Auxiliary devices

Valve-Control Deviee.s Devices mounted on the control valve that interface various forms of input signals, monitor and transmit valve position, or modify valve response are valve-control devices. In some applications, several auxiliary devices are used together on the... 

Resistance meastirement of all w indings and auxiliary devices (heaters and thermistors, etc.), when the machine is cold (at room temperature)... 

Refer to Figures 15.8 and 15.9. These transformers are quite different from a measuring or a protection transformer, particularly in terms of accuracy and short-time VA ratings. They are installed to feed power to the control or the auxiliary devices/components of a... 

Std. 303 Recommended Practice for Auxiliary Devices for Motors in Class 1, Groups A, B, C, and D, Division 2 Locations RP 446 Recommended Practice for Emergency and Standby Power Systems for Industrial and Commercial Applications... 

The set pressure tolerances of pressure relief valves are not to exceed +2 psi for pressures up to and including 70 psig and +3% for pressures above 70 psig. Indirect operation of safety valves, for example, by pilot valve, is not acceptable unless the primary unloading valve will automatically open at not over the set pressure and will operate fully in accordance with design relieving capacity conditions if some essential part of the pilot or auxiliary device should fail [1]. 

A propeller fan consists of a propeller or disc wheel within a mounting ring or plate. The propeller fan is designed to move air from one enclosed space to another or from indoors to outdoors or vice versa in a wide range of volumes at low pressure. (The automatic type of shutter illustrated in the cutaway opposite is not a part of the propeller fan but is an auxiliary device to protect the fan when not operating by keeping out wind, rain, snow, and cold). 

If the pumps are located indoors, a Division 1 classification is likely to apply. Motors must be Class 1, group D, explosion-proof, or they may be separately ventilated with clean outside air brought to the motor by fans. Auxiliary devices such as alarm contacts on the motor must be suitable for the area classification. The installed costs, overall efficiencies, and service factors associated with the enclosures that are available will influence the selection. 

An effective auxiliary device frequently used with packing and rotary shafts is the seal cage (or lantern ring), shown in Fig. 10-108. The seal cage provides an annulus around the shaft for the introduction of a lubricant, oil, grease, etc. The seal cage is also used to introduce liquid for cooling, to prevent the entrance of atmospheric air, or to prevent the infiltration of abrasives from the process liquid. 

Some of the above HE s (especially cast TNT) cannot be initiated by a detonator alone unless its primary and base chges are very large. For such expls, an auxiliary device, called booster (See Vol 2 of Encycl, p B 243 R) is placed betw the detonator and the main chge. The expls comprising boosters are easier to detonate than cast TNT and they include pressed Tetryl, PETN or RDX. PA TNT, in powder form, can also be used... 

Auxiliary devices such as tube spacers are available for use by the patient. Some examples are Inspirease and Inhalaid devices [20], Since they are provided separately from the MDI to the patient, they should not be considered part of the process validation. One such product however, triamcinalone Acetonide MDI, is fitted with its own spacer, and in this case the spacer is considered to be an integral part of the product. 

Devices mounted on the control valve that interface various forms of input signals, monitor and transmit valve position, or modify valve response are valve control devices. In some applications, several auxiliary devices are used together on the same control valve. For example, mounted on the control valve, one may find a current-to-pressure transducer, a valve positioner, a volume booster relay, a solenoid valve, a trip valve, a limit switch, a process controller, and/or a stem position transmitter. Figure 8-80 shows a valve positioner mounted on tne yoke leg of a spring and diaphragm actuator. 

The sintering machine is a relatively small part of the equipment needed for a complex sintering plant. Auxiliary devices include conveying and storage equipment, mixing and proportioning equipment, fans, dust collectors, etc. 

Downstream of the die, the extrudate (melt) is calibrated, cooled and packaged by an array of ancillary auxiliary devices including vacuum calibrators, water tanks, cooling rolls, haul-offs, cutters, and winders (Chapter 18). Upstream of the die, a melt pump may be interposed between the extruder and the die to produce a more uniform extrudate. The exact selection and arrangement of these component parts of an extrusion system will depend on the end product and tolerance requirements that have to be met.25 27> 33> 143 196>476... 

Desired cards selected by manual manipulation of needles in holes or slots. Multiple needles may be used with certain auxiliary devices... 

A more influential market driver is the growth of electric and electronic systems on vehicles. The demands come not only from a variety of comfort, convenience, communications, and entertainment features, but also from an evolution to electromechanical operation for many auxiliary devices that to date have been purely mechanical, such as power steering, valve train actuation, braking, suspensions, and air conditioning, among others. Moreover, power train electrification enables new levels of driver responsiveness and controllability in addition to fuel economy benefits. 

MaKI90 Tsutomu Matsumoto, Koki Kato, Hideki Imai Speeding up Secret Computations with Insecure Auxiliary Devices Crypto 88, LNCS 403, Springer-Verlag, Berlin 1990, 497-506. 

The selection and sizing of auxiliary devices, also called balance of plant (BOP) components, depends on their interactions with the stack and on all other possible inter-connections inside the overall system. 

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