PT100 and Display

minzabud

Hi, looking for help on what to purchase for reading temperature from a tank, i would like to mount the display max 10m from the probe head and wont be used for PID loops or any control 4/20ma etc... Basically just for visual inspection of temperature for trending.

Looking for something 24v and basic on radionics but not sure what will work with what:

https://ie.rs-online.com/web/p/platinum-resistance-temperature-sensors/8968406/

https://ie.rs-online.com/web/p/pid-temperature-controllers/7604595/

any help appreciated

brightspark

That appears to be more complicated (expensive) than you need as it is a controller as well as display unit.

How is the temperature currently being controlled?

Do you need it to alarm if the temp goes outside of a range?

edit: you could try extending the cable on this?

https://www.dx.com/p/1-5-lcd-temperature-humidity-measuring-thermometer-hygrometer-black-2-x-lr44-349601#.W9r2tJP7TIU

(they take about six weeks to arrive though)

2011

Main components:
1) PT100 - most people use a 3 wire version
2) Temp transmitter. Use a good one such as Rosemount to avoid drift.
3) 4 to 20mA loop powered display such as a Beka.

Simple enough.

minzabud

Thanks for the reply.

Wont need any alarming, there is no heating or cooling to the tank, it will be used for trending and tracibility going forward to standardise the process, the probe itself will need to be stainless and at least 150mm long.

brightspark

Okay, it seems then you need a data logger instead of a controller.

2011

minzabud wrote: »

Thanks for the reply.

Wont need any alarming, there is no heating or cooling to the tank, it will be used for trending and tracibility going forward to standardise the process, the probe itself will need to be stainless and at least 150mm long.

A probe that short suggests a very small tank. Normally the proble would be installed in a thermowell.

brightspark

Perhaps

https://www.micronmeters.com/product/tr45-temperature-logger-pt100-pt1000-thermocouple-sensor-bluetooth

in conjunction with whatever probe you want to use.

Tuco88

ABB make the best pt100 or hockey puck if you will, imo.

brightspark

https://ie.rs-online.com/web/p/data-loggers/7320581/

At €302+vat RS are not cheap when it comes to loggers with displays