Controllers can be programmed for various control functions including flow set point, totalizer, stop totalizer, totalize from preset flow, stop and preset total, auto zero, and more. Auto zero feature utilizes an automatic balancing circuit that virtually eliminates drift of zero and span. In addition, Series DMF controllers have two dry contact closures to operate pumps, valves, or other process equipment.

 

The Series DMF features an auto tune function to optimize control response for a specific gas under actual process conditions. Self diagnostic tests are run at power up to ensure the controller is in optimum working condition. Calibration information for up to 10 gases and conversion factors for up to 256 different gases are stored in memory. High and low gas flow alarm limits are programmed via RS-485 interface. Software supports programmable flow modes, allowing execution of custom programming of up to ten steps.

Specifications

Service: Clean gases compatible with wetted parts.

Wetted Materials: 316 SS, 416 SS, fluoroelastomer o-rings.

Accuracy: ±1% FS including linearity between 59 to 77°F (15 to 25°C) and 10 to 60 psia (0.7 to 4 bar); ±2% FS from 32 to 122°F (0 to 50°C) and 5 to 150 psia (0.3 to 10 bar).

Repeatability: ±0.15% of full scale.

Response Time: 0.6 to 1.0 second to within ±2% of setpoint over 20% to 100% FS.

Output: Linear 0-5 VDC (2000 Ω min. load impedance); 0-10 VDC (4000 Ω min. load impedance).

Maximum Particulate Size: 100 microns.

Temperature Limits: 41 to 122°F (5 to 50°C).

Power Supply: ±15 VDC; 13.5 watts maximum.

Process Connections: 1/4″ compression fitting for flow rates ≤50 L/m; 3/8″ for flows ≥60 L/m.

Pressure Limits: 500 psig (34.5 bar).

Leak Integrity: 1 x 10^-9 sccs of Helium.

Computer Interface: RS-485.

Agency Approvals: CE.