Welcome to Specialty Solutions
The Specialty Solutions Safeguard Digital Airflow Monitor provides a real-time FPM (feet per minute) reading to indicate proper fume hood performance. This reading must be supported by initial air balancing and appropriate blower adjustment to ensure the hood is exhausting the designed CFM.
If the required FPM setpoint is unknown, please initiate a risk assessment in accordance with your facility’s procedure and consult with your Environmental Health & Safety (EHS) officer or safety officer.
Per ANSI/AIHA Z9.5 guidelines, the recommended average face velocity for laboratory fume hoods is typically 80-120 FPM, unless your risk assessment determines an alternative requirement.
Standard Installation Schematic of a Fume Hood:
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Programming Your Digital AFM
On all our fume hoods the low voltage plug in cable will be located in the punchout.
Specialty Solutions Safeguard Fume Hood Monitor – Installation and Operation
Start Up
The Safeguard must be field-calibrated after an HVAC professional balances the laboratory air supply and exhaust.
The monitor will not display a face velocity reading until a successful calibration is completed. Visit hollandsafety.com for a video tutorial.
Calibration
2. Using the +/- buttons, select SET UP, then select CALIBRATION, then enter the password (the default password is 0-0-0-0; press the ENTER button four times to proceed to the next step).
3. Open the sash to normal operating height and measure the face velocity with a calibrated instrument. Use the +/- buttons to input the measured value, then press ENTER and wait as the unit takes an air sample.
4. Lower the sash by half and again measure the face velocity with a calibrated instrument. Use the +/- buttons to input the measured value, then press ENTER and wait as the unit takes an air sample.
5. If calibration is successful, select DONE. You will return to the RUN/SET UP menu. Select RUN and the monitor will switch to normal operating mode, displaying the face velocity.
Troubleshooting
Sidewall Sensor Placement
Mount the monitor on the front of the fume hood and use the provided hose. For fume hoods with a single skin sidewall or a double skin with a small gap between them, it may not be possible to achieve the ideal sensing position using the provided hose. With a single skin sidewall, it is possible to fix the sensor on the outside of the fume hood and connect directly to the inner chamber in the ideal position. This method can only be used for up to two fume hoods when they are positioned side by side (using the two outer walls).
The sensor should not be mounted in a position where it is subject to drafts from the laboratory air input or ventilation system.
Screen Dimming
The Safeguard has a parameter that allows the screen to dim if the velocity reaches an established point. This saves power and prolongs the display life. The screen will return to normal brightness any time a button is pressed, if there is an alarm or if the velocity drops below the screen dimming set point. To adjust this parameter, press and hold the ENTER button to get to the RUN/SET UP screen. Choose SET UP, then choose CONFIGURE, then use the +/- buttons to scroll AUTO SCREEN DIM.
Connection Details
The in-line sensor must be positioned between the sidewalls.
The threaded bush crosshatch insert (G) is mounted through a 1-inch hole in the front post into the coupling (F). The hose (E) is a push fit into the rear of the coupling.
The other end of the hose is a push fit into the sensor body (D).
The 335 adapter (A/B) is fitted through the sidewall; part A is open to the working chamber while part B is connected between the inner and outer sidewalls. Cut a small section of hose (C) to be push fit into the sensor (D) and outside the 335 adapter (B).
The ideal position for the 335 adapter hole is 4 inches back from the sash glass and 4 inches higher than the normal sash opening through the inner sidewall.
