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Broken or Slack Chain Detection

By using a WDA sensor in combination with a speed relay, ferrous steel flights or bolts on plastic paddles are used to monitor for broken or slack chain issues on drag conveyors.

The WDA is a non-contacting extended range magnetic proximity sensor, not affected by dust or material build up, used to detect moving ferrous material up to 3 inches away from the sensor. The speed relay is used to monitor the speed of a rotating shaft and detect if it rises or falls below a preset safety level.

This simple solution can help to prevent equipment damage and downtime costs.

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	WDA Sensor Technical Specifications:		Literature:
	• Part Number - WDA3V34C		• Product Brief
	• Voltage - 12 to 24 VCD ±10%		(See Downloads for more literature)
	• Supply Current - 65 mA
	• LED Indicator - Green (Flashing), Target Detected		Technical:
	• Outputs (Max) - 100 mA Sink (Pull) / 50 mA Source (Push)		• WDA Sensor Manual
	• Detection Range - Adjustable 1 to 3 inches (25 mm - 76 mm)		• Speed Relay Manual
	• Detection Rate - 20 to 2,000 Targets/Minute
	• Cable - 6 Conductor (9 ft.)		Product Dimensions:
	• Conduit Entry - 1/2 in. NPT		WDA Sensor -
	• Temperature Rating -4°F to 122°F (-20°C to 50°C)		• .dwg (AutoCAD) .pdf
	• Protection - IP66
			Speed Relay -
	Approvals:		• .dwg (AutoCAD) .pdf
	• CSA Class II Div 1 Groups E, F & G (USA & Canada)
	• ATEX, CE & IECEx Versions Available (Europe)






	Speed Relay Technical Specifications:
	• Power Supply - 110 / 240 VAC
	• Mounting - DIN 35 x 7.5 mm Rail
	• Protection - IP50






	Part Numbers and Accessories:
	• WDA3V34C ~ WDA Sensor
	• HTAS1V34 ~ WDA Sensor (High Temperature Version)
	• SR2V5-1 ~ Speed Relay


	The WDA sensor will not calibrate, what is the issue?
	Make sure that the yellow/orange wire is connected to the red wire, this powers the potentiometer (calibration screw).

	Why will the LED on the back of the sensor not turn on?
	Check to see that there are no objects stuck to the face of the sensor (washer, bolts, etc.). Due to the magnetic pull
	on the face of the sensor, objects can stick and interfere with the sensor.

	What if the best sensing depth of the WDA sensor?
	The WDA sensor can detect ferrous targets from 1 to 3 inches away. Keep in mind the distance of other objects within
	the sensing area. For example, a belt splice on a bucket elevator may be longer than the intended target and can
	interfere or hit the WDA sensor.