Badger Meter B3000 - Manual (Page 25)

Programming Manual
Page 25 March 2014
Unit Under Test (UUT) Calibration Data Table In GPM
Actual
GPM
UUT
Frequency
UUT Actual
K factor
(Hz x 60)
Nominal K
Linear
Coefficient
Raw Error
Hz Counts/Gallon GPM % Rate
50 02 755 900 906 72 49 72 1 0060 0 59
28 12 426 000 908 96 28 02 1 0035 0 35
15 80 240 500 913 29 15 82 0 9987 -0 13
8 88 135 800 917 57 8 93 0 9941 -0 59
4 95 75 100 910 30 4 94 1 0020 0 20
Nominal K (NK) 912 144
Table 2: Sample linearization data
In this example the linear coefficient has already been calculated by the calibration program so all that is required is to enter 5
into the number of linear points Lin Pts parameter and then enter, in order, the five frequency, linear coefficient data pairs
Modbus Modbus
Extended Function
The Modbus output parameter can be either enabled or disabled When enabled, this output allows communications with the
B3000 using the Modbus RTU protocol For additional information see MODBUS INTERFACE on page 45
At the Modbus prompt, press ENTER The current state of the Modbus output is shown If the current state is correct, press
ENTER to advance to the next parameter
If the current state requires a change, use either
▲ or ► to toggle between state When the proper state has been selected
press ENTER
Bus Address BusAddr
If the Modbus output is enabled a valid Modbus address must also be chosen Every device communicating over the RS485
communications bus using the Modbus protocol must have a unique bus address Address values range from 0…127 with 0
being the default
At the BusAddr prompt, press ENTER The current setting begins to flash If the current setting is correct, press ENTER to
advance to the next parameter
If the current setting requires a change, use
▲ to increment the display digit until it matches the first digit of the required bus
address Next press ► to advance to the next digit and using ▲ to increment the second digit until it matches the second
digit of the required address Repeat this step for the third digit of the address and then press ENTER to save the new address
and advance to the next parameter
Set Points
Set points allow the meter to signal when a specific flow condition has been achieved They are commonly used to indicate
high or low flow conditions that need to be attended to The B3000 has two open collector outputs controlled by the set
point function
The set point transistors have the same current limitations and setup requirements as the totalizing pulse output transistors
described previously (see Figure 23 and Figure 24 )
Both set point one and set point two are configured using the same procedures but the hysteresis and tripping conditions are
independently set for each set point output
OTE: N In most instances the current capacity of an open collector transistor is not sufficient to operate old style counters
that relied on relay contact closures When used with basic counting circuits a solid state relay is likely to be needed