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Programming Manual
Page 23 March 2014
Flow at 20 mA Fl=20mA
Basic Function
When the display is operated using loop power, the flow rate that corresponds to 20 mA must be set. This setting normally
represents the maximum rate of the flow sensor connected to the display but other entries are possible.
At the Fl=20mA prompt, press ENTER. The current setting will begin 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 maximum flow value. Next press
► to advance to the next digit and using ▲ to increment the
second display digit until it matches the second digit of the
required value. Repeat this step until the maximum flow at 20
mA is entered. Press ENTER to save the new flow value.
4-20 mA Calibration 4-20Cal
Extended Function
This menu item allows the fine adjustment of the Digital to
Analog Converter (DAC) that controls 4-20 mA output. The
4-20 mA output is calibrated at the factory and under most
circumstances does not need to be adjusted. If the output needs
to be adjusted for any reason the 4-20 mA calibration procedure
is used.
The DAC used in the B3000 is an twelve bit device so the valid
entries range from 0…4095.
4 mA Adjustment 4mA Out
To set the 4 mA value, connect an ammeter in series with the loop
power supply as shown in Figure 23. At the 4-20Cal prompt, press ENTER.
The display will now show a steady NO indication. Press ▲ to change to
a YES display and press ENTER. The 4 mA DAC setting is typically between
35…50. Using ▲ and ► while monitoring the ammeter, adjust the 4 mA value
to obtain a 4 mA reading on the ammeter. The ▲ increases the DAC value
and ► decreases the DAC value. When a steady 4 mA reading is obtained on
the ammeter, press ENTER to lock in this value and move to the 20 mA adjustment.
Figure 23: 4-20 mA calibration setup
20 mA Adjustment 20mAOut
The 20 mA adjustment is performed using the same procedure as the 4 mA adjustment. While monitoring the ammeter,
adjust the 20 mA DAC value to obtain a 20 mA reading. The ▲ increases the DAC value and ► decreases the DAC value.
When a steady 20 mA reading is obtained on the ammeter, press ENTER to lock in this value and move to the next parameter.
4-20 mA Test 4-20Tst
The B3000 monitor contains a diagnostic routine that allows the simulation of mA output values between 4…20 to check
output tracking. At the 4-20 TEST prompt the current is shown as a flashing number. Use ▲ to increase the simulated mA
output in increments of 1 mA. The ► decreases the mA output. The ammeter should track the simulated mA output. If a
4-20 mA test is not necessary, press ENTER to move to the next parameter.
OTE:N Pressing ENTER when the monitor is in test mode will exit the test mode and move on to the next
programming parameter.