Badger Meter Registers - Manual (Page 18)

Industrial Registers, Models ER-420-AC, ER-420-DC & ER-420-LP
6 – ANALOG OUTPUT
A linear analog 4-20 mA signal is generated according to the Flow Rate with a 10 bits resolution The settings for Flow Rate (SETUP 2)
influence the analog output directly The relationship between rate and analog output is set with the following functions:
DISABLE / ENABLE
61
The analog output can be disabled When disabled, a 3 5 mA will be generated if a power supply is available
MINIMUM FLOW RATE
62 Enter here the flow rate at which the output should generate the minimum signal (4 mA)—in most
applications, at flow rate "zero" The number of decimals displayed depends upon SETUP 23 The time and
measuring units (L/min for example) are dependant upon SETUP 21 and 22 but are not displayed
MAXIMUM FLOW RATE
63 Enter here the flow rate at which the output should generate the maximum signal (20 mA)—in most
applications at maximum flow The number of decimals displayed depends upon SETUP 23 The time and
measuring units (L/min for example) are dependant upon SETUP 21 and 22 but cannot be displayed
CUT-OFF
64 To ignore leakage of the flow for example, a low flow cut-off can be set as a percentage of the full range of 16
mA When the flow is less than the required rate, the current will be the minimum signal (4 mA)
Examples:
4 mA
(SETUP 62)
20 mA
(SETUP 63)
CUTOFF
(SETUP 64)
REQUIRED RATE OUTPUT
0 gpm 100 gpm 2% (100-0)*2% = 2 0 gpm 4+(16*2%) = 4 32 mA
20 gpm 800 gpm 3 5%
(800-20)*3 5%= 27 3
gpm
4+(16*3 5%) = 4 56 mA
TUNE MIN / 4 mA
65 The initial minimum analog output value is 4 mA However, this value might differ slightly due to external
influences such as temperature The 4 mA value can be tuned precisely with this setting
BEFORE TUNING THE SIGNAL, BE SURE THAT THE ANALOG SIGNAL IS NOT BEING USED FOR ANY
APPLICATION!
After pressing PROG, the current will be about 4 mA The current can be increased / decreased with the
arrow-keys and is directly active Press ENTER to store the new value
The analog output value can be programmed “upside-down” if desired, so 20 mA at minimum flow rate for
example!
TUNE MAX / 20 mA
66 The initial maximum analog output value is 20 mA However, this value might differ slightly due to external
influences such as temperature for example The 20 mA value can be tuned precisely with this setting
BEFORE TUNING THE SIGNAL, BE SURE THAT THE ANALOG SIGNAL IS NOT BEING USED FOR ANY
APPLICATION!
After pressing PROG, the current will be about 20 mA The current can be increased or decreased with the
arrow keys and is directly active Press ENTER to store the new value
The analog output value can be programmed “upside-down” if desired, so 4 mA at maximum flow rate for
example!
Page 18 May 2014