- Official UK and Ireland channel partner
- UK technical support available
- Model selection and configuration support
Dwyer GFT2 Flow Totalizers
Display instantaneous flow rate, total and accumulated total from compatible analogue flow meters and controllers.
Key highlights
- Totalisation: Flow rate, total and accumulated total
- Inputs: 0-5 VDC, 0-10 VDC or 4-20 mA
- Engineering units: Up to 47 volumetric and mass-flow units
- Communications: RS-232 or RS-485 by model
- Alarms: Programmable high and low flow events
The Dwyer Series GFT2 is a flow totaliser and secondary display for compatible analogue flow meters and controllers. It processes the connected instrument’s signal to show instantaneous flow rate, total and accumulated total on a local graphic LCD.
The GFT2 does not contain the primary flow sensor. Its accuracy and displayed values therefore depend on correct signal matching, full-scale configuration, engineering units and the performance of the connected meter or controller.
Input signal and serial interface are selected together. Documented models accept 0-5 VDC, 0-10 VDC or 4-20 mA and provide either RS-232 or RS-485 communications. Up to 47 volumetric and mass-flow units, including a user-defined option, support varied flow systems.
For compatible flow-controller systems, the GFT2 can also provide a setpoint signal and programmed setpoint operation. Two programmable optically isolated outputs can signal selected events or provide pulse output, while high- and low-flow alarms support monitoring.
Compact mounting options suit instrument-mounted, panel, wall and field installations. Typical uses include gas or liquid consumption monitoring, laboratory and test systems, process skids, OEM equipment and supervisory data integration, subject to the connected instrument and interface compatibility.
Key Features
- Rate and total display: Graphic LCD presents instantaneous flow, total and accumulated total values
- Signal linearisation: Microcontroller processing supports curve linearisation and configuration to the connected instrument
- Flexible units: Select from up to 47 volumetric and mass-flow engineering units, including a user-defined option
- Alarm functions: Programmable high- and low-flow alarms include adjustable action-delay settings
- Programmable outputs: Two optically isolated channels can indicate assigned events or operate as pulse outputs
- Controller setpoint support: Configurable analogue output can command a compatible external flow controller
- Serial integration: Choose RS-232 or RS-485 communications to suit the host system
Specifications
| Function, Display and Processing | |
| Function | Secondary display, totaliser and signal-processing unit for compatible analogue flow meters and controllers; does not include a flow sensor |
| Displayed values | Instantaneous flow rate, total and accumulated total |
| Display | Graphic LCD with adjustable backlight and contrast; 13 mm digits for flow rate and 5.5 mm digits for total |
| Engineering units | Up to 47 volumetric and mass-flow units, including a user-defined option |
| Signal processing | Microcontroller-based scaling and flow-curve linearisation |
| Accuracy | ±0.1% of full scale for the GFT2; overall system accuracy also depends on the connected instrument, calibration and correct configuration |
| Input and Model Selection | |
| Compatible input signals | 0-5 VDC, 0-10 VDC or 4-20 mA analogue flow signal |
| 0-5 VDC models | GFT2-05-RS232 or GFT2-05-RS485 |
| 0-10 VDC models | GFT2-10-RS232 or GFT2-10-RS485 |
| 4-20 mA models | GFT2-15-RS232 or GFT2-15-RS485 |
| 4-20 mA input | Passive, non-isolated current input with 249 ohm resistance; maximum input 25 mA |
| Compatibility basis | Match the connected instrument’s signal type, full-scale value, engineering units, scaling and cable arrangement |
| Outputs and Communications | |
| Serial interfaces | RS-232 or RS-485, selected by model |
| RS-485 arrangement | Two-wire, half-duplex multidrop; manual documents up to 64 devices on one segment and cable length up to 2000 ft (approximately 610 m) |
| Analogue setpoint output | Configurable 0-5 VDC, 0-10 VDC or 4-20 mA output for a compatible external flow controller; used only when the GFT2 is configured for controller operation |
| Setpoint-output load | 0-5 VDC: 1000 ohm maximum; 0-10 VDC: 5000 ohm maximum; 4-20 mA: 900 ohm maximum, self-powered and non-isolated |
| Digital and pulse outputs | Two programmable optically isolated passive outputs, assignable to system events or pulse operation; external DC excitation required |
| Digital-output limits | External voltage greater than 2 V and less than 40 V; current greater than 0.2 mA and less than 150 mA |
| Flow alarms | Programmable high and low alarms with adjustable action delay and output-event assignment |
| Power, Mounting and Operating Conditions | |
| Power input | 12-26 VDC; do not exceed 28 VDC |
| Operating temperature | -10 to 70°C (14 to 158°F) |
| Nominal dimensions | 86.36 mm high x 76.2 mm wide x 18.8 mm deep (3-13/32 x 3 x 47/64 in) |
| Weight | 125 g (0.3 lb) |
| Mounting arrangements | Instrument, panel, wall or field mounting |
| Electrical connections | 9-pin female D connector for power, analogue and serial signals; separate four-position terminal for optically isolated outputs. Follow the current model manual and verified cable wiring |
Scope of Delivery
- Series GFT2 flow totalizer
- Mounting bracket with four screws
- DwyerOmega configuration utility and operating documentation
Support
Able Instruments are an official UK and Ireland channel partner for DwyerOmega, providing application advice, configuration support and quotation assistance for the Series GFT2 family.
- Model selection: Support matching the analogue input, serial interface, connected instrument and mounting arrangement
- Option compatibility: Checks for scaling, engineering units, alarms, pulse outputs, setpoint output, cables and software
- Installation support: Advice on power, signal wiring, mounting, RS-232 or RS-485 integration and controller connections
- Documentation support: Help with the datasheet, operating manual, configuration utility and relevant connection records
Accessories
- A-645 flow controller mounting kit, without cables
- A-646 flow meter mounting kit, without cables
- GFT2-20C flow controller mounting kit with power supply