ThermoHID Device Accuracy Check
I have access to some environmental test chambers so I decided to check the devices (TEMPer1, TEMPer, TEMPerHUM, TEMPer2 and TEMPerNTC)
against a calibrated thermometer.
**NEW** Added device TEMPerV1.2
At each of the temperatures in the graph below the devices were stabilized for about 15 to 20 minutes in the chamber.
ThermoHID was then used to read the devices. The actual temperature as measured by a calibrated thermometer was then noted.
The graph below shows the variation of the devices from the calibrated temperature at the designated measuring temperatures
of -40°C (-40°F), 0°C (32°F), +19°C (66°F), +50°C (122°F) and +90°C (194°F)
Each TEMPer1 device was colour coded for ease of reference.
I have not attempted to measure the hysteresis of the devices in this experiment. Nor have I tried to measure the
apparent 'stickiness' to certain temperatures that some of the devices seem to exhibit.
If the temperature is taken below -40°C (-40°F) then the device will read a really wild number.
I did not try to take the devices above +90°C (+194°F) as I was concerned about the material that the cable is made from
which does not seem too sturdy.
** NEW ** When measuring the TEMPerV1.2 devices I found them not to suffer from hysteresis. They do however,
exhibit 1->2 degrees of self warming. i.e. If the device is kept disconnected until it is stabilised.
Then it is plugged in to the computer and monitored, its temperature will rise 1 to 2 degrees over the next few minutes.
Please note that these values are for my devices and cannot neccessarily be applied to your devices.
However, they do give an indication as to the tendencies.