Digital Gas Flow Meter 0–250 L/min (SLPM), RS485 Modbus – Air / O₂ / N₂ or Argon (Ar) Options

Product Overview

This digital gas flow meter is designed for accurate monitoring of gas flow in industrial, laboratory, and process-control applications.
To ensure measurement accuracy, different gas types are factory-calibrated separately, with two selectable versions available.

Gas Type Options (Important)

• Standard Gas Version: Calibrated for Air / Oxygen (O₂) / Nitrogen (N₂)

• Argon (Ar) Version: Specially calibrated for Argon gas

⚠️ Please note:
Although the meter displays flow in L/min (SLPM), internal calibration parameters vary by gas type.
Air/O₂/N₂ and Argon are NOT interchangeable. Please select the correct gas version when ordering.

Key Features

• Ultra-low power consumption, powered by 4 × AA batteries or optional external AC adapter

• Compact, portable design with rotatable meter head

• 30:1 turndown ratio for flexible flow measurement

• RS485 Modbus output (optional) for system integration

• User-programmable flow alarm for safety monitoring

• Internal data storage for process records

• Oxygen-safe copper body, suitable for clean gas applications

Technical Specifications

• Flow Range: 0–250 L/min (SLPM)
  (7 SCFM / 12 NCMH)

• Accuracy: ±(2.0% of reading + 0.5% FS)

• Repeatability: 0.2%

• Response Time: ≤ 2 seconds

• Turn-down Ratio: 30:1

• Display: LCD

• Display Units:

  • Instant Flow: SLPM / L/min

  • Total Flow: NCM / m³

• Resolution:

  • Instant Flow: 0.01 SLPM

  • Total Flow: 0.001 NCM

• Max Pressure: ≤ 0.8 MPa

• Working Temperature: −10 ~ +55 °C

• Storage Temperature: −20 ~ +65 °C

• Calibration Conditions: Air @ 20 °C, 101.325 kPa

• Output: RS485 (optional)

• Interface: Mini USB

• Mechanical Connection: NPT 1/2″

• DN: 12 mm

• Weight: Approx. 350 g

Power Supply

• 4 × AA batteries (not included)

• External DC 5–10 V (optional AC adapter)

Package Contents

• 1 × Digital Gas Flow Meter (0–250 L/min, selected gas type)