Chapter 6: Maintaining Your Filtered Enclosure

Setting the Inflow Face Velocity with the Speed Control Adjustment

1.Remove the front panel by loosening the (2) Phillips screws on top that secure the front panel.

2.The speed control is located on the electrical subassembly located behind the switched control panel and below the front panel. See Figure 6-1.

3.Adjust the speed control with a small Phillips screwdriver by turning the screw counterclockwise to increase blower speed or clockwise to decrease the blower speed. The speed control is very sensitive, so proceed with caution.

4.Measure the inflow velocity per the averaging technique outlined in Chapter 3 and adjust the speed control slowly for the desired speed. Allow the speed to stabilize and re- measure the inflow velocity to confirm.

5.Replace the front panel and tighten the screws.

Options

Calibrate and Operate the Airflow Monitor

Guardian Airflow Monitor (LED Monitor)

Refer to Figure 6-2 for operation and calibration.

Labconco Airflow Monitor / Airflow Switch Operation

The Guardian Airflow Monitor (LED) consists of a circuit board and an airflow switch. This switch indicates airflow as safe or low. It does not provide an actual face velocity, but a small setscrew in the back of the sensor can adjust the airflow level that it classifies as “good/safe” or “low/alert.”

The circuit board provides power to the sensor and also contains a “safe (green)” and “alert (red)” airflow LED indicators, as well as a “SILENCE ALARM” button to quiet the audio alarm. When first powered up, the PCB will light both red and green LED indicators and sound the alarm to indicate it is working. After 5 seconds, the air monitor will indicate either good or bad airflow based on what the connected airflow switch detects. For low airflow, the unit will wait for 10 seconds of bad indications before it sounds both the audio alarm and the red “alert” LED indicator. If

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Gentek 3980401, 3980423, 3980422, 3980200 Calibrate and Operate the Airflow Monitor, Guardian Airflow Monitor LED Monitor

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