Work explanation models

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FL 101 – Fume cupboard exhaust air flow alarm system

The fume cupboard is equipped with a flow sensor installed on the side or top of the fume cupboard and with a monitor mounted on the side of the lift sash on the front side. When the air flow falls below the set limit (e.g. 0.5 m/s), the alarm alerts with sound and light signals.

FL 105 Digital adjustment system for the fume cupboard

The adjustment system maintains a constant sash opening air flow and, when the sash is raised, adjusts it above the set value (0.5 m/s) in two seconds. This ensures safe working. The position of the sash is measured using an electric potentiometer (FHL95) and the sash opening air flow is monitored with a speed sensor (HPS 50). The system conveys information about the operation of the fume cupboard to the user, for example warning of malfunctions with light and sound signals.

If desired, the energy saving of the fume cupboard can be enhanced by installing a presence sensor (IR 50) in the system, with which information about the employee’s presence is transmitted to the control system.

The controller (FHR 310) uses the above-mentioned messages when adjusting the air flows with the help of the control damper (FHD). The control damper is linearized and the control motor is integrated into the structure. The first adjustment of the air flow in the fume cupboard is done quickly according to the position of the sash. Another focus adjustment takes place at the same time based on the speed measurement. The system adjusts the exhaust air damper while keeping the sash open at the desired air flow (usually 0.5 m/s). The system is learning: it remembers the focus adjustments it made and uses them later. It is also able to take into account the individual characteristics of the fume cupboard and ductwork.

FL 205 Control of air flows in the laboratory space

The control data for the exhaust air flow needed to adjust the supply air flow and pressure ratios is obtained directly from the draft cupboard controllers (FHR 310) to the room controller (SAR 410). There is no need to measure the exhaust air flow in the duct, because the air flow information is obtained from the control electronics of the fume cupboard. If you want to connect other target outputs to the system, they can be programmed separately into the room controller. Information about the position of the target removal (open/closed) can be transmitted to the controller by, for example, limit switches. The air volume of target exhausts can also be measured with a measuring device (AVM / FMS + PSV 10).

The room controller (SAR 410) can be connected to building automation systems and transfer information about laboratory air flows and alarms to them. Basic settings, such as air flow settings, cannot be changed from outside the system for safety reasons.

The room controller (SAR 410) adjusts the room’s pressure conditions, temperature or CO2 concentration with the help of ventilation.

The supply air flow is measured AND regulated by the IMS control damper (ACU), which has a maximum open-close run time of 3 seconds. The control damper is linearized and the control motor is integrated into the structure.

FP 301 Monitoring system for laboratory pressure conditions

FP 302 Laboratory pressure ratio control system

The pressure difference between the room and the corridor is measured with an automatically calibrated piezoresistive membrane sensor (RP-CS). The display unit (RP-CI) installed in the room or corridor shows the prevailing pressure difference. Several display units (RP-CI) can also be connected to the system. The regulator adjusts the pressure difference as desired with a control damper (ECD) located in the inlet or outlet air duct, the travel time from one extreme limit to the other is a maximum of three seconds. The control damper is linearized and the control motor is integrated into the structure. When the pressure drops or rises below or above the set limit, the monitoring system alerts with sound and light signals. The system can be connected to a door opening limit switch that stops the adjustment while the door is opening. Alarm and pressure data can be transferred to building automation systems.

FP 303 Laboratory pressure ratio control system

The pressure difference in the room is measured in the corridor with an automatically calibrated piezoresistive membrane sensor (RP-CS) and a monitor installed in the room or corridor (RP-CI) shows the prevailing pressure difference. Several display units (RP-CI) can also be connected to the system. The controller adjusts the pressure difference as desired using the laboratory air flow control system (FL 204). When the pressure falls or rises below/above the set limit, the monitoring system alerts with sound and light signals. The system can be connected to a door opening limit switch that stops the adjustment while the door is opening. Alarm and pressure information can be transferred to building automation systems.

FP 304 Hospital pressure ratio control system

The pressure difference between the room and the corridor is measured with an automatically calibrated piezoresistive membrane sensor (RP-CS) and the display unit (RP-CI) installed in the room or corridor shows the prevailing pressure difference. Several display units (RP-CI) can also be connected to the system. The regulator adjusts the pressure difference as desired with a control damper (ECD) located in the inlet or outlet air duct, the travel time from one extreme limit to the other is a maximum of three seconds. The control damper is linearized and the control motor is integrated into the structure. The pressure setpoint can be changed with the key switch as desired (over or under pressure). When the pressure drops or rises below or above the set limit, the monitoring system alerts with sound and light signals. The system can be connected to a door opening limit switch that stops the adjustment while the door is opening. Alarm and pressure information can be transferred to building automation systems.

FP 305 Pressure ratio control system for laboratory space

The exhaust air flow control information needed to adjust the supply air flow and pressure ratios is obtained directly from the draft cupboard controller (FHR 310) to the room controller (SAR 410). If you want to connect other target outputs to the system, they can be programmed separately into the room controller. Information about the position of the target removal (open/closed) can be transmitted to the controller by, for example, limit switches. The air volume of target exhausts can also be measured with a measuring device (AVM / FMS + PSV 10). The intake air flow is measured and adjusted with the IMS control damper (ACU). The SAR 410 room controller adjusts the room’s pressure ratios based on the measurement data of the aforementioned exhaust air flow and supply air flow.

In order to take into account the variation in the pressure levels of the surrounding rooms, a pressure transmitter (PSV 10) is connected to the system, which measures the room’s pressure in relation to the reference room. The regulator (SAR 410) adjusts the intake air IMS control damper (ACU) based on the pressure sensor. If there are also fume cupboards in the room, it is recommended to use the IMS control damper (ACU) for the general exhaust to speed up the control. The system can be connected to a door opening limit switch that stops the adjustment while the door is opening. A pressure display unit (RPI 20) can also be connected to the system. All control dampers are linearized and the control motors are integrated into the structures.

The system can be connected to building automation systems and transfer information about laboratory air flows, room pressure and alarms to them. For security reasons, the basic settings cannot be changed from outside the system.