Master Catalog — Gems Sensors & Controls - X-8

plunger is in the fully detracted position.

Valve Coil, Molded: A coil that is encapsulated in a suitable resin.

SCFH: Standard Cubic Feet Per Hour. Generally used to measure the flow rate
of gases.

Valve Coil, Tape Wrapped: A coil that is wrapped with electrical tape as the
final insulation layer.

SCFM: Standard Cubic Feet Per Minute. Generally used to measure the flow rate
of gases.

Valve Coil's Duty, Continuous: A rating given to a valve coil that can be
energized continuously without overheating or failure under normal operating
conditions.

Secondary Voltage: The low voltage portion of a probe that senses the
presence or absence of liquid.
Sensitivity: The threshold for determining when a control senses that a probe
is in water, it is normally expressed in terms of the conductibility or resistivity
of the liquid.
Setpoint: The exact pressure at which the electrical circuit controlled by the
switching element changes state. Setpoints can be specified on rising or falling
pressure (vacuum).
Setraceram™: A patented, ceramic/glass sensing element, used by Gems
in barometric transducers and instruments requiring the highest degree of
measurement precision and stability.
Shading Ring: A copper or silver component inserted into the stop of AC
voltage valves. It is required to hold the plunger positively against the stop and
prevent buzz.
Simplex: Pump system which includes motor starter for a single pump.
Single Pole Double Throw: (SPDT) A three wire or three terminal electrical
switching element that has one normally open (NO) and one normally closed
(NC) circuit with no pressure applied. It can be wired as either an NC circuit, NO
circuit or both.
Socket: Connector with 8-pin or 11-pin circular pattern that is used with module
type control.
Solenoid Valve's Cycle Life: A term generally used to express the total life
expectancy of a valve in cycles.
Solenoid Valve's Cycle Rate: The number of times a valve is capable of
opening and closing in a particular time interval, usually one second.
Solenoid Valve's Duty Cycle: The longest time that a valve is energized,
followed by the shortest time that it is de-energized, expressed as a percent as
follows: (On Time/(On Time + OFF Time)) x 100.
Span: The algebraic difference between the limits of the range.
Ex: .1 to 5.1 Volts DC; span is 5 VDC. Sometimes used to designate full scale
output; Ie 5 VDC.
SPDT: Single Pole Double Throw contacts.
System Pressure: The pressure at which a system is normally expected to
operate at, not including spikes or surges.

APPENDIX X

GLOSSARY

Valve Coil's Duty, Intermittent: A coil not designated for continuous duty
service, but which will perform satisfactorily for a specific duty service.
Valve, Direct Acting: A solenoid valve in which flow is controlled as a direct
result of the plunger movement.
Valve, Latching: A solenoid valve which utilizes the flux of a permanent magnet
to stay in its energized position without consuming any electrical power. " Latch "
means plunger is up against stop orifice. " Un-Latch " means plunger is down
against body orifice.
Valve, Isolation: A solenoid valve with an internal diaphragm separating the
plunger and guide assembly from the fluid passing through the valve; therefore,
the fluid contacts only the valve body material and the diaphragm material.
Valve, Solenoid: An electro-mechanical device that controls fluid flow direction,
pressure, or flow rate.
Valve's Cv Factor: An orifice flow rate coefficient that represents the quantity of
water, at 68°F and in GPM, which will flow through a valve with a 1 psi pressure
drop.
Valve's Cycle: A complete operation of a solenoid valve, i.e., opening a
normally closed valve and then closing it, equals one cycle.
Vented Pressure Switch: A pressure switch, usually with a low pressure or low
vacuum setting, with a means to interface with the surrounding atmosphere.
The vent allows the setpoint to remain stable despite changing temperatures,
altitudes and atmospheric conditions. The vent also exposes the internal
mechanical and electrical mechanism to the effects of the atmosphere.
Volt: The basic unit of measurement for electromotive force or potential
difference.
Voltage, Hold: The voltage, equal to or less than nominal voltage, applied to the
coil after a Spike Voltage to keep the valve energized.
Voltage, Nominal: The voltage for which the valve is rated should be applied to
the coil of the valve.
Voltage, Spike: The voltage, greater than nominal voltage, applied to the coil
for approximately 50 milliseconds to energize the valve. The voltage is then
reduced to a Hold Voltage level.

Time Delay: The period of time that a Warrick control will wait to change state
after liquid leaves the probe (on rising level, the amount of time relay will wait
after liquid contacts the probe).
Torr: A unit of low pressure equal to a head of 1 mm of mercury, or 133.3 N/2.
U.L.: Underwriter's Laboratories Inc., a testing agency for products sold in the
United States.
UST: Underground Storage Tank
Vacuum: Any amount of pressure that is less than the atmospheric pressure.
Usually expressed in terms of millibar, ˝Hg or psiv.
Vacuum, Low: Pressure at less than atmospheric pressure. 0 to -15 psi, or 0 to
29.5 in. Hg vacuum, or 760 to 25 Torr range.
Vacuum, Medium: Pressure at less than atmospheric pressure. 25 to 1x10-6
Torr range.
Vacuum, High: Pressure at less than atmospheric pressure. 1x10-6 to 1x10-17
Torr range.
Valve Body: Part of the valve that contains the inlet and outlet ports.
Valve Coil, Insulation Class: Identification of coils according to three general
temperature insulating classes - Class B (130°C), Class F (155°C), and Class H
(180°C).
Valve Coil, Encapsulated: A coil and housing that are assembled and filled
with epoxy. Typically required for applications where vibration or moisture
conditions present a problem.
Appendix / p8of13 / 10-JUN-14

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