Monitor - Model KA and KAX -Rotary Paddle Bin Level Indicators

• Point Level Sensor for Bins, Silos, Hoppers and Other Vessels Storing Bulk Solids
• Twist On/Off Cover - No More Bolts!
• Motor Shuts Off When Paddle is Impeded to Significantly Extend Motor Life and Reduce Maintenance Costs
• Wiring Access: 2 Conduit Entrances
• Competitive Price Makes The Monitor Bin Level Indicator Your Best Value
• Three Bearing Design With Sealed Bearings Last Longer
• Built-In Slip Clutch Extends Life
• Hazardous Location Approvals Available (Model KAX has ATEX/IECex haz loc approvals)
• Standard KA /KAX Units Rated to +300°F (+149°C)
• Hi-Temp Models Rated to +750°F (+399°C)
• Unique Low Voltage DC Design Available

The operation of Monitor`s rotary paddle bin level switch is quite simple. The unit is installed through the wall of the vessel, 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 position and the unit is reactivated.

Monitor’s rugged, reliable design make the paddle bin level indicator (sensor de nivel) compatible with many granular, pelletized and powder bulk applications. Monitor paddle switches 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, hoppers, 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.

Typical Applications include, but are not limited to:

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

• Complete motor shutoff 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))

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

OUTPUT CIRCUITS
Monitor paddle units are available with 1, 2 or 3 output contacts. 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 for illustration). The 3-circuit configuration provides the user with the SPDT motor switch and an isolated DPDT switch for control outputs.

PROCESS CONNECTIONS
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.

APPROVALS/LABELING
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.

HIGH TEMPERATURE UNITS
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.

Power Requirements:

• 115 VAC (+/- 10%), 50/60 Hz;
• 230 VAC (+/- 10%), 50/60 Hz;
• 24 VAC (+/- 10%), 48 VAC (+/- 10%), 50/60 Hz;
• 12/24 VDC (10.2-27.6 VDC)

Power Consumption:

• 4W max.
• Operating Temperature:
• -40°F (-40°C) to +200°F (+93°C) ext. amb.; to +300°F (+149°C) internal bin temperature. High Temp Unit to +750°F (+399°C) internal bin temperature

Conduit Connection:

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

Outputs Contacts:

• 2-Circuit Configuration: Two SPDT 15A @ 250 VAC ea. max
• 3-Circuit Configuration: One SPDT 15A @ 250 VAC max, One DPDT 10A @ 250 VAC max
• Maximum Pressure: 30 PSI (2 bar) maximum
• Sensitivity: 5 lb/ft³ (80 kg/m³) minimum material density (when using large 3-vane paddle)
• Housing: Die cast aluminum, NEMA 4 / ENCLOSURE TYPE 4, IP66
• Housing Finish: Powder coating
• Mounting Connection: 1-1/4" NPT or R 1-1/2 (BSPT 1-1/2)
• Shipping Weight: Approx. 7 lbs (3.2 kg)
• Materials of construction/accessories:
• Flexible Couplings: 304 stainless steel
• Mounting Plates: Carbon steel or 304 stainless steel
• 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
• Solid Shaft Extension/Guards: Galvanized or 304 stainless steel
• Shaft Seal: Nitrile
• Listings/Approvals:
• KA: UL and CSA: Ordinary Locations
• KAX:
• UL and CSA: Class I, Div. 1 & 2, Groups C, D;
• Class II, Div. 1 & 2, Groups E, F, G
• ATEX:
• (Ex) II 1/2 D c T 100°C
• ExtD A20/A21 T 100°C
• (Ta -40°C to +93°C)
• IP6x
• IEC Ex:
• DIP A21 IP6X TA 100°C
• -40°C to +93°C
• All Models: CE Mark