Celec LTR7000 User manual

User’s & Technical Manual – LEVEL TRANSMITTER LTR7000
GELEC Industrial Electronics PAGE 1
LEVEL TRANSMITTER
LTR7000
INDUSTRIAL ELECTRONICS

User’s & Technical Manual – LEVEL TRANSMITTER LTR7000
GELEC Industrial Electronics PAGE 2
CONTENTS
1. PRECAUTIONS!................................................................................................................................................3
2. MANUFACTURER WARRANTY, GENERAL TERMS AND CONDITIONS...................................................4
3. DISPOSAL OF OLD ELECTRICAL & ELECTRONIC EQUIPMENT .................................................................5
4. LEVEL TRANSMITTER LTR7000.....................................................................................................................5
5. GENERAL DESCRIPTION ................................................................................................................................6
6. FEATURES.........................................................................................................................................................8
7. LTR7000 OVERVIEW & CONFIGURATION ................................................................................................11
8. INSTALLATION..............................................................................................................................................14
9. ELECTRICAL SECTION...................................................................................................................................17
10. CALIBRATION PROCESS - DEFAULT SETTINGS........................................................................................22
11. DIMENSIONS.................................................................................................................................................27
12. TECHNICAL SPECIFICATIONS .....................................................................................................................28

User’s & Technical Manual – LEVEL TRANSMITTER LTR7000
GELEC Industrial Electronics PAGE 3
1. PRECAUTIONS!
There are no serviceable parts inside the LTR7000 unit. Not to be opened by any
unauthorized person. Any repair, modification, or configuration of the device must be
carried out by the manufacturer, or a qualified service engineer familiar with the application.
Improper handling may result in serious personal injury and considerable material
damage. All connection and maintenance work must be carried out by qualified personnel.
RISK OF ELECTRIC SHOCK!
Use the correct voltage. The LTR7000 is designed for use
with specific voltage only. Connection to a different voltage
may cause fire, electric shock or other damage.
Do not touch electronic parts and connection cabling with wet hands.
Disconnect power supply from the LTR7000 before maintenance or configuration, to
avoid the risk of electric shock.
Attempting to use a malfunctioning LTR7000 can be dangerous.
Install the LTR7000 in an appropriate area.
LTR7000 consists of a waterproof stainless-steel tube and an IP66 polycarbonate enclosure
with cable gland, which makes it appropriate for harsh industrial environment. Though if
possible, it is recommended to keep the installation area protected from unnecessary
harmful conditions like extremely high/low temperature, steam etc.
If there is suspicion of small object or liquids into LTR7000, unplug the unit immediately.
Have the unit checked by a qualified service engineer before using it again. Any object or
liquid inside the enclosure may result to fire, electric shock, or equipment damage.
Always follow the instructions given by the manufacturer and use the LTR7000
in accordance to its specifications.

User’s & Technical Manual – LEVEL TRANSMITTER LTR7000
GELEC Industrial Electronics PAGE 4
2. MANUFACTURER WARRANTY, GENERAL TERMS AND CONDITIONS
Thank you for purchasing our product.
Our products have been manufactured with the latest technology, the highest quality
components and have gone through rigorous quality control tests at the factory, before
shipment. Make sure that the part number/type indicated on the identification label and
package corresponds to the part number/type of your order. After receiving the unit,
inspect it in order to ensure that no damage was caused during transportation.
GELEC and GELEC’s authorized distributors warrant to the original purchaser that the
product shall be free from defect in material and/or workmanship. The warranty period
begins on the purchase date (proof of purchase by invoice or delivery note) and is valid for
one (1) year.
In the event of malfunction during the warranty period, attributable directly to faulty
material and/or faulty construction and functional defects, GELEC and authorized
distributors will, at their option, either repair or replace the faulty product with the same or
similar model.
GELEC and authorized distributors shall have no obligation under this warranty, however, in
the following cases:
Any defect caused by freight damage, accident, disaster, faulty maintenance or
improper handling.
Any defect caused by modification, alteration, abuse, misuse, or incorrect installation.
Any defect of the product caused by improper repair by third party other than GELEC
and GELEC's authorized distributors.
Any incompatibility of the product with subsequent technical innovations or
regulations.
Any defect of the product caused by external equipment.
Any defect of the product on which the original manufacturer’s labeling has been
altered or removed.
In case of complaint please contact our company, or send the unit un-dismantled to your
local dealer. Any necessary replacement parts and necessary repair work are covered free of
charge.
All products are designed and produced by the manufacturer GELEC Co. LP to be in
compliance with the EU norms applying to them. GELEC is not responsible for direct or
indirect damages or malfunction caused by improper use or installation of the LTR7000.

User’s & Technical Manual – LEVEL TRANSMITTER LTR7000
GELEC Industrial Electronics PAGE 5
3. DISPOSAL OF OLD ELECTRICAL & ELECTRONIC EQUIPMENT
This symbol, found on your product, indicates that this should not be
treated as household waste when you wish to dispose it.
It should be handed over to an applicable collection point for the
recycling of electrical and electronic equipment.
By ensuring this product is disposed of correctly, you will prevent
potential negative consequences to the environment and human
health, which could otherwise be caused by inappropriate disposal of this product.
The recycling of materials will help to preserve natural resources.
4. LEVEL TRANSMITTER LTR7000
This operator's manual explains the functions and operation of the LTR7000. It also gives
some troubleshooting tips as well as general precautions to be taken when operating the
unit. In order to ensure the best performance and effective use of the LTR7000, we
recommend that you read the information in this manual carefully and follow the
instructions contained.
This manual is a complete guide for the LTR7000 with information on unit user
maintenance, unit installation and operational instructions. Do not touch parts of the
LTR7000 that are not referred in this manual. Keep this manual for immediate reference. It
should help in solving any operational questions you may have.
No part of this manual may be quoted, reproduced, stored in a retrieval system,
transmitted, transcribed or translated into any other language in any form or by any means,
electronic, mechanical, or otherwise, without prior written permission of “Gelec Co. LP”.
Although every effort has been made to ensure that this manual provides up to date
information, please note that the contents of this manual and unit specifications are subject
to change without notice.
Don’t forget to mention the exact type and version of
your LTR7000 whenever you contact the manufacturer
asking for any further information. You can find this
information on the identification label of the unit.

User’s & Technical Manual – LEVEL TRANSMITTER LTR7000
GELEC Industrial Electronics PAGE 6
5. GENERAL DESCRIPTION
The LTR7000 is an industrial, rangeable resistive chain level transmitter, suitable for non-
invasive level measurement in open or closed tanks. Its operation is based on the magnetic
floating principle and communicating vessels.
A magnetic float inside a measuring chamber mounted to the application tank, follows the
fluid level changes during process. Having an array of closely spaced hall effect sensors, the
LTR7000 senses the float’s position and therefore the height of the fluid level. It provides a
continuous, linear current and voltage output signal (4-20, 0-20, 4-21mA / 0-5, 0-10V),
proportional to the level height and available for further processing.
The two output signals can be utilized simultaneously or independently and their respective
output range is selected through a dip-switch. LTR7000 zero and span settings can be easily
rescaled in order to meet each application’s operating requirements, while factory default
settings can be restored at any time.
It consists of a stainless-steel square tube which incorporates the sensor chain and a
fiberglass reinforced polycarbonate enclosure, including the microprocessor based
transmitter and the connection terminal block.
With 7mm sensing resolution and a variety of standard analog signals that can be assigned
by the user to any level range up to 205cm, the LTR7000 is an ideal solution for industrial,
heavy-duty level measurement applications.

User’s & Technical Manual – LEVEL TRANSMITTER LTR7000
GELEC Industrial Electronics PAGE 7
MAIN FEATURES
High measuring accuracy (7mm resolution) in industrial environment
Five length versions available (65/100/135/170/205 cm)
Two analog outputs (mA/V)
Five signal standards available (4-20, 0-20, 4-21mA / 0-5, 0-10V)
12mT (120 Gauss) sensor sensitivity - North pole activated
Separate calibration of High and Low critical levels
Error state recognition with relevant output signal
Status LED, calibration button, configuration dip-switch
Factory calibrated to full measuring range
Factory default settings can be restored
Stainless steel square tube 12x12mm
IP66 robust and durable structure
15-36 VDC / 2.5W max
Protective circuit against reverse polarity
ADVANTAGES
Reliable and cost effective operating philosophy
Unaffected from media variables (foam, viscosity, dielectrics, pressure, pH etc.)
Proper for special conditions (surface agitation, boiling, high empty/fill rates etc.)
Suitable for process/storage vessels with non-magnetic measuring chamber
Ideal for high-temperature and high-pressure applications

User’s & Technical Manual – LEVEL TRANSMITTER LTR7000
GELEC Industrial Electronics PAGE 8
6. FEATURES
LTR7000 VERSIONS
LTR7000 is provided in five length versions, depending on the maximum level height that
the device can measure. The resolution is the same in all versions, while the different length
options cover a wide range of installation configurations.
LTR7065
LTR7100
LTR7135
LTR7170
LTR7205
Measured level height
0-65 cm
0-100 cm
0-135 cm
0-170 cm
0-205 cm
Total device height
79 cm
114 cm
149 cm
184 cm
219 cm
Sensor resolution
7 mm
TWO ANALOG OUTPUTS / FIVE OUTPUT RANGES AVAILABLE
LTR7000 provides two analog outputs (mA & V) which can be used either simultaneously,
or independently. There are five common output signal standards available, covering the
majority of process control applications.
The selection of the desired output range can be made from the internal configuration dip
switch (SW1/SW2/SW3). The available output ranges are the following.
mA output ranges :
4 - 20 mA , 0 - 20 mA , 4 - 21 mA
V output ranges :
0 - 10 V , 0 - 5 V
Each output range change, forces the device to properly reconfigure its output linearization.
Notice that the output signal cannot get values outside the selected range, even if the
application fluid (and therefore the floating magnet) exceeds the calibrated operating
region.

User’s & Technical Manual – LEVEL TRANSMITTER LTR7000
GELEC Industrial Electronics PAGE 9
SIMPLE CALIBRATION PROCEDURE / DEFAULT SETTINGS
LTR7000 standard versions are factory calibrated in order to exploit the whole length of
their active measuring segment. So, the minimum output signal of the selected output
range is provided when the float’s magnet is aligned with the lowest point of their sensor
chain (bottom engraved line on the tube), while the maximum output signal is provided
when the float’s magnet is aligned with the highest point of their sensor chain (top
engraved line on the tube).
The factory calibrated level ranges are the following.
LTR7065 :
0-65cm
LTR7100 :
0-100cm
LTR7135 :
0-135cm
LTR7170 :
0-170cm
LTR7205 :
0-205cm
By following a simple calibration procedure, LTR7000 can be calibrated to provide its output
ranges in different level limits than the factory pre-calibrated ones. There is also the option
to restore the default factory calibration settings at any time, if needed. Refer to the
relevant section for more information.
TWO ERROR STATES - ERROR OUTPUT
LTR7000 is designed to detect and manage two Error states that are likely to occur.
As long as the device is in Error state, the STATUS LED indicates the problem and a
signal almost equal to power supply voltage (VPS-1V) is provided through the ERROR
OUTPUT for further utilization.
If the ERROR OUTPUT cannot be used due to application restrictions, there is the option to
get an error signal from the mA output as well. The device can provide an ‘out of range’
24mA signal, which can be recognized as an error signal from the connected PLC. The
output signal value (min or max) during an Error state can be selected from the internal
configuration dip-switch (SW4), depending on the application needs. Refer to the relevant
section for more information.

User’s & Technical Manual – LEVEL TRANSMITTER LTR7000
GELEC Industrial Electronics PAGE 10
ERROR 1 - STATUS LED FLASHING RED (3Hz)
Check the device for the following possible problems.
mA OUTPUT OPEN CIRCUIT
A simple way to confirm an open circuit, is to cut power supply, disconnect the external
circuit from the mA output and short-circuit terminals #3 and #4 with a cable. Turn on the
power for a few seconds, the problem should be solved and the LTR7000 should not be in
Error state. Check the external circuit for disconnections.
Notice that if you are using only the V output, a 390Ωresistor must be connected at the mA
output (terminals #3 and #4). Consult the relevant connection diagram and confirm that
this resistor is properly connected.
HIGH LOAD RESISTANCE RL
The load resistance value connected to mA output (including line resistance), may be higher
than it should be. Refer to the relevant table and confirm that the externally connected
circuit has the proper resistance value.
INTERNAL OVERHEATING
Internal overheating is unlikely to occur and may be caused due to wrong electrical
connections, excessive temperature in the installation area, or LTR7000 hardware damage.
Confirm that all connections and installation environment meet the device specifications.
ERROR 2 - STATUS LED FLASHING RED (1Hz)
THE FLOAT IS MAGNETICALLY UNCOUPLED FROM THE ACTIVE MEASURING SEGMENT, OR
INTERNAL HARDWARE FAILURE.
The float must have an adequate magnetic field and move within the sensor chain range
(vertical and horizontal axis) at all process stages. Ensure that the LTR7000 has not been
moved from its proper installation position. Inspect the measuring chamber and the
magnetic float for defects, or replace the magnetic float and try again. If the measuring
chamber is significantly wider than the float, the float can be out of sensor range within the
chamber.
Check electrical connections and disconnect/reconnect power. If this error remains, the
device has a non-repairable damage. Hardware failure is the most possible cause. Before
replacing the damaged device with a new one, ensure that any possible problem that could
have caused the hardware failure (e.g. wrong connections) is solved.