Hardy HI 2204LT Weight Transmitter - Manual (Page 8)

HI 2201LT/HI 2204LT
4
FIG. 1 HI 2201LT/HI 2204 (-A3 OR -A5) IN
NEMA 4 JUNCTION BOX/TOP VIEW
The HI 2201/2204LT-A3 and HI 2201/2204LT-A5
Loop Powered Level Weight Transmitter comes
mounted on a load cell summing board within a
NEMA 4 junction box. The load cell summing board
is designed to allow balancing pots to be installed if
required. (See Fig. 2)
FIG. 2 TRANSMITTER INSTALLED ON LOAD
CELL SUMMING BOARD (-A3 OR -A5
OPTION)
Input - Strain Gage
Transducer Strain Gage signals are typically very low in voltage
causing them to be susceptible to noise. It is a good
practice to isolate strain gage signals from high volt-
age (110 VAC) lines. It is highly recommended that
the transducer signal wire be routed in its own con-
duit. The transducer cable should have a shield which
can be earth grounded near the transmitter.
Output/Power
Loop The loop power connection provides power to the HI
2201LT/HI 2204LT and provides the 4-20 mA signal.
The transmitter must have from 15 VDC to 50 VDC
across its LOOP terminals at up to 20 mA (full scale
output). since all devices in the output/power loop are
in series minimum power supply voltage, at 20 mA,
must equal the total voltage drop across all of the
other devices in the loop, plus 15 VDC for the HI
2201LT.