AC Build a Conductivity Probe

5/17/2018 AC Build a Conductivity Probe

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Part 1: Constructing the probe

Obtain the following materials:

2 - 20cm lengths of solid 22 gauge insulated wire

barrel from a plastic ink pen

2 - 10 cm lengths of 32 gauge nichrome wire

electrical tape

1. Remove approximately 1 cm of insulation from the ends of each of

the two insulated wires using a wire stripper.

2. You will need to solder the nichrome wire to the insulated wire. Forbest results, twist the two wires together before soldering. Repeatfor the second wire.

3. Take the barrel from a disposable ink pen and placeeach of the two wires that you just soldered. Useelectrical tape to tape the wires on opposite sides of the

barrel of the pen.

4. Towards the bottom of the pen barrel, expose a smallsection of both nichrome wires. The exposure should beapproximately 1 mm in width.

5. Use electrical tape to cover the rest of the nichromewire.

6. Congratulations! You have constructed a conductivity

probe!

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E X P E R I M E N T I N G

Figure 2: A stripped wire

Figure 3: A wrapped wire

Figure 4: Placing the wires

Figure 5: The completed sensor


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Part 2: Testing the probe

Now that youve made your probe, it is time to see how it responds to solutions of knownconductivity.

Obtain the following materials: Four plastic cups

Table salt

Sugar

Distilled water

Tap water

Prototyping breadboard

Jumper wire(s)

470 !resistor (yellow-purple-black)

LED

9V battery with wire connectors

1. Using a breadboard and the electrical components in the diagram, create the circuit in

the figure below. Note that the connecting points where the conductivity probe will beconnected into the circuit.

2. Have your teacher check your breadboard before continuing to step 3.

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Figure 6: Conductivity sensor testing setup


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3. Fill each of the three cups approximately halfway full with distilled water.

4. Label one cup sugar water. Label another salt water, and the final cup distilled

water.

5. Using a spatula or spoon, add a spoonful of sugar into the cup labeled sugar water.

Stir the solution until all of the sugar has dissolved.

6. Add a spoonful of table salt into the cup labeled salt water. Stir the solution until all ofthe sugar has dissolved.

7. To test your conductivity probe, immerse the tip of the probe into the sugar watersolution. Record your observations in data table 1 below.

8. Rinse the probe with distilled water and dry.

9. Repeat steps 7 and 8 with the salt water, tap water and distilled water.

10.Save your solutions for use in part 3.

Data Table 1

Solution LED glow? Observations

Sugar water

Salt water

Tap Water

Distilled water


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Figure 8. Conductivity measurement code for Arduino


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R e a d i n g : C o n d u c t i v i t y P r o b e

I $ 4 / ( $ : $ , * % % * % , ) # $ A - $ 1 ) * / % 1 : $ 2 / 0 3 ( $ ' 6 ) # $ 2 * % . $ 61 $ & ) * / % / % $ 2 $ & ) ( / 2 ; ) $ 1 ' % 6 % / % F $ 2 $ & ) ( / 2 ; ) $ 1 O

h t t p : / / w w w . c k 1 2 . o r g / c h e m i s t r y / E l e c t r o l y t e s - a n d -N o n e l e c r o l y t e s / l e s s o n / E l e c t r o l y t e s - a n d -l e c t r o l y t e s / ? r e f e r r e r = c o n c e p t _ d e t a i l s

B # $ & . ; / - ( - % 6 $ ( 1 ) ' % 6 * % , / 4 ) # $ ( $ ' 6 * % , : ; & / < 5 2 $ ) * % ,) # $ 6 * , * ) ' 2 $ G 5 $ ( * < $ % ) 2 * % . $ 6 : $ 2 / 0 Oh t t p : / / w w w . c k 1 2 . o r g / a s s e s s m e n t / t o o l s / g e o m e t r y -t o o l / p l i x . h t m l ? e I d = S C I . C H E . 4 3 2 . 4 & q u e s t i o n I d = 5 3 c e c a 6 7 d a 2 c f e 4 8 b a 6 c f c 9a & a r t i f a c t I D = 1 8 1 7 9 1 5 & b a c k U r l = h t t p % 3 A / / w w w . c k 1 2 . o r g / c h e m i s t r y / E l e c t ro l y t e s - a n d - N o n e l e c r o l y t e s / % 2 3 i n t e r a c t i v e

Q u e s t i o n s : C o n d u c t i v i t y P r o b e

?8 X/0 6*6 ;/-( 5($6*&)*/%1 )#') ;/-


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" 6 E F G 9 A 5 1 A 5 : HM $ 7 $ 2 / 5 ' % $ G 5 $ ( * < $ % ) : ' 1 $ 6 - 5 / % ; / - ( $ G 5 $ ( * $ % & $& / < 5 2 $ ) * % , 5 ' ( ) 1 ? F H 8 c X 9 K = O X / 0 & / - 2 6 ; / - - 1 $ ; / - ( 5 ( / : $

) / ) $ 2 2 ; / - 1 / < $ ) # * % , ' : / - ) ) # $ 0 / ( 2 6 ' ( / - % 6 ; / - C " # ' )0 / - 2 6 : $ - 1 $ 4 - 2 ) / . % / 0 ) # $ & / % 6 - & ) * 7 * ) ; / 4 C d X ' 7 $ ; / - (

) $ ' & # $ ( ( $ ' 6 ; / - ( 5 ( / 5 / 1 ' 2 3 ' % 6 ) # $ % ) ( ; * ) \ ` $ & / ( 6 ; / - (5 ( / & $ 6 - ( $ 3 ' 1 0 $ 2 2 ' 1 ; / - ( ( $ 1 - 2 ) 1 * % ) # $ 1 5 ' & $ : $ 2 / 0 8

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AC Build a Conductivity Probe