Hand control devices

A term used in American National Standards Institute (ANSI) standards to describe any actuating control device or mechanism that prevents the operator from reaching the hazard point during normal cycling of the machine. A two-hand-control device is an example of a hostage control device. See also Two-Hand Controls. 

Tripping devices for a machine that require simultaneous application of both hands to operate the control, so that the hands of the operator are kept out of the point-of-operation area while the machine is operating. A two-hand-control device protects only the hands of the machine operator (and not other individuals) when used as a safeguarding device. See also Hostage Control Device. 

Figure 13-14. Example of a two-hand control device on a press. (From OSHA 3067.)...

Figure 12.16 Pedestal mounted free-standing two-handed control device.

British Standards Institution, BS EN 574 (ISO 13851), Safety of machinery - Two-hand control devices - Tunctkmal aspects - Principles for design, BSI, London (1996)... 

Electrical parts of machinery Interlocking devices associated with guards Electrosensitive protective equipment Emergency stop devices Two hand control devices... 

Other machine features that offer protection include moveable barriers, automatic feed systems, presence-sensing devices, emergency stop control, hand control devices and mechanisms, such as pull-out devices, restraint devices, and two-hand control. Reduced speed control is used during setup, cleaning, and maintenance. Other safety mechanisms include antikickback devices, run controls, and foot controls. 

Selection of safeguards to allow for safe access to the danger zone during normal operation, e.g. interlocking guard, two-hand control device... 

Incorrect amounts Check for improperly labeled partial containers charged., Ensure correct amount is on hand before starting Use control devices (flow, level, etc.) Modify recipe to use whole containers Modify recipe to use whole pallet or container API RP 750 CCPS G-22 CCPS G-29... 

The incineration process may be viewed as consisting of four parts (1) preparation of the feed materials for placement in the incinerator (pretreatment), (2) incineration or combustion of the material in a combustion chamber, (3) cleaning of the resultant air stream by air pollution control devices (APCDs) which are suitable for the application at hand, and (4) disposal of the residues from the application of the process (including ash, and air pollution control system residues). 

Heavy Metals and Folvnuclear Aromatics fPNA). Zinc emissions are frequently mentioned as an element that could increase significantly when burning TDF, because of the zinc content of the rubber. Because zinc oxide has a small particle size, sources controlled by scrubbers have particular concern that the zinc oxide will escape the control device. ESP s, on the other hand, would be well suited to pick up a small metallic particulate. Zinc was measured at all six plants evaluated here. Data on zinc emissions show that in all five data sets where comparison to baseline levels was available, zinc emission rates did increase,often dramatically. Figure 5-7 graphs zinc... 

Moveable barriers or gates can also be provided that open and close easily for loading and unloading of materials. Double control devices that are operated by dual switches far apart cannot be operated by a single hand. 

In handling a radioactive material, it is basically important not to hold a radiation source directly with the hand. Handle it by remote operation as much as possible. Use forceps, tongs or similar devices. In handling radioactive materials of curie level or higher, remote controlling devices such as a master-slave type manipulator must be used. 

Cell number and viability determination is not only an excellent direct process parameter, but also the basis for all specific and calculated parameters (growth rate, specific consumption and production rates). Therefore, the apphcation of a sophisticated process control system is largely dependent on a reliable cell number measurement. Most laboratories determine the cell number within the reactor by sampling and off-line analysis. This is not satisfactory because of the necessity of frequent handling, overnight attendance and problems with reproducibility. On the other hand, automatic devices are either very complicated (hke sampling photometers or sampling cell counters) or are relatively new and not validated. 

Another interface technology for effective control and interaction in VEs is speech control. Speech control in virtual environments will fadlitate tasks and exploration. Not tied to tapping onto a keyboard or moving, a control device will free the user s hands and add to the feeling of immersion (lovine 1994). 

Special adaptive equipment requirements increase with the degree of impairment and desired degree of independence in areas such as personal care, mobility, leisure, personal transportation, and employment. People are concerned that they receive the proper equipment for them to safely operate their vehicle. Access and egress equipment have the greatest maintenance requirements. Other devices such as hand controls, steering equipment, securement mechanisms, and interior controls require less maintenance. Most users of adaptive driving equipment are satisfied with the performance of such equipment. Most frequent equipment problems are minor and are repaired by consumers themselves. 

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