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mA
Unit
1
Hookup Wiring for a Single 4-20
3-
“D”
connector through the load (1000 Ohms maxi-
mum) to ground (see Section 2.6, Electrical Connections).
Figure 3-l illustrates an installation with a current loop output.
Figure
output
pin on the
mA
mAoutput
signal current flows from the 4-20
mA Output Signal
The 4-20
3.4
The 4-20
hii
level, above the full scale range. After the overrange
condition has been removed, it may take several minutes for
the FMA-1900 to recover and resume normal operation. An
overrange condition will not harm the instrument.
andlor
output
going to a
by
the display
Overrange
conditions are indicated
“1’
will appear on the
display.
mA
outputs can exceed full scale by as much as 50%
or more. On the digital display, the display cannot exceed the
four digits 1999. If the flow rate exceeds 1999, the right-most
digits will blank and only the left-hand
FMA-
1900 data tag, the output signal and digital display will read a
higher value. The FMA-1900 has not been calibrated for
overranged flows and will be both non-linear and inaccurate if
an overrange condition exists. The O-5 VDC (O-l 0 optional)
and 4-20
3.3
Overranging
If the flow rate exceeds the full scale range listed on the