Economical Rotary Paddle Level Control, Top or Side Mounting for Dry Bulk Materials

Incorporated in the design of the PLS is a magnetic drive that is time proven by decades of use in our Mark Series valve position indicator product line. A 1 rpm synchronous motor rotates the paddle, utilizing a magnetic drive. As product builds up, the paddle is impeded from moving and the resulting motor torque activates the output switches and stops the motor. A spring mechanism reactivates the motor and returns the switches to normal state when the product no longer impedes the paddle rotation.

Standard construction is weatherproof with explosion-proof optional, and the unit can be side or top mounted. The PLS is designed with the industry standard 1-1/4" male NPT connection and mounting flanges.

Product Applications

Mining
Food and beverage
Silos
Hoppers

More Information

Model Chart

EXAMPLE	PLS	W	S	1	1	CSF	GS	GS	012	FC	Series PLS-W-S-1-1-CSF-GS-GS-012-FC Paddle Level Switch, weatherproof enclosure, SPDT, 110-120 VAC, low density paddle, carbon steel with full coupling, 12" 1/4 NPS galvanized steel shaft extension and protective shield, with flexible coupling.
SERIES	PLS										Paddle Level Switch
ENCLOSURE DESIGN		W E WH EH									Weatherproof Explosion-proof Weatherproof High Temperature Explosion-proof High Temperature
SWITCH TYPE			S D TD1 TD2								SPDT DPDT (dual SPDT switches) DPDT Time Delay, 120 VAC SPDT Time Delay, 230 VAC
POWER SUPPLY				1 2 3 4 5 6 7							110-120 VAC 230 VAC 24 VAC 48 VAC 12 VDC 24 VDC 230 VAC with CE approval (Not valid with E, EH, TD1, TD2)
PADDLE					0 1 2 3 4						No Paddle Low Density Paddle (PDL-1) Medium Density Paddle (PDL-2) Banana Paddle (PDL-3) High Density Paddle (PDL-4)
FLANGE						0 CSH CSF SSH SSF					No Mounting Flange Carbon Steel with Half Coupling (FLG-CSH) Carbon Steel with Full Coupling (FLG-CSF) 316SS with Half Coupling (FLG-SSH) 316SS with Full Coupling (FLG-SSF)
SHAFT EXTENSION MATERIAL							0 GS SS				None 1/4 NPS Galvanized Steel 1/4 NPS 316SS
PROTECTIVE SHIELD MATERIAL								0 GS SS			None 1/4 NPS Galvanized Steel 1/4 NPS 316SS
SHAFT EXTENSION AND SHIELD LENGTH									006 012 018 024 030 036 042 048		None 6 Inch 12 Inch 18 Inch 24 Inch 30 Inch 36 Inch 42 Inch 48 Inch
OPTIONS										FC NL RL SS	Flexible Coupling (CPL-FLX) No Indicator Lights Reversed Light - Light Indication when Paddle Freely Rotates 316SS Housing, Cover, Mounting Boss

Options

Contact the factory for pricing of shaft extensions, protective shields, and other options. More detailed information available in our Measurement & Control for Powder, Dust, and Bulk Materials Catalog.

Specifications

Service: Dry powder or bulk materials compatible with wetted materials.
Sensitivity: Minimum material density of 5 lb/ft³ (80 kg/m³), maximum of 200 lb/ft³ (3200 kg/m³).
Wetted Materials: Paddles: 316 SS. Exposed Shaft: 316 SS. Shaft Seal: PTFE. Mounting Boss: Aluminum. Flexible Coupling: 316 SS. Mounting Flanges: Carbon Steel or 316 SS. Shaft Extension and Shaft Guards: Galvanized Steel or 316 SS.
Temperature Limits: Standard Construction: Process: -40 to 300°F (-40 to 148.9°C), Ambient: -40 to 185°F (-40 to 85°C); High Temperature: Process: -40 to 500°F (-40 to 260°C), Ambient: -40 to 185°F (-40 to 85°C).
Pressure Limit: 30 psig (2.07 bar) maximum for .5 micron or larger material.
Power Requirement: Select by part number: 110-120 VAC, 230 VAC, 24 VAC, 48 VAC, or 12 VDC.
Power Consumption: Weatherproof models: 5 watts, Explosion-proof models: 3 watts.
Enclosure: Aluminum, powder coated.
Enclosure Rating: Weatherproof (W, WH construction): NEMA 4X, Explosion-proof (E, EH construction): NEMA 4X and rated for Class I, Div. 1 & 2, Groups C & D, Div. 1 & 2, Groups E, F, & G.
Switch Type: SPDT or optional DPDT snap switch.
Electrical Rating: 15 A @ 120/230 VAC, 5 A @ 24 VDC.
Electric Connections: Screw terminals.
Conduit Connection: 3/4" female NPT.
Process Connection: 1-1/4" male NPT. Optional flange.
Indication Light: Red LED that activates when switch is made or when switch is not made with RL option (not available on Explosion-proof models).
Time Delay Relay Option: Five field adjustable ranges from 0-1 to 0-31 minutes. (RL option not available, DPDT option not available with 230 VAC time delay).
Weight: Control head only: 4 lb (1.81 kg).
Agency Approvals: cUL, UL approved as an auxiliary device or as an auxiliary device for hazardous locations.

Features

Magnetic drive that isolates and completely seals the control head from the process and environment preventing material or dust from entering the control head.
Motor shuts-off when paddle stalls increasing motor life, preventing motor burnout, and decreasing power usage.
Slip clutch design enabled by the magnetic drive that prevents damage to motor and drive mechanism from sudden or excessive loading on the paddle.
Status indication light on weatherproof models.
Screw cover on the enclosure for easy access with no worries about losing bolts or screws.
Modular design to allow field installation of any paddle, flanges, shaft extensions, or shaft guards.
Flexible coupling available for protection of the paddle and drive from side loads, surges or impacts. Recommended for top mount applications with shaft extension and applications with large or heavy materials.

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Series PLS Paddle Level Switch

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