Parker Digital MXR-D 4065D User Manual

Contents

Parker Digital MXR-D 4065D User Manual Manual pdf 23 page image

23MONTHLY CALIBRATION CHECKThe MXR Flowmeter is designed to maintain its accuracy and performance without routine usermaintenance being required. The display measurement is auto-zeroed at each STANDBY shut-down. The indicator tubes and ball floats are very resistant to accuracy changes over time such thatthe indicator tubes will maintain their accuracy. Note: Each indicator tube accuracy is ±5% at themarkings.The user can check the relative accuracies of the % concentration and total flow display byperforming a simple check. Servicing is indicated if the readings are out of tolerance.1. With the Nitrous off, turn the Total FlowKnob until the display reads 6 L/min.Adjust the Total Flow knob so the ballfloat in the Oxygen tube is within thelarge circle flow guide. See figure below.2. Turn % N2O knob until the display reads50%.The figure below shows the float withinthe circle flow guide of the Nitrous tubeon the left, and the float within the circleflow guide of the Oxygen tube on theright.3. The ball float in the Nitrous indicator tubeshould be within the large circle flowguide and no more than half of the ballfloat should be out of the large circle flowguide. The figure below shows the ballfloat position to be within tolerance.Note: The figure below shows the ballfloat position to be out of tolerance.BallFloatCircle FlowGuide withBall FloatWithinToleranceBallFloatCircle FlowGuide withBall FloatOutsideToleranceFloat