Micronics Portaflow 222, Руководство пользователя

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Portaflow 222 & 333 User Manual Micronics
Page 28 Issue 3.1 Feb 20
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 Adjusting the calibration factor
IMPORTANT: USE THIS FACILITY WITH CARE & ONLY WHERE NECESSARY
THE PORTAFLOW UNIT IS FULLY CALIBRATED BEFORE LEAVING THE FACTORY AND
UNDER NORMAL CIRCUMSTANCES DOES NOT REQUIRE FURTHER CALIBRATION WHEN
USED ON SITE.
THIS FACILITY CAN BE USED TO CORRECT THE FLOW INDICATION WHERE
UNAVOIDABLE ERRORS OCCUR DUE TO THE LACK OF A STRAIGHT PIPE OR WHERE THE
SENSORS ARE FORCED TO BE FITTED CLOSE TO THE PIPE-END, VALVE, JUNCTION ETC.
ANY ADJUSTMENT MUST BE MADE USING A REFERENCE FLOWMETER FITTED IN THE
SYSTEM.
With the system running:
1.
Stop the Portaflow’s totaliser and zero it (
see page 22).
2. Run the Portaflo
w’s totaliser to measure the total flow over a 30
-60 minute period, and note the
total flow indicated by the reference flow meter over the same period.
3. Calculate the % error between the Portaflow and reference meters. If the error is greater than
±1% calibrate the Portaflow as detailed below.
4.
Press the ENTER key and select ‘Yes’ to confirm that you want to exit the
Read Flow screen.
The Main Menu is displayed.
5. Select View / Edit Site Data .
6. Use the UP/DOWN arrow keys to select Calibration factor . Press the ENTER key.
7. Change the calibration factor according to the error calculated in step 3. For example, if the
Portaflow was reading 1% high then increase the Calibration factor value by 0.010. Conversely,
if the reading is 1% low then decrease the calibration factor to 0.990.
8. Press the ENTER key to apply the change and return to the View/Edit Site Data menu.
9. Scroll down to select Read flow using selected sensor and press the ENTER key.
10. Check the flow measurement against the reference flow meter again.