Metra Flow Meter – Instructions (4) Flowmeter Setup – Calibration Settings & Display Appearance of the Metraflow Meter Calibration Settings of the Metraflow Meter Units: A drop down menu offers the choice of – Litres, cc, gms, kg, US gallon, Imperial gallon or Custom units i.e. blank. Rate (units per): This is the time base for the flow rate and has the option of Second, Minute or Hour. Scale Factor Adjustment: This is a fine tune adjustment on the signal to compensate for errors introduced by erratic flow or other system irregularities DENSITY: The flowmeter is fundamentally a volumetric device but a density figure can be entered here if one of the mass units are selected. Caution must be used however as there is no temperature/density correction. Cut Off: Flow values below this level will be set to zero. Display Appearance of the Metraflow Meter Decrease Total for -ve flow: The meter will not register negative flow unless this box is checked.For reverse flow the rate will show a “-“ sign before the rate and the total will be reduced accordingly. One of the transistor outputs (PNP or NPN on Pin 6,7 or Pin 8) could be configured to give a logic level when reverse flow is detected. Display Mode: The down arrow selects from the various display and Metraflow functions.The options are:-Rate – The display will show flow rate only.Total – The display will show total flow only.Both – The display can be cycled from rate to total using the left hand button on the Atrato or the left button in the “Real time window”. A remote input can be used if either pin 6 or pin 7 has been utilised. Rate DP Position: Use the drop down menu to choose the required decimal point position.Total DP Position: Use the drop down menu to choose the required decimal point position.If the decimal point is set too low and the display value exceeds the setting capacity the display will show —-oF—-. Viewing Filter: This prevents the display, flow switches and analogue outputs from jittering with irregularities in the flow from say a peristaltic pump. The increments are arbitrary with the degree of damping approximately doubling with each level. Increments go up to 5, which may take up to a minute to stabilise.