AW Gear Meters RT-Ex15-Ex - Manual (Page 10)

AW-Lake Company 8809 Industrial Drive, Franksville, WI 53126  web: www.awgearmeters.com
 Tel: 262-884-9800  Fax: 262-884-9810  Email: [email protected]
RT-Ex15-Ex manual rev 6.13.11.docx Revision 3.3.10
10
NOTE: The LOGO screen can be turned off, but as it will no longer appear there is no way to
access screen programming. If the LOGO display is turned off for any reason it can be restored
to allow access to screen programming by cycling the power to the RT-Ex15 while pressing and
holding the ENT button or maintaining the ENT magnetic switch. This will reactivate the LOGO
screen as DISPLAY 00 and restore access to LOGO screen programming.
RATE Display Mode
The RT-Ex15 continuously calculates rate by two methods simultaneously, Gate Time and Pulse
Width.
Gate Time - (RATE A GT. ) Rate is displayed based on the number of pulses counted during a
prescribed time period. RATE A GT is updated at the programmed interval regardless of
the input frequency. Increasing the gate time interval produces a filtering or averaging
effect useful for stable display and output of uneven or intermittent flows. The RT-Ex15
analog output is assigned to RATE A
GT. .
Pulse Width - (RATE A
PL ) Rate is displayed based on the time from pulse edge to pulse edge.
The Pulse Width Method is highly responsive, updating more frequently at high input
frequencies and less frequently at lower input frequencies. RATE A
PL is useful for
observing flow variations or peak intermittent flows. A digital filter SAMPLE A can be
used to produce a more stable display response.
RATE A
GT – RATE A Gate Time. Displays the rate by the gate time method based on the
programmed GATE AB variable and displayed based on the corresponding KFR factors, decimal
locations and engineering units. The zero cutoff frequency for display and analog output is .3
Herz. The pulse length measurement RATE A
PL can be viewed by using the SEL button or
magnetic switch while in the RATE A GT display as illustrated below. The rate display will revert
back to RATE A GT if power is cycled to the RT-Ex15. A typical display would be:
RATE A
PL – RATE A Pulse Length. The rate is calculated by the pulse length method based on
the SAMPLE A variable and displayed based on the corresponding KFR factor, decimal location
and engineering units. The gate time measurement RATE A
GT can be viewed by using the SEL
button or magnetic switch while in the RATE A PL display as illustrated below. The rate display
will revert back to RATE A PL if power is cycled to the RT-Ex15. A typical display would be: