Author Topic: Where is the ambient temperature sensor on a Proliant DL380p G8?  (Read 5029 times)

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Offline NiHaoMikeTopic starter

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Where is the ambient temperature sensor on a Proliant DL380p G8?
« on: February 08, 2024, 01:51:21 am »
I scored a nice deal on a HP Proliant DL380p G8 (since I have 192GB of DDR3 LRDIMMs to use, otherwise I would have picked something newer even though $68 is hard to beat), it works well but the ambient temperature sensor reads about 20F less than the actual ambient temperature. Where is that sensor located so I can try to fix it? It's the version with 25 2.5" drive slots if that makes a difference.
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Offline Halcyon

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Re: Where is the ambient temperature sensor on a Proliant DL380p G8?
« Reply #1 on: February 08, 2024, 01:55:43 am »
Typically they are mounted on the motherboard themselves.
 

Online Haenk

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Re: Where is the ambient temperature sensor on a Proliant DL380p G8?
« Reply #2 on: February 09, 2024, 04:02:04 pm »
I have a couple of ML350s, these come with the "Sea of sensors" - I assume this is the same on this machine. So there will be quite a few temperature sensors in there.
 

Online PA0PBZ

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Re: Where is the ambient temperature sensor on a Proliant DL380p G8?
« Reply #3 on: February 09, 2024, 04:34:53 pm »
If it is the ambient sensor it should be located at a fan inlet.
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Offline DavidKo

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Re: Where is the ambient temperature sensor on a Proliant DL380p G8?
« Reply #4 on: March 14, 2024, 12:15:40 pm »
If you need to know it roughly, than look to iLO, you can look to the map of the temperatures. It need to be in front of the disks or very close to the front, since the air intake is there and the sensor should not measure the temperature behind the disks.
 

Offline cncjerry

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Re: Where is the ambient temperature sensor on a Proliant DL380p G8?
« Reply #5 on: May 27, 2024, 03:37:14 am »
the sea of sensors on DL380s turns into a pain.  I had my fan sensor go bad, not the fans, the sensor.  That was the end of that one.  I then bought another G8 and that one decided whenever it wanted to just shutdown with no error logged. I switched to Dell but you cant mix the memory on Dell vs the DL380.  The nice thing about the DL380s is that you can pull out the front cage and make a standalone SAS drive bay.  You can make up a power cable for it pretty easily.

Good luck finding that sensor. 
 

Offline pqass

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Re: Where is the ambient temperature sensor on a Proliant DL380p G8?
« Reply #6 on: May 27, 2024, 05:10:46 am »
Google-ing proliant dl380p gen8 temperature sensor returns part number 460423-001.
See attached for what looks like a TO-92 part at the end of a two-conductor pig-tail. 
Could it be a diode-connected transistor?    Zooming in..... yup "KN3904".

You'd think they'd use a factory calibrated sensor like an LM35.  Given that it's a field replaceable part and no two transistors are alike, there should be a calibration process.   That is, you can count on the slope (-2.2mV/°C) but not the starting point.
« Last Edit: May 27, 2024, 05:32:30 am by pqass »
 

Offline amyk

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Re: Where is the ambient temperature sensor on a Proliant DL380p G8?
« Reply #7 on: May 28, 2024, 02:52:40 am »
A heat gun or freeze spray may help finding it ;)
 


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