Screen guards

Adequate fresh air ventilation is necessary. This is to overcome the heating and drying effect of computers, and to reduce the ionisation of the air by static electricity. Screen guards that are earthed can also reduce static build-ups on the screen. 

A typical hydraulic press of lOOkN ( 10 ton ) capacity is shown in Fig. 16.4. This model has a ram advance speed of 475mm/s, a pressing speed of 34mm/s and a return speed of 280 mm/s. The model shown is fitted with a Ught-screen guard operated by a continuous curtain of infra-red light. 

Detector E, ESA 5100A, 5011 analytical cell, 5020 guard cell, electrode 2 0.6 V (detection), electrode 1 0.2 V (impurity screening), guard cell 0.65 V (mobile-phase conditioning) (plasma) UV 286 (urine)... 

Lenses, wind screens, attractive signboards, TV-screen guards. 

Maintenance of guards on machinery, open vessels, handrails, screens at sampling/ drumming-up points etc. and on glass equipment Use of sparkproof tools where appropriate Record-keeping... 

A guarded machine is an open machine in which all openings giving direct access to live metal or rotating parts (except smooth rotating surfaces) are limited in size by the structural parts or by screens, baffles, grilles, expanded metal, or other means to prevent accidental contact with hazardous parts. 

Place guard screens in front of all the fragile apparatus that are likely to be submitted to pressures they are not going to withstand. 

Some are attached to headgear and equipped with a chin-guard to prevent upward splashing of acids/alkalis The transparent screen is commonly made of polycarbonate Heavier special versions are available e.g. for welding... 

Dirt buildup on the motor s cooling-air fan guard screen. 

Good quality safety shields and screens for guarding potentially violent reactions. 

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