PT100 sensor for Duet WiFi

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TN Yankee
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PT100 sensor for Duet WiFi

Postby TN Yankee » Sun Jan 15, 2017 6:42 pm

It seems as the E3D PT100 sensor & board are the most common and readily available combination. However, since the Duet Wifi uses it's own daughter card to interface to a PT100 sensor, there's no use in buying an E3D board.

In the same vein, is there a recommendation for a non-E3D PT100 sensor? I'll be using an E3D V6 & V6Lite, so the sensor has to fit those heater blocks. It would be great to find a sensor that fits the standard thermistor-style block, so I wouldn't have to buy new heater blocks.

Thanks!

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Xenocrates
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Re: PT100 sensor for Duet WiFi

Postby Xenocrates » Sun Jan 15, 2017 7:02 pm

I went looking. There are some on component's outfit's like Mouser. Of course, you'll need to build your own cable (And yes, the cable quality matters somewhat more than thermistor cabling due to a lower resistance to reference from) For example this one I don't think it would fit in the thermistor hole though, and I would be somewhat hesitant to leave it un-encapsulated anyways.

Personally, if you're going that route, pick the best sensor you're willing to spring for (Class 2B, Class B, Class A is the ascending order of quality), and buy actual RTD connection cabling+connectors, and wire it up as a 4 wire sensor (Best results)
Machines:
Rostock Max V2, Duet .8.5, PT100 enabled E3D V6 and volcano, Raymond style enclosure
Automation Technology 60W laser cutter/engraver
1m X-carve router

Sic Transit Gloria Mundi
01-10011-11111100001

DerStig
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Re: PT100 sensor for Duet WiFi

Postby DerStig » Sun Jan 15, 2017 8:10 pm

TN Yankee wrote:It seems as the E3D PT100 sensor & board are the most common and readily available combination. However, since the Duet Wifi uses it's own daughter card to interface to a PT100 sensor, there's no use in buying an E3D board.

In the same vein, is there a recommendation for a non-E3D PT100 sensor? I'll be using an E3D V6 & V6Lite, so the sensor has to fit those heater blocks. It would be great to find a sensor that fits the standard thermistor-style block, so I wouldn't have to buy new heater blocks.

Thanks!



Having just done this yesterday my suggestion is to use the E3d heater block and PT-100 sensor, and use the Duet's daughter card. Plug and play and it just works

TN Yankee
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Re: PT100 sensor for Duet WiFi

Postby TN Yankee » Sun Jan 15, 2017 9:31 pm

Thanks for the information. I likely will just use the E3D version, but I'll keep looking around a bit. I think a big clue is E3D's comment that the Ultimaker 2 uses a PT100 as standard, and the E3D is a direct replacement.

As far as the heater block goes, I'm getting the impression that they used to have 2 blocks (one for PT100, one for old thermistor style), based on some of their product pages. Now, however, a single heater block can be used for either the PT100 or thermistor cartridges. Per their wiki:
From mid-June 2016 E3D Hotends will transition to using a standard cartridge-type format for temperature sensors. These will be available as Thermistor, PT100 or Thermocouple sensors.

Cartridge-sensors are to be used with an updated design of heater-block, into which the sensor cartridge is secured using a grub screw.

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Xenocrates
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Re: PT100 sensor for Duet WiFi

Postby Xenocrates » Sun Jan 15, 2017 9:46 pm

TN Yankee wrote:Thanks for the information. I likely will just use the E3D version, but I'll keep looking around a bit. I think a big clue is E3D's comment that the Ultimaker 2 uses a PT100 as standard, and the E3D is a direct replacement.

As far as the heater block goes, I'm getting the impression that they used to have 2 blocks (one for PT100, one for old thermistor style), based on some of their product pages. Now, however, a single heater block can be used for either the PT100 or thermistor cartridges. Per their wiki:
From mid-June 2016 E3D Hotends will transition to using a standard cartridge-type format for temperature sensors. These will be available as Thermistor, PT100 or Thermocouple sensors.

Cartridge-sensors are to be used with an updated design of heater-block, into which the sensor cartridge is secured using a grub screw.

Yep. That's how it used to go (And how it was when I went over to PT100's.) It's much different and better now from my perspective.
Machines:
Rostock Max V2, Duet .8.5, PT100 enabled E3D V6 and volcano, Raymond style enclosure
Automation Technology 60W laser cutter/engraver
1m X-carve router

Sic Transit Gloria Mundi
01-10011-11111100001

TN Yankee
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Re: PT100 sensor for Duet WiFi

Postby TN Yankee » Sun Jan 15, 2017 9:51 pm

Probably a dumb question, but it just occurred to me: can the Duet wifi accommodate both a PT100 and a thermistor (e.g. from the bed)? I would think so.

dc42
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Re: PT100 sensor for Duet WiFi

Postby dc42 » Mon Jan 16, 2017 2:39 am

TN Yankee wrote:Probably a dumb question, but it just occurred to me: can the Duet wifi accommodate both a PT100 and a thermistor (e.g. from the bed)? I would think so.

Yes. Each PT100 daughter board supports 2 sensors, but the thermistor inputs are still available. By default each heater uses the corresponding thermistor input to control its temperature. A parameter on the configuration command for that channel in the config.g file on the SD card tells it to use a different thermistor channel or one of the PT100 channels instead.

TN Yankee
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Re: PT100 sensor for Duet WiFi

Postby TN Yankee » Mon Jan 16, 2017 7:31 am

Thank you, David. I had assumed it was so, but wanted to make sure.


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