Product Overview

The 2-Color Digital Flow Sensor 21 is a precision flow measurement device designed for accurate and reliable monitoring of fluid flow in small workpiece applications. It enables both flow management and suction lift verification, making it ideal for processes requiring precise control over airflow or gas movement. With bi-directional flow capability, the sensor can detect flow in either direction, offering flexibility during installation and operation.

Construction and Materials

Constructed with a platinum sensor chip processed using silicon micromachining technology, the sensor delivers high accuracy and fast response times. The unit integrates a flow adjustable needle valve directly into the sensor body, eliminating the need for separate components and simplifying piping configurations. This compact design saves space while ensuring ease of installation in tight industrial environments.

Configuration and Connections

The sensor features a dual-configuration interface with bi-directional (R) or uni-directional (F) flow settings, allowing users to pre-set the desired flow direction during installation. This flexibility enables use as a reverse flow detector when needed. The device includes a reversible display function that automatically rotates the LCD orientation when installed upside down, ensuring consistent readability regardless of mounting position.

Operating Characteristics

The sensor operates within a temperature range of 0 to 50°C (no condensation), and can handle pressure ranges from -0.09MPa to 0.75MPa with a pressure proof rating of 1MPa. Temperature characteristics are specified at ±0.2% F.S./°C over the 15–35°C range, while pressure characteristics show ±5% F.S. (secondary side to atmosphere), and for the 201 model, ±5% F.S. when referenced at 0.35 MPa. Response time is as fast as 50msec or less (OFF state), enabling real-time flow monitoring with minimal delay.

Sizes and Options

Available in multiple full-scale flow rate options—0.5L/min, 1L/min, 2L/min, 5L/min, 10L/min, 20L/min, 50L/min, 100L/min, and 200L/min—the sensor supports a wide range of applications from low-flow diagnostics to high-volume process control. The display is a 4 digits + 4 digits 2-color LCD, capable of showing flow rates in both mL/min and L/min across all models, with ranges extending from -549mL/min to +549mL/min for bi-directional operation.

Installation and Integration

The sensor provides multiple output options including switch outputs (NPN or PNP open collector, up to 50mA, ≤2.4V) and analog outputs (1–5V or 4–20mA), allowing seamless integration with control systems, PLCs, or data acquisition units. Current consumption is limited to 45mA or less, ensuring low power draw in continuous operation.