Sentry Sample II Low Pressure Installation, Operation & Maintenance Manual page 22

MODBUS
Figure 23. MODBUS Setup
Figure 23 shows the MODBUS setup screen. This screen allows the MODBUS address and
BAUD rate to be changed. For further information on using the MODBUS feature, please
refer to "Appendix A - MODBUS" on page 41.
PID
The PID parameters should only be changed with the assistance of Sentry Equipment. For
this reason, PID parameters are password protected. If the system needs tuning, please
contact Sentry Equipment for assistance.
Analog Inputs
Figure 24. Analog Input Menu
Figure 24 shows the analog input menu screen. This screen can be accessed by entering
202 for the Analog Input Setup Password. The cursor indicates the option you wish to
choose. Move the cursor using the ▲ and ▼ keys. Select the option using the ENTER key.
To exit this screen and return to the main menu, press the ESC key.
For information on calibrating the analog inputs, please refer to "Maintenance" on
page 27 section of this manual.
Scale
Used to change the scale of the pressure and temperature sensors.These settings are
factory set and should not be changed. Changes to the scale can result in improper
operation of the system and should be done only after consulting the factory for
assistance.
Auto Calibration
This screen is used to calibrate the inputs for the pressure and temperature sensors. See
"Maintenance" on page 27 for detailed calibration procedure.
Manual Calibration
Factory use only.
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