Pepperl+Fuchs Blog

Ask an Expert Industrial Sensors: Episode 15

Posted by John Appleson on Thu, Jan 28, 2016

This episode of Ask an Expert for industrial sensors examines and provides answers to interesting sensing questions we've received from customers just like you. We explore and answer these questions:

1. What does the LED message 'bad' mean on my WCS-IP 111 interface module?
2. Does the 973EX4WI-A10T inductive sensor require an intrinsic safety barrier or circuit?
3. How can you test the SJ10-N inductive slot sensor?
4. The RC10-14-NO inductive ring sensor is used in a rivet gun, but can give a false count at times. How to correct this?


Feel free to ask us your sensing questions, and we'll do our best to reply with the whys and hows of a particular solution.




John: Welcome to Ask an Expert! Hi, this is John Appleson, Marketing Manager with Pepperl+Fuchs. Today, I'm joined by Casey Sutton. Casey works as an Application Engineer here at Pepperl+Fuchs. So welcome, Casey and thanks for being here!

Casey: Hi John, thanks for asking me.

John: OK, Casey, let's get started. The first question asks about a WCS-IP 111 interface module that is attached to a WCS-LS211-H linear encoder. The display on the interface reads 'bad' occasionally. What exactly does this mean, and where can additional technical information be found?

Casey: This error is associated with the WCS linear encoder module itself. It occurs when dirt or dust builds up and the read head can't get a good read. This can be resolved simply by cleaning the lens of the read head. Technical information on both of these products can be found on our website.

John: OK, a customer asks if our 973EX4WI-A10T inductive sensor requires an intrinsic safety barrier or circuit?

Casey: If the application requires a Class I, Div. 1 specification, then yes, this inductive sensor needs to be combined with one of our intrinsically safe barriers. If not, then the sensor can be used on its own.

John: The next question asks how to test the SJ10-N inductive slot sensor. The customer would like to know if it requires an input voltage, and if there is a circuit board involved?

Casey: While a circuit board is not needed, there does need to be a nominal input voltage of 8.2 volts DC. One way to test the sensor is to hook up an ammeter in series with the sensor and watch for the current change when a target is detected, vs. when a target is not detected.

John: In this next application, the customer is using an RC10-14-NO inductive ring sensor inside a rivet gun, to detect steel mandrels passing through. He uses the signal to count the pieces. If a wire breaks inside the cable, the sensor gives a false count. The customer would like to know if we offer a sensor of the same size and shape that will not send a signal if the wire is shorted out. The sensor is used with a relay controller as well. Casey, can we offer this customer a solution for his problem?

Casey: This sensor is normally closed, so when the wire breaks, it is seen as a switch opening. In this specific style and size of sensor, normally closed is the only option. Unless the customer changes the configuration completely, they need to try and avoid breaking the wire as much as possible.

John: Well, that concludes this segment of Ask an Expert. I'd like to thank Casey for joining me today, and thank our audience as well.

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Topics: Inductive Sensors, Ask an Expert, Positioning Systems

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