RAMPS and PT1000

Hi,

I have PT1000 temperature sensors from a previous project that I would like to use for my RepRap.

Can I simply plug one of these PT1000 (instead of the usual PT100) for the heatbed for example without other physical modifications? and what changes does it require other than :

#define TEMP_SENSOR_BEB 1047?

J3d

Hello this Web site shows configuration for the PT1000 sensor, hope this is what you are looking for.

[github.com].

1047 Pt1000 with 4k7 pullup
1010 Pt1000 with 1k pullup (non standard)

Thanks Robert

I plugged my PT1000 directly on the RAMPS (defined as TEMP_SENSOR_BED 1047 in Marlin) and I have a PT100 in the hotend (TEMP_SENSOR_0 1).

The two sensors are in front of me, no heating on the heatbed or extruder and the temperature of the room is about 22C.

The reading from the PT100 is 22C and it stays there, however for the PT1000 shows 32C.

When I put them in a glass with ice & water both sensors quickly show 0C, but when I take them out the PT100 gets back to 22C and the PT1000 slowly goes to 32C.

What am I doing wrong?

... you have to calibrate the PT1000 for his different temp. gradient ...

---

Viktor
--------
Aufruf zum Projekt "Müll-freie Meere" - [reprap.org] -- Deutsche Facebook-Gruppe - [www.facebook.com]

Call for the project "garbage-free seas" - [reprap.org]

I found what the problem was: this temperature sensor has a different characteristic curve

It is a nickel 6180 ppm/K instead of platinum 3850 ppm/K

Therefore I had to change the coefficients A and B for the formula in Marlin - thermistortables.h and use

#define PtA 5.485E-3
#define PtB 6.655E-6

instead of

#define PtA 3.9083E-3
#define PtB -5.775E-7

This seems to have solved the problem, although it should also have affected the temperature calculation for the Pt100 in some way...