SET UP.
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MATERIALS
[A] Digital PID temperature controller, model
CD101 with PT100 support
and voltage pulse output
Some model CD101 units will
not work; you need to make
sure that the 5th character
of its code (on a sticker on
the side) is V, for voltage
pulse output. I bought mine
(code FK02-VM*AN-NN) for
$39 from eBay, or see Sure
Electronics #RDC-TE11113
(
sureelectronics.com), $33,
This controller has 12
screw terminals. Posts 1 and
2 connect to AC power, 5
and 6 control a relay for the
heater, and 10–12 connect
to a thermocouple. If you
use a different controller,
refer to its datasheet for the
functionally equivalent connection locations.
[B] Clear acrylic storage
container, 7"× 4"× 4"
item #B000NE80GO from
Amazon (
amazon.com), $5
[C] Immersion heaters,
Norpro 559 ( 3) Amazon
#B000I8VE68, $6 each
[D] SPST rocker switch,
heavy duty #275-693 from
RadioShack (radioshack.
com), $3
[E] SPDT mini relay,
7V–9V DC, 12A RadioShack
#275-005, $4. You may want
to upgrade to a solid-state
relay for a more robust,
reliable build. The wiring is
the same for an SSR as it is
for the relay included in the
build instructions. A good
option is Lightobject #ESSR-
25DAC, $14.
[F] Aquarium pump
with suction cup “feet”
Catalina Aquarium #A801
(
catalinaaquarium.com), $10
[G] Clear acrylic sheet
(plexiglass), 7"× 2"×¼"
thick From hardware stores
or online vendors; you may
have to cut it to size with a
band saw, table saw, fine-toothed hacksaw, or jigsaw.
[H] Eye bolt, ¼"× 2",
with nut
[I] Machine screws, #4-40,
½" long, stainless steel,
with matching nuts ( 2)
[J] Sheet metal screws,
#6-40,
2" long, stainless
steel ( 2)
[K] Super glue
[L] Waterproof silicone
caulk aka tub and tile caulk
[M] Wire, 22 gauge,
stranded, 1'
[N] Wire, 14 gauge,
solid core, 4'
[O] Wire nuts, large ( 4)
[P] Electrical tape
[Q] Thermocouple
temperature sensor probe
with 3 leads #PT100 from
Virtual Village (virtualvillage.
com), or from eBay, $6
[NOT SHOWN]
Large, straight-sided
container to hold the water.
Because the bath doesn’t get
very hot or touch the food,
plastic is OK; I use a 17qt
plastic storage bin I bought
for $6 at Bed Bath & Beyond
(
bedbathandbeyond.com).
TOOLS
[S] Phillips screwdriver
[T] Wire cutters and
strippers
[U] Multimeter
[V] Soldering iron
and solder
[W] Hot glue gun
[X] Rotary cutting tool
with router bit such as a
Dremel
[Y] Hobby knife
[Z] Drill and drill bits:
1", t"
[NOT SHOWN]
CNC laser cutter (optional)
Marker
Stove and oven mitt
Bowl of cold water
107 Make:
