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Vacuum Start Switch Calibration (Type C1 only)
A Type C1 biosafety cabinet operating in B-mode must sense sufficient remote exhaust
volume before starting the internal blowers. This is accomplished with the Vacuum
Start Switch (VSS) located in the exhaust housing of the biosafety cabinet. After setting
the Filter Life Gauge, or calibrating the Airflow Sensor (if present), a Type C1 biosafety
cabinet will ask if the VSS needs to be calibrated.
The VSS is factory calibrated, and should not need recalibration. If the biosafety
cabinet fails to start its internal blowers on demand, and an Exhaust Failure Alarm is
displayed after the Exhaust Airflow Check fails, the VSS may need to be recalibrated if it
has been determined the remote exhaust system is pulling the correct airflow volume.
To reach the VSS calibration screen, access the Calibration submenu as described in
Adjusting the Blower Speed earlier in this section. Pass through the Blower Speed,
Filter Life, and (if present) Airflow Sensor Calibration screens using [OK/MUTE].
If not recalibrating the VSS, select No on the screen below and press [OK/MUTE]. To
recalibrate the VSS, select Yes on the screen below and press [OK/MUTE]. Follow
these instructions:
1. Identify the VSS and Inlet Relief Valve atop the cabinet, see Figure 9-3. The Inlet
Relief Valve is a clear flap; the VSS is a black cube with clear hose protruding.
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