Dynasonics TFX Ultra Transit Time Flow Meters Manuel d'utilisateur télécharger pdf (Page 34)

HEAT FLOW FOR ENERGY MODELS ONLY

The energy version allows the integration of two 1000 Ohm,

platinum RTDs with the flow meter, effectively providing an

instrument for measuring energy consumed in liquid heating

and cooling systems. If RTDs were ordered with the energy

version of the flow meter, they have been factory calibrated

and are shipped with the meter.

The energy meter has multiple heat ranges to choose

from. For best resolution use the temperature range that

encompasses the temperature range of the application.

The three-wire surface mount RTDs are attached at the

factory to a simple plug-in connector eliminating the

possibility of mis-wiring. Simply install the RTDs on or in the

pipe as recommended, and then plug the RTDs into the RTD

connector in the flow meter.

Four ranges of surface mount RTDs and two lengths of

wetted insertion probes are offered. Other cable lengths for

surface mount RTDs are available. Contact the manufacturer

for additional offerings.

All RTDs are 1000 Ohm platinum, three-wire devices. The

surface mount versions are available in standard lengths

of 20 feet (6 meters), 50 feet (15 meters) and 100 feet (30

meters) of attached shielded cable.

Installation of Surface Mounted RTD’S

Surface mount RTDs should only be utilized on well insulated

pipe. If the area where the RTD is located is not insulated,

inconsistent temperature readings will result. Insertion

(wetted) RTDs should be used on pipes that are not insulated.

Select areas on the supply and return pipes where the RTDs

will be mounted. Remove or peel back the insulation all the

way around the pipe in the installation area. Clean an area

slightly larger than the RTD down to bare metal on the pipe.

Place a small amount of heat sink compound on the pipe in

the RTD installation location. See Figure 3.12. Press the RTD

firmly into the compound. Fasten the RTD to the pipe with

the included stretch tape.

Route the RTD cables back to the flow meter and secure

the cable so that it will not be pulled on or abraded

inadvertently. Replace the insulation on the pipe, ensuring

that the RTDs are not exposed to air currents.



S U PPL Y L IN E

R TD # 1

R ETU R N L IN E

R TD # 2

B A C K OF

C ON N EC TOR

Figure 33: RTD schematic

MINCO

Clean RTD Mounting

Area to Bare Metal Surface

Heat Sink

Compound

Heat Tape

Figure 34: Surface mount RTD installation

HEAT FLOW FOR ENERGY MODELS ONLY

Page 34 March 2014

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Dynasonics TFX Ultra Transit Time Flow Meters Manuel d'utilisateur Page 34

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