Summary #

Flow sensors measure the flow rate of water moving through a line, in liters or gallons per hour. They can trigger an alarm on unusually low or high flow, and their reading can be used to keep a 1-10V-controlled pump’s output constant. This guide covers connecting a flow sensor and configuring its calibration, alarm, and regulation settings.

Applies to #

• ProfiLux 4 Series (incl. Industrial Line / IL)
• ProfiLux 3 Series
• Software:
  • GHL Connect (App, Webinterface, myGHL)
  • GHL Control Center

Before you start #

• Splitter Cable (Optional): A GHL Y-Splitter cable (PL-LY) if you want to connect two sensors to a single port.

Step 1: Hardware Setup & Connection #

Flow sensors connect to a Level port on the ProfiLux, an Expansion Box, or an Expansion Card.

Connecting the Sensor #

Connect the sensor using one of the following methods:

• Direct Connection: Plug the sensor directly into a Level port (e.g., Level 1/2). If plugged into Level 1/2 without a splitter, this sensor will be addressed as Sensor index 1.
  
• Using a Splitter Cable (PL-LY): Each physical level port can manage up to two sensors. By using a GHL Y-splitter cable, you can connect two sensors to a single port.
  Example: A splitter on Port 1/2 provides connections for Sensor index 1 and Sensor index 2. A splitter on Port 3/4 provides Sensor index 3 and Sensor index 4.

Physical Port Orientation #

On devices with stacked Level ports (such as the ProfiLux 4 or expansion cards), the bottom port always carries the lower numbering.

• ProfiLux 4: The bottom port is Level 1/2, and the port directly above it is Level 3/4.

Logical Numbering Sequence #

If your system includes expansion cards or an Expansion Box, the system assigns sensor indices (the numbers you select in the software) in the following order:

1. Built-in Ports: Ports integrated directly into the ProfiLux controller (e.g., Level 1–4).
2. Controller Expansion Cards: Level ports on cards installed inside the ProfiLux.
3. Expansion Box (Built-in): The integrated Level port of the Expansion Box.
4. Expansion Box Cards: Level ports on cards installed inside the Expansion Box.

The numbering continues sequentially. For example, if your ProfiLux 4 occupies indices 1–4, the first port on an added expansion card will start at index 5.

Step 2: Accessing the Settings #

• GHL Control Center: Go to Probe/sensor controls -> Flow-sensors.
• GHL Connect App: Go to Control -> Flow-sensors.

All connected flow sensors are listed together on one page, with fields for Index, Actual Flow, Alarm Threshold, Nominal Value, Calibration, Connected at Level-Sensor, Description, and Unit.

Step 3: Configuration #

• Nominal Value: The target flow rate the controller regulates toward when using 1-10V-based flow control.
• Connected at Level-Sensor: Selects the Level sensor index this flow sensor is physically connected to.

Calibration #

The Calibration field holds the sensor’s calibration value in ml/pulse, used to convert pulses into a flow rate. For the standard calibration, use the calculator.

• GHL Control Center: Select the sensor’s row in the table, then click Determine calibration.
• GHL Connect App: Tap the calculator icon under Calibration in the sensor’s entry.

This opens a dialog to calculate the calibration value:

• Flow-Sensor Model: 2000, 5000, or 9000 l/h.
• Flow-Sensor is Operated in a Bypass: Enable if the sensor only measures a portion of the total flow.
• Flow Through the Bypass in % (if the bypass option is active): The percentage of the total flow passing through the sensor.
• Determined Calibration Value (read-only): The calculated result, applied to the Calibration field once confirmed.

Alarm #

The Alarm Threshold triggers an alarm if the flow drops below this value; set it to 0 to disable the alarm. In GHL Control Center it’s editable directly in the table. In the App, it’s set together with further options via a dedicated dialog:

• GHL Control Center: Select the sensor’s row, then click Alarm deactivation.
• GHL Connect App: Tap the gear icon under Alarm in the sensor’s entry.

This opens a dialog with:

• Alarm Threshold (App only — already editable directly in the table in GHL Control Center).
• Deactivate During Maintenance: Selects which of the four maintenance programs suppress this alarm.
• Deactivate During Feed Pause: Selects which of the four feed pauses suppress this alarm.

Notes #

• A flow sensor’s reading can be used to keep a pump’s flow constant via a 1-10V interface — see 1-10V Pump Control – Setup Guide.