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Brass Rub Blocks
Belt Misalignment Sensors

Brass rub blocks monitor for belt misalignment problems on bucket elevators and conveyors by detecting heat generated by the friction of the misaligning belt rubbing against the brass.

A temperature sensor within the brass block provides the temperature reading and the system generates an alarm and a shutdown when a trip point is reached.

The sensors are usually installed in pairs on opposite sides of the machine to detect misalignment on either side. Sensors can be connected directly to a PLC input, or for greater safety, to a central independent monitoring system such as 4B’s T500 Elite Hotbus™, Watchdog™ Super Elite or T400N Elite Hotswitch.

Inspection doors are available to assist with periodic maintenance and testing of the brass rub block and system.

Features:

Brass Rub Block Belt Misalignment Sensor

• Belt Misalignment Monitoring

• Easy Installation

• No Moving Parts (Solid Brass Block)

• Temperature Activated (Friction)

• External Sensor Testing (ADB Tester)

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Accessories
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	ADB Temperature Sensor Specifications (NTC Type):		Literature:
	• Resistance at 77° F - 10,000 Ohms		• Product Datasheet
	• Resistance at 140° F - 3,043 Ohms
	• Resistance at 194° F - 1,264 Ohms		Technical:
	• Sensing Voltage - 5 to 24 VDC		• 4 x 2 Inspection Door Manual
	• Current Draw - 1 mA
	• Maximum Power - 120 mW at 77° F (25° C)		Dimensions:
	• Body Housing - 304 Stainless Steel		• 2 x 4 Rub Block (RB2W4LR2)
	• Fixing Thread - 1/8" NPT		.dwg (AutoCAD) .pdf
	• Cable - 9 ft. (3 m) - 2 Conductor
	• Operating Temperature -22° F (-30° C) to 220° F (105° C)		• 2 x 4 Inspection Door (RBID3X9)
			.dwg (AutoCAD) .pdf
	ADB Temperature Sensor Specifications (PT100/RTD Type):
	• Resistance at 77° F - 109.73 Ohms		• 2" Round Rub Block (RB2D)
	• Resistance at 140° F - 123.24 Ohms		.dwg (AutoCAD) .pdf
	• Resistance at 194° F - 134.70 Ohms
	• Temperature Coefficient - 3850 PPM/K (385)		• 2" Round Mounting Plate (RBP1)
	• Sensing Voltage - 5 to 24 VDC		.dwg (AutoCAD) .pdf
	• Current Draw - 1 mA
	• Maximum Power - 1 mW
	• Body Housing - 304 Stainless Steel
	• Fixing Thread - 1/8" NPT
	• Cable - 9 ft. (3 m) - 4 Conductor
	• Operating Temperature -22° F (-30° C) to 220° F (105° C)

	ADB Temperature Sensor Approvals:
	• CSA Class II Div 1 Groups E, F & G (USA & Canada)
	• ATEX Versions Available





	Part Numbers and Accessories:
	• RB2W4LR2 ~ 4 x 2 Brass Block
	• RBID3X9 ~ 4 x 2 Rub Block Inspection Door
	• KIT-RUB-7 ~ 4 x 2 Brass Block & Inspection Door (Set)
	• RBH1 ~ 2 in. Round Brass Block
	• RBP1 ~ 2 in. Round Mounting Plate
	• RB2D ~ 2 in. Brass Block & Mounting Plate (Set)
	• ADB20V3C/D3 ~ ADB Temperature Sensor - NTC Type
	• ADB29V3C/D2 ~ ADB Temperature Sensor - PT100/RTD Type
	• ADBW ~ ADB Sensor Probe Wrench
	• ADBT4 ~ ADB Sensor Tester
	• WDC4V46C ~ Watchdog Super Elite (Monitoring Control Unit)
	• T5004V46C ~ T500 Elite Hotbus (Monitoring Control Unit)
	• T400N4NV46C ~ T400 Elite Hotswitch (Monitoring Control Unit)


	Literature:		Dimensions:
	• Product Datasheet		• 2 x 4 Rub Block (RB2W4LR2)
			.dwg (AutoCAD) .pdf
	Technical:
	• 4 x 2 Inspection Door Manual		• 2 x 4 Inspection Door (RBID3X9)
			.dwg (AutoCAD) .pdf
	Note: Product manuals for older part numbers can be
	found under the Technical Support area.		• 2" Round Rub Block (RB2D)
			.dwg (AutoCAD) .pdf

			• 2" Round Mounting Plate (RBP1)
			.dwg (AutoCAD) .pdf


			Inspection Door (RBID3X9) The rub block inspection door simplifies the installation process of 4 x 2 rectangular brass rub blocks. During routine maintenance inspections, the hinged design allows for easy access to inspect both the belt and the rub block for wear.









			Mounting Plate (RBP1) Designed for installing 2" round brass rub blocks. The plate mounts directly to the casing of the machine.









			ADB Temperature Sensors The sensor probes are adjustable for more accurate temperature readings. Available sensor types: NTC or PT100/RTD. More Info








			ADB Sensor Tester The ADB Sensor Tester has been designed to test 4B adjustable depth bearing (ADB) temperature sensors in the field. During planned maintenance or periodic testing, this diagnostic tool to verify the alarm and shutdown sequences of the control unit are functioning as expected. More Info


			Watchdog™ Super Elite Hazard Monitor The Watchdog™ Super Elite processes signals from sensors for belt misalignment, belt speed & slip, continuous bearing temperature, pulley misalignment and plug conditions for bucket elevators or belt conveyors. More Info









			T500 Elite Hotbus™ Hazard Monitor The T500 Elite Hotbus is a serial communications system designed to monitor up to 256 sensors on multiple bucket elevators and conveyors for belt speed, belt alignment, bearing temperature, level and plugged conditions. More Info









			T400N Elite Hotswitch The T400N Elite Hotswitch is a microprocessor controlled temperature monitor, which works in conjunction with NTC type temperature sensors. The unit can provide an alarm and automatic shutdown, on up to 2 machines, when a hot temperature condition is detected. More Info


	What is the difference between the Touchswitch sensor and a rub block?
	The Touchswitch is a pressure sensitive contact switch. When the belt misaligns and contacts (touches) the
	sensor with enough force, an alarm is triggered.

	Rub blocks are designed to detect the heat generated by friction when the belt rubs against the brass block.

	Touchswitches provide an immediate alarm, while brass rub blocks can take longer to activate due to the time it takes
	for enough heat to build up to trigger an alarm.









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Material Handling

Electronics

Brass Rub Blocks
Belt Misalignment Sensors

Brass rub blocks monitor for belt misalignment problems on bucket elevators and conveyors by detecting heat generated by the friction of the misaligning belt rubbing against the brass.

Features:

• Belt Misalignment Monitoring

• Easy Installation

• No Moving Parts (Solid Brass Block)

• Temperature Activated (Friction)

• External Sensor Testing (ADB Tester)

Material Handling

Electronics

Brass Rub Blocks Belt Misalignment Sensors

Brass rub blocks monitor for belt misalignment problems on bucket elevators and conveyors by detecting heat generated by the friction of the misaligning belt rubbing against the brass.

Features:

• Belt Misalignment Monitoring

• Easy Installation

• No Moving Parts (Solid Brass Block)

• Temperature Activated (Friction)

• External Sensor Testing (ADB Tester)

Brass Rub Blocks
Belt Misalignment Sensors