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- R.R.O. 1990, Reg. 1048: CONSTRUCTION MILLWRIGHT
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- Inspection and Cleaning Procedures for Fiber-Optic Connections
- PCE Instruments UK: Test Instruments
- R.R.O. 1990, Reg. 1048: CONSTRUCTION MILLWRIGHT
- Optical Test Bench
- Digital-Imaging and Optical Digital Data Disk Storage Systems
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NCBI Bookshelf. Working safely with hazardous chemicals requires proper use of laboratory equipment. Maintenance and regular inspection of laboratory equipment are essential parts of this activity. Many of the accidents that occur in the laboratory can be attributed to improper use or maintenance of laboratory equipment.
This chapter discusses prudent practices for handling equipment used frequently in laboratories. The most common equipment-related hazards in laboratories come from devices powered by electricity devices for work with compressed gases, and devices for high or low pressures and temperatures.
Other physical hazards include electromagnetic radiation from lasers and radio-frequency generating devices. Seemingly ordinary hazards such as floods from water-cooled equipment, accidents with rotating equipment and machines or tools for cutting and drilling, noise extremes, slips, trips, falls, lifting, and poor ergonomics account for the greatest frequency of laboratory accidents and injuries.
Understandably, injuries to the hands are very common in the laboratory. Care should be taken to use appropriate gloves when handling laboratory equipment to protect against electrical, thermal, and chemical burns, cuts, and punctures.
The use of water as a coolant in laboratory condensers and other equipment is common practice. Although tap water is often used for these purposes, this practice should be discouraged. In many localities conserving water is essential and makes tap water inappropriate.
In addition, the potential for a flood is greatly increased. Refrigerated recirculators can be expensive, but are preferred for cooling laboratory equipment to conserve water and to minimize the impact of floods. To prevent freezing at the refrigeration coils, using a mixture of water and ethylene glycol as the coolant is prudent.
Spills of this mixture are very slippery and must be cleaned thoroughly to prevent slips and falls. Most flooding occurs when the tubing supplying the water to the condenser disconnects. Hoses can pop off when building water pressure fluctuates, causing irregular flows, or can break when the hose material has deteriorated from long-term or improper use. Floods also result when exit hoses jump out of the sink from a strong flow pulse or sink drains are blocked by an accumulation of extraneous material.
Proper use of hose clamps and maintenance of the entire cooling system or alternative use of a portable cooling bath with suction feed can resolve such problems. Plastic locking disconnects can make it easy to unfasten water lines without having to unclamp and reclamp secured lines. Some quick disconnects also incorporate check valves, which do not allow flow into or out of either half of the connection when disconnected. This feature allows for disconnecting and reconnecting with minimal spillage of water.
To reduce the possibility of overpressurization of fittings or glassware, consider installing a vented pressure relief device on the water supply. Interlocks are also available that shut off electrical power in the event of loss of coolant flow and are recommended for unattended operations.
Electrically powered equipment is used routinely for laboratory operations requiring heating, cooling, agitation or mixing, and pumping. Electrically powered equipment found in the laboratory includes fluid and vacuum pumps, lasers, power supplies, both electrophoresis and electrochemical apparatus, x-ray equipment, stirrers, hot plates, heating mantles, microwave ovens, and ultrasonicators.
Attention must be paid to both the mechanical and the electrical hazards inherent in using these devices. High-voltage and high-power requirements are increasingly prevalent; therefore prudent practices for handling these devices are increasingly necessary. Electric shock is the major electrical hazard.
Although relatively low current of 10 mA poses some danger, 80 to mA can be fatal. In addition, if improperly used, electrical equipment can ignite flammable or explosive vapors. Most of the risks can be minimized by regular proper maintenance and a clear understanding of the correct use of the device.
Before beginning any work, all personnel should be shown and trained in the use of all electrical power sources and the location of emergency shutoff switches. Information about emergency procedures can be found in section 7. Particular caution must be exercised during installation, modification, and repair, as well as during use of the equipment. Trained laboratory personnel should also consult state and local codes and regulations, which may contain special provisions and be more stringent than the NEC rules.
All repair and calibration work on electrical equipment must be carried out by properly trained and qualified personnel. Before modification, installation, or even minor repairs of electrical equipment are carried out, the devices must be deenergized and all capacitors discharged safely.
All new electrical equipment should be inspected on receipt for a certification mark. If the device does not bear one of these certification marks, the device should be inspected by an electrician before it is put into service.
Each person participating in any experiment involving the use of electrical equipment must be aware of all applicable equipment safety issues and be briefed on any potential problems. Trained laboratory personnel can significantly reduce hazards and dangerous behavior by following some basic principles and techniques: checking and rechecking outlet receptacles section 7.
All V outlet receptacles in laboratories should be of the standard design that accepts a three-prong plug and provides a ground connection.
Replace two-prong receptacles as soon as feasible, and add a separate ground wire so that each receptacle is wired as shown in Figure 7. Representative design for a three-wire grounded outlet. The design shown is for A, V service. The specific design will vary with amperage and voltage.
It is also possible to fit a receptacle with a ground-fault circuit interrupter GFCI , which disconnects the current if a ground fault is detected.
GFCI devices are required by local electrical codes for outdoor receptacles and for selected laboratory receptacles located less than 6 ft 1. These devices differ in operation and purpose from fuses and circuit breakers, which are designed primarily to protect equipment and prevent electrical fires due to short circuits or other abnormally high current draw situations.
Certain types of GFCIs cause equipment shutdowns at unexpected and inappropriate times; hence, their selection and use need careful planning. Be aware that GFCIs are not fail-safe devices. They significantly reduce the possibility of fatal shock but do not entirely eliminate it.
Locate receptacles that provide electric power for operations in laboratory chemical hoods outside the hood.
This location prevents the production of electrical sparks inside the chemical hood when a device is plugged in or disconnected, and it also allows trained laboratory personnel to disconnect electrical devices from outside the hood in case of an accident.
Cords should not be routed in such a way that they can accidentally be pulled out of their receptacles or tripped over. Simple inexpensive plastic retaining strips and ties can be used to route cords safely. For laboratory chemical hoods with airfoils, route the electrical cords under the bottom airfoil so that the sash can be closed completely.
Most airfoils are easily removed and replaced with a screwdriver. Fit laboratory equipment plugged into a V or higher receptacle with a standard three-conductor line cord that provides an independent ground connection to the chassis of the apparatus see Figure 7.
Ground all electrical equipment unless it is double-insulated. This type of equipment has a two-conductor line cord that meets national codes and standards.
The use of two-pronged cheaters to connect equipment with three-prong grounded plugs to old-fashioned two-wire outlets is hazardous and should be prohibited. Standard wiring convention for V electric power to equipment. Use a standard three-conductor extension cord of sufficient rating for the connected equipment with an independent ground connection. In addition, good practice uses only extension cords equipped with a GFCI. Install electrical cables properly, even if only for temporary use, and keep them out of aisles and other traffic areas.
Install overhead racks and floor channel covers if wires must pass over or under walking areas. Do not intermingle signal and power cables in cable trays or panels. Special care is needed when installing and placing water lines used, for example, to cool equipment such as flash lamps for lasers so that they do not leak or produce condensation, which can dampen power cables nearby.
Equipment plugged into an electrical receptacle should include a fuse or other overload protection device to disconnect the circuit if the apparatus fails or is overloaded. This overload protection is particularly useful for equipment likely to be left on and unattended for a long time, such as variable autotransformers e.
If equipment does not contain its own built-in overload protection, modify it to provide such protection or replace it with equipment that does. Overload protection does not protect the trained laboratory personnel from electrocution but does reduce the risk of fire. Laboratory personnel should be certain that all electrical equipment is well maintained, properly located, and safely used. To do this, review the following precautions and make the necessary adjustments prior to working in the laboratory:.
All laboratories should have access to a qualified technician who can make routine repairs to existing equipment and modifications to new or existing equipment so that it will meet acceptable standards for electrical safety.
When operating or servicing electrical equipment, be sure to follow basic safety precautions as summarized below. Unless laboratory personnel are specially trained to install or repair high-current or high-voltage equipment, reserve such tasks for trained electrical workers. The following reminders are included for qualified personnel:. The use of water aspirators is discouraged. Their use in filtration or solvent-removal operations involving volatile organic solvents presents a hazard that volatile chemicals will contaminate the wastewater and the sewer, even if traps are in place.
Water and sewer contamination may result in violation of local, state, or federal law. These devices also consume large volumes of water, present a flooding hazard, and can compromise local conservation measures. Distillation or similar operations requiring a vacuum must use a trapping device to protect the vacuum source, personnel, and the environment.
This requirement also applies to oil-free Teflon-lined diaphragm pumps. Normally the vacuum source is a cold trap cooled with dry ice or liquid nitrogen. Even with the use of a trap, the oil in a mechanical vacuum trap can become contaminated and the waste oil must be treated as a hazardous waste. Vent the output of each pump to a proper air exhaust system. This procedure is essential when the pump is being used to evacuate a system containing a volatile toxic or corrosive substance.
Failure to observe this precaution results in pumping the untrapped substances into the laboratory atmosphere. Scrubbing or absorbing the gases exiting the pump is also recommended. Even with these precautions, volatile toxic or corrosive substances may accumulate in the pump oil and thus be discharged into the laboratory atmosphere during future pump use. Avoid this hazard by draining and replacing the pump oil when it becomes contaminated.
Follow procedures recommended by the institution's environmental health and safety office for the safe disposal of pump oil contaminated with toxic or corrosive substances. General-purpose laboratory vacuum pumps should have a record of use to prevent cross-contamination or reactive chemical incompatibility problems.
Belt-driven mechanical pumps must have protective guards.
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R.R.O. 1990, Reg. 1048: CONSTRUCTION MILLWRIGHT
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Vision Equipment technicians completely disassemble your slit lamp and replace any worn or broken parts. Each individual part is fully inspected and cleaned, and topped off with a high quality finish. Call for a quote today. Vision Equipment lens edger restoration services give you all of the same benefits of a new edger refurbishment without the investment. Keep your lens edger running like new.
The Scheme aims at facilitating technology upgradation by providing upfront capital subsidy to SSI units, including tiny, khadi, village and coir industrial units, on institutional finance credit availed of by them for modernisation of their production equipment plant and machinery and techniques. The eligible amount of subsidy calculated under the pre-revised scheme was based on the actual loan amount not exceeding Rs. It is in this background that the Finance Minister made an announcement in the Budget Speech of to raise the ceiling for loans under the Scheme from Rs. Further, in the light of the experience gathered in implementing the Scheme, certain other modifications were also required to make it more useful to the SSI units, including tiny, khadi, village and coir industrial units, in taking up technology upgradation on a larger scale. The revised scheme aims at facilitating technology upgradation by providing 15 per cent upfront capital subsidy with effect from the 29 th September, 12 per cent prior to Priority shall be given to Women entrepreneurs. Existing SSI units registered with the State Directorate of Industries, which upgrade their existing plant and machinery with the state- of -the -art technology, with or without expansion. Capital subsidy at the revised rate of 15 per cent of the eligible investment in plant and machinery under the Scheme shall be available only for such projects, where terms loans have been sanctioned by the eligible PLI on or after September 29, Industry graduating from small scale to medium scale on account of sanction of additional loan under CLCSS shall be eligible for assistance. Eligibility for capital subsidy under the Scheme is not linked to any refinance Scheme of the Nodal Agency ies.
Inspection and Cleaning Procedures for Fiber-Optic Connections
Costco Optical prides itself on having some of the most knowledgeable employees in the industry. Our staff consists of trained opticians that are well regarded in the optical industry. You can feel confident that you are receiving the best possible care when visiting the Costco Optical department. Our Optical departments also carry a wide range of contact lenses, brand-name designer frames and sunglasses and offers the latest technology in high-definition lenses.
NCBI Bookshelf. Working safely with hazardous chemicals requires proper use of laboratory equipment. Maintenance and regular inspection of laboratory equipment are essential parts of this activity. Many of the accidents that occur in the laboratory can be attributed to improper use or maintenance of laboratory equipment. This chapter discusses prudent practices for handling equipment used frequently in laboratories. The most common equipment-related hazards in laboratories come from devices powered by electricity devices for work with compressed gases, and devices for high or low pressures and temperatures. Other physical hazards include electromagnetic radiation from lasers and radio-frequency generating devices. Seemingly ordinary hazards such as floods from water-cooled equipment, accidents with rotating equipment and machines or tools for cutting and drilling, noise extremes, slips, trips, falls, lifting, and poor ergonomics account for the greatest frequency of laboratory accidents and injuries.
PCE Instruments UK: Test Instruments
This document describes inspection and cleaning processes for fiber optic connections. It is important that every fiber connector be inspected and cleaned prior to mating. The procedures in this document describe basic inspection techniques and processes of cleaning for fiber optic cables, bulkheads, and adapters used in fiber optic connections. Note : This document is intended for use by service personnel, field service technicians, and hardware installers. Clean fiber optic components are a requirement for quality connections between fiber optic equipment. One of the most basic and important procedures for the maintenance of fiber optic systems is to clean the fiber optic equipment. Any contamination in the fiber connection can cause failure of the component or failure of the whole system.
R.R.O. 1990, Reg. 1048: CONSTRUCTION MILLWRIGHT
Optical Test Bench. Image Science offers a comprehensive range of optical test equipment for MTF measurement and other performance-related parameters. It is composed of images, split into train images and test images. It has basic video setup and evaluation patterns aimed at the general consumer, but also patterns and features designed for use by professional calibrators, reviewers, and even manufacturers. This simple online test will help you determine whether you have fully functional depth perception AKA stereoscopic vision, binocular vision, 3-D vision. Find more information about our hardness testers here. Buy from Steam Benchmark your PC with tests based on real-world apps and activities. For the train images, the fixation data of 18 observers is available, but 6 observers are held out. Bola Technologies is the new standard for flexible, configurable optical instrumentation and components.
Optical Test Bench
Telemetry is the collection of measurements or other data at remote or inaccessible points and their automatic transmission to receiving equipment for monitoring. Systems that need external instructions and data to operate require the counterpart of telemetry, telecommand. Although the term commonly refers to wireless data transfer mechanisms e.
Digital-Imaging and Optical Digital Data Disk Storage Systems
PerkinElmer, Inc. Its capabilities include detection, imaging, informatics, and service. PerkinElmer produces analytical instruments, genetic testing and diagnostic tools, medical imaging components, software, instruments, and consumables for multiple end markets.
NARA's Technology Research Staff conducted a nationwide survey of Federal government agencies to identify existing optical digital data disk installations. This data collection process obtained up-to-date user experiences, and helped to gather insights into system administrator's plans for applying optical digital data disk technology within their respective agencies. The survey process identified a diverse universe of small, mid-range, and large sized systems storing raster image and digital data. System criteria used to select the fifteen site visits included:.
The 36 occupational families range from WG to WG Each occupational family has its own group number and title which makes it distinctive from every other family grouping. The following is a list of the Wage Grade families with links to current job vacancies. There were , federal wage grade workers employed in this group as of March of which 1, work overseas in foreign countries.