Tecfluid TR420 User Manual

Converter

instrumentation

for fluids

TR420

Instructions Manual

R-MI-TR420 Rev.: 1 English Version

TABLE OF CONTENTS

1 INTRODUCTION ..................................................................................... 2

2 INSTALLATION ...................................................................................... 2

2.1 Power supply connection ......................................................... 2

2.2 Sensor connection .................................................................... 3

2.3 Output connection ...................................................................... 3

3 TEST AND ADJUSTMENTS ................................................................... 3

3.1 Testing ........................................................................................ 3

3.2 Adjustment ................................................................................. 4

4 SELECTION OF OUTPUT MODES ........................................................ 4

5 TECHNICAL CHARACTERISTICS ...……..........................……............. 5

5.1 Power supply ............................................................................. 5

5.2 Analog output ............................................................................ 5

5.3 Level probe input ....................................................................... 5

5.4 General characteristics ............................................................. 5

6 DIMENSIONS ……………………............................................................. 6

2

1 INTRODUCTION

The TR420 converters provide a voltage or current output proportional to the variation of
the resistance at the input.

It can be adapted to LE and LTE series of level meters, and to PT, PS and 6000 series of
flowmeters.

NOTE: Throughout the manual, indicating the word “level” means “height of the float”, and
therefore can be applied to both level meters and flow meters.

When the float position changes, the associate sensor changes its resistance, and its
value is converted to an output signal.

In all the output modes the converter is active, that is, it supplies the power, therefore the
receivers should be passive.

2 INSTALLATION

The TR420 is housed in an IP40 plastic case for mounting on a panel inside an electric
control panel. The DIP switch in the front of the converter is exclusively for testing and it
must be handled only by maintenance personnel. The plastic case has two holes for
mounting with screws to DIN 46 121 and DIN 43 660, and also it has a snap fastener for
fitting to DIN 46 277 and DIN EN 50 022 assembly rails.

Screw terminals are provided for external wiring. The terminals are protected against
accidental contact in accordance with VDE 0100 Part 750, VDE 0160 Part 100 and VBG 4.

2.1 Power supply connection

Connect the power supply voltage indicated on the label to the terminals 1 & 2.
IMPORTANT NOTE: In order to comply with the electrical safety requirements as per IEC

1010-1, the installation of the equipment must provide
equipment. This switch must be marked as the disconnecting device for the equipment and
be within easy reach of the operator.

The power supply to the converter can be either 24, 110 or 220 VAC or 24 VDC. In the
event that the converter is powered at 24 V and the polarity is not indicated on the
connection label, the equipment can be connected to both 24 VAC or 24 VDC without
taking into account the polarity.

2.2 Sensor connection

The connection between the sensor and the converter TR420 needs only two wires as
indicated in the following figure.

a mains switch to disconnect the

3

2.3 Output connection

In case of current output (4-20 mA), it is recommended that the impedance of the receiver
does not exceed 350 Ω.

3 TEST AND ADJUSTMENTS

3.1 Testing

Remove the transparent cover, and access to the eight contact DIP switch. Move the
switches 1 & 2 to the "OFF" position and switches 3 & 4 to the "ON" position (TEST
configuration). The LED lamp lights up, indicating TEST mode. Use the four switches 5, 6, 7
& 8 to select the different output levels. With all four switches in the "OFF" position we have
an output equivalent to 0% of level and with all four switches in the "ON" position we have an
output for a 100% of level.

No. in ON Level Output

In order to visualise the output current, use the level indicator provided in the plant or
alternatively use a multimeter on the scale of mA.

When the test procedure is over, move the switches 1, 2, 3 & 4 to the normal service
position and the LED lamp will turn off.

3.2 Adjustment

The converters include two potentiometers for adjusting the output range with the individual
probes installed. The potentiometer P01 (marked ZERO on the face plate) is used to adjust
the 0 point, and the potentiometer P02 (marked SPAN) is used to adjust the full scale output
(100% of the level). Adjustment must be made with the switches in "SERVICE" position.

In order to reach the adjustment potentiometers, one must use a fairly long fine screwdriver
since the screw heads of the potentiometers are situated at about 25 mm below the face
plate.

In order to adjust the output the float must be placed at the minimum level position. Then
adjust P01 for a 4 mA output (or minimum output in the event of using other output modes).

Place the float at the maximum level position and adjust P02 to obtain 20 mA or the
maximum output.

4. SELECTION OF OUTPUT MODES

The level converter is designed to have 6 possible output modes that can be adapted to
different signal receivers. All output modes are active outputs, which means that the
converter supplies the current or voltage to the receiver.

The six output modes are the following:

NONE 0 % 4 mA
5 25 % 8 mA
5 & 6 50 % 12 mA
5, 6 & 7 75 % 16 mA
5, 6, 7 & 8 100 % 20 mA

1. 4 - 20 mA output

2. 0 - 20 mA output

3. 1 - 5 V output

4. 0 - 5 V output

5. 2 - 10 V output

6. 0 - 10 V output

4

The different output modes are selected by means of jumpers on headers inside the
converter.

Before opening the converter the power supply must be disconnected.

In order to open the converter to change the output mode, first remove the transparent top
cover, then press outwards the sides of the plastic case to free the clips in the sides of the
terminal blocks and slide the terminal blocks out together with the printed circuits. It is not
necessary to slide the printed circuits completely out of the case, as the jumpers are just
below the terminal block.

The position of the jumpers is as follows:

JP1 JP2 JP3

4 - 20 mA X

0 - 20 mA

1 - 5 V X X X

0 - 5 V X X

2 - 10 V X X

0 - 10 V X

There is a fourth jumper lower down on the printed circuit. It must not be removed as it is only
used for factory adjustments.

5

5. TECHNICAL CHARACTERISTICS

5.1 Power supply

Standard: 220 VAC 50/60 Hz

Other: 240, 110, 24 VAC 50/60 Hz. 24 VDC

Power consumption: Less than 1 VA.

5.2 Analog output

The analog outputs are active. This means that the TR420 supplies the electric current to the
output. The loads that can be applied to the output are the following:

0-20 mA and 4-20 mA. Maximum resistive load: 350 Ω

0-5 V and 1-5 V. Minimum resistive load: 100 kΩ

0-10 V and 2-10 V. Minimum resistive load: 200 kΩ

5.3 Level probe input

The TR420 is designed to work with a probe with 1000 ohms per meter of length. In order to
adapt the probe to the LE-70 a fixed resistor of 10,000 ohm per meter of probe length is
used, this means that the adapting resistor will have ten times the maximum resistance of the
probe. The adapting resistor must be a metal film type with a thermal coefficient of 50 ppm.

5.4 General characteristics

Ingress protection: IP40

Ambient temperature range: From 0 to 60ºC

Conforms with LV Directive 73/23/EEC

Conforms with EMC Directive EMC 89/336/EEC
Conforms with WEEE Directive 2002/96/EC

6

6 DIMENSIONS

7

WARRANTY

Tecfluid S.A. GUARANTEES ALL ITS PRODUCTS FOR A PERIOD OF 24 MONTHS, after
consignment, against all defects in materials and workmanship.

This warranty does not cover failures which can be imputed to misuse, use in an application different
to that specified in the order, the result of service or modification by un-authorized persons, bad
handling or accident.

This warranty is limited to cover the repair or replacement defective parts which have not been
damaged by misuse.

This warranty is limited to the repair of the equipment and all further and eventually following
damages are not covered by this warranty.

Any consignment of equipment to our factory or distributor must be previously authorised. The
consignment should be done with the equipment well packed, clean of any liquids, grease or
hazardous materials. Tecfluid S.A. will not accept any responsibility for damage done during
transport.
Together with the equipment, a note should be enclosed indicating the failure observed, the name,
address and telephone number of the sender.

SHIPMENT
In case of damages during shipping, please claim directly to the forwarder over a period of less
than 24 hours. Tecfluid is not responsible for any damage caused during the shipment of material.

TECFLUID, S.A.
Narcís Monturiol, 33
E-08960 Sant Just Desvern
Tel. + 34 93 3724511 - Fax + 34 93 4734449
E-mail: [e-mail]
Internet: www.tecfluid.com

The technical data in this document is subject to modification without notification, if the technical innovations in the product or
manufacturing processes so require.