FVC2100/2200 TEK-AIR TECHNICAL PRODUCT DATA SHEET FUME HOOD FACE VELOCITY MONITOR AND CONTROLLER. Application. General Description

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1 TEK-AIR TECHNICAL PRODUCT DATA SHEET FVC2100/2200 FUME HOOD FACE VELOCITY MONITOR AND CONTROLLER MODEL 2100: Constant face velocity, variable volume MODEL 2200: Constant face velocity, variable volume with volume sensing Utilizes thermal sensing technology, microprocessor based electronics and linear air control valve to monitor and control fume hood face velocity. Measures and maintains face velocity Ensures operator safety Conserves energy Improves fume hood performance User selectable control features Communicates with Building Automation Systems Application Operators and planners associated with laboratory facilities must focus on two concerns unique to that environment: fume hood operator safety and the high energy cost associated with discharging large volumes of exhaust air from fume hoods. Tek-Air Systems addresses these concerns with the FVC2100/ 2200, representing the latest in fume hood control technology. The FVC2100/2200 is a high performance controller capable of instant response to changes in sash opening and air handling systems. Unlike systems that rely on sash position for control, the FVC2100/2200 uses face velocity for measurement, monitoring, alarm, and control functions. The FVC2100/2200 is a true "closed loop" control system providing speed and accuracy, key to ensuring worker safety and energy savings. Safety The FVC2100/2200 provides both audible and visual alarms at the fume hood. Because tests have shown that toxic fumes can only be contained when hood control response is immediate, the FVC2100/2200 has been designed to re-establish face velocity to OSHA limits within one to three seconds. Energy Conservation As the FVC2100/2200 resets air volume in response to sash position changes, energy conservation is maximized by sash closure. Because the FVC2100/2200 is capable of communicating digitally with central building monitoring systems, hoods with excessive exhaust airflow volumes can be detected.. Further energy savings are possible with an "unoccupied" face velocity setback feature using a communications link or by adding a simple dry contact into the controller digital input. General Description For basic constant velocity fume hood control using face velocity measurement, Tek-Air recommends Model FVC2100 or FVC2200. The two systems utilize identical components with the exception of duct exhaust volume sensing equipment added to the FVC2200, to provide flow limit control. Tek-Air's VorTek airflow traverse probes provide volumetric measurement in that application. Both systems provide face velocity control using the "side wall sensing" method. The basic system consist of a controller, sensor probes, display unit, electronic to pneumatic converter, and exhaust air control valve (see Figure 1). The controller is typically wall-mounted above the fume hood. The thermal face velocity sensor in the controller connects via PVC tubing to the hood probe mounted on the inner sidewall of the fume hood and the room reference probe mounted outboard of the hood interior. Optional VorTek traverse probes mounted in the duct between the hood and air valve (Model 2200) provide flow limit control by measuring the volume of air being exhausted. An accessory, hand-held configuration tool is required to configure the controller operation. True Distributed Control The key word in industrial control is "distributed". The FVC2100/2200 is a fully distributed microprocessor-based controller operating independently of other airflow and temperature controls in the lab. Each system is dedicated to the control of a single hood, providing control distribution for maximum operator safety. Speed The FVC2100/2200 scans the face velocity, performs control equations, and updates outputs 5 times per second to eliminate control lags. Stability Turbulence created by movements of the operator working at the face of the hood can cause control instability and damper oscillations. These oscillations can contribute to the wear and tear on the system components. The FVC2100/2200 has been programmed with a control algorithm developed by Tek-Air, which minimizes instability without sacrificing the quick control response required by fume hood applications. This algorithm is adjustable to facilitate use with a variety of dampers and motor speed controls.

2 Principle of Operation The FVC2100/2200 consists of seven basic elements: (see Figure 1) 1. Hood and room reference sensor probes 2. Controller with internal face velocity sensor 3. Display 4. Electronic to pneumatic converter 5. PRD exhaust air valve 6. Optional VorTek airflow probe (Model 2200) 7. Configuration tool (not shown) In simple terms, the desired face velocity setpoint is pre-established and programmed into the controller. The exhaust fan draws air through the open sash area and room reference sensor probe. Air drawn through the probe passes through the face velocity sensor in the controller housing where it is measured and reported to the controller, then exhausted through the hood sensor probe and out through the duct. The controller compares the measured face velocity against the setpoint and adjusts the air valve accordingly to maintain the desired face velocity. To understand the FVC2100/2200, one must look in greater detail to each of the elements of the system. Hood and Room Reference Sensor Probes Two sensor probes are supplied with each system. On larger hoods, two interior probes can be used for improved averaging. The 90 hood probe is mounted through the inner sidewall of the fume hood to provide an interior pressure reference. The straight room reference probe is typically mounted in close proximity to the fume hood to provide a room pressure reference. The probes connect to the controller by means of 1/2" O.D. PVC tubing (20' max. length between probe and controller). (see Figures 10, 11, & 12) Figure 1 - Operation and typical installation of FVC-2000 model 2100, and 2200 with VorTek the indication of direction of flow as well as rate of flow. Air flowing across the dual elements carries heat away from the first Permalloy sensor, thereby cooling it and reducing its electrical resistance. Before the air reaches the second sensor it is warmed by the heating elements and is transferred to the second sensor. The temperature variation between the two sensors gives rise to a measurable resistance difference proportional to the airflow velocity. This design ensures sensor stability and allows the FVC2100/2200 to maintain accurate control. Application Review To insure proper application, your local Tek-Air dealer can view each fume hood and recommend the appropriate probe location. This review procedure insures proper operation on most fume hoods, regardless of type, width, or sash style. The Controller Thermal Anemometer Face Velocity Sensor The FVC2100/2200 utilizes a thermal mass flow sensor (wind velocity sensor) to measure low-speed face velocity, normally in the range of 60 to 120 fpm (about one mile per hour). The thermal sensor is bi-directional and so, is capable of sensing flow in and out of the fume hood. Bi-directional sensing provides the ability to detect reverse flow through an open sash into the room or a zero airflow condition. Anything in the building that would contribute to a drop in face velocity at the hood will be sensed and put the system into alarm. The sensor utilized in the FVC2100/2200 is especially suited for fume hood face velocity measurement. The sensitive, fast response operation of the Thermal Mass Sensor relies on the extremely low heat capacity of unsupported thin film (see Figure 2). Dual Permalloy temperature sensing elements, flanked by heating elements, allow Figure 2 - Thermal Mass Flow Sensor Operation The FVC2100/2200 utilizes an industry standard 4-20 ma analog output signal for modulating the final control device. It is compatible with most variable frequency drives, electronic to pneumatic converters, and electric actuators. The controller uses a relay dry contact for alarm output. Both visual and audible alarms are activated when the face velocity is not within the desired high and low setpoints.

3 Figure 2 - Fume Hood Display Face Audible Alarm Beeper Sounds when face velocity falls outside High or Low setpoints. Normal Green LED will be illuminated during normal hood operation. Alarm Red LED will flash during an alarm condition until the Mute button has been pressed. Then it will become continuous. Mute Button Acknowledges alarm when pressed, silences audible alarm. Also used to perform self test. Numeric and Alpha Display Displays status and values. Emergency Red LED will illuminate after the Emergency button has been pushed. Emergency (Purge) Button Over-rides control and modulates exhaust air valve to 100% open. Pressing again returns to normal control. Parameters Button Scrolls through list of control parameters. Inputs Using industry-standard modular plugs and cable, the FVC2100/2200 has additional sash sensor inputs that allow interfacing with a variety of sensors designed for fume hood control. This capability can be utilized to input and display exhaust volumes measured by devices such as Tek-Air's VorTek Airflow Traverse Probes (Model 2200). Modular connection points are also provided for the configuration tool and the fume hood display. The Fume Hood Display (see figures 1, 3 & 13) The FVC2100/2200 display is normally mounted on the left or right front panel of the fume hood where it can best aid the operator in the safe operation of the hood. The display mounts on a standard switch box installed behind the front panel. Simple Operation The display window and associated audio and visual alarm indicators instantly advise the operator of any unsafe face velocity conditions at the hood. LEDs and manual controls are easy to read and simple to operate. (see Figure 3) Normal conditions are indicated by an illuminated green LED and a 'norm' (normal) message displayed in the LCD window. Short periods of low face velocity, usually induced by moving the hood sash quickly, will cause the alarm indicator to blink and the digital display to show 'ALrt' (alert). If the alarm delay time is exceeded, the audible alarm will sound, the appropriate alarm LED will light, and 'Hi' or 'Lo' will be shown on the digital display, depending upon the alarm condition. (see Figure 3) The display window also indicates the face velocity in feet per minute (fpm). Setpoints for control, low alarms, and high alarms are also displayed in fpm. All readings and settings are available for the operator review via the display and keypads. Because accidents can occur within the hood, an emergency override button is provided on the display face. When pressed, automatic control of face velocity is suspended and the exhaust air valve is opened to provide for maximum exhaust volume, purging the hood. Optional VorTek Volumetric Control Capabilities Tek-Air's VorTek Airflow Traverse Probes provide volumetric sensing capabilities with the Model The VorTek airflow measuring system consists of multi-sensor probes which are inserted in the ductwork between the fume hood and the air valve. (see Figures 1, 16, 17, 18) VorTek sensing provides pulse type electronic output signals which have a frequency that is directly proportional and linear to the airflow velocity. These digital pulses from each sensor are totalized in the FVC2100/2200 controller. By providing true velocity averaging, exhaust volume is accurately measured and the value can be viewed in the display window. Volumetric Limit Controls The FVC2100 and the FVC2200 differ in how they limit the maximum and minimum exhaust air volume through the fume hood: FVC2100 Maximum and/or minimum volumes are controlled by setting fixed position limits for the opening and closing of the air valve. (see Figure 5) FVC2200 Exhaust volume limits are maintained by actively measuring the volume and controlling the air valve to insure that maximum and minimum volume limits are not exceeded. (see Figure 6) Duct pressure gradients are typical in the exhaust extraction duct system of large buildings. As fume hood usage patterns change throughout the day, the duct static pressure on the outlet of the fume hood control valve will change.

4 In the Model 2100 the volumetric flows at the maximum opening and minimum closure for the exhaust valve are related to static pressure, so the exhaust valve is "pressure dependent". A 25% change in static therefore will result in a 13% change in flow through the valve at either the minimum closure or maximum opening position. As a result, flow limits provide coarse control in terms of cfm. The Model 2200 uses VorTek to provide minimum/maximum volume limits to face velocity control. With VorTek sensing added as an option, minimum and maximum volumetric limits are established in the controller. Face velocity is the primary control parameter when the exhaust volume is greater than the minimum limit and less than the maximum. If the face velocity control software attempts to increase the volume above the maximum volume limit in response to duct pressure changes, the maximum volume becomes the primary controlling parameter. If the face velocity attempts to set the volume below the minimum setpoint, then the minimum cfm becomes the primary controlling parameter. (see Figure 6) The VorTek sensor is typically provided with CPVC materials for fume hood service. The sensor may incorporate up to four sensing points; typically either one support bar with one, two, three, or four sensors; or two support bars with two sensors each. The exact probe configuration is determined by the duct area and cfm. The VorTek assembly connects to the controller via modular cable. FHT7000 Configuration Tool User Configurable Research facility managers have individual preferences regarding fume hood control features. For this reason, the FHT7000 is designed to be user configurable. The user is able to modify the control mode to meet the ever changing needs of facility and staff. A password function is provided to protect against un authorized tampering with the controller. FHT7000 Figure 7 - FHT7000 Configuration Tool The FHT7000 Configuration Tool is a hand-held device used to configure the operation of the fume hood controller. (see Figure 7) The tool is menu driven, and incorporates a 4-line, 16 character per line, LCD window. The user can easily connect the tool to the fume hood display or directly to the controller. Figure 5 - CFM Limits Set by Max./Min. Valve Position (Model 2100) Figure 8 Setpoint and Configuration Adjustments Available via Configuration Tool Communications Figure 6 - CFM Limits Set by VorTek (Model 2200) Password Face Velocity Setpoint, Normal Face Velocity Setpoint, Setback Hi Face Velocity Setpoint Lo Face Velocity Setpoint LoLo Face Velocity Setpoint Maximum Valve opening Minimum Valve Closure Alarm Mute Control Display Configuration, Alpha or Numeric Alarm latching Configuration Remote Reset Selection Remote Emergency Selection Minimum Exhaust CFM (Model 2200 only) Maximum Exhaust CFM (Model 2200 only) Communications Parameter Control Face Velocity Calibration Exhaust Volume Calibration (Model 2200 only) Dedicated Fume Hood Network Each FVC2100/2200 controller is provided with a serial communications interface. This interface provides the ability to network up to 243 controllers to a central location. Information is available on the performance of each controller throughout the network. Controller information available via the network is listed in Figure 9. Information which is listed as Read/Write can move in both directions along the network provided the individual controller has been configured to receive data. This capability also allows for remote setpoint reset.

5 Figure 9 Communications Parameters Parameter # - Description Read or Write Definition 0 - Face Velocity read 0 to 1000 fpm 1 - Face Velocity Setpoint read/write 0 to 1000 fpm 2 - Controller Output to the Valve read 0 to 100% 3 - FV Hi Alarm Setpoint read/write 0 to 1000 fpm 4 - FV Lo Alarm Setpoint read/write 0 to 1000 fpm 5 - FV Hi Alarm Status read 1=alarm, 0=no alarm 6. FV Lo Alarm Status read 1=alarm, 0=no alarm 7. FV LoLo Alarm Status read 1=alarm, 0=no alarm 8. Local Emergency Override (status) read 0=normal, 1=emergency 9. Remote Emergency Override read/write 0=normal, 1=emergency 10. Airflow Volume read 0 to 5000 cfm 11. FV LoLo Alarm Setpoint read/write 0 to 1000 fpm 12. not used 13. not used 14. Same as 10 read 0 to 5000 cfm 15. Airflow Volume Setpoint read/write 0 to 5000 cfm 16. AF Hi Alarm Status read/write 0 to 5000 cfm 17. AF Lo Alarm Status read/write 0 to 5000 cfm 18. AF Hi Alarm Status read 1=alarm, 0=no alarm 19. AF Lo Alarm Status read 1=alarm, 0=no alarm 20. Day/Night Reset (dig input) read/write 1=night, 0=day 21. Face Velocity Reset Setpoint read/write 0 to 1000 fpm 22. Airflow Volume Reset Setpoint read/write 0 to 5000 cf Figure 10 - Controller Connection Diagram Figure 11 Face Velocity Probe Mounting and Tubing Detail CAUTION: Do not install the ceiling probe in the airstream of supply diffusers. Figure 12 Room Reference Probe Mounting and Tubing Detail Figure 13 Fume Hood Display Mounting

6 Figure 14 Controller Mounting and Tubing Detail Figure 15 Controller Connection Diagram Figure 18 Rectangular Duct Showing VorTek Airflow Traverse Probes (Model 2200) Figure 19 Round Duct Showing VorTek Airflow Traverse Probes (Model 2200)

7 Fume Hood Controller FVC-2100/2200 Figure 20 - PRD (model PVP4000) with Circular Inlet and Outlet, and VorTek Sensor (Model 2200) Specifications FVC2100/2200 Power VAC +/- 20%, 10 VA max. Display LCD /2 Digit Dimensions... 5 in. x in. x 1.5 in. Keypads... Mute, Parameters Emergency (purge) LED Indicators Normal... Green Alarm... Red Emergency (purge)... Red Face Velocity (Models 2100& 2200) Range... 0 to 1000 fpm Resolution... 5 fpm Accuracy... +/ fpm Low Alarm Setting... 0 to 500 fpm High Alarm Setting to 1000 cfm Alarm Delay... Adjustable, 5 to 30 seconds Airflow Volume (Models 2200 only) Range... 0 to 5000 cfm Resolution... 1 cfm Accuracy... +/- 1.5% Rate +/- 0.5% FS Outputs Control ma, 500 ohms max. Signal ma, 500 ohms max. (options: Face Velocity, Volume) Alarm... SPDT Relay, 0.5 amps max. Communications...RS-485, 2-wire Tek-Air Open Protocol; JCI Metasys 9600 bps *ARCnet 625 kilobits/sec. FVC2100 Model Code T FVC21 Basic Model Includes: Controller, Tubing, Display & Cable Communications 1 - ARCnet (SmartLab) 2 - Open Sensor Quantity 1 - (1) Sidewall, (1) Reference 2 - (2) Sidewall, (2) Reference FVC2200 Model Code T FVC22 Basic Model Includes: Controller, Tubing, Display & Cable, VorTek Input Board Communications 1 - ARCnet (SmartLab) 2 - Open Sensor Quantity 1 - (1) Sidewall, (1) Reference 2 - (2) Sidewall, (1) Reference NOTE: Consult your local Tek-Air representative for further information. ( for your local representative listing please visit our web site at ) All specifications are subject to change without notice.

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