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F-5100 Insertion Thermal Mass Flow Meter Manual 05/15 - 0663-20 / 18333 Page 11

SECTION 3.0: INSTALLATION, REMOVAL AND ADJUSTMENT

WARNING

Insertion ow sensors may be installed in pipes which are under high pressure or pipes lled with

combustible gases. Accidents with these systems can cause serious injury or death. Only persons

experienced with high pressure and/or combustible gas distribution systems and uid sensoring

should attempt to install, adjust, or remove the ow sensor. Please read all instructions carefully

before attempting to install, remove or service a ow sensor.

ONICON will be happy to assist with technical recommendations and to provide guidance by phone

or e-mail. On-site eld engineering, installation and service are also available at an additional cost.

3.1 INSTALLATION SITE SELECTION

Install the ow sensor where it will be accessible for personnel to perform necessary periodic

maintenance. The clearance required for installation is typically 30-36” from the pipe wall

to the nearest obstruction above the valve assembly. This clearance dimension will increase

with larger diameter pipes. Refer to Section 1.6 WORKING ENVIRONMENT for additional

considerations.

ONICON insertion style ow sensors must also be correctly oriented in the pipe with respect

to the direction of ow and the UPSTREAM mark on the stem. On sensors with an integrally

mounted display, this will affect the orientation of the display.

F-5000 Series

ONICON

Flow Direction

The drawings above illustrate the relationship between

flow direction and display orientation for standard meters.

F-5000 Series

ONICON

F-5000 Series

ONICON

The drawings above illustrate the relationship between the integral display, the ow direction

and the orientation of the sensor when installed in the pipe. Contact ONICON for assistance if

this relationship does not allow for viewing the display.

GENERAL PRACTICES:

1. For best results, install the ow sensor in a straight run of pipe, free of bends, tees,

valves, transitions and obstructions.

2. Straight run requirements vary based on the nature of the upstream obstruction.

See the table on page 13 for guidelines in determining upstream straight run

requirements. Depending upon specic location details, more or less straight run

may be required to produce a satisfactory ow prole.

3. If there is insufcient straight run, allow 80% of the run upstream and 20% of

the run downstream. If the total length of straight run is less than 75% of the

recommended distance, performance may seriously degrade, and consideration

should be given to installing a ow conditioner.

F-5000 Series

ONICON

Flow Direction

The drawings above illustrate the relationship between

flow direction and display orientation for standard meters.

UPSTREAM

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 32 33

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