Dwyer gas mass flowmete r flow meter

Xi'an Ao Xin Automation Instrument Co., Ltd.  

 

(formerly named   Xi'an Ao Xin Automation Instrument Pneumatic Co.,ltd.) is a leading Chinese company specializing in the Dwyer flowmeter    Pressure Measurement  and some other kinds of products . We are a key member China of Pneumatic Association, and is awarded AAA Credit Grade by Bank of China.

 

High quality of the raw materials, the precision of the parts, the hard tests during and at the end of production are a warranty of reliability and features. Our real strength is to develop customised products to solve any requirement of utilisation. The production runs conforming to the rigorous ISO 9001/2000 requirements .The product range consists of  pressure switch pressure gauge differential pressure switch  transmitter sensor flowmrter  etc   ,which are found in a variety of industrial applications such as machinery, metallurgy, food, textile and waste treatment.

Pressure, Temperature and Flow Monitoring

 

The Series GFM4 Gas Mass Flow Meter 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. Standard LCD and four button keypad allows easy access to the many features of the GFM4. 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.

 

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 128x64 graphical LCD with backlight.
• Internal conversion factors for up to 32 gases.
• Automatic zero adjustment.
• Self diagnostic tests.

 

Specifications

 

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).