M&C LA Series User manual

Liquid Alarm Sensors for Conductive Media
Series LA®
LA1S, LA25S
Flow Chambers
LS, LS25
With Electronic Controllers
LA1.1, LA1.4
Instruction Manual
Version 1.01.01

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Dear customer,
Thank you for buying our product. In this instruction manual you will find all necessary information
about this M&C product. The information in the instruction manual is fast and easy to find, so you can
start using your M&C product right after you have read the manual.
If you have any question regarding the product or the application, please don’t hesitate to contact
M&C or your M&C authorized distributor. You will find all the addresses in the appendix of this manual.
For additional information about our products and our company, please go to M&C’s website
www.mc-techgroup.com. There you will find the data sheets and manuals of our products in German
and English.
This Operating Manual does not claim completeness and may be
subject to technical modifications.
© 10/2019 M&C TechGroup Germany GmbH. Reproduction of this
document or its content is not allowed without permission from M&C.
LA®is a registered trade mark.
Version: 1.01.01

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Contents
1General information..............................................................................................................4
2Declaration of conformity ....................................................................................................4
3Safety instructions ...............................................................................................................5
4Warranty................................................................................................................................5
5Used terms and signal indications......................................................................................6
6Introduction...........................................................................................................................8
7Application............................................................................................................................8
8Technical Data......................................................................................................................8
9Description............................................................................................................................9
10 Receipt of goods and storage............................................................................................10
11 Installation instructions and Dimensions.........................................................................11
12 Mounting.............................................................................................................................13
12.1 Factory pre-assembly of complete monitoring units.....................................................13
12.2 Mounting the sensor LA1S into the universal filter .......................................................14
12.3 Mounting of the sensor LA1S into the flow chamber LS...............................................14
12.4 Mounting the Sensor LA25S onto the Universal filter...................................................15
12.5 Mounting the Sensor LA25S into the flow chamber LS25............................................16
13 Supply connections............................................................................................................16
13.1 Electrical connections..................................................................................................16
13.1.1 Electronic controller LA1.1 ...................................................................................17
13.1.2 Electronic controller LA1.4 ..................................................................................18
13.2 Pneumatic connections................................................................................................20
14 Commissioning...................................................................................................................21
14.1 Commissioning with a dry sensor ................................................................................21
14.2 Function test................................................................................................................21
14.3 Adjustment of sensitivity ..............................................................................................22
14.4 Adjustment of alarm holding function...........................................................................23
15 Closing down......................................................................................................................23
16 Maintenance and repair......................................................................................................23
17 Spare parts list....................................................................................................................25
18 Appendix.............................................................................................................................25
List of illustrations
Figure 1 Flow chamber LS with liquid sensor LA1S...................................................................... 12
Figure 2 Flow chamber LS 25 with liquid sensor LA25S ............................................................... 12
Figure 3 Liquid sensor LA1S with filter F...-...D and LA25S with Filter FSS-...-D........................... 13
Figure 4 Mounting of the sensor LA1S into flow chamber LS........................................................ 15
Figure 5 Electrical connection and dimensions LA1.1................................................................... 18
Figure 6 Electrical connection and dimensions LA1.4................................................................... 19
Figure 7 LA1.4 assembly diagram ................................................................................................ 20
Figure 8 Flow diagram LA1.1, 115/230 V 50/60 Hz....................................................................... 26
Figure 9 Flow diagram LA1.1, 24V AC/DC.................................................................................... 27
Figure 10 Flow diagram LA1.4, 115/230V 50/60Hz......................................................................... 28
Figure 11 Flow diagram LA1.4, 24V AC/DC.................................................................................... 29

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Head Office
M&C TechGroup Germany GmbH Rehhecke 79 40885 Ratingen Germany
Telephone: 02102 / 935 - 0
Fax: 02102 / 935 - 111
E - mail: [e-mail]
www.mc-techgroup.com
1 GENERAL INFORMATION
The product described in this manual has been built and tested in our production facility.
All M&C products are packed to be shipped safely. To ensure the safe operation and to maintain the
safe condition, all instructions and regulations stated in this manual need to be followed. This manual
includes all information regarding proper transportation, storage, installation, operation and
maintenance of this product by qualified personnel.
Follow all instructions and warnings closely.
Read this manual carefully before commissioning and operating the device. If you have any questions
regarding the product or the application, please don’t hesitate to contact M&C or your M&C authorized
distributor.
2 DECLARATION OF CONFORMITY
CE - Certification
The product described in this operating manual complies with the following EU directives:
EMC-Instruction
The requirements of the EU directive 2014/30/EU “Electromagnetic compatibility“ are met.
Low Voltage Directive
The requirement of the EU directive 2014/35/EU “Low Voltage Directive“ are met.
The compliance with this EU directive has been examined according to DIN EN 61010.
RoHS Directive
The requirements of the RoHS2 (‘Restriction of Hazardous Substances 2’) directive 2011/65/EU and its
annexes are met.
Declaration of conformity
The EU Declaration of conformity can be downloaded from the M&C homepage or directly requested
from M&C.

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3 SAFETY INSTRUCTIONS
Follow these safety directions and instructions regarding installation, commissioning and
operation of this equipment:
Read this manual before commissioning and operating the product. Make sure to follow all safety
instructions.
Installation and commissioning of electrical devices must be carried out only by qualified skilled
personnel in compliance with the current regulations.
The installation and commissioning of the device must conform to the requirements of VDE 0100 (IEC
364) ‘Regulations on the Installation of Power Circuits with Nominal Voltages below 1000 V’ and must
be in compliance with all relevant regulations and standards.
Check the details on the type plate to ensure that the equipment is connected to the correct mains
voltage.
Protection against damages caused by high voltages:
Disconnect the power supply before opening the device for access. Make sure that all extern power
supplies are disconnected.
The device is only to be used within the permitted range of temperatures and pressures.
Operate the device only in the permitted temperature and pressure ranges. For details please refer to
the technical data sheet or manual.
Install the device only in protected areas, sheltered from sun, rain and moisture. The product should not
be exposure to the elements.
The electronic controllers LA1.1 and LA1.4 as well as the liquid sensors LA1S and LA25S in combination
with these electronic controllers are not allowed to be used in hazardous areas.
Installation, maintenance, inspections and any repairs of the devices must be carried out only by
qualified skilled personnel in compliance with the current regulations.
4 WARRANTY
In case of a device failure, please contact immediately M&C or your M&C authorized distributor.
We have a warranty period of 12 months from the delivery date. The warranty covers only
appropriately used products and does not cover the consumable parts. Please find the complete
warranty conditions in our terms and conditions.
The warranty includes a free-of-charge repair in our production facility or the free replacement of the
device. If you return a device to M&C, please be sure that it is properly packaged and shipped with
protective packaging. The repaired or replaced device will be shipped free of delivery charges to the
point of use.

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5 USED TERMS AND SIGNAL INDICATIONS
DANGER!
This means that death, severe physical injuries and/or important
material damages will occur in case the respective safety measures
are not fulfilled.
WARNING !
This means that death, severe physical injuries and/or important
material damages may occur in case the respective safety measures
are not fulfilled.
CAUTION!
This means that minor physical injuries may occur in case the
respective safety measures are not fulfilled.
CAU TION!
Without the warning triangle meansthat a material damage may occur
in case the respective safety measures are not met.
ATTENTION!
This means that an unintentional situation or an unintentional status
may occur in case the respective note is not respected.
NOTE!
These are important information about the product or parts of the
operating manual which require user’s attention.
Qualified personnel
‘Qualified personnel’ are experts who are familiar with the
installation, mounting, commissioning and operation of these types
of products.
High voltages!
Protect yourself and others against damages which might be caused
by high voltages.
Corrosive!
These substances destroy living tissue and equipment upon contact.
Do not breathe vapors; avoid contact with skin and eyes.
Wear protective gloves!
Working with chemicals, sharpe objects or extremly high
temperatures requires wearing protective gloves.

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Wear safety glasses!
Protect your eyes while working with chemicals or sharpe objects.
Wear safety glasses to avoid getting something in your eyes.
Wear protective clothes!
Working with chemicals, sharpe objects or extremly high
temperatures requires wearing protective clothes.

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6 INTRODUCTION
The M&C liquid alarm units series LA®are designed for stationary continuous operation and when
installed properly guarantee a long service life and a minimum of maintenance work.
7 APPLICATION
Liquid alarm sensors LA1S and LA25S are used in gas sample conditioning systems for monitoring gas
cooling and condensate drain-off devices in order to provide protection for downstream analysis
instruments. This straightforward monitoring device reliably signals the condensate ingress in the event
of cooling or condensate drain-off equipment being defective and thus avoids expensive down times as
well as high repair costs for analysis instruments.
The electronic controllers LA1.1 and LA1.4 are used for feeding and signal processing of the liquid
alarm sensors LA1S and LA25S.
In the event of alarm, the power for the sample gas pump or a solenoid valve is to be switched off in the
gas sample conditioning system.
8 TECHNICAL DATA
Sensor Series LA®
LA1S
LA25S
Flow chamber
LS
LS25
Part No.
03E1001
03E3100
03E1111
03E1120
Connection cable
length
(ø 4.2 mm, 2-core)
4 m [13.1 ft]
4 m [13.1 ft]
Each additional meter of connection cable = Part No. 03E9001, total max. 100
meters [328 ft]
Pressure
0 to 4 bar g****
0 to 25 bar g (up to 100 bar g on
request*)
Flow rate
0 to 1000 l/h
Operating
temperature
+80 °C *** [176 °F]
Gas connections
ø 12 mm
G 1/4" i
1/4" NPT a
ø 8 mm **
Stagnant space
Approx. 3 ml
Approx. 3 ml
Material of sample
contacting parts ***
Glass, platinum
PVDF, FPM
SS316Ti, PVDF
SS316Ti
Type of mounting
Clamping
attachment
Wall mount
Screw on
Tube
Mounting position
Vertical
Electrical conductivity
> 50 µS/cm
Weight
50 g
[approx. 0.11 lb]
60 g
[approx. 0.13 lb]
140 g
[approx. 0.31 lb]
100 g
[approx. 0.22 lb]
* other pressure ranges on request
** other dimensions on request
*** other materials or temperatures on request
**** max. 2 bar when mounted in universal filter
A Electronic controllers type LA-1.1 LA-1.4

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Electronic Controller Series
LA®Type
LA1.1
LA1.4
Part No.
230 V 50/60 Hz
115 V 50/60 Hz
24 V DC
24 V AC
03E2001*
03E2001*
03E2001*d
03E2001*b
03E2006
03E2006a
03E2006d
03E2006d
Mounting
Wall mount housing, rail mount housing EN 50022
Sensor inlets
1
Power consumption
2 VA
1 VA
Alarm-relay (2x MC/NC/NO)
contact rating
250 V DC/AC
DC=50 W, AC=500 VA, 3 A
250 V DC/AC
DC=45 W, AC=500 VA, 2 A
Cable inlet
1 x terminal range 3 –6.5 mm
2 x terminal range 5 –10 mm
Electrical connection
Terminals max. 2.5 mm2
Adjustment of switching point
Via potentiometer inside the
housing (open housing first)
Via potentiometer located at the
front of the housing
Distance between sensor and
electronic LA1..
Max. 100 m [328 ft]
Line break control system
Yes
Alarm reset**
Yes
Protection type
IP65 EN 60529
IP20 EN 60529
Housing material
Polycarbonate
Polyamide PA 6.6 combustibility
class VO (UL94)
Ambient temperature
-25 to +60 °C [-13 to 140 °F]
Dimensions (W x H x D)
80 x 55 x 160 mm
[approx. 3.1” x 2.2” x 6.3”]
22.8 x 100 x 111 mm
[approx. 0.9” x 3.9” x 4,4”]
Weight
0.31 kg [approx. 0.7 lb]
0.23 kg [approx. 0.5 lb]
Reversible distribution voltage 230 V 50 Hz/115 V 60 Hz, factory adjusted to 230 V 50 Hz.
** Factory deactivated
9 DESCRIPTION
The M&C liquid sensors LA..S works on the principle of electrical conductivity from 20 µS/cm
conductance. In order to avoid electrolytic effects on the sensor surface, the sensors are powered with
alternating current.
NOTE!
For the M&C liquid sensors LA...S, only the newly developed controller
electronics from model year 04/2006 describedin this instruction manual can
be used.
The M&C LA...S liquid sensors are constructed in such a way that any droplets of liquid in the sample
gas are attracted under gravity to the sensor surface and even the smallest liquid droplets trigger a
reliable and fast alarm.
The LA1S sensor is designed for operating pressures up to 4 bar and LA25S for up to 25 bar. The
sensors housing protection corresponds to type IP65 EN 60529.

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The LA1S sensor with its Ø 12 mm glass body can be mounted inside a GL connection of a F...-...-D
universal filter or in the LS flow chamber. The LA25S sensor has got a 1/4" special male connector for
mounting inside the FSS...-D universal filter or for mounting inside a 8 mm tube using a special union
tee connector LS25.
With the universal filters and the flow chamber, the gas inlet and gas outlet can be rotated 180 degrees
during installation.
The corresponding M&C controller electronics are available in 2 mounting variants for wall mounting
LA1.1 and rail mounting LA1.4.
A line break control system is integrated for safe operation. One LED each is provided for operation and
fault indication, as well as two potential-free changeover contacts in "Safety First" circuit for safe alarm
signalling. The electronic controller LA1... contain an alarm hold function and an alarm reset which can
be activated or deactivated on request. They are not activated on delivery.
By using one of the contacts, a pump or a solenoid valve in the gas conditioning system can be switched
directly and the second contact can be used as a status alarm.
The switching point of the electronic controller LA1... is adjustable via a potentiometer. A standard
adjustment to a conductivity of 100µS/cm is set at the factory.
ATTENTION!
Use the special electronic controller ER142 Exi (without line break control)
(Part No. 03E2009(a)) onlyfor the intrinsically safe supplyof the sensor LA1
or LA25 of the old series located in the EX area.
When used with the new sensors LA1S and LA25S, there is no explosion
protection.
10 RECEIPT OF GOODS AND STORAGE
The liquid alarm series LA®are normally delivered in 2 packing units:
1. Universal filter F...-...-D or flow chamber LS and liquid sensor LA ...S
2. Electronic controller LA1...
Carefully remove the components and any special accessories from the transport packaging
immediately upon arrival and check the scope of delivery according to the delivery note;
Check the goods for possible transport damage and, if necessary, inform your transport insurer
immediately of any possible damage.
NOTE!
The liquid alarm components should be stored in a protected frost-free
area!

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11 INSTALLATION INSTRUCTIONS AND DIMENSIONS
The liquid alarm sensor LA...S is used for detecting liquids and is to be installed behind the gas
dehydration devices, e.g. behind a gas cooler, but always on the deepest point of the installation. This
is provided by the universal filters F…-...-D and the flow chambers LS or LS25.
The filters F...-...D and the flow chambers LS are designed for wall mounting and are mounted by using
2 fastening screws.
The operating position is exclusively vertical, only then an immediate alarm is guaranteed in case of
liquid ingress.
The outdoor installation of the valves can only be carried out without special protective measures, when
the ambient temperature in winter does not fall below the dew point temperature of the sample gas.
The gas inlet and outlet of the filter can be positioned right or left by moving the blue mounting bracket.
There is also a vertical inlet connection with a dummy plug. The flowchamber has the gas inlet vertically
and the gas outlet horizontally right or left, depending on the type of mounting.
NOTE!
During mounting, the gas inlet and gas outlet of the universal filter and
the flow chamber can be rotated 180 degrees.
The flow direction is marked with arrows.
The standard gas connections of the universal filters F...-...-D and the flow chamber LS are G 1/4" i.
Depending on the application, the gas connections can be made with soft tubing, e.g. PVC, Novoprene,
FPM or with rigid plastic or metal tubes, e.g. PTFE or stainless steel.
You will find the corresponding connection fittings in our product range.

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G1/4"
115
LA1
25
12
13
ø50
G1/4"
17 12
ø5
25 LS
Figure 1 Flow chamber LS with liquid sensor LA1S
Sample gas
Sample gas
LA 25S
LS 25
DN 8
DN 8
120
Figure 2 Flow chamber LS 25 with liquid sensor LA25S
LA 1S
LS

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Universal filter
F..-..D / FSS-..-D
Sample gas
Sample gas
LA 25S
LA 1S
290
290
Figure 3 Liquid sensor LA1S with filter F...-...D and LA25S with Filter FSS-...-D
12 MOUNTING
12.1 FACTORY PRE-ASSEMBLY OF COMPLETE MONITORING UNITS
If a complete monitoring unit consisting of a liquid sensor, universal filter or flow chamber and electronic
controller is ordered as a complete unit, the sensor is mounted as far as possible in the corresponding
mounting hardware at the factory.
For transportation, the sensor LA1S of the universal filters F...-...-D is pre-assembled. The LA1S sensor
needs only to be hand-tightened with the GL25 union nut in the lower GL connection of the filter by
turning it to the right.
NOTE!
Please check before assembling that the clamping ring GL25-12 of
PTFE/silicone is not defect and is placed on the sensor, the white PTFE
surface pointing to the viewer (medium side). Only then, the necessary leak-
proofing is guaranteed.
The sensor LA25S needs to be screwed with the pre-assembled 1/4“ NPT fitting into the thread of the
stainless steel filter body by using a Teflon tape.
If sensors are supplied with a flow chamber, they are pre-assembled.

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12.2 MOUNTING THE SENSOR LA1S INTO THE UNIVERSAL FILTER
If individual components are assembled by the customer, the sensor is mounted as follows:
•Remove the GL25 union nut incl. the inner GL25-12 clamping ring from the filter.
•Pull the red cable anti-kink protection of the LA1S sensor backwards, in the direction of the
connecting cable from the sensor body using slight swivel movements.
•Push the GL25 union nut with its internal thread towards the sensor tip (platinum electrodes) on
the sensor body towards the rear in the direction of the red cable anti-kink protection.
•Push the GL25-12 clamping ring with the white PTFE surface towards the sensor tip (medium
side) over the bulge on the sensor body.
NOTE!
The PTFE/Silicone clamping ring GL25-12 must not be defective. Only then,
the necessary tightness is guaranteed.
•Push the red union nut with clamping ring against the bulge on the sensor body.
•Slide the red cable anti-kink protection back onto the sensor body using slight swivel movements.
•Screw the GL25 union nut with sensor onto the GL connection thread of the filter.
12.3 MOUNTING OF THE SENSOR LA1S INTO THE FLOW CHAMBER LS
If individual components are assembled by the customer, the sensor is mounted as follows:
•Remove the union nut including the inner O-ring and the pressure ring from the chamber body.
•Pull the red cable anti-kink protection from the sensor body over the connecting cable using slight
swivel movements.
•Push the union nut with its internal thread towards the sensor tip (platinum electrodes) over the
connection cable onto the sensor body.
•Push the PVDF pressure ring and then the black FPM O-ring on the electrode side up to the
bulge on the sensor body.
NOTE!
The O-ring must not be damaged. Only then the necessary tightness is
ensured.
•Push the union nut on the sensor body up to the bulge.
•Insert the sensor connection cable again through the red cable anti-kink protection and push it
approx. 15 mm [0.59”] onto the sensor body by means of slight swivel movements.
•Mount the sensor with union nut into the lower connection of the flow chamber.

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Union nut
Antikink
Pos.
Part No.
Description
1
0B90E1000
FPM O-ring 14
2
90E1010
PVDF –pressing ring 16
3
03E1001
Liquid sensor LA1S with 4 m connection cable
4
03E3100
Flow chamber LS with union nut
Figure 4 Mounting of the sensor LA1S into flow chamber LS
12.4 MOUNTING THE SENSOR LA25S ONTO THE UNIVERSAL FILTER
If individual components are assembled by the customer, the sensor is mounted as follows:
•Screw the attached mounting fitting with a Teflon tape into the filter body.
•Put the sensor with pre-assembled union nut and the pre-assembled pressing and cutting ring
into the fitting and tighten the union nut hand-tight. Then tighten the union nut with a flat key
exactly 1 ¼ rotations. The nut is then correctly fitted.

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12.5 MOUNTING THE SENSOR LA25S INTO THE FLOW CHAMBER LS25
If individual components are assembled by the customer, the sensor is mounted as follows:
•Insert the sensor with the pre-assembled union nut and the pre-assembled pressure and cutting
ring into the screw fitting and tighten the union nut. First tighten the nut hand-tight, then tighten
the nut exactly 1 1/4 turn with a flat spanner. The nut is then correctly fitted.
13 SUPPLY CONNECTIONS
13.1 ELECTRICAL CONNECTIONS
W ARNING!
Incorrect supply voltage may destroy the equipment. Please take
care of the correct voltage as indicated on the type plate!
The supply voltage may vary from the indication on the type plate
by max. ± 10%.
NOTE!
When setting high-power electrical units with nominal voltages of
up to 1000V, attention must be paid to the requirement of IEC 364
(DIN VDE 0100) as well as the associated standards and
stipulations!
The electronic controller LA1.1 are equipped with a mains selector switch S3 for 230/115 V. At works,
this selector switch is adjusted to 230 V. Check the desired voltage before starting and, if necessary,
change the selector switch by using a screw driver.
The electronic controller LA1.4 in 24 V version are suitable for both, constant voltage and alternating
voltage.
The sensor cable should not be too short at the mounting fitting, so that the sensor can be easily
disassembled during inspection or cleaning.
NOTE!
Only the sensor types LA1S and LA25S provide a line break
control.
NOTE!
The connection cable of the LA1S or LA25S sensor is a standard
2-wire cable and can be extended up to 100 m via standard
terminals if required.
The connection cable of the old sensors LA1, LA25 and LA1-H is a
special HF cable which must not be extended and connected to
standard terminals, otherwise the cable shielding will be
interrupted.

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13.1.1 ELECTRONIC CONTROLLER LA1.1
The following steps must be carried out for electrical connection (see Figure 4):
•Loosen the 4 lid screws and remove the lid.
•Lead the connection cables through the respective clamp fitting.
•The electrical connection of the sensor LA1S or LA25S is made according the colors on the
terminals 5 = brown and 6 = white.
Old sensors of type LA1, LA25 and LA1-H are to be connected to terminals 5 = brown and 8 =
white. In this case, a bridge must be installed between terminals 6 and 7.
NOTE!
If the older sensor LA1, LA25 or LA1-H is connected the same way as the
new sensor LA1S, the function of the electronic is inverted: no liquid = alarm,
liquid = OK.
NOTE!
If a new sensor LA1S is connected the same way as the old sensor LA1, LA25
or LA1-H no line break control is existing.
•The voltage supply is connected to terminals 1 = L, 2 = N and 3 = PE.
•The alarms are connected to terminals 12, 22 = alarm.
•The center contact is connected to terminals 11, 21.
•The relay contact 14, 24 = OK is energized in the good state.

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Figure 5 Electrical connection and dimensions LA1.1
13.1.2 ELECTRONIC CONTROLLER LA1.4
For the electrical connection, the following steps have to be carried out (see also Figure 5):
•The electrical connection of the sensor LA1S or LA25S is to be made on terminals 5 = brown
and 6 = white.
Old sensors of type LA1, LA25 and LA1-H are to be connected to terminals 5 = brown and 8 =
white. In this case, you must install a bridge between terminals 6 and 7.
•The voltage supply is connected to the terminals 1 = L, 2 = N and 4 = PE.
•The alarms are connected to terminals 12, 22 = alarm.

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•The center contact is connected to terminals 11, 21.
•The relay contact 14, 24 = OK is energized in the good state.
Figure 6 Electrical connection and dimensions LA1.4

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Figure 7 LA1.4 assembly diagram
13.2 PNEUMATIC CONNECTIONS
When using the universal filters F...-...-D and the flow chamber LS, two screw connections with thread
G 1/4" a and corresponding hose or tube connection must be used for the connection of sample gas
lines. The fittings must be screwed into the universal filter or the flow chamber with PTFE tape.
The LS25 flow chamber already has screw connections for 8 mm tubes.
For mounting the tube or hose lines:
•Remove the union nuts as well as the pressure and cutting rings from the screw connection.
•Slide the union nut, then the pressure ring, then the cutting ring onto the tube or hose.
•Insert the hose or tube into the fitting and tighten the union nut hand-tight.
•Tighten the stainless steel nuts hand-tight, then tighten them with a flat spanner exactly 1 1/4
turn. The stainless steel nuts are then correctly mounted.