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Siemens QFM 2160 Failure

05/17/2017 3:52 AM

Dear All,

In my plant we are using Siemens QFM 2160 for measuring temperature and humidity of the air which is supplied to the tunnel to moisture the dry wafer sheet to get proper moisture as per standard.

Recently this sensor failed and it caused breakdown now as a part of doing failure analysis I would like to know anyone faced similar issues with this senor and what may be the causes for the failure? it is located at the outlet of the steam generator which is moisturizing the air.

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#1

Re: Siemens QFM 2160 failure

05/17/2017 4:30 AM

It would be good to know what sort of "failure" you experienced.

Did it catch fire? Is plain dead and does not work at all? Is it giving wrong signals?

What did Siemens say?

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#2
In reply to #1

Re: Siemens QFM 2160 failure

05/17/2017 8:03 AM

It is not giving output signal, so I want to know how I can test that its problem related to electronics which convert 4-10 ma output or sensing element?

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#4
In reply to #2

Re: Siemens QFM 2160 failure

05/17/2017 8:42 AM

Easy. Pass it to the manufacturer, and ask for a report.

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#9
In reply to #2

Re: Siemens QFM 2160 failure

05/17/2017 8:32 PM

You mean 0-10 vdc output signal....Your sensor(s) may have failed, they may have suffered an impact.... I would also check the power supply to make sure it is within the stated spec....

https://www.downloads.siemens.com/download-center/Download.aspx?pos=download&fct=getasset&id1=24897

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#3

Re: Siemens QFM 2160 failure

05/17/2017 8:41 AM

Given that this sensor has caused a breakdown, the priority has to be getting the strategic spare out of the stores, installing it, and getting the process up and running again.

Remember either to get the repaired one back in the store, or to re-order it, so that a replacement strategic spare is always to hand.

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#5

Re: Siemens QFM 2160 Failure

05/17/2017 10:20 AM

Such a lousy instrumentation to interrupt a vital process. This sensor can be done with 2 thermocouples in which one thermocouple is wet by some sort of wick and a computer for the measurement and conversion process. You could even do it in an ardiuno processor.

Hire some smart instrumentation guy.

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#6
In reply to #5

Re: Siemens QFM 2160 Failure

05/17/2017 10:37 AM

That is just a really sorry answer to his problem, and not good engineering.

Thermocouples are for high temperatures, not moderate or low temperatures.

I suspect they installed this sensor to near the steam outlet, and it became colder than the surroundings somehow, and this resulted in condensation within the instrument or the transmitter housing, which killed the output.

A full audit of the instrument installation must be made to ensure that the transmitter itself is not in an environment that is outside the specification. The sensor should be able to withstand the environment of a humidifying tunnel, but should not be allowed to encounter conditions that might lead to condensation within the sensor itself.

Having spares on hand is mandatory for process critical items. Also, the output should be 4-20 mA, not 4-10 mA as stated by OP.

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#7

Re: Siemens QFM 2160 Failure

05/17/2017 11:40 AM

The one we use to correct for ultrasonic velocity in air. Connected to an Arduino it has never failed.

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#8
In reply to #7

Re: Siemens QFM 2160 Failure

05/17/2017 12:11 PM

Is that used in a wind tunnel or such?

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#10
In reply to #8

Re: Siemens QFM 2160 Failure

05/18/2017 12:21 PM

ARPI (Autonomous Robotic Pipe Inspection)

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#12
In reply to #10

Re: Siemens QFM 2160 Failure

05/18/2017 1:10 PM

Cool!

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#11

Re: Siemens QFM 2160 Failure

05/18/2017 12:41 PM

Not that this answers your question, as James Stewart mentions water on the probe will make it read incorrectly, but not normally fatal failure.

Rotronic makes a Hygroflex7 that is derived from industry workhorses I'm familiar with for at least 15 years in high temp, vibration, dirty, poor power quality, condensing atmospheres, and never a failure noted, maybe 7-8 years of cumulative observed hours in various installations...

https://www.rotronic.com/en-us/humidity-measurement-feuchtemessung-temperaturmessung/humidity-measurement-feuchte-messung/humidity-transmitters-messumformer/hygroflex-humidity-transmitter/hygroflex7-hf7.html,

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#13

Re: Siemens QFM 2160 Failure

05/26/2017 1:12 PM

Thank you all for the support,

Actually we found that instrument is installed wrongly by machine supplier. (it should be at least 3 meter away from steam humidifier, but supplier installed within 1 meter) so we modified the installation place now. regarding instrument spare, we have it in our technical store, but replacement will take some time and as per our company policy anything above 10 minutes technical failure is consider as breakdown.

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