wander wrote:Or you could look at a cheap alternative from Jaycare.
http://search.jaycar.com.au/search?w=xc-0341&view=list
LandSailor wrote:I ended up getting a Coghlans Digital Dangler (what a name) just because it was small and compact.
Its a very simple device. The max/min function just retains the absolute max/min temperature since last reset.
If you dont reset it for a week you will get the max/min over the entire week.
So just need to remember to reset it each night before hitting the sack to get the overnight minimum.
Mark F wrote:Having used 20 mercury thermometers for a scientific study
Mark F wrote:How accurate this is? You need to be careful not to confuse the relative accuracy (difference between one reading and the next) and the accuracy against the temperature scale. Most electronic temperature devices are accurate to about 0.1 degree over their range but you need to standardise the unit against a known temperature source to know the offset - this is the +-2 degrees mentioned above (real temperature 10 deg, unit reads 11). Having used 20 mercury thermometers for a scientific study and had to calibrate them, they were all over the place - way over the 2 degrees difference. I am not fussed about the offset difference as a degree isn't important except for bragging (-7 at Whites River last Sunday morning).
Sounds reasonable enough.Precision wise - when it comes to accuracy of the Tempe device I've checked my product against a reference thermometer and it read within 0.3°C@0C/0.4°C@20°C
Mark F wrote:I have just been playing with a Garmin Tempe after I saw one at Valentines Hut over Easter.
Mark F wrote:The Tempe keeps recording even when the gps is off. It doesn't have a memory apart from the maximum and minimum so you cannot get a time series of temperatures for the period when the gps is off. When you turn on the gps then it gets the three values (current, max and min) from the Tempe every minute or so. If you left the gps on and set the Track log recording interval to time and set an appropriate time gap then the GPS should (I haven't tried it) act as a data logger.
Mark F wrote:The Tempe keeps recording even when the gps is off. It doesn't have a memory apart from the maximum and minimum so you cannot get a time series of temperatures for the period when the gps is off. When you turn on the gps then it gets the three values (current, max and min) from the Tempe every minute or so. If you left the gps on and set the Track log recording interval to time and set an appropriate time gap then the GPS should (I haven't tried it) act as a data logger.
Mark F wrote:My use of technical language is sadly lacking (forgotten) since my time at UTAS in the late 80's. Hopefully readers gleaned the ideas.
The Perambulator wrote:Could someone explain how to get an Etrex 30 to display the temperature in a data field? I have updated the software and connected the Tempe via ANT- but can't work out the next step.
Thanks Charlie
The Perambulator wrote:Could someone explain how to get an Etrex 30 to display the temperature in a data field? I have updated the software and connected the Tempe via ANT- but can't work out the next step.
Thanks Charlie
LandSailor wrote:I ended up getting a Coghlans Digital Dangler (what a name) just because it was small and compact.
Its a very simple device. The max/min function just retains the absolute max/min temperature since last reset.
If you dont reset it for a week you will get the max/min over the entire week.
So just need to remember to reset it each night before hitting the sack to get the overnight minimum.
LandSailor wrote:Bad news Im afraid. Yesterday I bought a food thermometer. I put the food thermometer and my Coghlans digital Dangler in the fridge overnight.
The Dangler showed an overnight minimum of 5 degrees whereas the food thermometer showed 3 degrees when I opened the fridge in the morning.
Based on a quick google, the standard fridge temperature should be approx 3 degrees or lower, so either my fridge and food thermometer are both incorrect or the coghlans digital dangler is a couple of degrees out. At room temperature the dangler and the food thermometer showed close to identical reading.
Make of that what you will, but looks like the digital dangler shows a significant loss of accuracy as the temperature decreases. Which of course, makes it totally useless for my intended purpose (record the overnight minimum).
Damn annoying! Might try the Garmin thingy as my next option.
I honestly don't think you can conclude anything from this. Thermometers are generally only accurate +-2C anyway.LandSailor wrote:Bad news Im afraid. Yesterday I bought a food thermometer. I put the food thermometer and my Coghlans digital Dangler in the fridge overnight.
The Dangler showed an overnight minimum of 5 degrees whereas the food thermometer showed 3 degrees when I opened the fridge in the morning.
Based on a quick google, the standard fridge temperature should be approx 3 degrees or lower, so either my fridge and food thermometer are both incorrect or the coghlans digital dangler is a couple of degrees out. At room temperature the dangler and the food thermometer showed close to identical reading.
Make of that what you will, but looks like the digital dangler shows a significant loss of accuracy as the temperature decreases. Which of course, makes it totally useless for my intended purpose (record the overnight minimum).
Damn annoying! Might try the Garmin thingy as my next option.
LandSailor wrote:Reading this rather dense article[/url] and without understanding all of it, it said that thermistors can be very accurate but only within a defined range. Once you move away from that range the accuracy decreases which seems a little like what happened for me.
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