Hardy HI 2204LT Weight Transmitter - Manual (Page 6)

HI 2201LT/HI 2204LT
2
HI 2204LT (14 VDC) to that of each receiving device
(loop resistance x 20 ma).
The Level Indicator applies power to each transducer
in pulses a few milliseconds long at a rate of 90 pulses
per second. The Level Indicator measures the voltage
across the output terminals of the transducer with
each power pulse, and it converts the average into a
smooth current that varies with the transducer signal.
This method of powering the transducer allows the
Level Indicator to power up to four load cells. Though
each load cell requires more than 4 ma excitation, the
Level Indicator itself draws no more than 4 ma aver-
age current at zero weight load, and no more than 20
ma average current at full scale.
The Level Indicator is potted and sealed to withstand
typical industrial environments. It is small enough to
be mounted on a load cell summing board inside of a
standard 5” x 7” x 3.5” NEMA 4 enclosure.
Specifications
Physical
Dimensions Length: 4.50 Inches (114.3 mm)
Width: 2.15 Inches (54.6 mm)
Height: 1.30 Inches 33.02 mm)
Weight: 8 oz. (.227 Kgs)
Power
Requirement Minimum: 15 VDC
Maximum: 50 VDC
Zero Scale: 4 ma
Full Scale: 20 ma
Load Cell
Excitation 5 V (pulsed), 90 hz
Zero Offset Range Coarse: 2 mV/V
fine: 0.04 mV/V
Sensitivity 3 mV/V (Continuously Adjustable from 2 mV/V to 3
mV/V)
Linearity 0.11% of full scale*
* Some barrier protection is required where the 2201
is located in a hazardous area.