OPERATOR'S MANUAL BIOPROtect II Vent to ... - Baker Company

Calibration procedure for Modus Airflow alarm(Digital Differential Pressure Monitor).Note: This procedure MUST be followed every time the damper width has been changed.Initial Set Point SettingsBalance the cabinet air flows to nominal operating set point per manufacturer instruction.( Seeinstruction label on front of cabinet).Record voltage to motor/blower (M1, M2 on speed control) and measure and record damper/ slotwidthMake certain that the Modus displays 0.000 when zero pressure is applied(This can be easilyaccomplished by removing the Tygon tubing from the hose barb fitting). Use the “zero” function ifnecessary.Re-connect the tygon tubing and make sure that the value displayed is negative(-) when the cabinet isrunning.Low Flow Alarm SettingPlace a DIM airflow hood on the front of the cabinet or use the 3 inch method for measuring inflow.Adjust cabinet to a 20% reduction in airflow by decreasing the voltage to motor. DO NOT adjust thedamperRecord the exhaust/ damper pressure on Modus (indication of exhaust plenum pressure at20% reduction) and voltage to motor/ blower (across M1, M2 on speed control)Set the Modus High Alarm set point to the 20% reduction in pressure recorded in step 14 (per Modusprogramming instructions below)Set the Modus dead band to .002 (per Modus programming instructions below).Return cabinet to Nominal Set Point voltage, recorded in step 2Check the CalibrationSet Point CheckWhile measuring the intake airflow with a DIM, reduce the airflow by decreasing the voltage tomotor/ blower until a 20% reduction in flow is measured. Check that the low set point alarms at thisvalue. If not, reset Modus low alarm set point to alarm as desired, per instructions. Return cabinetto Set Point Voltage.Page 20 of 54