66
“HI Pressure “error will report. If the test pressure falls below the mark during the Settle step, a “Gross Leak” error
will report.
Pressure Regulator
Isaac uses a precision pressure regulator that controls line pressure. The pressure regulator
is adjusted during setup to set test pressure.
Pressure Standard
A precision measuring instrument that can be connected to Isaac as part of a pressure or flow
calibration. The pressure standard must have the required accuracy,
stability, and repeatability to measure Isaac’s
output. The pressure standard must have current calibration documentation if the customer needs to prove
accuracy traceability.
Pressure
The relative force of a compressed air or gas. Isaac is generally configured to use psig, which is the
force of compressed gas relative to barometric pressure. Alternatively, mbar (millibar of 1/1000 bar) , mmHg
(millimeters of mercury), inH2O (inches of water) or kPa (Kilo Pascal) may be selected.
Pressure Transducer
An electro-mechanical device (also called a sensor) that converts pneumatic pressure into
electrical signals. Isaac’s pressure transducers are rugged, accurate, repeatable, and have a very low internal
volume.
Programs
Data (such as test pressure, test time,
and reject levels) entered by the user and stored in Isaac’s
battery-backed RAM. A program is setup in Isaacs
Program
screen. The
Isaac has 100 test programs
.
Ramp
To slowly increase pressure by routing test pressure through the flow control valve located on back of Isaac.
Various ramp rates can be established by adjusting Isaac’s built
-in flow control.
Reject Level
The amount of pressure drop allowed in a pressure decay test. This value is set in the program
setup screen. The reject level, together with test time, determines the amount of acceptable leak rate.
RS232
A standard serial communications protocol used by most computers and computer peripherals. Isaac uses
an RS232 protocol to send test result data to printers and computers.
SCCM
Abbreviation for Standard Cubic Centimeters per Minute. This is a flow measurement standardized to 68
degrees Fahrenheit and 14.7 psi (average sea level).
Set point
A programmable threshold value (usually a minimum and maximum value) used to establish a testing
tolerance.
Settle
A time interval following fill phase that allows product to stabilize before Isaac starts the measurement
phase. Longer settle times are often required in products constructed of flexible materials.
Start Switch
The round red center lit silver pushbutton located to the left of the test ports. This button serves as
a start and abort button for the test.
