Onicon F-5100 Insertion Manual do Utilizador descarregar pdf (Página 24)

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F-5100 Insertion Thermal Mass Flow Meter Manual 05/15 - 0663-20 / 18333 Page 24

4.4 START-UP & COMMISSIONING

Please read the entire procedure before proceeding. A worksheet for checking off the following

steps and recording measured values is located on the next page.

1. Conrm ow sensor location.

Conrm adequate straight pipe run

to achieve desired results.

Is the sensor located in the correct location as required by the plans?

Compare the actual straight pipe upstream and downstream of the

sensor location to recommended distances identied in this manual.

If straight pipe run is very short, consult ONICON PRIOR to

installing the sensor to discuss the possibility of using a ow

conditioner.

2. Conrm pipe size. Conrm that the sensor is tagged for the pipe size in which it is

installed. When in doubt, measure the circumference of the pipe.

Pipe O.D. = (circumference / 3.14) – (insulation thickness x 2).

3. Conrm insertion depth and

orientation.

Refer to the information in section 3.3.1 of this manual to ensure

that the sensor is inserted to the correct depth. Also conrm that the

electronics enclosure is parallel with the pipe and properly oriented

with respect to the direction of ow.

4. Conrm control system

programming.

Conrm that the control system input point is properly congured

for the analog range and/or scale factor identied on the calibration

tag & certicate.

5. Conrm connection to correct

ONICON display

Conrm that the ow sensor serial number matches the ONICON

display (when ordered together).

6. Verify wiring before connecting

power.

Prior to connecting the power, verify that the wiring is correct as

shown in this manual and/or on additional wiring diagrams

provided with the ONICON display. If in doubt, contact ONICON for

assistance before proceeding further.

7. Conrm correct supply voltage. Verify that the supply voltage matches the voltage listed on the

sensor tag.

8. Connect power. Wait approximately 45 seconds after power-on before proceeding

further.

The following steps require ow in the pipe. Flow signal readings should be taken while holding the ow rate

constant, if possible. Otherwise, take the various output readings as quickly as possible.

9. Measure and record analog and

pulse outputs.

Current Output:

Scaled Output:

Refer to ow sensor wiring diagram to locate the correct output

terminals. Use the following formula to calculate the ow rate from

the analog signal measurement:

SCFM = (measured current in mA - 4) X Full Scale Flow Rate

Each 24VDC pulse = unit volume identied as “Scale Factor”

(measure and record time interval between pulses)

10. Compare output signals to each

other and to the ow rate displayed

by the control system.

Compare the ow rate calculated in step 9 to the ow rate indicated

by the control system. Conrm that the control system is registering

scaled output pulses as they occur.

Refer to troubleshooting guide when readings are inconsistent.

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