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john.connett
@john-connett
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166 kWhs
Joined: Aug 2, 2023
Last seen: Aug 21, 2024
Profile Activity
Topics: 3 / Replies: 17
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RE: Convert Pt1000 to NTC 20 kΩ?

A reply from Vishay: your inquiry: "Are you aware of a device or method of converting the resistance output from a Pt1000 sensor to the equivalent r...

4 months ago
Forum
Thermostats, TRVs, Pumps, Valves, Radiators & Controls
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RE: Convert Pt1000 to NTC 20 kΩ?

I asked OHMIGO® what curve they used for their NTC 20 kΩ table and received a very swift and useful reply: There are small variations between suppli...

4 months ago
Forum
Thermostats, TRVs, Pumps, Valves, Radiators & Controls
Reply
RE: Convert Pt1000 to NTC 20 kΩ?

Good suggestion. I am in the process of doing something similar to see which of the 15 (1-14, 17) Vishay curves is a good fit (It will also be interes...

4 months ago
Forum
Thermostats, TRVs, Pumps, Valves, Radiators & Controls
Reply
RE: Convert Pt1000 to NTC 20 kΩ?

It works fine but the integration with the rest of the system is rather clumsy. For solar back off, a relay in the SKSC2 drives a contactor which adds...

4 months ago
Forum
Thermostats, TRVs, Pumps, Valves, Radiators & Controls
Reply
RE: Convert Pt1000 to NTC 20 kΩ?

Requirements are for reliability and acceptability to heating installers / maintainers. Ideally, a ready made device with safety approvals (may not ex...

4 months ago
Forum
Thermostats, TRVs, Pumps, Valves, Radiators & Controls
Reply
RE: Convert Pt1000 to NTC 20 kΩ?

My guess would be a Digital potentiometer. Might need a logarithmic one to cover the NTC 20 kΩ resistance range? I'm not an electrical engineer so thi...

4 months ago
Forum
Thermostats, TRVs, Pumps, Valves, Radiators & Controls
Reply
RE: Convert Pt1000 to NTC 20 kΩ?

The Pt1000 Resistance Table is straightforward. NTC Thermistors, Resistance/Temperature Conversion is more complex. I know it should measure 20 kΩ at ...

4 months ago
Forum
Thermostats, TRVs, Pumps, Valves, Radiators & Controls
Reply
RE: Convert Pt1000 to NTC 20 kΩ?

Probably should have mentioned that the solar collectors are on a second floor sloping roof. Front of the house is almost on the footpath. Access to s...

4 months ago
Forum
Thermostats, TRVs, Pumps, Valves, Radiators & Controls
Topic
Convert Pt1000 to NTC 20 kΩ?
4 months ago
Forum
Thermostats, TRVs, Pumps, Valves, Radiators & Controls
Replies: 15
Views: 724
Reply
RE: Zehnder ComfoPost CW6 with ASHP?

I would like to know if they offer design advice and can recommend installers that might consider upgrading my existing system. There is a good supply...

1 year ago
Forum
Air Source Heat Pumps (ASHPs)
Topic
Zehnder ComfoPost CW6 with ASHP?
1 year ago
Forum
Air Source Heat Pumps (ASHPs)
Replies: 3
Views: 806
Reply
RE: Ecodan. How to run this efficiently with zero understanding.

Oops! Wrong pump. I have been informed that we have Grundfoss UPM3 HYBRID 25-70 180 ACA pumps. Sorry for the confusion. According to UPM3 Installation...

1 year ago
Forum
Air Source Heat Pumps (ASHPs)
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