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TRANSMITTER ZERO OFFSET - MANUAL/ AUTO ZERO FUNCTION
The K1600 is designed to accomodate tank transmitters with either a direct 4-20 ma
output or a pneumatic pressure output transduced with the KIO Pneumatic Interface to a 4-20
milliamp signal.
The K1600 utilizes a "live" zero to provide an easy means of adjusting the inventory
display for transmitter zero shift both above and below 4.00 ma. The transmitter
Zero Offset
represents the
A
nalog
to
D
igital count conversion by the
AtoD input card which corresponds to
the transmitter output when the product level in a tank falls below the transmitter. Typically
the zero setting for a transmitter equals 4.00 ma with a corresponding Zero Offset AtoD value of
approximately 50 counts. The Zero Offset value for a particular tank can be viewed by
pressing the
<TIME/ZERO>
button when in the Single-tank display mode and verified by
comparing it to the actual AtoD
count currently being converted from the level sensor when the
tank is empty. Both ATOD values should be identical. If they are not, corrections can be
programmed directly to the zero offset at the K1600 without physically adjusting the tank
sensor. This is refered to as the
Manual Zero Function
.
Shifts in P/I transmitter zeros with pneumatic sensors, when used in conjunction with the
KIO-12 or KIO-16 pneumatic input enclosure, are automatically monitored and compensated for by the
K1600 on a preprogrammed time interval and therefore cannot be mannually programmed. This is refered
to as the
Auto-Zero Function
.
