10 Sentry Equipment Corp
The position of the pressure reduction valve and state of the valves are graphically
displayed on the user interface. Temperature, pressure, and ow are also displayed. The
Modbus feature provides added advantages including remote monitoring and control
of the system. The capabilities of Modbus are further addressed in “Appendix A” on
page41.
Operation
To ensure the protection provided by this equipment is not impaired, this equipment must not
be installed or used in any manner other than that which is specied in this manual.
Description of Controls
Table 1 and Figure 3 describe controls on the Sample Sentry II controller.
Table 1. Control Descriptions
Description Function
MENU key From the operation screen when the unit is in Manual mode, pressing
the MENU key displays the password screen for the main menu. In
order to enter the menu screen you must enter the password 101
followed by the ENTER key. If a correct password is entered, the main
menu screen appears.
From an alarm screen, pressing the MENU key clears the alarm.
ENTER key From the operation screen, pressing the ENTER key toggles the
controller between the Automatic and Manual modes.
While navigating through the menu screens, pressing the ENTER key
selects the option indicated by the cursor (►).
ESC key From the operation screen, pressing the ESC key toggles the states
between Blowdown and Sample.
While in the menu screens, pressing the ESC key exits the current
screen. Any changes are automatically saved.
Arrow keys
▲
▼
While in Manual mode, pressing the arrow keys opens and closes the
PRV.
While navigating through the menu screens, use the arrow keys to
move the cursor to the option you want to choose.
While editing elds and timers, use the arrow keys to change the value
in the current eld.
Cursor
►
Indicates the cursor position on the menu screens.
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General