Single
Probe Vibrating Rod Design Used For Most Powders & Solids
Easy Setup - No Calibration
Universal Power Supply
No
Clogging/Bridging Like Tuning Fork Designs
Unaffected
by Environmental & Material Changes - No Calibration
Variety of Probe Configurations
Pipe & Cable
Extension Units Available
Standard
Version with Plastic or Aluminum Enclosure
Hazardous Location Approvals
Addendum (January 2010):
Ordinary Location
Unit Only -
> New universal power supply (20-255V AC/DC)
> Inserted portion of probe has been shortened by 1.1 inches
(28mm) to withstand stronger lateral forces. Click
Here For Details and New Dimensions.
The VibraRod™ vibrating
rod sensor provides reliable point level sensing in a wide
variety of applications within powder and bulk solids markets.
The vibrating probe principle utilized by the VibraRod overcomes
typical application difficulties associated with changes
in material, electrical dielectric constant, temperature
or humidity while providing reliable solid state electronic
circuitry that requires no calibration. The VibraRod has
the ability to detect a wide range of material densities.
The VibraRod line
of vibrating rod point level sensors is offered in standard
length, cable extension or pipe extension versions. The standard
length version extends into your vessel approximately 9 inches
(235 mm). The pipe extended version can be used to extend
the measuring rod up to 120 inches (3 m) and the cable extended
unit can be used to extend the probe up to about 65 feet
(20 m). Each version can be provided with either a plastic
or aluminum housing. VibraRod units
are provided with local indication using a bi-color LED and
a traditional relay output.
The VibraRod™ line
of point level sensors is a mechanical resonance system that
is excited and kept in resonance by the sensor's electronic
circuitry. Two piezoelectric crystals are mounted on the
internal portion of the probe’s base. An electrical
signal is applied to one crystal at the frequency corresponding
to the probe’s self-resonance. This electrical excitation
causes physical deformation of the crystal which in-turn
creates probe vibration. When no material is present around
the VibraRod's
probe, the vibration of the probe is received by the second
crystal. This causes physical deformation of the second crystal
which generates a voltage analyzed by the electronic circuitry.
With material present and surrounding the probe, the vibration
is dampened so that the second crystal is not able to generate
as high a voltage as when no material is present. The electronic
circuitry senses this change and the relay output changes
accordingly.
The VibraRod™ level
sensor provides reliable point level sensing in a wide variety
of applications for most bulk solid materials. The single-prong
vibrating rod principle requires no calibration, is easily
setup and eliminates the application problems associated
with build-up and clogging between tines on a typical "tuning
fork" device. The VibraRod is
ideal for bulk solids ranging from 3.12 lbs/ft³ (0.05 kg/dm³ )
with a maximum particle size of about 3/8 inches (10 mm)
and is even self-cleaning via vibration in many applications.
Typical Applications include, but
are not limited to:
Food Products
Chemicals
Clay
Sawdust
Fly Ash
Grain
Carbon
Black
Plastics
Lime
Sand
Cement
Feed
Pellets
Rice
Flour
Tobacco
Features
SINGLE-PRONG
PROBE DESIGN
The VibraRod™ provides
a probe design superior to "tuning fork" devices and
eliminates problems associated with build-up between tines of
"tuning fork" devices. In addition, the VibraRod's
vibration acts as a self-cleaning effect for most materials,
which can further eliminate problems. The reinforced 316 stainless
steel rod provides a high
level of corrosion resistance suitable for virtually any application.
IMMUNE
TO CHANGES
The unique design of the VibraRod level
sensor makes it immune to changes in many different application
variables including:
Vessel
contents
Material
composition
Density
of material
Dielectric
constant
Particle
size
Moisture
content
Pressure and Humidity
Temperature
NO
CALIBRATION REQUIRED
The VibraRod level
sensor is very easy to use. Unlike RF Capacitance type sensors,
no calibration is required. Simple switch adjustments for time
delay, fail-safe and sensitivity are all that is required to
setup and use the VibraRod point
level sensor.
SELECTABLE
FAIL-SAFE MODE
The VibraRod is
selectable for high or low fail-safe mode. This allows the
user to set the output "state" upon alarm activation
and power failure.
LOCAL
INDICATION
Each VibraRod level
sensor includes a bi-color LED to indicate power and material
absence/presence (Ordinary location sensors only).
UNIVERSAL
POWER SUPPLY
All VibraRod level
sensors can be provided in either a high or low voltage design.
The high voltage design can be used with 85-265VAC and 120-375VDC.
The low voltage design requires either 16-40VAC or 19-55VDC.
This added flexibility allows two power supply ranges to cover
all possible requirements.
CHOICE
OF HOUSING MATERIALS
A choice of either plastic or aluminum is offered.
CHOICE
OF PROBE CONFIGURATIONS
Flexibility for virtually any bulk solids point level application
(top or side mounted) is enhanced with a choice of three probe
configurations: Standard, Cable Extension and Pipe Extension.
HAZARDOUS
LOCATION VERSION
The Standard, Pipe Extended and Cable Extended configurations
of the VibraRod level
sensor (aluminum housing only) can be provided with ATEX hazardous
area certification. This allows the VibraRod to
be used in areas where hazardous explosive dust is present.
Available Configurations
STANDARD
PROBE
The standard probe is approximately 9-1/4 inches (235 mm)
in length and is suitable for both top and side mount applications.
It mounts to the vessel with a 1-1/2" NPT or BSP connection.
PIPE
EXTENSION PROBE
For high and low level applications that extend beyond the
length of the standard probe, the VibraRod™ can
be provided with a pipe extension probe. This configuration
is intended for top mount applications only. The extension
is constructed of 1" stainless steel pipe, which provides
structural strength and affords a means to secure the assembly
to the vessel. The pipe extension probe is available in lengths
up to 10 feet (3 m) in length. The unit mounts to the vessel
with a 1-1/2" NPT or BSP connection.
CABLE
EXTENSION PROBE
The cable extension probe configuration extends the detection
length beyond the standard and pipe extension probes. This
version of the VibraRod level
sensor is for use in top mount applications only and can be
used for both high and low level applications. A polyethylene
(PE) coated steel reinforced cable is used for the extension
and is available in lengths up to 65 feet (20 m). The unit
mounts to the vessel with a 1-1/2" NPT or BSP connection.
Specifications
Power
Requirements:
High
Voltage:
85-265VAC(50/60Hz)
or 120-375VDC
Low
Voltage:
16-40VAC(50/60Hz)
or 19-55VDC
Power
Consumption:
High
Voltage:
≥ 2.5VA
(AC); 1.2W (DC)
Low
Voltage:
≥ 2.5VA
(AC); 1.3W (DC)
*Process
Temperature:
Std.
Probe:
-22° to
230° F (-30° to 110° C)
Pipe
Ext. Probe:
-22° to
230° F (-30° to 110° C)
Cable
Ext Probe:
-13° to
194° F (-25° to 90° C)
Ambient
Temp:
-22° to
140° F (-30° to 60° C) all units
Output
Relay:
SPDT
isolated; 8A @ 250VAC max
Sensitivity:
3.12lbs/ft³
(0.05kg/dm³ ) min density (max particle size=3/8in(10mm);
Switch Selectable: High (>6.24lbs/ft³ or 0.1kg/dm³ )
or Low (≤ 6.24lbs/ft³ or 0.1kg/dm³ )
Time
Delay:
Switch
Selectable:
On-Delay (when immersed):
<1.8 sec OR 5 ± 1.5
sec;
Off-Delay (when free of material):
<2 sec OR 5 ± 1.5
sec
Bi-color
LED; Red indicates de-energized relay and output "on";
Green indicates energized relay and output "off";
No LED illuminated indicates improper supply voltage
or damaged circuitry
Probe
Material:
Std.
Probe:
316Ti
SS (DIN 1.4571)
Pipe
Ext. Probe:
Probe is 316Ti
SS (DIN 1.4571); 1" pipe is 316 or 316Ti
(Europe Only; DIN 1.4571)
Cable
Ext. Probe:
Probe is 316Ti
SS (DIN 1.4571) Polyethylene coated, steel reinforced
cable; max 65ft (20m)
CE Mark
ATEX(EX) II 1/2 D IP 65 (T rating
dependent on model, consult factory) (zone 20/21)
* Influenced
by the ambient temperature. Refer to Installation & Operation
manual for details.
Warranty
Monitor
Technologies LLC warrants each VibraRod™ it
manufactures to be free from defects in material and workmanship
under normal use and service for two (2) years from the date
of purchase. The purchaser must notify Monitor of any defects
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 does not apply
to any product which is repaired or altered outside of Monitor
Technologies' 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-000-533A
Rev.3.12052008
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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