Monitor’s
line of tilt switches are economical, trouble-free point
level controls available for detection of dry bulk materials.
The units can be used as high level indicators to eliminate
bin overflow or to control levels in open piles. In addition,
the tilt switches are useful in determining over or under-load
on conveyor belts. The simple yet efficient internal construction
(one moving part) provides indication when unit is tilted
at a 17° angle throughout the complete 360° of axial
arc. Each tilt switch includes a threaded bore for attaching
extension actuators which can increase sensing repeatability
and protect the tilt switch from direct contact with coarse
material. Monitor offers two different models of tilt switches,
each suited to satisfy different application requirements.
A tilt
switch provides indication by detecting the angular position
of the tilt switch enclosure. Typically the unit is suspended
above the material to be sensed. Internally, a steel ball
centers itself over a switch resulting in switch actuation.
As rising material contacts the tilt switch (or the extension
actuator) the enclosure begins to tilt. When the enclosure
body is tilted at 17°, the steel ball rolls off center,
deactivating the switch. As material falls away from the
switch enclosure body (or the extension actuator) and the
unit becomes upright, the ball returns to its original centered
position, once again causing switch actuation. The change
in the internal switch status is user accessible for signaling
alarms, lights, or interfacing with a PLC.
Applications
Monitor’s
tilt switches can be used in a variety of applications and
with many different types of materials. The TC-3 can be
used with materials 15-60 lb/ft³ (240-960 kg/m³ ), while
the TC-1 can be used with materials >45 lb/ft³ (>720
kg/m³ ).
Typical Applications include, but
are not limited to:
Feed
Calcium Dust
Pellets
Wood
Limestone
Metals
Regrind
Rocks
Clays
Resin
Rubber
Malt
Silica Sand
Pre-mix
Features
Passive
switch for activating loads up to 250 VAC
Cast
iron or cast aluminum construction
Easy
installation
Adjustable
measurement height
Ball-float
and paddle-type actuators available
Available Configurations
TC-3
- Monitor’s model TC-3 is a light-duty tilt switch
constructed from cast aluminum. It is ideally suited
for applications where relatively light weight, moderately
sized materials are handled (i.e. 15-60lb/ft³ ; 240-960kg/m³
or particle sizes less than 2in; 50mm). Typical application
materials include feed, plastic pellets and pet food.
TC-1
- Monitor’s model TC-1 is a heavy-duty, weather-proof
tilt switch constructed from cast iron. It is ideally suited
for applications where heavy coarse materials are handled
(i.e. >45lb/ft³ ; >720kg/m³ or particle sizes
exceeding 2in; 50mm). Typical application materials include
coal, ore, rock, aggregate, and sand.
Specifications
Model
TC-3:
Power
Requirements:
none
Output:
SPDT,
10A @ 250 VAC max
Sensitivity:
17° from
vertical axis
Enclosure:
cast
aluminum, unpainted
Enclosure
Protection:
NEMA
4, IP56
Mounting
Connection:
eyebolt
(3/4" (19mm) inner diameter)
Wire
Entry:
3/8" NPT
cord connector cord diameter 0.25 to 0.38in (6.4
to 9.6mm)
Op.
Temp.:
-40° to
175°F (-40° to 79° C)
Weight:
3
lbs. (1.35 kg)
Approvals:
CE marking (Ordinary
Locations Only)
Model TC-1:
Power Requirements:
none
Output:
SPDT, 15A @ 250 VAC max
Sensitivity:
17° from vertical axis
Enclosure:
cast iron, painted beige
Enclosure Protection:
NEMA 4, IP56
Mounting Connection:
eyebolt (1-3/32" (27.7mm) inner diameter)
Wire Entry:
1/2" NPT cord connector cord diameter
0.25 to 0.38in (6.4 to 9.6mm)
Op. Temp.:
-40° to 250°F (-40° to 121° C)
Weight:
24 lbs. (11.25 kg)
Approvals:
CE Marking
Warranty
Monitor
Technologies warrants each tilt switch 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 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.
633A.7.0108
Global Flour Processor Uses Flexar® Guided Wave Radar
A large global flour processor and food products company recently began using the Flexar® guided wave radar in a total of eighteen (18) silos and bins to manage their finished product inventory. Readings from these continuous level sensors is reported as being reliable and accurate, even during pneumatic filling, contrary to their previous measuring system. A previous non-performing ultrasonic system was replaced by the Flexar level sensors. Flexar guided wave radar level sensors were chosen as the best for pneumatically filled dust laden flour silos.
Eight (8) Flexar level sensors are installed in load-out silos that fill bulk trucks with processed and finished flour. These silos are 12ft in diameter and 35ft tall. The finished flour is pneumatically conveyed into these silos. During filling the internal environment of the silos is very dusty and turbulent. The finished flour in these silos is used for loading bulk transport trucks for distribution. In addition, ten (10) Flexar level sensors are installed in 40ft high bins that contain bran. This material is also sent by bulk transport to end users.
All of the Flexar level sensors are equipped with an RS485 digital communications output that is connected to a PC with a graphical user interface for inventory management purposes. Monitor’s SiloTrack™ inventory management software is used by the facility to monitor and manage material inventories of both the finished flour and the bran. SiloTrack allows for multiple user viewing and data access via LAN and this is how the facility will be using the software that provides a flexible, graphical user interface, alarms, report generation and history analysis functions.
Guided wave radar is especially well suited to level measurement applications of dusty powder materials even when measuring during pneumatic filling. Flexar guided wave radar utilizes TDR (time domain reflectometry) technology. Radar pulses are continuously transmitted down the sensor’s probe and guided to the material surface where they are reflected back to the electronics along the wave guide. The time-of-flight of the pulses is measured and directly related to the distance to the material surface and its level.
TC-3
- Monitor’s model TC-3 is a light-duty tilt switch
constructed from cast aluminum. It is ideally suited
for applications where relatively light weight, moderately
sized materials are handled (i.e. 15-60lb/ft³ ; 240-960kg/m³
or particle sizes less than 2in; 50mm). Typical application
materials include feed, plastic pellets and pet food.
TC-1
- Monitor’s model TC-1 is a heavy-duty, weather-proof
tilt switch constructed from cast iron. It is ideally suited
for applications where heavy coarse materials are handled
(i.e. >45lb/ft³ ; >720kg/m³ or particle sizes
exceeding 2in; 50mm). Typical application materials include
coal, ore, rock, aggregate, and sand.
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