USER MANUAL Radiation Shield Product number 7714 R Davis Instruments, 3465 Diablo Avenue, Hayward, CA 94545-2778 U.S.A. • 510-732-9229 • www.davisnet.
Radiation Shield (7714) The radiation shield allows the temperature sensor to accurately measure air temperature without the effects of direct radiation from sunlight.
• • • Four 1/4” x 1 1/2” (38 mm long) lag screws To attach radiation shield to a post or wall. Three #8-32 x 1” (25 mm long) screws To attach radiation shield over the top of a post (if the provided #8 x 2 3/4” pan head screws create clearance problems). Tape To hold screws in place when assembling the radiation shield. Location Tips • • • • The radiation shield works best when in a location with a steady breeze. Mount away from fences, buildings, trees, or other obstructions.
Attach the Sensor Use the radiation shield to house an external temperature sensor (Temperature Probes with RJ Connector, p/n 7817 or 6477; or Stainless Steel Temperature Probes: with RJ connector, p/n 6475 or with Two-Wire Termination, p/n 6470). In order to attach the temperature probe to the radiation shield, you will need a closed plate, both clip mounts, the cable clamp, three #4 x 1/2” pan head, selfthreading screws, three #4 flat washers, and the temperature probe.
5. Once secured, adjust the position of the sensor so the probe and approximately 1/4” (6 mm) of cable protrude from the clip mounts. 6. Place the cable clamp around the sensor cable approximately 8” (20 cm) from the probe. 7. Secure the cable clamp to one of the remaining mounting posts (using a #4 x 1/2” pan head self-threading screw and a #4 flat washer) so that a loop of cable is formed. Make sure to tighten the clamp with the flat side up and the bulge side down.
Attach the Support Plate to the Cover Plate To attach the support plate, you will need the cover plate, the support plate, three #8 x 2 3/4” pan head screws, three 1”spacers, three #8 flat washers, three #8 split lock washers, and three #8 hex nuts. 1. Slide the three #8 x 2 3/4” pan head screws up through the non-threaded holes in the shield support plate. Make sure the side of the support plate marked “UP” is in fact on top as you slide the screws in from the bottom. 2.
Assemble the Plates and Studs To assemble the plates and studs, you will need the cover plate assembly as well as the flat plate and close plate with sensor, three #8 x 5” threaded studs with attached #8 push nuts, three #8 flat washers, three #8 split lock washers, and three wing nuts. 1. Slide each of the three #8 x 5” (127 mm) threaded studs, with push nuts installed, through each of the three holes in the closed plate, flat plate, support plate, and cover plate.
If you are attaching the radiation shield to the side of a post or to a wall or a pipe: 1. Slide the three open plates and the two remaining closed plates over the threaded stud ends protruding from the top of the plate and studs assembly. Closed Plate Closed Plate Open Plate Open Plate #8 Wing Nut #8 Lock Washer Open Plate #8 Flat Washer Plates and Studs Assembly Complete Plate Assembly 2. Place the flat washers, lock washers and plastic wing nuts over the protruding stud ends. 3.
If you are attaching the radiation shield to the top of a post: The instructions for assembling the radiation shield differ slightly if you are mounting the shield on top of a wooden post. Follow the instructions below if (and only if) you plan to ultimately mount the radiation shield on top of a wooden post.
2. Place a #8 flat washer over the end of each of the #8 x 2 3/4” pan head screws. As long as the extra length of screw end protruding from the bottom of the radiation shield doesn’t create clearance problems when mounting the radiation shield, you can use the #8 x 2 3/4” pan head screws. If a clearance problem exists, you will need to use #8 x 1” screws instead (not included). 3. Slide the three #8 x 2 3/4” pan head screws (with washers) up through the holes you just drilled. 4.
Assemble the Radiation Shield To assemble the radiation shield plates you will need the plates and studs assembly, as well as the rest of the plates, three #8 flat washers, three #8 split lock washers, and three plastic wing nuts. 1. Slide the three open plates and the two remaining closed plates over the threaded stud ends protruding from the top of the plate and studs assembly.
Mount the Radiation Shield Follow the instructions below to mount the radiation shield. There are separate sections for each of the mounting options. You should modify the instructions as necessary to fit your needs. Mounting on the Side of a Post or Wall: In order to mount the radiation shield onto the side of a post or wall, you will need the radiation shield assembly, three #8 split lock washers, three #8 flat washers, and three #8 hex nuts. You will also need to supply four 1/4” x 1 1/2” (6.35 mm x 38.
Mounting on a Pipe: In order to mount the radiation shield onto a metal pip with outside diameter between 1” and 1 1/4” (25 mm and 31 mm), you will need the radiation shield assembly, three #8 split lock washers, three #8 flat washers, three #8 hex nuts, two 1 1/2” U-bolts, four 1/4” flat washers, and four 1/4” hex nuts. 1. Slide the stud ends protruding from the top of the radiation shield assembly into the holes on the mounting bracket. 2.
4. Secure the mounting bracket to the pipe using a 1/4” flat washer and a 1/4” hex nut on each end of the 1/2” U-bolts. Tighten until the mounting bracket is firmly attached to the pipe. 1/4" Flat Washer 1/4" Hex Nut 1-1/2" U-Bolts Complete Plate Assembly Mounting on Top of a Post: In order to mount the radiation shield onto the top of a post, you will need the radiation shield assembly (with mounting bracket already attached). You will need to supply four 1/4” x 1 1/2” (6.4 mm x 38.1 mm) lag screws.
Maintenance • The effectiveness of the radiation shield will be reduced if the surfaces of the shield are dirty. Wipe the surfaces of the shield with a damp cloth to remove dirt and dust. • Keep the areas between the radiation shield plates free of debris that may obstruct air flow, e.g. leaves, twigs, webs, nests. DO NOT remove nesting insects or animals by spraying insecticide or any kind into the radiation shield. This may damage the sensor and the radiation shield.
