• Twist On/Off Cover - No More Bolts!
  • Motor Shuts Off When Paddle Is Impeded
  • Significantly Extends Motor Life
  • Reduces Maintenance Costs
  • Wiring Access - 2 Conduit Entrances
  • Competitive Price Makes Monitor Your Best Value
  • 3 Bearing Design with Sealed Bearings Last Longer
  • Built-In Slip Clutch Extends Life
  • Hazardous Location Approvals Available
  • Unique Low-Voltage DC Design Available
  • Standard Units Rated to 300ºF (149ºC)
  • Hi-Temp Models Rated to 750ºF (399ºC)
Monitor's line of rotary paddle bin monitors consists of the most reliable, rugged and economical point-level control sensors available for detection of dry bulk materials. These easy to install units are proven performers in a wide variety of bulk materials. Monitor's paddle units can be used to eliminate bin overflow, maintain a pre-determined material level, indicate plugging of conveyors and pneumatic lines or provide a number of level control functions. Unlike many other available paddle units, Monitor's paddle level indicators incorporate a feature that automatically shuts off the motor of the unit when the paddle is in a stalled position, which both extends the life of the motor and minimizes maintenance.
Unit of Measure


Model Type


Operating Voltage

N/A 12/24 VDC

Mounting Connection

N/A 1 1/2 BSPT

Circuit Configurations / Process Connection

N/A 2 circuits (2 SPDT) / 1 1/2 BSPT



Temperature Style

N/A None

Max. Power Consumption

N/A 4 W

External Ambient Operating Temperature

N/A -57° to 200 ºF-49° to 93 ºC

Internal Bin Operating Temperature

N/A up to +300 ºFup to +149 ºC

Output Contacts

N/A Two SPDT 15A at 250 VAC Max.

Max. Pressure

N/A 30 psi2 bar


N/A Die Cast Aluminum IP66 NEMA 4 / Enclousure Type 4

Housing Finish

N/A Powder Coating

Conduit Connections

N/A Two (2) 3/4 NPT; M20 cable glands (Model KA units with 1 -1/2 BSPT process connection only; Not on KAX units)



N/A 8 1/2 lb3.9 kg

Principle of Operation

N/A The operation of Monitor's paddle level control products is quite simple. The unit is installed through the wall of the ves sel, so that the paddle protrudes inside the vessel. A small electric motor drives a paddle which rotates freely in the absence of material.

When the paddle is impeded by material, the motor rotates within the housing which triggers two switches. The first switch is a "dry" electrical contact closure that is available to control a process function or alarm circuit. The second switch cuts the power to the motor, preventing a locked rotor condition, thus extending motor life. This also activates the signaling device which is wired through that same motor switch. When the material level drops, the loaded stretched tension spring returns the motor to its original running posi tion and the unit is reactivated.


N/A Monitor's rugged, reliable design make the paddle units compatible with many granular, pelletized and powder bulk applications. Monitor paddle units can be used for high level indication of materials over 10 lb/ft3 (160 kg/m3) and for low and intermediate level indication for materials over 5 lb/ft3 (80 kg/m3). Monitor paddle units can be installed almost anywhere dry bulk materials are stored, including bins, hop pers, silos and tanks. Monitor's KA unit is the most popular of our paddle bin monitors. This model is ideal for use in standard applications with a wide variety of materials. The KAX incorporates all the features of the KA model, but is specially designed to meet explosion-proof standards.

  • Feed
  • Rocks
  • Wood
  • Rubber
  • Regrind
  • Peanuts
  • Clays
  • Limestone
  • Foundry Sand
  • Rawhide
  • Silica Sand
  • Pellets
  • Calcium Dust
  • Metals
  • Coal
  • Malt
  • Resin
  • Grain
  • Pre-Mix Ingredients
  • Sawdust



  • Complete motor shut-off prevents motor burnout and extends the life of the unit
  • Twist on/off cover means no bolts to hold or lose - Hassle- free housing design
  • UL, CSA and ATEX/IECex hazardous location approvals (KAX)
  • 1 -1/4" NPT or 1 -1/2" BSPT process connection
  • Two conduit connections provide easy wiring access (M20 cable glands provided with Model KA units with BSPT process connection)
  • Built-in slip clutch protects motor and drive gears from excessive rotational forces
  • Three bearing design with sealed bearings fully minimizes drive shaft loads and drag providing extended life
  • Interchangeable paddle assemblies increase the paddle unit's versatility
  • Built-in signal delay prevents false signaling
  • Field adjustable sensitivity
  • High operating temperature up to 300°F (149°C) (Hi-temp version up to 750°F (399°C))

Available Models

N/A Monitor's KAunit is the most popular of our paddle bin monitors. This model is ideal for use in standard applications with a wide variety of materials. The KAX incorporates all the fea tures of the KA model, but is specially designed to meet hazardous location standards.

Available Configurations

Monitor offers several motor voltages to serve most power requirements. Available AC motors include 115 VAC, 230 VAC, 24 VAC and 48 VAC. Superior 12/24VDC design avail able uses low voltage AC motor for longer life in all applications.

Monitor paddle units are available with 1, 2 or 3 output con tacts. The cost effective 1 -circuit model utilizes the motor switch (SPDT) as the output contact, as long as the alarm device operates on the same voltage as the motor. The most popular 2-circuit design contains the motor SPDT switch and a second SPDT isolated switch for control outputs (See "Wiring Diagram"). The 3-circuit configuration provides the user with the SPDT motor switch and an isolated DPDT switch for control outputs.

Monitor offers a choice of either a 1 -1/4" NPT or 1 -1/2" BSPT process connection. Model KA units with the 1-1/2" BSPT connection also include M20 cable glands.

Monitor paddle units are available approved to UL, CSA and ATEX/IECex requirements. Various models are approved for either general purpose, dust/ignition-proof and/or explosion-proof applications. In addition, all models carry the CE mark. See "Specifications" section for more details.

Monitor's high temperature models incorporate all the standard features of the KA or KAX models, but can be used in applications where temperatures reach as high as 750°F (399°C). The hi-temp models incorporate a specially designed mounting plate, pipe extension with air purge connection, shaft extension, couplings and bushings.The high-temp assembly is available in either a carbon steel or stainless steel version. See "Ordering Information" for applicable part numbers.

Materials of Construction / Accessories

N/A All Paddles except Ex-Flex: 304 Stainless Steel Ex-Flex Belt: 304 Stainless Steel Coupling, Rubber / Fabric Blend Belt Flexible Cable Extension: 304 Stainless Steel Flexible Coupling: 304 Stainless Steel Mounting Plates: Carbon Steel or 304 Stainless Steel Shaft Seal: Nitrile Solid Shaft Extension / Guards: Galvanized or 304 Stainless Steel


N/A Monitor Technologies LLC warrants each rotary paddle bin indicator it manufactures to be free from defects in material and work manship under normal use and service within two (2) years from the date of purchase. The purchaser must give notice of any defect to Monitor 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.

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