Liquid Controls T350N-P - Manual (Page 13)

Sponsler, Inc. T350N-P Truck Totalizer/Printer pg. 13 Doc# MN-T350N-P
TEMPERATURE COMPENSATION (RLC131 option)
As product flows through the pipeline, a turbine located in the product spins and
electrical pulses are generated and sent to the totalizer. The number and
frequency of these pulses corresponds to the amount of product flow and the
flow rate.
As the product I the pipeline heats or cools, the density and volume of the
product changes. When the volume of product changes, the turbine spins faster
or slower since the turbine flowmeter is a volumetric measuring device, even
though the AMOUNT (measured by weight) of product is not changed.
Temperature compensation operates by reading the temperature of the product
and adding or subtracting pulses based on the temperature and hence the
density of the product.
As long as the product flowing past the temperature sensor is within range of the
product, the temperature compensation module will automatically correct for the
density of the product. If the product is not within the correct temperature range,
or an electrical problem exists with the temperature probe, the compensation
module will not compensate for the product and will simply operate on 1 1:1 basis
without compensation.
Whenever the temperature goes out of range for the selected product, the
ALARM LED will illuminate. If the relay option is installed, and external relay will
be energized whenever the alarm condition exists. If jumper JU2 is installed on
the RLC131 compensation board the totalizer will stop accepting incoming
pulses. Any pulses in storage will be outputted since these pulses were
accepted while the unit was not in alarm condition.
An additional feature exists if the operator wishes to turn off temperature
compensation even if the RLC131 Compensation Module is installed. To turn off
temperature compensation install JU4 on the RLC131 module. When installed,
no temperature compensation exists and in place of the product temperature on
line 1 of the LCD is the message ‘NO TC’.