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TILT SWITCHES
Low Cost, High Level Detection
No Calibration
Minimal Maintenance

 

BULLETIN 633

 

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.

.: Principle of Operation

.: Applications

.: Features

.: Available Configurations

.: Specifications

.: Warranty

 

 
Principle of Operation

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

 

 

 
Flexar® GWR  
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.

 

>>Click here for more information about Flexar guided wave radar continuous level measurement sensors.
>>Download Product Bulletin 353A
>>Click here to visit our Flexar Website


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