Scalar Collector Manual D - Hobi Instrument Services
Contents
1. encapsulating the jacket and providing an adequate seal However since the seal is internal the only way to be sure is to consult the manufacturer If in doubt you can provide extra protection by sealing the ends of the boot or even encapsulating it entirely with a waterproof adhesive such as the silicone caulking that is used for sealing fish tanks2. Scalar Irradiance Fiber Optic Light Collector User s Manual Revision D October 2009 HOBIL 2s Hydro Optics Biology and Instrumentation Laboratories Inc www hobilabs com REVISIONS D October 2009 Updates regarding mounting C October 2007 Add warning against cleaning with alcohol B July 2007 Start of revision tracking DESCRIPTION The HOBI Labs Scalar Irradiance Collector shown in Figure 1 gathers light uniformly from all directions except for the portion of the sphere that is blocked by the black base and neck and transmits it to a fiber optic SMA connector in its base When mated with an appropriate fiber optic cable the light collector is fully waterproof and can be immersed to depths of 200 meters PRECAUTIONS AND MAINTENANCE Globe diameter 6 4 cm 2 5 in Length 11 cm 4 4 in not including mating connector Usable wavelength range 380 to 1000 nm Handle the globe carefully It may break if dropped Figure 1 Scalar irradiance or jarred collector Upon removing the collector from salt water before removing fiber optic cables rinse thoroughly with fresh water Do not clean with acetone pure alcohol or other harsh solvents Purified water 1s best with soap if necessary Do not allow any moisture into the SMA connector To avoid this dry the collector and SMA connector before detaching a cable from it Protect the SMA connector with a cap whenever it is not a
3. of the cable stationary rotating the collector This help to work the o ring into its groove without pinching it The connector should be hand tightened rather than using a wrench to avoid stripping the plastic threads Note that when you disconnect the SMA the o ring will usually remain on the SMA ferrule 21 500 38 1mm Figure 2 Collector base bottom view Figure 3 Inserting SMA connector with o ring in place WATERPROOFING OF FIBER OPTIC CABLES Most off the shelf cables are constructed with a waterproof outer jacket but this does not guarantee a watertight assembly The SMA connector on the end of the cable must also be properly sealed at the time of manufacture Water entry into a cable will not necessarily cause problems but it is best avoided and users should be aware of the following considerations Most high quality cables are sealed but if not the most likely entry point for water is where the cable s outer jacket enters the fiber optic connector This is normally covered by a strain relief boot as shown below This boot may or may not form a seal by itself Figure 5 SMA termination with boot removed Arrow indicates possible water entry point The arrow in Figure 5 marks the point where the jacket enters the connector At some point inside the connector the jacket ends at which point it must be sealed In high quality commercial cables the connector is typically filled with epoxy
4. ttached to a cable When attaching an SMA connector use only your fingers to tighten it Tools may apply excessive force to the threads Thoroughly clean the exterior of the collector before storing it MOUNTING The circular base of the collector has four threaded holes as shown in Figure 2 that can be used to attach it to a bracket or structure These holes are tapped with U S 4 40 threads arranged in a circle 1 06 26 9 mm in diameter 42 inch screws appropriate for mounting to brackets roughly 0 1 to 0 3 1 5 to 6 mm thick are supplied with the unit Ensure that any screws you use thread no more than 0 4 10 mm into the base Longer screws could protrude from the other side of the base and damage the globe The base also has a groove for a 2 014 o ring The o ring is not required O ring gland for 4 40 thread 4 places on 1 06 26 9mm diameter 0 40 10mm depth 2 014 ring for most applications but can be used when the collector is attached to a watertight vessel or cable assembly such as the armored cables supplied by HOBI Labs also intended for use in HOBI cable Additional holes in the base are assemblies WATERPROOFING To provide a water seal place a 3mm internal diameter Imm wide o ring supplied around the end of the cable s SMA ferrule as shown in the photograph below before screwing it into place For best results tighten the connection by holding the end
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