NPN Output

Specifications

NPN Output

Power Supply	24V 200mA
Reverse Polarity Protection	Yes
NPN Wiring	Supported (PNP wiring not supported)

Wiring

NPN Output Wiring Diagram

• Brown: 24 VDC (+), Blue: 0 VDC (–), Orange: NPN Output (+)

This function operates only when the brown and blue lines are powered by a DC supply.

NPN Parameter Configuration

Follow the steps below to configure NPN output parameters:

1

Set Basic Parameters

• Refer to the Parameter Settings page and complete the following steps: Language Setting, Pipe Settings:A02: Pipe Standard, A04: Pipe Outer Diameter, A06: Pipe Wall Thickness, A08: Pipe Material

• Execute Z03 (Automatic Initialization).

2

Wiring Setup

Connect the NPN output wiring according to the instructions on this page.

3

E01 – NC/NO (Normally Closed or Normally Open)

Set parameter E01 NC/NO to select the default state:

• NC (Normally Closed): Conducting when idle

• NO (Normally Open): Open when idle

4

E02 – OCT Definition (Output Signal Type)

Set parameter E02 OCT Info to specify the output signal.

• If “Pulse V2” is selected:

  • Use E03 Pulse Width to set the duration of each pulse.

  • Use E14 Pulse V2 Unit to define the capacity represented by each pulse.

• If “Total Alarm” is selected:

  • Use D09 Total Alarm to enable the alarm.

  • Use D10 Total Trig. to set the trigger condition:

    • “Greater than Target” for forward flow

    • “Less than Target” for reverse flow

  • Use D11 Total Target to specify the cumulative target:

    • Positive value for forward flow

    • Negative value for reverse flow

  (See Note 1)

• If “Flow Alarm” is selected:

  • Use D05 FlowLIM Alarm to enable the flow range alarm.

  • Use D06 UP LIM (Upper Limit) and D07 Low LIM (Lower Limit) to define the normal flow range.

  Note: If either D06 or D07 is adjusted, the other must also be set; otherwise, the display may not function correctly. If both are unset, default values are D06 = 100, D07 = 0.

  • Use D08 Hysteresis to define the hysteresis operation method. Values must be positive and expressed as a percentage; larger values reduce repeated alarm triggers.

  (See Note 2)

5

Return to the main screen. Complete.

Note 1

D09、D10、D11 Total Alarm Examples

Example 1: Forward Flow
Enable D09 Total Alarm.
Set D10 Total Trig. to “Greater than Target”.
Set D11 Total Target to a positive value, e.g., +100.
When the cumulative forward flow exceeds 100, 
the system triggers the total alarm.

Example 2: Reverse Flow
Enable D09 Total Alarm.
Set D10 Total Trig. to “Less than Target”.
Set D11 Total Target to a negative value, e.g., -500.
When the cumulative reverse flow drops below -500, 
the system triggers the total alarm.

Note 2

Flow Range Limit Alarm Example (Click to Expand)

D06 Upper Limit: 30 LPM
D07 Lower Limit: 10 LPM
D08 Hysteresis: 3% (default)

Calculations:
Range: 30 − 10 = 20 LPM
Hysteresis: 20 × 3% = 0.6 LPM

Alarm Behavior:
When flow exceeds the upper limit (30 LPM), the alarm is triggered.
The alarm will clear only when the flow drops below 29.4 LPM (30 − 0.6).
When flow falls below the lower limit (10 LPM), the alarm is triggered.
The alarm will clear only when the flow rises above 10.6 LPM (10 + 0.6).