Onicon F-5200 Inline Manual do Utilizador descarregar pdf (Página 16)

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F-5200 Inline Thermal Mass Flow Meter Manual 05/14 - 0763-4 / 19476 Page 16

SECTION 4.0: START-UP & COMMISSIONING FOR ONICON

INLINE THERMAL MASS FLOW METERS

4.1 HELPFUL HINTS FOR START-UP & COMMISSIONING

A step-by-step procedure and companion worksheet are located on the next two pages. Please

read all installation instructions carefully before proceeding with start-up and commissioning.

Please read these helpful hints before proceeding with the start-up and commissioning procedure

on the next page.

1. When measuring analog output signals, remember that current (mA) must be measured

in series, while voltage is measured in parallel. If the 4-20 mA signal is already connected

to a control system, you must break the connection and measure the signal in series.

2. Do not attempt to rotate the electronics enclosure on the stem.

3. Do not connect power to the analog output without rst conrming that it is congured for

loop powered operation. See section 3.3.2.

4.2 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 meter location.

Conrm adequate straight pipe

run to achieve desired results.

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

Compare actual straight pipe upstream and downstream of the meter location to

recommended distances identied in this manual.

2. Conrm orientation. Refer to the information in section 3.1 of this manual to ensure

that the meter is properly oriented with respect to the direction of ow.

3. 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.

4. Conrm connection to

correct ONICON display

Conrm that the ow meter serial number matches the ONICON

display (when ordered together).

5. 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.

6. Conrm correct supply voltage. Verify that the supply voltage matches the voltage listed on the meter tag.

7. 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.

8. Measure and record analog and

pulse outputs.

Current Output:

Scaled Output:

Refer to ow meter wiring diagram to locate the correct output

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

the analog signal measurement:

SCFH = (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 in seconds)

(Pulse interval (in seconds) / 3600) x Pulse weight = Pulse rate

Example: Interval between pulses is 10 seconds and each pulse is equal to 10

SCF. (10/3600) x 10 = 3600 SCFH

9. Compare output signals to

each other and to the ow rate

displayed by the control system.

Compare the ow rate calculated in step 8 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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