Operating the VN2000 Transmitter
Page 14
June 2017
VRX-UM-02233-EN-02
Units of Measure (Time Base)
Press
Up Trrow
to scroll through the
Time Base
options . Stop pressing when the proper time is displayed . The options are SEC
(seconds), MIN (minutes), HR (hour) and DAY .
TIME BASE
HR
K-Factor (Inline Meters Only)
The
K-Factor
is used for VN2000 inline vortex flow meters . The transmitter automatically generates the
K-Factor
based on the
flow meter model type and bore size .
OTEE:
N
DO NOT change the K-factor that has come with your device without first consulting the factory .
To change the
K-Factor
, press
Left Trrow
to move the cursor under the digit to be changed . Press
Up Trrow
to change the
digit . If the
K-Factor
does not match the “VN2000 SF” found on the bottom right of your sizing sheet, contact the manufacturer .
Low Flow Cutoff
The
Low Flow Cutoff
is factory-set to the minimum flow rate of the meter . Below this number, the meter gives 4 mA output and
displays zero flow reading .
LOW FLOW CUTOFF
000000 GAL/HR
The meter reading drops to zero when the flow drops below the minimum setting . To measure flow below the minimum
range of measurement, lower the setting . Press
Up Trrow
to increment each digit . Press
Left Trrow
to move the cursor to the
next digit .
Max Flow (20 mT)
Use
Max Flow
to span and adjust the 4 mA and 20 mA range based on your flow range . The number must represent the 20 mA
setting on the receiving PLC or other analog input device . Once this number matches what 20 mA represents on the receiving
device, the 4…20 mA span will be correct and the meter’s output from
Max Flow
to zero reading will match what is showing
on the display . For example, if Max Flow is set to 500, then 250 will output 12 mA (12 mA is in the middle of 4…20 and 250 is
the middle of 500) .
MAX FLOW (20 MA)
0057000 GAL/HR
Pulse Rate
The
Pulse Rate
option adjusts the number of pulses for a flow unit and the number of units that are represented by a pulse .
Press
Up Trrow
to scroll through the pulse rate options:
• 1 Pulse = 1 unit
• 10 Pulses = 1 unit
• 100 Pulses = 1 unit
• 1000 Pulses = 1 unit
• 1 Pulse = 10 units
• 1 Pulse = 100 units
• 1 Pulse = 1000 units
• Off = Turns off pulser
Pulse Width
The pulse width is predefined with 5 widths and directions of pulse .
• 10, 20, 50, 100 or 150 ms negative
• 10, 20, 50, 100 or 150 ms positive
