Model T675 Delivery System Totalizer

Introduction

The Model T675 Delivery System is a thoroughly engineered electronic totalizing system that incorporates the latest technology and provides the most comprehensive features available to the industry. The T675 is designed to accurately compute and display in real time, pertinent flow parameters in both digital and graphic form. The displayed total of the product being delivered is continually corrected for the temperature of the product. Additional accuracy can be acquired by linearizing the turbine flowmeter input signal. The T675 math processor permits direct reading of product totals in any desired engineering unit i.e., pounds, gallons, liters, scf, etc.

This next generation system delivers the most sought after system enhancements while maintaining a user-friendly simplicity of operation. The Model T675 configuration settings can be reprogrammed in the field with relative ease. Programming the T675 is simply a matter of selecting the desired operating criteria from an all-inclusive menu thus eliminating the need to scroll through an entire flow chart to enter or change select data. Display of various flow properties such as temperature and flow limits, fluid density and equivalent volume is achieved automatically with the selection of product to be measured and turbine size.

Fault detection and identification has never been easier. In addition to standard alarm icons the T675 provides a “Detail Screen” that lists operating conditions such as supply voltage, internal battery voltage, signal input frequency, coil and RTD resistance, product and fluid temperature to name a few. Additionally, a System Alarm Log catalogs 16 events.

The T675 Maintenance program with ICON reminders can be customized to account for the varying operating conditions that exist between installations. This feature allows the end user to extract maximum real world service intervals without sacrificing effective maintenance.

System Overview

When introduced to flow the turbine flowmeter generates an AC sinewave signal within the pickup coil located directly above the turbine’s rotor. The signal of the pickup coil is amplified, divided, corrected and displayed by the T675. The displayed total is corrected for temperature by sensing the resistance of the RTD temperature probe. Delivery information, consisting of 17 selectable parameters, is transmitted via Bluetooth, the Infrared (I.R.) or RS232 communications port depending on which data collection device or printer is selected. This unique integrated system provides the end user a configurable, compact total delivery system.

Features

  • Easy to program, operate and understand.
  • 3x5 backlit full graphics display.
  • Dual microprocessors for real-time graphics, display of totals, temperature, pressure, flowrate and alarms.
  • Password protected configuration and calibration parameters.
  • Temperature Compensator supports 8 individual products, LOX, LIN, LAR, CO2, CCO2, LNG, LNO2, MAPP.
  • 'Softkeys' simplify display operation.
  • Selectable 2 – 10 point flowmeter linearization.
  • Automatic delivery system maintenance reminders based on a date and/or turbine hours of operation.
  • Audit trail documents Kfactor changes with date stamp, displaying the most current on the operating screen.
  • System alarm log simplifies fault identification.
  • Totalizer will withstand complete loss of power for 1 second, then save all operating data.
  • Restores to previous operating mode after power restoration.
  • Programmable Pump Control features protect the delivery system and increases service life.
  • Bluetooth, Infrared and RS-232 communication ports.
  • IR interface with Models SP824, SP834 Portable Printers.
  • Easily compatible with other printers.

Theory of Operation

The SI turbine flowmeter is a volumetric measurement device that measures fluid velocity with one moving component, the rotor. The momentum of the flowing fluid engages the low mass rotor resulting in the rotor rotating at an angular velocity that is proportional to the fluid velocity. The rotor’s rotation generates an AC sinewave signal in the pickup coil. SCI turbine flowmeters are linear devices therefore the signal output frequency is proportional to the flowrate within the designed flow range. Another benefit of a linear turbine meter is it’s Kfactor, the number of pulses generated per unit volume (gallons, pounds etc.) is consistent over the entire flow range. The total number of pulses generated is directly related to the total volume. The displayed total in the desired engineering unit is acquired by dividing the total pulses by the Kfactor. Because volumetric flowmeters and product density are influenced by fluid temperature, temperature must be measured and calculated into the final summation for the displayed total to be exact. A temperature compensation algorithm accomplishes this by computing the fluid density for the measured temperature and adjusts the volumetric or mass delivery total.

Simply stated, temperature compensation adds pulses to the pulse total when the detected temperature is colder than the products reference temperature and subtracts pulses when the product temperature is warmer than the reference temperature. The rate at which the pulses are added or subtracted is determined by the measured temperature departure from the products reference temperature.