Kofloc 8500MM Mass Flowmeter

This mass flow controller/meter driven by a 24 VDC power supply has been developed as a successor to the MODEL8300.



This mass flow controller/meter driven by a 24 VDC power supply has been developed as a successor to the MODEL8300.

The view point change function of the display unit and the pattern setting function are unique to this model, and noise resistance has been improved dramatically. A sister model with a detachable display and setting unit is also available.




The natural environment is preserved through the balance of solids, liquids and gases that exist on the earth. However, human civilization has caused pollution that has greatly damaged our environment. The task of the present generation is to restore our environment to its natural healthy state. And this is also the greatest challenge for 21st century science and technology.

KOFLOC's corporate motto is "A Scientific Approach for Fluids." In other words, we create products that scientifically measure and control the balance of liquids and gases. We trust that through our work we are making a contribution to the regeneration of the environment and to the establishment of a prosperous society.


  • The high-lift actuator allows this compact model to control a large fl ow rate.
  • Equipped with a display and setting unit, this model can be op-erated by a 24 VDC power supply
  • The RS232C/RS485 communication function and integration function are provided as standard equipment.
  • The 14-bit converter permits display and operation in 4-1/2 dig-its.
  • Control of the fl ow rate of infl ammable gas is possible, because the heat generating part of the sensor is not exposed to gas.
  • There are no limitations on the mounting position that may be employed.
  • In addition to SV setting, fi ve other patterns can be set.
  • Auto zero and auto close functions are also standard.


ITEM 8500MC/MM 8550MC/MM
Flow range 10SCCM〜20SLM 30SLM〜100SLM
(N2 equivalent 20℃/1ATM) (freely selectable) (freely selectable)
Sensor type Thermal sensor
Valve type(*1) Normally closed proportional solenoid valve
Control range(*1) 2〜100%(F.S.) 5〜100%(F.S.)
Response(*1) ≤2sec ≤3sec
(within±2%F.S) (within±2%F.S.)
Accuracy ±1.0%F.S.(25℃) ±1.5%F.S.(25℃)
Temperature coefficient ±0.1F.S./℃(15〜35℃) ±0.2F.S./℃(15〜35℃)
Repeatability ±0.5%F.S.
Operating differential
F.S.≤5SLM 50〜300kPa(G) F.S.≤50SLM 150〜300kPa(G)
F.S.>5SLM 100〜300kPa(G) F.S.>50SLM 200〜300kPa(G)
Option:Medium differential pressure(MP), low differential pressure(LP)
specifications are available
Allowable operating pressure(*1) 500kPa(G) or less
Proof pressure 980kPa(G)
Leak rate ≤1×10−8Pa・㎥/s(excluding permeation of He)
Allowable operating temperature 5〜45℃
Allowable operating humidity 10〜90%RH(No condensation allowed)
Materials of gas contact part Body : SUS316
Valve seat : FKM(option : CR or NBR)
Sealing : FKM(option : CR or NBR)
Electrical connection Dsub half pitch 20pin DX10M−20S(HRS)
Flow rate setting signal 0〜5VDC(input impedance 100kΩ or more)
(*1) or 4〜20mA selectable
Flow rate output signal 0〜5VDC(external load resistance 250kΩ or more) or
4〜20mA (external load resistance 300Ω or less)selectable
Communication RS232C(3 wire)or RS485(3 wire) selectable
Other functions Instantaneous flow rate・integrated flow rate display ( 7-segment 4-digit LED
display accuracy ±1% integrated display 0000〜9999MAX),
Alarm output(NPN open collector output 2 points
Max DC35V 50mA), pattern setting(5 pattern) function
Required power supply 24VDC±10%(ripple 5%) current consumption 300mA max
Joint Standard 1/4F900(9/16-18UNF) Standard 3/8F900(9/16−18UNF)
(Main unit bore) Option 1/8F900, 1/4UJR, Option 1/2F900, 3/8UJR,
Rc1/4 etc. Rc3/8 etc.
Weight Approx. 1200g Approx. 1500g

(*1)Only for mass flow controller.

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