NPN output

Specifications

NPN Output

Power supply spec	24V
Reverse voltage protection	Yes
PNP connection	No
Maximum output frequency	700Hz
Overcurrent protection	200mA

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 (H04 Language), Pipe Settings (A01 Pipe Type), Unit Settings: (B01 Vol. Unit), (B02 Time Unit), (B03 Total Unit), (A08 Pipe Material)

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 Output” is selected:

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

  • Use F03 to activate the pulse simulation function and verify that the receiving device correctly detects the pulse count.

• 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.

  • Use F03 for pulse simulation, and confirm the signal is correctly received by the downstream system.

• If selecting "Flow Out-of-Range Notification":

  • Use D04 to enable the alarm.

  • Use D05 and D06 to set the acceptable flow range.

  • Use D07 to set hysteresis control — a positive value will reduce the likelihood of repeated alerts by adding a delay buffer.

  • Use simulation parameters F01 and F02, then return to the main screen to confirm the alarm functions as expected.

  • Turn off simulation once confirmed.

• If selecting "Cumulative Flow Exceeded Notification":

  • Use D08 to enable the alert.

  • Use D09 to define the trigger condition:

    • “Greater than” for positive flow

    • “Less than” for negative flow

  • Use D10 to define the target cumulative volume:

    • Positive values for positive flow direction

    • Negative values for reverse flow direction

  • Use F01 and F02 to simulate, and return to the main screen to verify alarm operation.

  • Turn off simulation after verification.

• 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.

Pulse Output

The pulse output function provides a direct count of paddlewheel rotations. One pulse is generated for every 180 degrees of paddlewheel rotation.

At a flow velocity of 10 m/s, the maximum output frequency will not exceed 300 Hz.

As this output does not utilise LORRIC’s internal data processing algorithms, it is recommended for use in applications where high precision is not required.

To calculate totalised flow over a given period, simply divide the number of received pulses by the scale factor corresponding to the pipe size. Please refer to the following reference data for scale values.

Plastic (PVC, PP, PVDF) T-connector

Pipe diameter	Model	Metric ratio (pulses per litre)	US Gallon (pulses per US gal)	UK Gallon (pulses per UK gal)
1/2"	FP-P016	106.55	403.33	484.38
3/4"	FP-P020	67.23	254.48	305.62
1"	FP-P025	53.33	201.89	242.46
1-1/4"	FP-P032	24.44	92.51	111.11
1-1/2"	FP-P040	17.02	64.43	77.38
2"	FP-P050	9.86	37.31	44.81
2-1/2"	FP-P065	5.42	20.52	24.64

Pulse V2 Output

This feature has undergone limited scenario testing and is currently in the public testing phase. Please thoroughly test and carefully assess suitability before deploying it in operational environments.

Pulse V2 is a proprietary feature developed by LORRIC, based on its patented AxleSense technology.

This advanced algorithm allows users to define a fixed volume per pulse, and the system will generate one pulse each time the specified volume passes through the meter.

In addition, the system intelligently compensates for low-flow discrepancies, further reducing pulse output error.

Compared to traditional pulse output — which simply emits a pulse each time the paddlewheel blade passes the sensor — Pulse V2 offers two key advantages:

1. Easier configuration for users, as volume-based pulses are more intuitive when setting up controllers.

2. Improved accuracy at low flow rates, due to built-in compensation logic.