Technical News

CETA Service Updates for 2014

April 2014

NuAire attends, participates, and sponsors the annual Controlled Environment Testing Association (CETA) meeting on an annual basis. Below are current highlights of NuAire's presentations during CETA.

  • Explanation of new Ultra Violet (UV) retrofit kits
  • Explanation of new FlowGard / digital manometer upgrade kits
  • Upcoming GAF III board
  • New air flow probe for TouchLink system and instructions on installation
  • New TouchLink color display and software version
  • How to update new and old TouchLink main control boards
  • Uploading historic dates
  • New BACnet capabilities
  • Updated variable transitions (VFC) NU-911, NU-921
  • LabGard ES NU-813 Class I Biological Safety Cabinet updates
  • Maintenance procedures for Biological Safety Cabinets and Animal Transfer Stations
  • New Compounding Aseptic Containment Isolator NU-NR797 design

Download presentations for NuAire product update below

  • PDF Version Click Here
  • PPT Version Click Here
  • CETA Service Updates for 2013

    April 2013

    NuAire attends, participates, and sponsors the annual Controlled Environment Testing Association (CETA) meeting on an annual basis. Below are current highlights of NuAire's presentations during CETA.

    • Explanation of new Ultra Violet (UV) retrofit kits
    • Explanation of new FlowGard / digital manometer upgrade kits
    • New TouchLink Electronic Control System (ECS) Display and software version
    • How to update new and old TouchLink ECS main control boards
    • Uploading historic date
    • New BacNet (Building Automation Control Network) capabilities
    • Updated Variable Airflow Transitions (VFC) NU-911/912
    • LabGard Model NU-813 Class I Biological Safety Cabinet updates
    • Reminder of maintenance procedures for Biological Safety Cabinets and Vivarium Animal Transfer / Cage Changing Stations
    • New PharmaGard Model NU-NR797 Compounding Aseptic Containment Isolator (CACI) design

    Download the PowerPoint presentation for NuAire product updates click here.

    CETA Service Updates for 2012

    April 2012

    Every year NuAire attends, participates, and sponsors the annual Controlled Environment Testing Association (CETA) meeting. Here are some highlights and presentations made by NuAire.

    • New A2 Biosafety Cabinets
      • CellGard ES HD 481
      • CellGard ES HD 481 HEPA filter integrity testing
    • Electronically Commutated Motor (ECM) Updates
    • Airflow board updates for Essentials, FlowGard, and TouchLink control systems
    • Canopy Exhaust Transitions
    • Variable Flow Canopy (VFC)
    • Updates to LabGard NU-602 lift system
    • AllerGard NU-612 / 617 / 619 preventative maintenance
    • PharmaGard 797 maintenance, retrofit kits, and upgrades
    • LabGard NU-430 Class II, Type B2 Biosafety Cabinet new features
    • LabGard NU-427 Class II, Type B1 Biosafety Cabinet new features
    • Pressure switch retrofit VACS replacement install
    • Updated and new technical bulletins

    Download a PowerPoint presentation for all product updates here.

    NuAire PharmaGard Isolator CAG-002-2006 Testing
    Presentation: CETA_April_2012.ppt

    CETA Service Updates for 2011

    May 25 2011

    NuAire recently attended the CETA North American conference. The following is a list of changes to NuAire laboratory products.

    Download the presentation now.

    NU-425 with DC-ECM Motor

    Nov 23 2010

    NU-425 Series 60 and above comes standard with a PSC (AC) motor. The NU-425-300/400/500/600 models can also be purchased with an optional DC-ECM motor. Series 20 and higher field units can also be upgraded with a DC-ECM retrofit kit.

    The DC-ECM motor has many features that make it a good choice for customers. This article describes the DC-ECM motor features and how to control it.

    Download the article now.

    Airflow Calibration of the Labgard ES 437 (Series 60 & Up)

    Jan 13 2010

    With the introduction of DC motors into NuAire’s Biological Safety Cabinets, procedures for the calibration of airflows have changed on some models. The NU-437’s (A2) new main control board now has the ability to control either an AC or DC motor. With the AC motor you adjust the potentiometer located on the main control board to increase/decrease blower speed. But with the DC motor it requires additional steps to make that adjustment.

    The DC-ECM system works like this:

    1. AC voltage is applied directly to the DC motor's control module.
    2. The motor control module (Microprocessor) converts the AC to DC for internal electronics and to power the motor.
    3. In addition, there is a second electrical cable that goes from the Main control board's speed controller output to the motor. This generates a pulse-width-modulation (PWM) 2.5-8 vDC control signal and returns an RPM feedback signal from the motor to the speed controller.

    Down-Flow Calibration (60+/-5 LFPM)

    1. Place an airflow velocity meter in the cabinet's work-zone and spot check several points on the recommended down-flow test grid.
    2. Enter the Airflow calibration mode:
      1. Press and hold the "Alarm Silence Key".
      2. Press FL light ON, light OFF and release the Alarm Silence key.
      3. The Outlet LED should blink and the blower will turn on.
      4. To increase the unit's airflow, press the "UV Key"; to decrease the airflow, press the fluorescent Light "ON" key. (This will change the PWM vDC signal to the motor).
      5. To exit calibration, press the "Alarm Silence Key" again.

    Calibration Tips:

    • While in airflow calibration mode, you can return to the original PWM signal (2.5 - 8 vDC) setting. Press and hold both the "FL Light ON" and the "FL Light OFF" keys simultaneously for 3 seconds.
    • Once the down-flows have been calibrated, you may move onto calibrate the in-flows.

    NOTE: Be sure to record the PWM signal vDC upon final calibration. This may be completed using a digital voltmeter connected to the DC motor connector on the main control board.

    Use the NU-437's test points to record the PWM vDC signal.

    Inflow Calibration (105+/-5 LFPM)

    1. If the measured inflow is less than 100 LFPM, adjust the internal choke. If the airflow is still insufficient, increase the PWM signal/VDC.
    2. If the measured inflow is greater than 110 LPFM, first adjust the PWM signal/VDC to achieve 1/2 of the excess airflow. Then adjust the choke to balance the airflow.
    3. Once the inflow adjustment is complete; return to the down-flow calibration, check average down-flow velocity and adjust as necessary.

    FlowGard Calibration

    Once the airflow calibration is complete, calibrate the FlowGard airflow monitor:

    1. Press and hold the "up and down" arrow keys simultaneously for 3 seconds until the center LED blinks.
    2. Allow the unit to run for a minimum of 2 minutes.
    3. Press Reset key to enter the nominal airflow value; the Green LED will stop blinking and display normally.

    This sets the high/low alarm limits +/- 0.13 w.g. from nominal.

    Reference the operating manual for your Labgard 437 for more in-depth information and calibration procedures. If you require help, or have questions, please contact NuAire's technical support department.

    DC-ECM Motor/Blower Assemblies in Biosafety Cabinets

    Jan 05 2010

    DC-ECM (Direct Current-Electronically Commutated Motor) Motors are now being installed in newly manufactured NuAire Class II, Type A2 Biological Safety Cabinets (Labgard NU-437/E/G, Labgard NU-440/E/G, and the CellGard NU-480/E/G). These DC-ECM motors are also available as an option for the Labgard NU-425/E/G product.

    NuAire is steadily phasing DC-ECM motors into most of our product lines. The DC motors have proven to be reliable, quiet, energy efficient, and generate less heat/vibration than AC motors. Please review the attached document that describes the DC-ECM motor characteristics, features and benefits.

    In addition, older model NU-425's (Series 20 and newer (1995+) ) can be retrofitted with the new DC-ECM motors. The Retrofit kits are RF515, RF516, and RF517. These kits are supported by technical bulletin STB0187. Contact your local Biological Safety Cabinet certifier or NuAire to discuss options for upgrading your existing Labgard 425 Class II, Type A2 biosafety cabinet.

    This new system, plus many other features, including the TouchLink Control Center, are part of NuAire's Certifier training class curriculum. Be sure to sign up for one of the classes scheduled soon.

    BSC Data Plate Information

    Oct 01 2005

    NuAire has produced a new data plate for its biological safety cabinets that conforms to the NSF/ANSI Standard 49-2008 format. Reference NuAire technical bulletin STB0139 for a detailed description of data plate information.

    The new BSC dataplate.

    The data plate includes, but is not limited to the following information:

    • Manufacturer
    • Model Number
    • Unit Serial Number
    • Series Number
    • Class/Type
    • Electrical Data
    • Window Type/Opening Size
    • Nominal Set Points/Method
      • Inflow
      • Down flow
    • Down flow velocity test grid
    • Secondary Inflow Method/Grid
      • Correction Factor
      • Set point

    Note: The 3 inch constricted method is the alternate means of measuring inflows for most NuAire biosafety cabinets. (See STB0115).

    Contact NuAire's technical service department for additional information.