Configuring PT1000 sensors

Dougal1957

This is probably for David but please feel free to chip in if you can help.

I Have some PT1000 sensors from RS pn 100-7530 https://uk.rs-online.com/web/p/platinum-resistance-temperature-sensors/1007530/?sra=pstk and I have put one straight into a molex shell for test.

when out of the board it measures 1.1 kOhms so I would expect this to give me a sensible reading on DWC (Not the case)

I have it configured as M305 P0 X500 in my config

with nothing connected to the E0 Thermistor pins the DWC Reads 493.6 degrees with the pt1000 connected I get the same

This is the Heater section of my Config.g

; Heaters
M305 P0 X500 R4700 ; Configure thermocouple for heater 0
M143 H0 S120 ; Set temperature limit for heater 0 to 120C
M305 P1 X200 ; Configure thermocouple for heater 1
M143 H1 S280 ; Set temperature limit for heater 1 to 280C

I am on the latest FW

Any ideas what I have done wrong

Doug

DjDemonD

Hi Doug,

I have some sample pt1000's that we are about to begin stocking. I just measured one and it shows 1.035Kohm at about 14 degrees C.

I have got 3 connected to my cylinder delta using the following config

M305 P0 X500 R4700  			; heater 0 uses a PT1000 connected to thermistor channel 0 which has a 4.7K series resistor
M305 P1 X501 R4700  			; heater 1 uses a PT1000 connected to thermistor channel 1 which has a 4.7K series resistor
M305 P2 X502 R4700  			; heater 2 uses a PT1000 connected to thermistor channel 1 which has a 4.7K series resistor

So it might be the heater channel has to be 501,502,503 etc…

dc42

Your M305 comments don't match the parameters values. Your first M305 command says that the bed heater channel uses a PT1000 connected to the bed thermistor input. The second one says that your E0 heater uses a PT100 sensor connected to a daughter board. Nothing about a PT1000 connected to E0 thermistor input.

Dougal1957

no this is for the bed Simon I intend to use a PT100 in the hotend

I have tried X501 for P1 as well with the same results. also with and without the R4700

Dougal1957

Thank you David that was the Clue I needed all now sorted.

I did indeed put it on the E0 thermistor input instead of the bed one Doh

Doug