Hello,

I was wondering it is possible to use DT85 to control a solid state relay ( e.g. control voltage 24V, 13mA) through dEX web interface? If possible could you please share with me how to set a job on dEX or point me to a link. Thank you very much.

With regards
Lawrence

Good afternoon Lawrence,

Yes, It should be just like a "Normal" relay
Take a look at wiring configuration DO1 on page 318 of the current manual (UM-0085-B7) for connecting to digital inputs 1 to 4.

In dEX select Add measurement > Control > Relay and fill out the boxes

Cheers,
Roger

Hello Roger,

Thanks for you reply. I was wondering if I spice up my setup by using DT85 to control the solid state relay using an input signal from my thermocouple, can this be done in dEX or it requires Labview? I have tried your recommendation but I have to go to add>Control>relay driver. I hope they are the same.

Thank you.

Regards,
Lawrence

Good afternoon Lawrence,

Yes you can use an Alarm to operate a digital output and yes you can use dEX but it does depend on exactly what it is you want to do.

For example if you want to turn on the relay when the temperature exceeds 30 degC the the raw dataTaker code would look some thing like.

RA1S Alarm1(1TK(LM)>30)1DSO"Turn on digital 1"

in dEX you will define the thermocouple channel then click the event tab and add the alarm (Follow the dialog if you need a hand then feel free to ask me)

Note: In this example the digital input 1 will be true (1) when the alarm is true and false (0) when the alarm is false so you will need to take care with your logic.

So to start work out exactly what you want to do and is you relay normally open or normally closed. From this you can work out your logic sequence then work out your code.

Cheers,
Roger

Dear Roger,

Thanks for your suggestion, my solid state relay (SSR) is performing as expected (mostly). I have a question regarding the power setting on my DataTaker. My SSR requires 3 -32VDC power supply therefore I connected it to the 12V channel as well. When the setting on the 'power CEM using 12V output' was on "only when taking a reading' , the SSR received no power even when taking reading.

My solution was setting the 'power CEM using 12V output' on "always except when logger is asleep' but this leads to a problem. When the SSR is in operation and there is a cut off on data logging, the SSR will remains on at all the time (in this case my heating coil remains on).
I was wondering how do you cut off the power supply after we stop taking readings ?

Thank you.

With regards
Lawrence

Good morning Lawrence,

Use the command PWR12V=1 to turn the power on. (9.08 firmware)
In dEX you will need to put this in a manual channel.

Cheers,
Roger