The actual volume flow is recorded using a membrane pressure transmitter by means of the differential pressure method. For long-term stabilisation of the measurement, the standard scope of delivery includes an automatic zero-point compensation procedure. This ensures that the measurements will be continued to be exact, even at low differential pressures. The measured volume flows are evaluated and, in accordance with the control algorithm, cause the damper in the volume flow controller to be adjusted by the connected continuous actuator. The controller acts rapidly and stably, and the response time is less than 3 seconds. At fume hoods, the current operating state is indicated on a control panel

The exchange of actual volume flow values with other control systems only takes place by means of standard network variables (SNVT) via the LON bus.

To meet the demands of a variable and diverse control mechanism, the system is equipped with configurable I/O interfaces in addition to the LON interface.

• Integrated membrane pressure transmitter with zeroing valve
  for long-term stabilisation of the measurement
  



• LON bus interface physically implemented via FTT10A transceiver
  - With double terminals for simple installation
  - Service button for transmission of Neuron ID during commissioning



• LON bus data interface via standard network variable types (SNVT)
  - Configuration of all settings for controller operation and software update
  - Visibility of all actual values, current set values, types of operation and settings
  - Swichting the operation type via LON or digital inputs with priority classification
  - Alarm messages via LON / digital output



• 2 Digital inputs for potential-free contacts, e.g. for
  - Switching between day / night / full shut-off operation with switches
  - Integration of contact for detection of 500 mm window opening as per DIN 14175
  - Integration of a motion sensor



• 1 Digital output as a switching contact (changeover relay)
  - Changeover contacts, e.g. for conventional alarm forwarding to BMS systems



• 1 Analogue input for 0-10 V or 2-10 V signals
  - System usage fume hood controller: Input occupied by velocity sensor
  - System usage pressure controller: Input occupied by pressure transmitter
  - System usage room controller: Input for applying 0-10 V signal e.g. volume flow



• 1 Analogue output for 0-10 V or 2-10 V signals
  Occupied by the actuator of the controller



• Slot for standard control panel of TCU-LON-II system
  Expanded control panel AF-1 only in combination with certain control components



• Supply voltage 24 V AC/DC
  with double terminals for simple installation