So, this weekend was a local hamfest (ham radio swap meet) and I
picked up a few items which I shall put to good use....
(hamfests often have more than just radio gear; you wouldn't believe
the junk you can find :)
I got an Omega 8502 PID. This one has a thermocouple input
(configurable type), and two DC outputs, (one for heat, one for cool)
and an RS232 interface.
It's funny, this unit is mounted in a box with a power switch,
thermocouple jack, and power switch, but that's it - no holes or
wires for running a control interface out. I guess the previous owner
just used it for measuring temperatures. Ah well, it's mine now :)
I also picked up:
- a couple of solid state relays
- an impressive button I'll use for emergency stop.
- 5 pack of K-type thermocouples
- 4 pack (5 pack missing one) of K-type ceramic thermocouple jack/
I'm only slightly disappointed. The PID unit will be fine once I
upgrade my espresso machine, but won't be as useful for my roaster;
it can ramp to a setpoint over a given time, but doesn't have
programmable sequences. I guess I could have a separate program
control it via RS232, changing the set points and ramp times, but at
that point, I'd might as well do the whole PID on a computer.
but hey, can't complain too much for only $10 :)
and the SSRs were $2, the thermocouple jacks $4, and the
thermocouples were the most expensive, at $25 for the 5-pack. All
items were used, except the thermocouples, which were NIB.
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