I am currently experiencing stability problems when setting up two PT-104 converters.
I have one converter connected to my PC via a USB converter lead which has four 4-wire PT100 sensors connected to it. The second converter is connected to the PC via the serial port and has two 4-wire PT100 sensors connected to it.
These units are immersed in three oil baths (2 probes per bath) at a temperature of 160Â°C.
I am experiencing wildly fluctuating temperatures on the channel 3 probe connected to the USB PT104, and also on both probes on the Serial PT-104. However when i remove any of these PT100's from the oil bath and manually hold the PT100 in the bath (ie not touching any part of the bath itself) the readings stabilise at 160Â°C.
The PT100's were supplied with the PT-104 converters from Picotech.
I suspect this may be a PT100 wiring or grounding problem as i can swap the faulty PT100 probes into other ports and the fault occurs no matter which port the probe is connected to
Thanks for you assistance