Hoffer Flow Controls HRT1, User Manual

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Operation and Maintenance 24
HP-313 HRT1
To clear the total using a magnet, slide the magnet slowly across the
HRT1 model name at the top of the front panel overlay.
To reset the total from the front panel keypad, use the following key
sequence:
Press P
CLEArtot
is displayed
Press OK To enter edit mode.
Press
▲
To select yes
Press OK To clear total
Press
▲
To return to operating mode
5.4 System Response Time
The displayed Rate and Total are updated every two seconds. The
analog output response time to reach steady state due to a change in the
input is also approximately two seconds.
The time for the display to reach 0 and for the analog output to return to
4 mA when flow stops will be between 3 and 12 seconds, depending on
the Max Sample Time setting (MST). Changing the MST is only
recommended for low flow applications where the input frequency is
below 1 Hz. See Chapter 4 Configuration for more information on
Max Sample Time.
5.5 Error Conditions
The HRT1’s self-checking capability is used to detect and report
malfunctions by displaying error messages on the LCD. When an error
occurs, the display will flash an error message until the error condition
is eliminated, or the user presses the OK button to acknowledge the
condition. Once the error condition has been acknowledged by
pressing OK, the error message will stop flashing. The message will be
displayed again after 60 seconds if the condition that caused the error
has not been resolved. The message will automatically stop flashing
and any associated alarms reset once the error condition is no longer
present.