FW_F126PEGTP_v1901_04_EN.docx
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1.
INTRODUCTION
1.1.
SYSTEM DESCRIPTION
Functions and features
The flow computer model F126-P-EG-TP is a microprocessor driven instrument for the calculation of
standard volumetric flow or mass flow for gas applications using flow equations.
This product has been designed with a focus on:
▪
ultra-low power consumption to allow long-life battery powered applications (type PB/PC),
▪
intrinsic safety for use in hazardous applications (type XI);
▪
several mounting possibilities with aluminum or GRP enclosures for harsh industrial surroundings;
▪
ability to process all types of flowmeter signals;
▪
transmitting possibilities with analog / pulse and communication outputs.
Flowmeter and temperature input
This manual describes the unit with a pulse input from the flowmeter. The F126-P has also a PT100
temperature input. Other versions are available to process (0)4-20mA signals.
One flowmeter with a passive or active pulse, Namur or sine wave (coil) signal output can be
connected to the F126-P. To power the sensor, several options are available.
Standard output
▪
Pulse output to transmit a pulse that represents a totalized quantity as programmed.
▪
Linear (0)4-20mA or 0-10V analog output to represent the actual flow rate as programmed. The
(0)4-20mA or 0-10V signal limits can be tuned.
Fig. 1: Typical application
Configuration of the unit
The F126-P is designed for use in many types of applications. For that reason, a setup menu is
available to program the F126-P according to your specific requirements.
The setup includes several important features, such as K-Factors, engineering units, signal
selection, power management (to extend battery life-time), etc. All settings are stored in a non-
volatile memory and therefore kept in the event of a power failure or an exhausted battery.
Display information
The unit has a LCD with (optional) backlight to show the process information, status and alarm messages.
The display refresh rate is programmed in the setup menu.
At a key press, the display refresh rate will
switch to FAST for 30 seconds. When 'OFF' is selected, the display goes off after 30 seconds after
the last key press. The display temporarily comes on after a key press.
A backup of the total and accumulated total in EEPROM memory is made every minute.
Options
The following options are available: isolated or active (0)4-20mA / 0-10V analog output, full Modbus
communication RS232/485/TTL (also battery powered), intrinsic safety, mechanical relay or active
output, power- and sensor-supply options, extended measurement range for PT100, panel -mount,
wall-mount and weather-proof enclosures, flame proof enclosure and LED backlight.
