Methane and Carbon Dioxide Case

Case specifically for use with the Figaro NGM2611-E13, Adafruit DHT22, AtlasScientific EZO-CO2 sensor, and an external power source. Which informs the sensor plate, cable glands, and power supply (length of case). [TODO: If we removed / generalized the sensor plate and cable glands requirements / instructions this could generally be for a 12" elongated case]: #

Bill of Materials and Potential Supplier or Drawing

Item	Case Qty	Buy Qty	Supplier Part # / CAD link
3" ABS Schedule 40 Pipe	11"	10'	Menards 6881155
3" ABS Hub x Hub Coupler	2	1	Menards 6881537
-341 EPDM 70A O-ring	2	15	McMaster-Carr 9557K316
18-8 Stainless Steel Threaded Rod 3/8" -16	3	2'	McMaster-Carr 98920A031
18-8 Stainless Steel Hex Nuts 3/8" -16	24	100	McMaster-Carr 91845A031
18-8 Stainless Steel Washers 3/8"	24	100	McMaster-Carr 92141A031
5" Copper Mesh/Gauze	20"	100'	McMaster-Carr 6361T16
Dow Corning 111 Molykote	Consumable	5.3 Fl oz	McMaster-Carr 1204K32
Dessicant Packet	1	1000	McMaster-Carr 2189K34
11" Cable Ties	4	100	McMaster-Carr 7130K55
Dome Cap Cable Gland 1/2" NPT .19-.35" w/ O-Ring & Locknut	1	1	elecDirect RDC13NR
Dome Cap Cable Gland .11-.26" w/ O-Ring & Locknut	1	1	elecDirect RDC07AA
3/4" wide Velcro	1"	5'	McMaster-Carr 9273K13-9273K133
18-8 Stainless Steel Phillips Flat Head #6 x 1/2" Screws	6	100	McMaster-Carr 90065A148
3/4" x 3/4" Nylon Bar	1'	1'	McMaster-Carr 8732K17
1/4" Clear Acrylic Lid Plate*	1	NA	CAD Drawing 3inch
1/4" Clear Acrylic Sensor Plate*	1	NA	CAD Drawing 3inch
1/4" Clear Acrylic Cage Plate*	1	NA	CAD Drawing 3inch
ABS Cement	Consumable	NA	Menards 6932185

*Flare Tech Laser & Design

Diagrams

[TODO: add images to markdown file ]:#

Annotated Case Diagram3" Acrylic Plates CAD drawing

Build Process

Tools & Skills

• Horizontal/Vertical Metal Cutting Band Saw to cut steel threaded rod to length

• Reed TC4QP Tubing Cutter for plastic pipe to cut ABS to length

• 2x 9/16 SAE combination wrench for hex nuts

• Milwaukee 6in Diagonal Cutting Pliers for copper mesh and cable ties

• Measuring tape

• #2 phillips head screw driver / drill bit

Parts Fabrication

• Cut steel threaded rod in half to 1' lengths

• Cut two 1-21/32" length sections of ABS, 20/32 to 22/32 is acceptable, too little won't hold the o-ring in place, too much won't compress the o-ring enough to seal properly

• Cut 20" of copper mesh x2

• Attach both cable glands through their respective holes in acrylic sensor plate

Assembly & Waterproofing

1. Add cable glands to sensor plate

2. Insert ABS 1-21/32" length into each end of coupling

3. Add O-Rings around ABS

4. Add nuts & washers to rods

5. Add plates & housing to rods

6. Wrap copper mesh around sensor cage and use cable ties to hold in place