Automatic or individual splitting of room supply and exhaust air volumes when several regulators of the same type are used. Key features of the EASYLAB system include improved volume flow rate balancing for all types of room scenarios and volume flow rate regulation of fume hoods.
Areas of application
There is also a tendency to use the damper blade positions of the VAV terminals as selective point signals to determine the required fan speed or duct pressure. When developing the EASYLAB operating mode concept, a primary goal was to make the system easy to use and provide versatile setting options for different project requirements.
Components and expansion options
Control panel for fume cupboards (BE-SEG-02) Control panel for status display and operating mode default setting; includes an OLED display for fume hoods according to EN 14175. Customizable control panel for status display and operating mode default setting for fume hoods according to EN 14175.
Room control panel
Overall system advantages
Operating modes and room control strategy
Some fume cupboard controllers may override the default operating mode setting (due to configuration or because manual control is active). Some fume cupboard controllers may override the default operating mode setting from the central BMS (depending on configuration).
Room management function (RMF)
Interface to the central BMS
Due to the new communication system, installation and commissioning require much less time and effort than with previous systems. Network Management Tool-Free Startup When components are connected via a plug-in communication cable and power is supplied, room controllers and TAM automatically communicate and exchange data. The use of a network management tool such as Echelon LonMaker is only required for the communication interface with the central BMS.
The software for configuring controls with regard to commissioning, maintenance and diagnosis is also a completely new development. The typical work sequences for commissioning and maintenance are broken down into smaller steps, which users can follow intuitively. Activate the room management function, configure room parameters and perform commissioning test for room functions (interactive software).
Design basics
Fume cupboard control
Retention
Air change
Splash and shatter protection
Two-point or three-point control with switch contacts - Variable volume flow control based on sash distance. The control system reacts to fluctuating pressure in the duct and adjusts the volume flow accordingly, quickly and precisely. For fume cupboards where the volume flow should vary with the distance of the wings, different levels of exhaust air volume flow can be achieved with this strategy.
Frame distance sensor – linear control strategy One option is a linear change of the volume flow rate between two adjustable values based on the window frame opening as measured using a window frame distance sensor. All openings of the fume hood are monitored, and the face velocity set during commissioning (usually 0.5 m/s) is maintained in the range between the minimum and maximum volume flow rates. With this variant, the face velocity transducer detects increased thermal loads within the vapor box so the controller can increase the volume flow rate to safely dissipate the thermal loads.
Additional functions
Volume flow controllers with an analog output of the actual value (0-10 V DC), such as those for hoods or extraction arms, can be integrated into the fume hood. Depending on the configuration, the flow rates are interpreted as extract air or supply air and are included in the total extract air volume flow or the total supply air volume flow. Constant volume flows can be signaled to the fume cupboard controller with switch contacts.
Depending on the number of special functions used, up to five switching inputs are available on each fume cupboard controller. Control panels for fume hoods according to EN 14175 EASYLAB does not stop at volume flow control; it includes control equipment, the (acoustic or optical) signaling of alarms and equipment for expansion. Functions for activating the fume cupboard lighting, controlling an automatic sliding device and displaying service intervals are also available.
Fume cupboard control • application examples
Application example 2: Several fume hood controllers with TROX adapter module TAM as central interface point. Operating modes and special fume hood control functions can be adjusted using the control panel. Fume hoods and the blow-in regulator allow additional volume flow rates to be signaled using 0 – 10 V signals or switches.
If the room management function is active on the TROX adapter module, centralized signaling of the default operating mode is possible with the room control panel. Operating mode defaults, actual volume flow values and consolidated alarms can be exchanged over the network. TVLK ELAB / FH-VS / Z / min – mₐₓ VAV connection unit type TVLK and fume cupboard controller with face speed converter and with the following equipment: housing, solenoid valve, supply voltage 24 V AC.
Control strategy for supply air and extract air
Room control
Additional room control functions
Room control • application examples
Fume cupboard controller with a supply air controller
Fume cupboard controller with an extract air controller
Fume cupboard controller with supply air and extract air controllers
Example 4: Fume hood regulator with supply and exhaust air regulators, with RN regulators and fume hoods. The minimum total exhaust air set in the design phase cannot be completely ensured by the exhaust air volume flow of the fume hoods. Depending on the operating situation of the fume hoods, the exhaust air regulator increases or reduces the amount of exhaust air.
The EASYLAB supply and exhaust air controllers are integrated at any point with the help of the communication cable. A total of 24 controllers can be interconnected, for example up to 22 fume cupboard controllers can be combined with one exhaust air controller and one supply air controller. VAV terminal unit Type TVR and supply air controller with the following equipment: 24 V AC supply voltage, solenoid valve for automatic zero point correction.
Room pressure control
EASYLAB allows room pressure values to be configured on the controller with room management. Room pressure control with clear status display The room control panel BE-LCD-01 is ideally used for room pressure control. The control panel shows the operating mode and the actual value of the room pressure, as well as the corresponding setpoint value, and gives an optical and acoustic alarm in the event of an unacceptable deviation.
The installation details for regulators must always be observed, especially in the case of room pressure regulation. EASYLAB lets you switch from volume flow rate control to pressure control at a later stage without the need to change any regulators. What is required is the addition of a room pressure transducer and room pressure control must be enabled in the regulator configuration.
Room pressure control • application examples
FMS-1: Monitoring system with integral diaphragm pressure transducer and measuring probe (part of supply package) for differential pressure or volume flow rate monitoring. Device function Differential pressure, internal measurement: Measurement of differential pressure at a suitable measuring point using an internal static differential pressure transducer. Device function Differential pressure, external measurement: Measurement of the differential pressure at a suitable measuring point using an external differential pressure transducer.
The BE-SEG-03 standard control panel indicates whether the volume flow rate, differential pressure or face velocity being monitored has actually been reached. OLED display for face rate, volume flow rate, differential pressure and system information – Buttons for automatic band device Configurable control panel functions. OLED display for volume flow rate, differential pressure and face velocity current values (BE-SEG-02 only) BE-SEG-02, BE-SEG-03.
Design criteria for the room
Supply air systems for laboratories must be equipped with filters that keep the dust concentration in the room air low. If air pollution is not removed at the source, the ventilation system can only achieve a dilution of the pollution. This is why the supply air distribution is important as mixed flow ventilation prevents an accumulation of hazardous substances.
To prevent turbulent air in front of the fume cupboard from causing the release of hazardous substances, suitable air terminal devices should be included in the design.
Acoustic requirements for the room
Design criteria for control components
Design criteria for commissioning and maintenance
Construction of the VAV terminal unit (material) - Connection dimensions of the VAV terminal unit - Accessories, if any, for the VAV terminal unit.
For detailed descriptions regarding the constructions and accessories for each VAV terminal unit, refer to the technical brochures. TVLK and TVRK for the units made of plastic, and TVR · TVT · TVJ · TVZ · TVA · TZ-Silenzio · TA-Silenzio · VMR · VMRK for the types made of galvanized sheet steel. Each VAV terminal unit is available for different volume flow rate ranges and in different sizes (connection dimensions).
EASYLAB
EASYLAB fume hood controller with front speed transducer, fast-running actuator and expansion modules for 230 V AC mains supply, automatic zero point correction and light connection plug. EASYLAB fume hood control with frame distance sensor and fast-running actuator Linear control strategy. Control panel for fume cupboard controller, for displaying the functions of the control system in accordance with EN 14175 BE-SEG-** OLED display.
The type test of a fume hood according to EN 14175 is carried out in a test chamber and leads to volume flow values that are binding for this type of fume hood. As an alternative to the tests specified in 5.3, it is possible to test the VAV system together with a fume hood instead of the test box..'. In practice, this means that a test of the VAV system can be carried out either with the test box or with a fume cupboard.
Standards and guidelines that apply to laboratories
Universiteite en kolleges Aken, Bochum, Bonn, Braunschweig, Bremen, Chemnitz, Cottbus, Dortmund, Dresden, Freiburg, Greifswald, Halle, Hamburg, Hanover, Homburg, Jena, Keulen, Leipzig, Magdeburg, Mainz, Münster, Oldenburg, Potsdam, Rostock , Tübingen, Würzburg. Universiteitshospitaal, Aken Universiteit Hospitaal, Essen Industrial and TechnologicalAbbott, Ludwigshafen Aldrich Chemie, Steinheim ALTANA BYK-Chemie, Wesel Asta Medica, Mainz BASF, Ludwigshafen BAT, Bayreuth Bayer AG,. Navorsingsinstitute AFSI Forensic Science Institute, Algiers, Algerië Institut de Chimie, Neuchâtel, Switserland Nano-gebou, Helsinki, Finland.
Pharma Baranzate di Bollate, Milan, Xaaliyaanii Eli Lilly, Florence, Xaaliyaanii Euroforum, Luxembourg Galderma, Faransaay Henkel, Shaangaayi, Chaayinaa HTX Randers, Deenmaark. Lab Chiron, Siena, Xaaliyaanii LEO Pharma, Deenmaark L'Oréal, Paaris, Faransaay Odense Marzipan, Deenmaark Merck, UK. Utrecht, Netherlands Swords LAB, Dublin, Ireland Techcenter Reinach, Basel, Siwiizarlaand UMG KRC, Zagreb, Kirooshiyaa Wolfson Laboratories, Landan, UK.
