Measurement and control

The measurement of actual values is extremely important for the efficient operation of ventilation systems. For this task, HLU has special components that can be used in chemically aggressive exhaust air.
The measured values are used for simple system monitoring or as input signals for a higher-level control system that controls the actuators in the system in question.

Volumstromregler

Variable volume flow controller with auxiliary power

HF – VRR

Application
  • used to keep air flows constant under changing pressure conditions
  • full shut-off possible due to integrated tight-closing shut-off damper
Features
  • volume flow from 50 to 4500 m³/h
  • minimum pressure difference 100 Pa at nominal volume flow
  • available in 12 nominal diameters from 110 to 400 mm connection diameter
Volume flow50 to 4.500 m³/h
Pressure difference minimum pressure difference 100 Pa at nominal volume flow
Nominal diameters 12 nominal diameters from 110 to 400 mm
Material PPs, PVC, PP, PE
Connection optionsflange or sleeve connection

Advantages:

  • fast, precise regulation with an accuracy of +/- 5% of the set volume flow.
  • tight closing in accordance with DIN 1946-4 | airtight shut-off
  • possibility of using controllers from different manufacturers either electrically or pneumatically
  • differential pressure determined by means of integrated Venturi nozzle
Variable volume flow controller leaflet
Konstantvolumstromregler

Volumetric flow regulator without auxiliary power

HF – VRM

Application
  • used to keep air flows constant under changing pressure conditions
Features
  • volume flow from 75 to 3200 m³/h
  • minimum pressure difference 100 Pa at nominal volume flow
  • available in the nominal diameters from 110 to 315 mm connection diameter
Volume flow 75 to 3.200 m³/h
Pressure differenceminimum pressure difference 100 Pa at nominal volume flow
Nominal diameters von 110 – 315 mm
Material PPs, PVC | Special materials optionally available
Connection optionsflange or sleeve connection

Advantages:

  • regulation without the need for auxiliary energy
  • adjuster with scale
leaflet VRM
VFL mit Flansch

Volumetric flow regulator

VFL

Application
  • Constant volume flow controller in round design for constant control of airflows
Features
  • volume flow from 14 to 764 m³/h
  • available in the nominal diameters from 90 to 250 mm connection diameter
leaflet
Messdüsen

Volumetric flow monitoring

HF – VRR measuring nozzle

Application
  • used to measure air flows
Features
  • volume flow from 50 to 4500 m³/h
  • available in the nominal diameters from 110 to 400 mm connection diameter
Volume flow 50 to 4.500 m³/h
Nominal diameters from 110 to 400 mm
Material PPs, PVC | Special materials optionally available
Connection optionsflange or sleeve connection

Advantages:

  • differential pressure determined by means of integrated venturi nozzle
Luftstromüberwachung

Airstream monitoring

HF – ASM-MU

Application
  • used to monitor airflows
Features
  • available in the nominal diameters from 75 to 400 mm connection diameter
Nominal diameters from 75 to 400 mm
Material PPs, PVC | Special materials optionally available
Design integrated evaluation electronics, output relays, adjustment potentiometers and LEDs, and a time relay for start-up suppression
Connection optionsflange or sleeve connection

Advantages:

  • calorimetric sensor in protective plastic housing
Airstream monitoring leaflet