Th6 Transmitters; Introduction; Models; Th6 - Tecfluid M21 Series Instruction Manual

TH6 TRANSMITTERS

11

INTRODUCTION

Transmitters TH6 are electronic position transducers with a microprocessor. The instrument
uses the Hall effect to capture the field of a magnet. This signal, after the microcontroller
processing, is converted into a current signal of 4-20 mA in a 2-wire loop. This signal is
proportional to the flow rate.
12

MODELS

12.1

TH6

It is a 4 to 20 mA transmitter proportional to flow rate. 4 mA corresponds to beginning of the
scale. 20 mA corresponds to full scale. Between the beginning of the scale and the first point
of the scale the analog output is constant at 4 mA, to avoid false readings of flow rate.
12.2

TH6H

It is a TH6 transmitter that incorporates HART
user can change the measuring range of the 4-20 mA loop, and data like flow rate, with its
associated measuring units.
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ELECTRICAL CONNECTION

For the electrical connection, the transmitter has two screw terminals.
For the electrical installation it is recommended to use multiple conductor cables with
individual cable sections in the order of 0.25 to 0.5 mm
connect.
A twisted pair wiring should be used to avoid electrical interferences in the 4-20 mA loop. In
some instances, shielded cable may be necessary.
Before starting the installation, check that the cable glands are the right size for the cables to
be used, this will guarantee the instrument will stay watertight. The M12x1.5 cable glands
used are for cables with outside diameters between 2.5 mm and 6.5 mm.
Peel the outside insulation to free the inner cables. It is recommended to tin the ends of the
wires to avoid loose ends. Pass the cables through the cable glands and screw down in the
corresponding positions of the terminal strip. Once the wiring is finished make sure that the
cables are well gripped by the cable glands to maintain the degree of protection.
The cable glands must be always closed. Entry of dust or some types of vapours can
damage the internal system of bearings and therefore the equipment.
To help in the wiring of the equipment, the description of the terminals is marked on the
printed circuit next to the terminal strip.
Before connecting the power supply, you must be sure that the supply voltage is the correct
for the installation. The power supply voltage is indicated on the label of the transmitter.
TM protocol compatibility. With this protocol the
2 in order to make it easier to
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