Page 1
Level detector
LD61
Users Manual
C-MI-LD61 Rev.: 2 English version
Page 2
TECHNICAL DATA
Material: Fork: EN 1.4404 (AISI 316L). Others on demand.
Housing: Polycarbonate.
Pipe fittings: Threads G1 (BSP), 1 NPT.
Models: 24-250 Vac. Maximum load 350 mA. 2 wire connection with series load
12 - 55 Vdc. Maximum load 350 mA. 3 wire connection
Switching time: > 1s
Hysteresis: ± 2 mm with H
Working Limits: Viscosity. Up to 10.000 cSt
Density. > 0,6 kg / l
Process temperature (liquid). -30 a 120ºC
Ambient temperature. -20 a 70ºC
Standard pressure: PN 16
Degree of Protection: IP65
Conforms with the Directives 73/23/CE & 89/336/CE
Conforms with the Pressure Equipment Directive 97/23/CE
This equipment is considered as being a pressure accessory and NOT a safety
!
accessory as defined in the 97/23/CE directive, Article 1, paragraph 2.1.3.
Dimensions:
DIN 11851, Clamp ISO 2852.
O
2
Sanitary Thread ( DIN 11851) Clamp (ISO 2852)
2
Page 3
G1 or 1 NPT Thread LD61 ML
WORKING PRINCIPLE
The LD61 level switch is based on the variation
of the natural resonant frequency of a vibrating
fork, when it comes into contact with a liquid.
This variation is detected by the internal
electronics and is used to determine the state
of the output .
RECEPTION
The LD61 level detectors are supplied ready for installation and operation.
They are supplied packed for their protection during storage and haulage.
To handle the detectors, they should always be held by the head, never by the vibrating
!
fork.
The vibrating fork should not be modified or bent, as this can damage the detector beyond
repair.
3
Page 4
ELECTRICAL CONNECTION
o
o
a
The LD61 can be installed as a detector of minimum or maximum level. The electrical connection
is made by means of a DIN 43650-A connector with a PG-9 cable gland. Multiple conductor cable
with sections about 0,5 mm
To open the connector, remove the centre screw and prise open using a small screwdriver in the
slot shown in the following drawing (looking at the female connector from the contact side).
The working mode (maximum or minimum) is chosen by means of the cable connection, as
shown in the following figure.
a) DC version.
2
should be used.
Slot to open the connector
Máxim
Maximum
Ranura de apertur
Minimum
Mínimo
1
--
2
3
b) AC ve r sion.
+
Tierra
Máxim
1
Carga
Load
2
3
NOTE: The AC version has a power consumption of 6 mA when the load is deactivated.
This should be taken into account when the load is a relay. You must make sure that the
dropout voltage of the relay is greater than the voltage across the coil when a current of 6
mA flows through it. If the dropout voltage is equal or smaller then the relay can be in an
activated position independent of the LD61 state.
4
L
N
Tierra
1
2
3
Minimum Maximum
Mínimo
1
2
3
Carga
Load
+
Tierra
L
N
Tierra
Page 5
!
With the AC version. the connection without a load will damage the instrument !
Carga
Load
(relé, electroválvula, etc...)
(relay, electrovalve, etc...)
The LD61 detector cannot be connected in series. Each detector must have its own load. When
Carga
Load
(relé, electroválvula, etc...)
(relay, electrovalve, etc...)
the LD61 is connected to detect a maximum level, the load is “activated” when the fork is not in
contact with the fluid. In the same way, when the LD61 is connected to detect a minimum level,
the load is “activated” when the fork is in contact with the fluid.
The LD61 has a bi-colour LED that indicates the state of the load “activated” (green colour) or
“open” (red colour).
5
Page 6
MOUNTING
The LD61 detector can be mounted in any
position. The more usual insertion points are
shown in the drawing.
In positions 1 the LD61 acts as a maximum
level detector. In positions 2 the LD61 acts as
a minimum level detector and in position 3 it
acts as an empty pipe detector (for example,
to protect a pump).
If the LD61 is installed in a horizontal position
it is recommended to install it with the tines
vertical to avoid accumulation of substances,
especially in the case of high viscosity
materials.
To indicate the position of the tines the LD61
has a round mark on two of the flats of the nut.
These marks should be in a vertical position
when the detector is installed in a horizontal
position.
Punto de
Positioning mark
posicionamiento
1
1
2
2
3
In the same way, when the detector is installed where there is flow, the position must be taken
into account. The flat part of the tines must be aligned parallel with the flow direction.
If the viscosity is high, the tines must be kept away from other objects (such as the wall of the
tank). In these cases it is preferable to install a longer detector.
6
Page 7
The cable gland should be situated on the lower side of the connector. If it is necessary, the
position of the connector can be changed by 90º or 180º. To do this, open the connector and
rotate. This operation must be done with the power disconnected
OPERATION TEST
The operation of the installation can be checked by placing a magnet in the zone shown in the
following figure. This magnet will change the output to the opposite state. In this way the correct
installation of the instrument can be checked without having to change the level in the tank. At the
same time, the bi-colour LED will indicate the change of state of the output.
Nº 00000
24..250 Vac 350 mA
max
IP65
min
LD-61
Test zone
ACCESSORIES
An accessory that permits changing the length of the LD61 which penetrates in the tank is available. This permits adjustment of the detection level.
7
Page 8
MAINTENANCE
The life of the vibrating fork depends basically on the abrasive characteristics of the product used.
The LD61 detector only needs maintenance when the product, which can adhere to the tines, will
not let the detector change to a non detection state. In these cases the tines must be cleaned.
Cleaning
To clean the tines, brush suitable for removing the incrusted product, must be used . You should
not try to knock off the adhered product from the tines.
During the cleaning process, be careful not to apply force against the tines as this can bend them
and damage the detector beyond repair.
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 accide nt .
This warranty is limited to cover the repair or replacem ent 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 equipm ent to our factory or distributor must be previ ously 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.
TECFLUID, S.A.
Narcís Monturiol, 33
E-08960 Sant Just Desvern
Tel. + 34 93 3724511 - Fax + 34 93 4734449
E-mail: [email protected]
Internet: www.tecfluid.com
The technical data in this pamphlet is subject to modification without notification, if the technical innovations in the product or
manufacturing processes so require.
Loading...