Kofloc EX-250S Digital Mass Flow Controller

Description

In industrial environments classified as “Hazardous Areas,” standard electronic controllers pose a risk of ignition. The Kofloc EX-250S Digital Mass Flow Controller addresses this by utilizing an intrinsically safe design that limits electrical energy to levels below what is required to ignite an explosive atmosphere. Unlike manual needle valves, this digital controller uses a closed-loop system. It constantly compares the actual mass flow against your set-point and adjusts the internal valve to maintain a perfect flow rate, regardless of upstream pressure spikes. The “Digital” aspect of the EX-250S ensures high linearity and repeatability, providing a 4–20mA or 0–5V signal that can be safely transmitted to a control room via an isolation barrier. With its all-Stainless Steel (SUS316) construction, it is built to withstand the corrosive atmospheres often found in chemical plants and refineries.

Brand

Kofloc

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.

Specification

Feature	Specification
Control Principle	Thermal Mass Flow Sensor + Proportional Valve
Safety Certification	Intrinsically Safe (Ex ia IIB T4 or equivalent)
Accuracy	Within $pm$ 1.0% to $pm$ 2.0% Full Scale
Response Time	$leq$ 2 seconds
Applicable Gases	Flammable gases ( $H_2$ , $C_xH_y$ ), Oxygen, and Inert gases
Max Operating Pressure	1.0 MPa (Standard)
Wetted Materials	SUS316, Fluororubber (Viton), PTFE
Signal Interface	4–20mA or 0–5V DC (via Safety Barrier)

Features

Intrinsically Safe / Explosion-Proof: Designed for safe operation in Zone 1 and Zone 2 hazardous locations.
Digital Precision: Advanced digital circuitry provides superior linearity and low-drift performance.
Automatic Closed-Loop Control: Maintains a constant mass flow rate even if supply pressures fluctuate.
High Chemical Compatibility: SUS316 Stainless Steel wetted parts for durability with various process gases.
Direct Mass Flow Control: No compensation for temperature or pressure is necessary.
Remote Integration: Standard analog interfaces for seamless connection to PLC, DCS, or SCADA systems.

Applications

The Kofloc EX-250S Digital Mass Flow Controller is critical for:

Hydrogen Energy Systems: Safe regulation of $H_2$ in fuel cell testing and hydrogen stations.
Petrochemical Refining: Controlling feed gases in explosive reactor environments.
Gas Leakage Detection: Precise monitoring of flammable gas lines in industrial plants.
Chemical Synthesis: Managing volatile organic compound (VOC) flows.
Offshore Gas Platforms: Reliable control in harsh, salt-spray, and hazardous zones.