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

Kofloc DF-300C Series Digital Mass Flow Controller with Indicator 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.

Kofloc DF-300C Series 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

Specification

Sensor type		Thermal sensor
Valve type		Normally closed proportional solenoid valve
Applicable gases1		N2 (Air, H2, He, Ar, O2, CO2) 2
Flow range 3		10/30/50/100/300/500 SCCM, 1/3/5/10 SLM2
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 6
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-sub15-pin male, high density, HR-10A (two)
Flow rate setting signal		0 to 5 V DC (input impedance: approx. 1 M?), or 4 to 20 mA (input impedance: approx. 250)
Flow rate output signal		0 to 5 V DC (load resistance 10 k?), or 4 to 20 mA (load resistance 500)
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