Kofloc DF-550C SERIES All-Metal Digital Mass Flow Controller
Kofloc DF-550C SERIES All-Metal Digital Mass Flow Controller

Kofloc DF-550C SERIES All-Metal Digital Mass Flow Controller

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DF-550C is now released as an all-metal model of the high-performance digital mass flow controller DF-250C Series. The metal sealed structure enables controlling the measurement of corrosive gases such as semiconductor process gases.


  • Response improved to 1 sec or faster in all flow rate ranges thanks to a new solenoid
  • The stainless steel seal supports high-reactive gases.
  • Lineup ranging from 10 SCCM to 10 SLM
  • Two communication ports enabling daisy-chaining
  • RS-485 communication function installed as standard
  • RoHS CE standard compliant


Sensor type Thermal sensor
Valve type Normally closed proportional solenoid valve
Applicable gases*1 N2, Air, H2, He, Ar, O2, CO2, etc.
Gases not specifically mentioned here are subject to calibration for N2 equivalent.)
Flow range*2 10 SCCM to 10 SLM
Control range 2 to 100% (F.S.)
Response*3 Total flow rate control range ≤ 1 sec (within ±2% F.S.)
Accuracy*4 ±1.0%F.S.
Repeatability ±0.25%F.S.
Operating differential pressure*5 50 to 350 kPa (100 to 350 kPa for F.S. 10 SLM)
Inlet maximum pressure 500kPa(G)
Proof pressure 980kPa(G)
External leak rate ≤ 1.0 x 10-11 Pa·m3/sec (He)
Temperature Working temp. 5 to 50℃
Accuracy guaranteed temp. 15 to 35℃
Allowable storage temp. -10 to 60℃
Allowable operating humidity 10 to 90% RH (without dew condensation)
Materials of gas contact part SUS316L, PTFE, and magnetic stainless steel
Electrical connection D-sub 9-pin, KFC standard (SEMI standard compliant), RJ-45 modular jacks (two)
Flow rate setting signal 0 to 5 V DC (input impedance approx. 1 MΩ)
Flow rate output signal 0 to 5 V DC (load resistance 10 KΩ)
Digital communication Address setting with RS485 rotary switch: up to 99 devices (9600 bps)
Required power supply (DC) +15 V DC (±5%), 150 mA; -15 V DC (±5%), 150 mA
Joint 1/4 VCR or equivalent
Mounting posture Horizontal installation recommended.
Weight Approx. 1100 g

*1 The gases must be dry and clean, free of corrosive components and foreign matter such as dust and mist.

*2 The flow rate units SCCM and SLM indicate a mass flow rate converted to a volume flow rate in cc/min and L/min at 0°C and 1 atm

*3 Guarantee for calibration gas: N2.

*4 Accuracy for calibration gas: N2, flow range (max. full scale).

*5 The operating differential pressure may differ depending on specifications.


untuk info product dan harga silahkan hubungi  : sales@wmablog.com

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