Liquid Controls Sponsler T675 - Cryogenic System Register - Manual (Page 6)

Sponsler, Inc. Model T675 Flow Totalizer Features Overview Pg. 3
2.3 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.
2.4 THEORY OF OPERATION
The S.I. 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. S.I.
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 its 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.
2.5 CONTROL PANEL INDICATORS
POWER INDICATOR: A Green LED illuminates when the T675 is “On” and is extinguished when the T675 is “Off”.
SIGNAL INDICATOR: An Amber LED flashes when an input signal is present.
SYSTEM ALARM INDICATOR: A Red LED flashes indicating the presence of an Alarm or Maintenance condition.
BLUETOOTH INDICATOR: A purple LED flashes when searching for a connection and is on steady when connected.
2.6 CONTROL PANEL PUSHBUTTONS
ON/OFF PUSHBUTTON: Momentarily depressing the On/Off pushbutton will turn the T675 system “On” illuminating the
green LED. The system resumes operation exactly as existed at the moment of the last power “Off”. In order to turn the
T675 “Off” during normal operation you must depress and hold the On/Off pushbutton for 3 seconds before the system will
turn “Off”. During the brief delay the Green Power LED will flash as a warning indicator. Once the display backlight
extinguishes the On/Off pushbutton can be released.
As a safeguard, during some critical operations such as system setup, the On/Off pushbutton is disabled. This allows the
operator to complete the setup operation (or exit setup first via the Reset/Esc key). Either way changes will be saved
before the system powers “Off”.
KEYPAD: A 16 pushbutton keypad, 10 numeric, decimal point, backspace key ( ) and 4 special function keys, used for
data entry during setup of the T675. During normal operation (Operating mode) the keypad is disabled with the exception
of the Setup key.
SETUP: Changes the T675 from the Operating to the Prove mode.
RESET (ESC): Enables escape function, will initiate system reset only in Programming mode when “double
clicked”