Adjusting The Calibration Factor - Micronics Portaflow 222 User Manual

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longer periods are possible if significant drift in measurements have been noted over a longer

period.

Select Continue..

On the Setting Zfo screen, the Running

Average is updated every second. When the

measurement has completed, a loud ½ second

beep will be heard and the countdown will

stop.

You may now select Set Zero Flow.. if desired. It should be noted that you may select this

setting at any time before the measurement is complete if you are satisfied that the average

reading is sufficiently accurate.

Method 2. - Manual Intervention

To manually adjust the zero flow offset:

Stop the liquid flow.

With the instrument in FLOW READING mode, press the Velocity function key and observe the

reading (m/s). Any reading other than 0.000 indicates an offset error and in practice this will

typically be in the range ±0.005m/s (possibly higher with smaller diameter pipes). If a greater

figure is shown, it is worth calibrating the offset to obtain a more accurate result. Continue as

follows:

Press the ENTER key and select 'Yes' to confirm that you want to exit the flow screen. The

Main Menu is displayed.

Select View / Edit Site Data.

Use the UP/DOWN arrow keys to select Cutoff Velocity. Press the ENTER key.

Edit the value as required and then press the ENTER key.

Scroll down to select Read flow using selected sensor and press the ENTER key.

Check that the the Portaflow is now reading zero correctly.

Restart the fluid flow.

NOTE: IN ORDER TO CANCEL ANY APPLIED OFFSET YOU MUST EITHER READ FLOW VIA

QUICK START OR SWITCH THE PORTAFLOW UNIT OFF & ON. ANY VALUE THAT YOU TRIM-

OUT USING THE OFFSET ADJUSTMENT WILL BE ADDED/SUBTRACTED FROM THE FLOW

READING ACROSS THE WHOLE RANGE.

4.6.3