Dynasonics TFXL Clamp-On Ultrasonic Flow Manuel d'utilisateur télécharger pdf (Page 9)

06-TTM-UM-00158 8/2012 9

Wiring methods and practices are to be made in accordance

with the NEC - National Electrical Code® - and/or other local

ordinances that may be in e ect. Consult the local electrical

inspector for information regarding wiring regulations.

When making connections to the  eld wiring terminals

inside the  ow meter, strip back the wire insulation approxi-

mately 0.25 inch (6 mm). Stripping back too little may cause

the terminals to clamp on the insulation and not make good

contact. Stripping back too much insulation may lead to a

situation where the wires could short together between ad-

jacent terminals. Wires should be secured in the  eld wiring

terminals using a screw torque of between 0.5 and 0.6 Nm.

If the DC ground terminal is to be utilized as a protec-

tive conductor terminal, the protective conductor shall be

applied  rst and secured independently of other connec-

tions. The protective conductor shall be connected in

such a way that it is unlikely to be removed by servicing

not involving the protective conductor or there shall be a

warning marking requiring the replacement of the protective

conductor after removal.

Power the TFXL  ow meter with a Class 2 direct current

(DC) power source. The power source should be capable of

supplying between 11 and 28 VDC at a minimum of 250 milli-

amps. With the power from the DC power source disabled or

disconnected, connect the positive supply wire and ground

to the appropriate  eld wiring terminals in the  ow meter.

See Figure 1.5. A wiring diagram decal is located on the inner

cover of the  ow meter enclosure for reference.

IMPORTANT NOTE:

Not following instructions properly may impair

safety of equipment and/or personnel.

IMPORTANT NOTE:

Must be operated by a power supply suitable for

the location.

IMPORTANT NOTE:

Do not connect or disconnect either power

or outputs unless the area is known to be

nonhazardous

IMPORTANT NOTE:

Do not connect the interface cable between a

TFXL  ow meter and a personal computer unless

the area is known to be non-hazardous.

TRANSDUCER CONNECTIONS

FIGURE 1.3  TRANSDUCER CONNECTIONS

To access terminal strips for wiring,  rst loosen the four

screws holding the top of the case to the bottom.

NOTE: The four screws are “captive” screws and cannot be

removed from the top of the case.

If the unit has a display remove the four Phillips head screws

that hold the display to the main circuit board and carefully

move it out of the way. Do not over stress the ribbon cable

located between the display and the microprocessor circuit

boards.

Guide the transducer terminations through the transmitter

conduit hole located in the bottom-left of the enclosure.

Secure the transducer cable with the supplied conduit nut (if

 exible conduit was ordered with the transducer).

NOTE: TFXL models with integral transducers have the trans-

ducers connected at the factory and the transducer connections

section can be skipped.

The terminals within TFXL are of a screw-down barrier

terminal type. Depending on the type of transducers being

used there are two terminal strip arrangements possible.

Remote mount small pipe transducers are connected to the

terminals found on the main circuit board.

Remote mount transducers are connected to a “daughter”

board found on the left hand side of the meter.

Connect the appropriate wires at the corresponding screw

terminals in the transmitter. Observe upstream and down-

stream orientation and wire polarity. See Figure 1.3.

NOTE: High temperature transducer cables come with red and

black wire colors. For the red and black combination, the red

wire is positive (+) and the black wire is negative (-).

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Dynasonics TFXL Clamp-On Ultrasonic Flow Manuel d'utilisateur Page 9

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