Dwyer GFM4 Series Gas Mass Flow Meter and Controller is an ideal choice for the measurement of flow rates of a wide variety of gases. This multi-parameter flow meter supports various functions such as flow totalizer, flow, temperature, and pressure alarms, and is available in a choice of 0 to 5VDC, 0 to 10VDC, or 4 to 20 mA output signals. Dwyer Controller with Standard LCD and four-button keypad allows easy access to the many features of the GFM4.
Dwyer Mass Flow Meter with Digital interface operates through available RS-485 or RS-232, providing access to internal data parameters and multi-drop capability of up to 255 units (RS-485 only). Set alarms remotely via digital interface for flow, pressure, and temperature to alert user of high or low thresholds being exceeded.
With a high ±1% FS accuracy and ±0.25% FS repeatability, the GFM4 is the optimal choice in gas flow metering and monitoring. The GFM4 comes with a NIST traceable certificate. Pressure, temperature and flow monitoring.
Dwyer GFM4 Series Features
- Multi-drop capability of up to 256 units (for RS-485 option).
- Programmable 12 digit totalizer indicates total gas volume.
- Flow alarm limits for high and low gas flow with relay output.
- Pressure alarm limits for high and low gas pressure with relay output.
- Four button keypad and large 128×64 graphical LCD with backlight.
- Internal conversion factors for up to 32 gases.
- Automatic zero adjustment.
- Self diagnostic tests.
- Free communication software available at www.dwyer-inst.com.
- NIST traceable certificate included.
Application
- Gas flow measurement
- Gas flow control
- Operating pumps and valves
- Process equipment
- Vacuum processes
- Glass and metal coating
- Film deposition
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Dwyer GFM4 Series Specification
| Service | Clean gases compatible with wetted parts. |
| Wetted Materials | 316 SS, 416 SS; Fluoroelastomer, Buna-N, EPR or PTFE O-rings. |
| Accuracy | ±1% FS. |
| Repeatability | ±0.25% FS. |
| Response Time | 0.6 to 1.0 s to within ±2% of setpoint over 20 to 100% FS. |
| Output Signal | Linear 0 to 5 VDC (3000 Ω min. load impedance); 0 to 10 VDC (6000 Ω min. load impedance); 4 to 20 mA (500 Ω max loop resistance). |
| Relay Rating | 1 amp @ 24 VDC. |
| Max Particulate Size | 5 microns. |
| Temperature Limits | Ambient: 32 to 122°F (0 to 50°C); Dry Gases: 14 to 122°F (-10 to 50°C). |
| Power Supply | 12 VDC; ±15 VDC; 24 VDC. |
| Process Connections | 1/8″ compression fitting for flow rates ≤ 10 L/min; 1/4″ for ≤ 50 L/min; 3/8″ for ≤ 100 L/min. Pressure Limits: 200 psia (13.79 barA). |
| Leak Integrity | 1 x 10-9 smL/sec of helium. |
| Display | 128 x 64 graphic LCD with backlight. |
| Weight | 1 lb (.45 kg). |
Download Data Sheet: Series GFM4 Gas Mass Flow Meter and Controller
Ref: dwyer-inst.com