Proportional current Temperature controller to control SSR

Discussion in 'General Electronics Chat' started by DuzMontana, Mar 25, 2015.

  1. DuzMontana

    Thread Starter New Member

    Mar 25, 2015
    24
    2
    Hi,

    I have a vintage Omega 7100 PID temperature controller (http://www.omega.com/manuals/manualpdf/M0966.pdf) with a proportional current output module which will feed a varying current (0-20mA) at 24VDC; I would like to control an SSR (TC: 7.5mA/12V) (heater: 110VAC-1500W) with that. I cannot have the controller programmed in a on/off mode such that I will have 0/24VDC to switch the SSR; it has to be a scale from xx mA to yy mA.

    I have two questions:
    1- Can I effectively control an SSR by surfing the trigger current or will this damage the SSR over the long term. It seems to be working with a 20W 110VAC load (lamp) on but I'd rather not improvise with the big heater.
    2- If not, what can I control effectively with this kind of temperature controller?

    Lastly, as a bonus question, it seems that Omega use to sell a 24VDC switch module that would fit this PID; anybody ever heard of that and know where I could find such module?

    Thanks for your help!

    Dan
     
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