Kofloc DF-300C SERIES Digital Mass Flow Controller with Indicator

The Model DF-300C Series is a mass flow controller with an integral indicator that operates on a 24-V power supply, as developed in response to the requests from users of the DF Series.

It inherits the features of the DF-200C Series with enhanced convenience, including accuracy of ±1% S.P., response ≤1 sec (in all ranges), and the multiple-gas, multiple-range versatility, i.e.,
support of seven gases (including reference gas) and the ease of changing the flow rate range of each gas.

Features

• High accuracy (±1% S.P.), fast response (≤ 1 sec in all ranges)
• Support of multiple ranges and multiple gases
• Communication functions installed as a standard feature (RS485)
• RoHS CE standard compliant
• Driven by a single 24 V DC supply voltage
• With or without indicator (selectable)
• Selectable Input/output signal

Another Article: The Technology of Ultrasonic Flowmeter Working Principle of Flow Meter How to Choose a Flow Meter Models and Types of Flow Meter Sound Velocity of Material Principle Working of Coriolis Mass Flow Meter

Specification

Sensor type		Thermal sensor
Valve type		Normally closed proportional solenoid valve
Applicable gases*1		N2 (Air, H2, He, Ar, O2, CO2)*2
Flow range*3		10/30/50/100/300/500 SCCM, 1/3/5/10 SLM*2
Control range		2 to 100% (F.S.)
Response*4		Total flow rate control range ±1 sec (within ±2% F.S.)
Accuracy*5		±1.0% S.P. (> 35% F.S.) ±0.35% F.S. (≤ 35% F.S.)
Repeatability		±0.25% F.S.
Operating differential pressure*6		50 to 300 kPa (100 to 300 kPa for Ar and CO2)
Inlet maximum pressure		500kPa（G）
Proof pressure		980kPa（G）
External leak rate		≤1.0 x 10-8 Pa·m3/sec (He)
Temperature	Working temp.	5 to 50℃
	Accuracy guaranteed temp.	15 to 35℃
	Allowable storage temp.	-10 to 60℃
Permissible ambient humidity Allowable operating humidity		10 to 90% RH (without dew condensation)
Materials of a gas contact part		SUS316, SUS316L, magnetic stainless steel, Ni, PTFE, PCTFE, and FKM
Electrical connection		D-sub 15-pin male, high density, HR-10A (two)
Flow rate setting signal		0 to 5 V DC (input impedance: approx. 1 MΩ), or 4 to 20 mA (input impedance: approx. 250 Ω)
Flow rate output signal		0 to 5 V DC (load resistance 10 kΩ), or 4 to 20 mA (load resistance ≤ 500 Ω)
Digital communication		Address setting with RS485 rotary switch or indicator: up to 99 devices (9600 bps)
Event input		Three contact inputs (non-insulated)
Event output		Three NPN open collectors (non-insulated, max. rating 35 V, 50 mA)
Required power supply (DC)		+24 V DC (±10%), 300 mA max. (DC jack, D-sub)
Joint*7		1/4 F900 (standard), 1/4 UJR, Rc 1/4
Mounting posture		Horizontal installation recommended.
Weight*8		Approx. 950 g