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Probe pics
This might help.
The tube is .200 inch I.D. 316 stainless. The ss tube is press fit into a drilled out bulkhead water fitting. Both from Mcmaster Carr.
The sensor is an LM34, 10 mv/deg F output. Spec sheet at national semiconductor.
The sensor is sealed in the tube with Locktite epoxy putty from Lowes
www.mikecramer.com/images/probe1.jpg
www.mikecramer.com/images/probe2.jpg
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Final temp feedback / heater schematic
Here is the final design that I am running in the truck.
The heater element I'm using is a 100 cup coffee heater wire rope. It draws 160 ma. at 12 volts.
I insulated the bottom and sides of my bottle with closed cell foam.
www.mikecramer.com/images/tempheater.jpg
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Here is the parts list for the temperature feedback pwm with the winter temperature circuit.
The listings are in three parts. First is the part (LM34). Second is the part number used to order the part (LM34DZ). The third part is the price
($2.50).
All Electronics company parts:
LM34 Cat# LM34DZ $2.50
(2) 1 uf Cat# RM105 $1.00/4
Digi-Key parts:
5k pot CT2264-ND $1.51
(2) 49.9k 49.9KXBK-ND .49/5
6.81K 6.81KXBK-ND .49/5
(2)25.5K 25.5KXBK-ND .49/5
(2)4.99K 4.99KXBK-ND .49/5
200 OHM 200XBK-ND .49/5
47.5K 47.5KXBK-ND .49/5
100K 100KXBK-ND .49/5
3.92K 3.92KXBK-ND .49/5
10 MEG 10MQBK-ND .27
10 VOLT ZEN 1N5327BTPMSCT-ND $3.90/10
(2)FET IRL1404ZPBF-ND $3.67
LM339 LM339NFS-ND .47
Hosfelt Electronics parts:
(2) inline fuse holder 43-181 .69
10 Ga. inline fuse holder 43-180 .79
12 volt 20 amp relay 45-689 $3.95
Relay base R95-115 $6.25
Dpdt switch 51-571 $4.95
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