Overview of Modes
Chapter Three: Overview
80
Overview of the Five Modes
Normal
Normal Mode is the default mode, and is a general system status mode. When in this mode, the
default is for the channel 1 pressure reading to appear in the main display. The exception to this
is if all four channels are used, whereupon the pressure reading for channel 4 appears in the main
display. Channel 4 can only be monitored in the main display.
Leakage
Leakage Mode is indicated by the legend
LEAKAGE
. Leakage Mode is similar to Normal
Mode because the same functions can be performed in both modes. The major difference is what
is shown in the Main display. Instantaneous leakage, or leakage rate is shown in the main
display when the unit is in Leakage Mode.
Leakage Rate is the rate of pressure change over a user-defined time period. Instantaneous
leakage is the difference between base pressure and the current sensor reading. Base pressure
simply means the initial pressure recorded when Leakage Mode is first entered. Base pressures
are stored for each channel.
Leakage Mode can be used as a general system status mode, or for maintenance. If a system
does not maintain its pressure, this mode can be used to show how fast the system is leaking.
Normal and Leakage Mode Sensor Status Messages
In addition to a normal display of pressure, the 146 unit provides important sensor status
information in the channel displays. When appropriate, this information replaces the display of
pressure. The status information is presented as follows:
Normal and Leakage Mode Status Codes
A blank display
No channel installed.
E0
Disconnected sensor.
If any sensor becomes disconnected from a powered channel, the
NO SENSOR
legend appears on the right side of the window, and the
channel’s pressure reading is replaced with E0.
E1
Bad sensor.
A sensor is considered bad if it is unable to provide pressure
information. This determination is sensor dependent. The bad
sensor’s pressure reading is replaced with E1.
" - - - - "
Underrange sensor (lower segments of the display are turned on)
When a sensor’s input goes under range, the
UNDERRANGE
legend
appears on the right side of the window.
Table 33: Normal and Leakage Mode Status Codes
(Continued on next page)
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