How to Adjust Parameters of a Thermal Flow Switch

How to Adjust Parameters of a Thermal Flow Switch‌

Parameter Adjustment Procedure‌

Based on technical documentation for the NK300 Series and NK Series thermal flow switches, follow these steps:

I. Pre-Adjustment Preparation‌

Verify Model Functions‌

NK300 Series‌: Adjust via potentiometer; LED indicators display flow status.

NK Series‌ (with integrated temperature): Adjust via buttons; 0.96-inch color screen displays flow/temperature.

Installation Requirements‌

Ensure the probe is fully immersed in the medium, avoiding bubbles or impurities.

Confirm power supply (24V DC) and output signal wiring (PNP/NPN/relay, etc.).

II. Parameter Adjustment Steps‌

1. NK300 Series (Potentiometer Adjustment)‌

Flow Setting‌

Rotate the potentiometer knob (no need to remove sealed screws). Observe 6 LED indicators:

Number of lit LEDs indicates flow velocity (all lit = flow达标).

Adjust threshold per medium type:

Water: 1–150 cm/s; Oil: 3–300 cm/s; Air: 20–2000 cm/s.

Response Time‌

Default: 2 seconds (typical). Adjust sensitivity by extending/shortening initialization (~8s).

2. NK Series (Button + Color Screen Adjustment)‌

Flow/Temperature Setting‌

Enter setup mode via device buttons; screen displays real-time flow/temperature.

Configure per technical specs:

Flow dead zone: ≤0.01 m/s; Temperature gradient: ≤4°C/s.

Support for IO-Link or analog output calibration (e.g., 4–20mA ↔ flow range).

III. Key Considerations‌

Medium Compatibility‌

Scaling/oil contamination may reduce sensitivity. Clean regularly (anti-scaling coating delays fouling).

Electrical Safety‌

Ensure stable power during adjustment to avoid reverse polarity/short-circuit triggers.

Function Verification‌

Simulate flow changes (e.g., pump start/stop) to confirm signal output (relay actuation or PNP/NPN switching).

IV. Technical Parameters Reference‌

Pressure Resistance‌: 100 Bar

IP Rating‌: IP67

Repeatability‌: ±2% (NK300 Series)

Temperature Compensation‌: Auto-calibration for NK Series (±1.5°C accuracy).

ℹ️ Contact the manufacturer for customization (e.g., special media/output signals).