which has been subject to misuse, negligence,
accident, incorrect wiring by others or improper installation.
Monitor Technologies LLC reserves the right to change the
design and/or specifications without prior notice.
DOC-000-723A
Rev.9.10032008
Spotlight: True Fail Safe Level Switch
SafePoint®
"Truly" Fail-Safe Level Switch
The
SafePoint® rotary paddle level switch with a self-validating design
detects material presence plus continuously monitors its own ability
to function. The analysis includes sensor health and system power
failure, which makes the SafePoint truly fail-safe.
The SafePoint incorporates patented use of Hall-Effect technology,
dual outputs to indicate both material presence and unit health,
and microcontroller technology to continuously protect bulk solids
processing and storage from the consequences of unknown sensor
failure by providing immediate indication of a sensor failure
and confirmation of proper operation.
Other practical features of the SafePoint include rugged construction,
motor shut-off when paddle becomes impeded to maximize motor life, twist On/Off
cover for bolt free removal, and local status indicating light (except hazardous
location models)
A practical application for the SafePoint would be to use this "true"
fail-safe product if undetected sensor failure could result in a
catastrophic process problem.
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