An Inexpensive Shelter for Climate Sensors
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An inexpensive shelter to house small temperature and humidity sensors can be constructed using Rubbermaid® salad plates. The shelter below is for the Hobo Temp sensor.
The cost is no more than $20 and a self-standing mounting apparatus can be built for $7.
Materials list for shelter:
6 white Rubbermaid® Dinnerware 8 1/4"salad
3' length of 1/4" allthread
6- 1/4" nuts
6- 1/4" washers
2ft. of 1/2" automotive heater hose
2" diameter hole saw with 1/4" pilot
Begin construction with the plates. They can be ordered directly from Rubbermaid by calling 330-264-7645 or bought at a Kmart store. They are made of a thick plastic and are quite brittle so care is required when drilling them. A large diameter hole (approximately 2") must be drilled in the center of four of the six plates. A hole saw works well. In all of the plates drill three 1/4" holes at 120° intervals about 2 1/2" out from the center.
Cut the automotive hose into 15 1" lengths. Cut the allthread into three equal lengths. Begin assembly by screwing a nut and a washer just onto the end of each allthread. Place one of the plates without the big hole face up onto the allthreads by running the allthreads through the three holes in the plate. The plate should be sitting face up resting on the washers with the allthreads sticking up into the air. Slide three of the cut hose pieces onto each of the allthreads and drop them down onto the plate. Now slide the second plate without the large 2" diameter hole down onto the allthreads so that it is resting on the hose pieces. Continue this process with the other four plates with the 2" diameter hole, stacking the plates and sandwiching pieces of hose. Take care to keep the allthreads parallel to each other and at a right angle to the table. After the last plate has been placed, screw the other three washers and nuts onto the ends of the allthreads and snug them up against the last plate. At this time some adjustments can easily be made so that the plates sit evenly and the allthreads are centered. You might want to adjust the allthreads so that most of the extra is sticking out the top to give you room to mount a stand.
Since you only need two of the allthreads to mount to the arm you can trim the third off so it is flush with the nut on the top. The diagram shows this. You will also need to devise some sort of a door to put on the bottom of the shelter to hold the data sensor in place. A narrow (about 1") piece of metal about 4" long with a 1/4" hole drilled through one end can be slid onto the end of one of the allthreads and held it in place with another nut. To insert the sensor, simply slide the metal bar to one side, insert the sensor, and slide the bar back over the hole. The nut can be tightened to hold the bar in place. A mounting stand can be constructed from PVC and angle iron. If you use the Hobo temp data logger in the shelter, the temperature sensor should be placed outside the case and covered with a piece of gauze to give accurate measurements in the shelter.
The temperature bead in the Hobo should be unwound from the electronic board and placed outside the hobo sensor. The temperature bead and the Hobo H8 Temp Logger should be placed in a gauze pocked made by stapling gauze purchased at a Pharmacy together to form a loose pocket. The gauze is to prevent condensation on the temperature bead.
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Updated: Dec 18 1996
Copyright © 1996 New Mexico State University
|Department of Agronomy and Horticulture
Box 30001 / Dept.3Q / Las Cruces, N M 88003-8003