AW Gear Meters LLC-E-BA - Manual (Page 15)

AW-Lake Company 8809 Industrial Drive, Franksville, WI 53126  web: www.aw-lake.com
 Tel: 262-884-9800  Fax: 262-884-9810  Email: [email protected]
REV. 1.3 LLC-E-BA Manual rev 3.3.10.DOC
15
GateTIME - This variable sets the sampling time for display of the incoming frequency. This variable
is programmed in complete seconds and the allowable range is from 1 to 30 seconds. This variable
will only effect the update of the display and is useful in stabilizing the display when dealing with
variations in flow. In low rate situations (below 10Hz.) the LLC converts automatically to pulse
width measurement to increase the accuracy of the display. The display will not function if this
variable is set to zero!
Factory default is 0000001 seconds
Use the (UP) or (DN)-key to increment or decrement the variable value. Press the (ENT)-key to store
the programmed value and advance to the next variable.
0-set mA
=s - This variable is used to set the lower range of the mA output and as a fine offset
adjustment for the output. The variable is programmed with two decimal places of accuracy. The
allowable range is 0.00mA. to 10.00mA.. This variable has been factory set to produce a measured
4.00mA. at the output but can be changed to suit the users application or for fine offset adjustment of
the output. This variable only adjusts the analog output and does not effect the display.
Factory default is 0000x.xx mA* *(typ. 3.9x to 4.0x)
Use the (UP) or (DN)-key to increment or decrement the variable value. Press the (ENT)-key to store
the programmed value and advance to the next variable.
KFR-factor - For the LLC to display in a desired engineering unit such as GPM, an appropriate
scaling factor must be programmed. This factor is the KFR factor. The KFR is calculated using the
K-factor of the transducer being monitored. The K-factor is the number of impulses per engineering
unit established by the transducer manufacturer or by a calibration test.
Factory default is 00100.00 (Displays Hertz w/ two decimal places)
To calculate the KFR factor use the following formula:
KFR= TIME BASE CONSTANT/K-FACTOR
Where:
- 100 is the time base constant for eng. units per second
- 6000 is the time base constant for eng. units per minute
- 360000 is the time base constant for eng. units per hour
- K-FACTOR is the average number of pulses per desired
eng. unit that the transducer produces.
Remove the insignificant decimals often produced with this calculation as they will result in
displays with a misleading level of precision far exceeding the accuracy of the meter. Use a
maximum of four digits regardless of decimal point position! Enter KFR without regard to the
location of the decimal point in the display. The desired decimal location is entered in the next
procedure. The largest acceptable number for KFR is 65535.