D6F-02N2-000 Specification Summary

1. Product Overview

D6F-02N2-000 is a high-precision MEMS (Micro-Electro-Mechanical Systems) analog flow sensor from Omron’s D6F Series, specifically designed for measuring low flow rates of natural gas (13A). Leveraging Omron’s proprietary thermal transfer technology, it detects mass flow rates independent of temperature and pressure fluctuations—eliminating environmental interference common in volumetric flow sensors. The device features a compact aluminum alloy case, Rc 1/4 threaded flow ports for secure piping integration, and a 3-pin connector for electrical interface. Its high accuracy (±3% full scale) and robust construction make it ideal for combustion control, gas appliances, and industrial gas flow monitoring applications. It is RoHS-compliant and rated for industrial temperature operation, ensuring reliability in harsh environments.

2. Key Features

• Sensor Type: Analog MEMS thermal mass flow sensor (natural gas-specific).
• Target Fluid: Natural gas (13A) (dry, clean; no dust, oil, or mist).
• Flow Range: 0 to 2 L/min (volumetric flow rate at 0°C, 101.3 kPa standard conditions).
• Accuracy: ±3% FS (full scale) at 25°C (ambient temperature).
• Electrical Output: 1 to 5 VDC non-linear analog output (load resistance ≥10 kΩ).
• Power Requirements: 10.8 to 26.4 VDC supply voltage; 15 mA max current consumption (no load, 12–24 VDC, 25°C).
• Mechanical Design:
• Environmental Performance:
• Reliability:
• Compliance: RoHS-compliant (no restricted substances per EU RoHS Directive).

3. Part Number Decoding

4. Pin Configuration & Wiring (3-Pin Connector)

The sensor uses a 3-pin connector (Molex 53398-03** series) for electrical connection. Compatible connectors and wiring details are as follows:

Compatible Connector Components

5. Absolute Maximum Ratings

6. Electrical & Flow Characteristics (TA = 25°C, Vcc = 12 ± 0.1 VDC, RH = 35%–75%)

6.1 Core Electrical Specifications

6.2 Flow Performance

7. Mechanical Specifications

7.1 Package Dimensions (Aluminum Alloy Case; Units: mm / inches)

7.2 Piping & Installation

• Thread Torque: Tighten Rc 1/4 pipes to 5 N·m max (over-tightening may cause thread damage/leaks).
• Pipe Sealing: Use pipe sealer (avoid applying to first 2 threads from the end to prevent contamination).
• Mounting Screws: M3 panhead screws (max torque: 0.59 N·m) for secure case installation.

8. Functional Operation

8.1 Working Principle

D6F-02N2-000 operates on the thermal transfer principle (Omron’s MEMS thermal flow technology):

1. A micro-heater (integrated on the MEMS chip) maintains a constant temperature above the ambient gas temperature.
2. As natural gas flows through the sensor’s micro-channel, it carries heat away from the heater—creating a temperature gradient between two upstream/downstream thermopiles (temperature sensors).
3. The thermopiles generate a differential electromotive force (EMF) proportional to the mass flow rate of the gas.
4. This EMF is amplified and conditioned to produce a 1–5 VDC analog output, which is independent of temperature and pressure changes (eliminating the need for external compensation).

8.2 Key Operational Notes

• Omnipolar Response: No polarity dependence for gas flow (output depends only on flow rate magnitude, not direction).
• Dust Resistance: Not equipped with a dust segregation system—use clean, dry natural gas (install a filter/mist separator if gas contains contaminants).
• No Load Operation: Do not operate the sensor with an open-circuit output (load resistance ≥10 kΩ required to prevent circuit damage).

9. Typical Applications

• Combustion Control: Natural gas boilers, furnaces, and industrial burners (optimize fuel-air mixing for efficiency).
• Gas Appliances: Residential/commercial gas stoves, water heaters (monitor gas flow for safety and performance).
• Industrial Monitoring: Low-flow natural gas lines (leak detection, process control).
• Medical/Instrumentation: Precision gas delivery systems (analyzers, calibration equipment).

10. Application Guidelines

10.1 Piping Installation

1. Filter Requirement: Install a 5–10 μm filter upstream of the sensor to remove dust, oil, or mist (prevents micro-channel clogging).
2. Flow Direction: Align gas flow with the arrow marked on the sensor case (reverse flow causes measurement errors).
3. Sealing: Apply pipe sealer to Rc 1/4 threads (avoid excess sealer to prevent sensor contamination).

10.2 Electrical Interface

1. Wiring: Use twisted-pair cables for Vcc, Vout, and GND to minimize electromagnetic interference (EMI).
2. Surge Protection: Install a surge absorber near the sensor if the system is exposed to voltage spikes (e.g., from motor starters).
3. Calibration: Perform zero-point calibration at installation (0 L/min flow) to account for ambient offsets.

10.3 Environmental Considerations

• Avoid locations with direct sunlight, water/oil exposure, or extreme temperature changes (may degrade accuracy).
• Operate within -10°C to +60°C (condensation/icing causes permanent damage to the MEMS chip).

11. Accessories & Compliance

11.1 Included/Optional Accessories

11.2 Compliance & Certifications

• RoHS: Compliant (no lead, mercury, hexavalent chromium, PBB, PBDE, or cadmium).
• Standards: IEC 60664-1 (insulation/creepage), DIN EN 175301-803-A (flow sensor safety).

12. Ordering & Support

• Part Number: D6F-02N2-000
• Shipping: Bulk packaging (custom reel packaging available on request).
• Technical Support: Refer to Omron’s D6F Series User’s Manual (Manual No. A286-E1) for detailed calibration and troubleshooting. Contact Omron regional support for application-specific guidance.