Chapter 6 Mechanical Input Control Devices
___ is the travel of fluid in response to a force caused by pressure or gravity.
Flow
Applications that use flow switches to detect the presence or absence of flow include ___ systems
(sprinkler, refrigeration, water treatment) hoist
A ___ switch is a switch that detects the height of a liquid or solid inside a tank.
level
A ___ switch is a mechanical input that requires physical contact of the object with the switch actuator.
limit
A pressure switch is rated according to its ___ pressure range.
operating
A(n) ___ is the device that is pressed, pulled, or rotated by the individual operating the circuit.
operator
A ___ actuator is an actuator operated by direct forward movement into the limit switch.
push-roller
In a cooling system, as the ambient temperature ___, the switch contacts close and turn on a cooling device.
rises
A selector switch is a switch with an operator that is ___ to activate the electrical contacts.
rotated
A ___ table is made and positioned near the switch to illustrate each position and each contact.
truth
A fork lever actuator is an actuator operated by one of ___ roller arms.
two
Most foot switches have ___ position(s).
two
The most common application of a joystick is in controlling a ___.
hoist
One psi equals ___ in. WC.
27.68
___ is the amount of pressure that must be removed before the switch contacts reset for another cycle after the setpoint has been reached and the switch has been actuated.
Deadband
A(n) ___ button operator can be operated from any angle and is used in applications that require fast operation such as emergency stops, motor stops, and valve shutoffs.
Jumbo mushroom
___ level switches use a float that moves up and down with the level of the liquid and activates electrical contacts at a set height.
Mechanical
In a foot switch, the ___ position is normally spring-loaded so that the switch automatically returns to that position when released.
OFF
___ sensing devices are used for high-pressure applications.
Piston
___ are the most common control switches used on industrial equipment.
Pushbuttons
___ loads are the least destructive loads to switch.
Resistive
___ switches are control devices that react to heat intensity.
Temperature
A(n) ___ is placed in a truth table if a contact is closed in any position.
X
A ___ is an operator that selects one to eight different circuit conditions when it is shifted from its center position.
joystick
A(n) ___ is the part of a switch that includes the written description of the switch's operation.
legend plate
A(n) ___ system is not a common application of temperature switches.
air compression
A ___ is not a common sensing device used by most pressure switches.
barometer
A ___ level switch detects the dielectric variation when a product is in contact with the probe and when the product is not in contact with the probe.
capacitive
A(n) ___ probe level switch is a level switch that uses liquid to complete the electrical path between two conductive probes.
conductive
A ___ is not a basic actuator used on limit switches.
contact pole
Line diagrams may use a(n) ___ to indicate which joystick position will operate the contacts.
dot
A ___ switch is a control switch that detects the movement of a fluid.
flow
Most ___ switches use a paddle to detect the movement of a product.
flow
A ___ is not a common foot switch application.
two-hand safety circuit