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Problems I had with a SHT10 sensor - Printable Version

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Problems I had with a SHT10 sensor - tyntop - 25-01-2016

Hi,
I'd like to share some ideas. I had a problem with a SHT10 external temp/humidity sensor, after the adverse weather we've had here in the UK this sensor started showing readings of :
-40 temp
6550 humidity

I put this down to some moisture getting into the sensor, even though it was housed in an enclosure inside a Stevenson shield.
I downloaded a data sheet from Sensiron which implied that the SHT10 could/can be recalibrated, which I tried, the sensor was baked in an oven for several hours at 100c/ fan assisted, data sheet said 10 hours, it was then left out at room temperature near enough to the guide lines in the data sheet.

In the mean time I ordered items from farnell,

SF1 Item No 1390624 for SHT1x series sensors
SF2 Item No 1892485 for SHT2x series sensors

These are sensor filter caps which fit over the sensors and supposedly helps prevent ingress of moisture and other things.

SF1 come with 2 legs which allow for through PCB mounting, as my PCB didn't have these holes, the legs where care fully cut of and I used some clear silicon sealant being VERY CAREFULL not get any in/on the sensor itself, using this sealant not holds the cap in place but also seals it, ( Epoxy resin can also be used ) The sensor was rewired, rehoused and connected to the tx.

Readings gained where similar to the internal sensor so at least I was getting some near normal readings from it, The sensor is now back outside and seems to be working well, having compared its readings to other local weather stations on weather underground.

I would therefore suggest the use of these caps in other members
weather stations
Some pictures

RE: Problems I had with a SHT10 sensor - Shred - 25-01-2016

Great minds think alike: I have an SF1 filter cap sitting on my workbench, awaiting installation on my SHT11 next time I have the sensors down from the pole.

For Australian WeatherDuino builders, RS Components have them for $2.50 each (ex GST) and at present, offer free shipping. The part number is 667-5275.

http://au.rs-online.com/web/p/temperature-humidity-sensors/6675275/

I notice that Sensirion also advise putting a 100nF capacitor across the power supply pins of the SHT1x devices. I'm not sure if the break out boards that many of us have purchased from eBay include this. If not, it may offer a worthwhile improvement in accuracy and stability.

RE: Problems I had with a SHT10 sensor - GreggWardNZ - 02-06-2016

I have had problems with the SHT10 sensors that I bought on EBay. During the Summer, if the temperature exceeded 30C, the temperature being received at the RX unit was being reported as -40C. Now we are in the Winter, as soon as the temperature is going below 2C i.e 1.9C, I get the same problem. In both cases I end up having to wait until the temperature gets below 30C or 2C and above, reset the TX unit and Rx unit, to get it all working again.

I am wondering if the SHT10 sensor that I purchased is just a copy of the genuine one and does not have the same temperature operating range.

RE: Problems I had with a SHT10 sensor - werk_ag - 03-06-2016

Please check the solder joints between the sensor and the board where it is assembled. There are reports of units with problems in the welds.
Also check if you are powering the sensor with 5V.

RE: Problems I had with a SHT10 sensor - GreggWardNZ - 06-06-2016

(03-06-2016, 01:39)Werk_AG Wrote:  Please check the solder joints between the sensor and the board where it is assembled. There are reports of units with problems in the welds.
Also check if you are powering the sensor with 5V.

Thanks Werk_AG. I had also ordered an SHT15 with associated breakout board from SparkFun, to try as well.