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Jim ODay
Joined: 09 Jul 2007
Posts: 61
Location: Fargo North Dakota
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 Posted: Sat May 17, 2008 9:30 am Post subject: How to bench test EGT and CHT sender units |
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477 Rotax
How do I test an EGT and CHT sender w/o running the engine? Before I wreck something I thought I should inquire. I could not find and help using the search.
Thanks.
Jim
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Jim O'Day
Fargo, ND
Former Firestar II Builder/Pilot |
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Roger Lee
Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.
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| Posted: Sun May 18, 2008 7:35 am Post subject: Re: How to bench test EGT and CHT sender units |
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Hi Jim,
You can call the probe mfg and get the specs and use a meter on them or put them in a known hot area (like boiling water at 212F) and check your gage or check them against another known good probe/gage.
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Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056 |
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h&jeuropa
Joined: 07 Nov 2006
Posts: 645
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| Posted: Mon May 19, 2008 4:19 am Post subject: Re: How to bench test EGT and CHT sender units |
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Jim,
The data for resistance versus temperature is available at
www.sso-usa.com
You'll have to look thru the website to find it. You will also find a chart that lists the number stamped on the sensor and gives the part number, its temp range and threads.
912 & 914 come with VDO 300 deg sensors.
300 deg sensors vary from 322 to 18 ohms. 120 deg F is 322 ohms. 200 deg F is 76 ohms and 220 deg is is 57 ohms. Measure what the resistance is at room temp - should be 322 or more. Put the sensor in boiling water - should be between 57 & 76, close to 65 ohms.
Jim Butcher
Europa N241BW
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Thom Riddle
Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)
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| Posted: Tue May 20, 2008 3:02 am Post subject: Re: How to bench test EGT and CHT sender units |
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Temperature sensor resistance graphs are also in the Rotax 912 Heavy Maintenance Manual.
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Thom Riddle
Buffalo, NY (9G0)
Don't worry about old age... it doesn't last very long.
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