Chapter 4. Specifications
44 DigitalFlow™ GF868 Startup Guide (1 and 2-Channel)
4.2.5 Input/Output Specifications (cont.)
Totalizer/Frequency Output Options:
Select up to 3 Totalizer/Frequency Output Boards, each with four outputs per board, 10 kHz max.
All boards allow software-selectable functioning in two modes:
Totalizer Mode: one pulse per defined unit of parameter (e.g., 1 pulse/SCF).
Frequency Mode: 5-volt frequency proportional to magnitude of parameter (e.g., 10 Hz = 1 SCFM).
Alarm Options:
Select up to 2 boards of one of the following types:
Standard Relay Board with three non-hermetic Form-C relays.
Hermetic Relay Board with three hermetically sealed Form-C relays.
4.3 Operational Specifications
4.3.1 Flow Computer (Built-in)
Programmable from the keypad. Calculates velocity, instantaneous average molecular weight, mass flow rate, and
other flow parameters in real time, while simultaneously handling other activities such as programming, logging,
calibration, and output of data and diagnostics.
New and improved MW algorithm, now based on temperature and pressure correction of sound speed. Gives wider
range, higher accuracy, and improved compensation for non-hydrocarbon gases such as CO
2
, H
2
, N
2
, and CO.
4.3.2 Data Logging
Keypad-programmable for setting up log units, update interval, start and stop times. Memory capacity for more than
43,000 data points in a linear or circular log for standard and error logs.
4.3.3 Display Functions
Graphic display shows flow in numeric or graphic format. Also displays logged data and diagnostics.
4.3.4 Printer Signal Output
Supports wide variety of thermal and impact printers. Output data in numeric or graphic (“strip chart”) format.
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