Dwyer UFC User Manual download pdf (Page 27)

3: Operating Procedures

±0.005m/s (possibly higher on smaller diameter pipes). If a greater figure is shown, it is worth cancelling the

offset to obtain a more accurate result. Continue as follows:

3. Press the Options key to access the FLOW

READING OPTION screen shown.

4. Select Set zero flow (m/s) and press

ENTER.

5. Press ENTER on the subsequent screen to

accept the change, which will return you to the

screen shown.

6. Scroll down to select Exit and press ENTER to

return to the FLOW READING screen.

3.3.3 Adjusting the calibration factor

With the system running:

1. Stop (Stall) the totalizer facility and zero it (Paragraph 3.5).

2. Run the totalizer 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 UFC instrument and reference meters. If the error is greater than ±1%

calibrate the UFC as detailed below.

Key Point: In order to cancel any applied offset, you must read the flow via Quick

Start. Any value that you trim-out using the offset adjustment will be added/

subtracted from the flow reading across the whole range.

Key Point: USE THIS FACILITY WITH CARE & ONLY WHERE NECESSARY

The instrument is fully calibrated before leaving the factory and under normal cir-

cumstances 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.

FLOW READING OPTION DD-MM-YY HH:MM:SS

Data review

Zero Cutoff (m/s) : 0.010

Set zero flow (m/s) : 0.000

Damping (secs) : 10

Totalizer : Run

Reset +Total

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Dwyer UFC User Manual Page 27