Liquid Controls T575N - Manual (Page 2)

Sponsler, Inc. Model T575N Temperature Compensated Totalizer/Printer
GENERAL
The Model T575N is a highly sophisticated electronic temperature compensated flow totalization system
specifically designed to handle the harsh conditions associated with liquid transports. Totalization is displayed via
a motor driven Veeder-Root Meter Register. Individual delivery data is displayed on eight 1/8” high figures. A
Veeder-Root zero start meter printer mechanically prints the amount of the delivery on a 4 1/8” x 7 3/4” universal
meter ticket. Reset and print operations are manually actuated.
The input from a SPONSLER PRECISION TURBINE FLOWMETER or similar device is amplified, factored,
divided, temperature compensated, adjusted for the gearplate used and output through a motor driven circuit via a
SINGLE electronic circuit board. The Model T575N factoring/temperature compensation electronic module
accommodates the temperature compensation curves of up to eight different products; field selectable via a rotary
switch. The RTD temperature sensor is linearized automatically. Calibration of the Model T575N to provide
totalization in any engineering unit (gallons, liters, lbs., kg, etc.) is accomplished via four BCD factoring switches
and one BCD divider switch.
THEORY OF OPERATION
As product flows through a turbine flowmeter, rotor blades inside the flowmeter rotate through the magnetic field of
the magnetic pickup coil generating electrical pulses through the pickup coil. The number and frequency of these
pulses correspond to the amount of product and the flow rate respectively.
The Model T575N Totalizer conditions these low amplitude pulses from the pick up coil. The amplified pulses are
then factored, divided and, if equipped, temperature compensated. Factoring permits the displayed quantity to be
in any engineering unit desired. The flowmeter calibration factor that converts electronic pulses to gallons,
pounds, liters, etc., is field adjustable. The overall factored pulses are translated to motor steps that drive the
Veeder-Root register. The Veeder-Root register displays a running account, final total, and accumulated total of
the product delivery. The meter register drives the zero start Veeder-Root printer which mechanically records and
prints digital information. The zero start meter printer begins the count at zero and returns to zero when reset.
The printer total is the amount of the delivery. Print and reset operations are manually activated.
Turbine flowmeters are volumetric devices; requiring a means to COMPENSATE for temperature related physical
changes of the product. As the product warms and cools, the density, as well as volume, changes while the
MASS remains constant. The Model T575N determines the product temperature via an RTD temperature probe
located in the delivery line and compensates for the corresponding temperature. As long as the product is within
the normal delivery temperature range of the product and there is no sensor failure, the Model T575N will
automatically correct for the density of the product. If the product temperature is not within the specified range or a
problem exists with the probe, the Model T575N will stop compensating and only factor the product. Whenever
the indicated temperature is not within the specified range, whether from a problem with the probe or a problem
with on-board circuitry, the COMPENSATED LED located on the front of the unit will flash indicating NO
COMPENSATION and the ALARM LED on the circuit board will illuminate. If jumper ‘A’ is installed the unit will
not totalize when an alarm condition exists.
INPUT/OUTPUT MAXIMUM FREQUENCY
This unit is designed to operate with input frequencies up to 2000 Hz. When driving a Veeder-Root register, the
maximum output frequency after factoring and temperature compensation is 180 steps per second with 1:2
gearplate installed (maximum count per minute is 1080) and 150 steps per second with 1:3 gearplate installed
(maximum count per minute is 1351). Any attempt to output at a faster rate will cause pulses to go into storage.
Up to 30,000 pulses can be put into storage. Stored pulses will be output at the maximum rate.
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