Badger Meter Vortex Meters - Manual (Page 10)

8 Form No. 09-VRX-UM-00007
The frequency output option generates a square wave with an amplitude that matches the input power
level. The pulse width varies with frequency and is found by using the following formula. The result is in
seconds.
PW =
1
2 x Maximum Frequency (Hz)
K-FACTORS
The K-factor (with regards to flow) is the number of pulses that must be accumulated to equal a particu-
lar volume of fluid. Think of each pulse as representing a small fraction of the totalizing unit.
Calibration reports that accompany RVL series meters include a nominal K-factor in both gallons and
liters. See the sample calibration sheet in the appendix of this manual.
ELECTRICAL INSTALLATION
POWER
The meter requires an 8 to 28 VDC power supply. The specific connections depend upon which output is
option is used. See wiring details for the specific output option .
NOTE: This instrument requires clean electrical line power. Do not operate this unit on circuits with noisy components (i.e.
Fluorescent lights, relays, compressors, variable frequency drives, etc.) Linear power supplies are also much preferable
to switching power supplies.
NOTE: The power and output connections share a common ground.
WIRING
4-20 mA LOOP
Connect a twisted pair wire (not provided) to the terminals of the transmitter marked +8-28 VDC and
Output. If the twisted pair wire is shielded, do not connect the shield to the transmitter. The shield should
be grounded at the receiver only (see figure 6)
. The transmitter is reverse-polarity protected.