Xylem WTW FCML 412-M12 Series User manual

OPERATING MANUAL
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FCML 412 N(-S)
FCML 412-M12(-x)
pH-INDEPENDENT SENSOR FOR FREE CHLORINE
FCML 412 N FCML 412 N-S FCML 412-M12(-x)

FCML 412 N(-S), FCML 412-M12
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Copyright © 2024, Xylem Analytics Germany GmbH
Printed in Germany.

FCML 412 N(-S), FCML 412-M12 Contents
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Contents
1Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
1.1 Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2 Electrical connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
2.1 Safety information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1.1 Safety information in the operating manual . . . . . 6
2.1.2 Safety signs on the product . . . . . . . . . . . . . . . . . 6
2.1.3 Further documents providing safety information . 6
2.2 Safe operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.2.1 Authorized use . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.2.2 Requirements for safe operation . . . . . . . . . . . . . 7
2.2.3 Unauthorized use . . . . . . . . . . . . . . . . . . . . . . . . 7
3Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
3.1 Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.2 Filling the membrane cap with electrolyte solution . . . . . . 8
3.3 Electrical connection . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.4 Installation in the flow through vessel D-CL . . . . . . . . . . 10
3.5 Installation in the flow through vessel D 19 . . . . . . . . . . 11
4Measurement / Operation . . . . . . . . . . . . . . . . . . . . . . . .14
4.1 Run-in period . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.2 Check of the sensor / analysis . . . . . . . . . . . . . . . . . . . . 14
4.3 Chlorine measurement with the FCML 412 . . . . . . . . . . 14
5Maintenance, cleaning, storage . . . . . . . . . . . . . . . . . . . .15
5.1 Cleaning the measurement electrode / exchanging the
membrane cap and electrolyte . . . . . . . . . . . . . . . . . . . . 15
5.2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.3 Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.4 Maintenance equipment and replacement parts . . . . . . 17
6Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
7Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
7.1 Measuring characteristics . . . . . . . . . . . . . . . . . . . . . . . 19
7.2 Application characteristics . . . . . . . . . . . . . . . . . . . . . . . 19
7.3 General data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
7.4 Electrical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Overview FCML 412 N(-S), FCML 412-M12
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1 Overview
The FCML 412 chlorine sensors are membrane-covered, amperometric sen-
sors for the determination of free chlorine.
1.1 Structure
With its special design (potentiostatic three electrode system), the sensor
measures all the free chlorine present (sum of gaseous dissolved chlorine,
1 Connection
– FCML 412 N:
PG7 gland
– FCML 412 N-S:
Screw/plug-in coupling for
connection cable AK-CL
– FCML 412-M12:
Flange plug for adapter
ADA CL/IDS
2 Shaft
3 Auxiliary electrode
4 Electrode finger
5 O-ring 14 x 1.8
6 Reference electrode
7 Measuring electrode
8 Valve opening (behind hose ring)
9 Membrane cap
10Membrane holder
11Membrane disk
figure 1-1 Structure: Example FCML 412 N
M48
2
1
8
4
9
10
3
11
6
7
5

FCML 412 N(-S), FCML 412-M12 Overview
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hypochloric acid and hypochlorite) and the chlorine that is bonded to isocy-
anuric acid. The sensor has a strongly reduced pH dependence.
The sensor has integrated measuring electronics and delivers a measuring
signal that is already temperature compensated. It does not require a zero
point adjustment. The routine calibration is carried out through comparison
with the photometric DPD method according to DIN 38408.
1.2 Electrical connection
FCML 412 N The FCML 412 N sensor is connected with the measuring transmitter (e.g.
MULTILINE 1000) via a two wire connection.
The wires are used for the power supply of the measuring transmitter and for
the transmission of measurement signals (4 - 20 mA current signal).
FCML 412 N-S The FCML 412 N-S sensor has a four-pin socket for connection to the
measuring transmitter (e.g. CL 7010) via the AK-CL cable (see section
5.4 MAINTENANCE EQUIPMENT AND REPLACEMENT PARTS).
The power supply and transmission of the measured signal (0 to -1500 mV
voltage signal) are carried out separately via two lines each.
FCML 412-M12 The FCML 412-M12 sensor has an M12 flange plug for connection to the
adapter ADA CL/IDS (see section 5.4 MAINTENANCE EQUIPMENT AND
REPLACEMENT PARTS).
The adapter ADA CL/IDS connects the sensor to the MIQ/IDS module of the
IQ Sensor Net.
Power supply and transmission of the measuring signal are carried out via
the adapter ADA CL/IDS.
Except for the different electrical connection, all FCML 412 sen-
sors are identical.

Safety FCML 412 N(-S), FCML 412-M12
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2Safety
2.1 Safety information
2.1.1 Safety information in the operating manual
This operating manual provides important information on the safe operation
of the product. Read this operating manual thoroughly and make yourself
familiar with the product before putting it into operation or working with it. The
operating manual must be kept in the vicinity of the meter so you can always
find the information you need.
Important safety instructions are highlighted in this operating manual. They
are indicated by the warning symbol (triangle) in the left column. The signal
word (e.g. "CAUTION") indicates the level of danger:
NOTE
indicates a situation where goods might be damaged if the actions mentioned
are not taken.
2.1.2 Safety signs on the product
Note all labels, information signs and safety symbols on the product. A
warning symbol (triangle) without text refers to safety information in this oper-
ating manual.
2.1.3 Further documents providing safety information
The following documents provide additional information, which you should
observe for your safety when working with the measuring system:
Operating manuals of other components of the FCML 412 N(-S),
FCML 412-M12 system (power packs, controller, accessories)
Safety datasheets of calibration and maintenance equipment (e.g. clean-
ing solutions).
WARNING
indicates a possibly dangerous situation that can lead to seri-
ous (irreversible) injury or death if the safety instruction is not
followed.
CAUTION
indicates a possibly dangerous situation that can lead to slight
(reversible) injury if the safety instruction is not followed.

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2.2 Safe operation
2.2.1 Authorized use
The authorized use of the FCML 412 N(-S), FCML 412-M12 is the stationary
measurement of chlorine in drinking water, swimming pool water and process
water. Only the operation and running of the product according to the instruc-
tions and technical specifications given in this operating manual is authorized
(see chapter 7 TECHNICAL DATA). Any other use is considered unauthorized.
2.2.2 Requirements for safe operation
Note the following points for safe operation:
The product may only be operated according to the authorized use spec-
ified above.
The product may only be supplied with power by the energy sources men-
tioned in this operating manual.
The product may only be operated under the environmental conditions
mentioned in this operating manual.
The product may not be opened.
2.2.3 Unauthorized use
The product must not be put into operation if:
it is visibly damaged (e.g. after being transported)
it was stored under adverse conditions for a lengthy period of time (storing
conditions, see chapter 7 TECHNICAL DATA).

Commissioning FCML 412 N(-S), FCML 412-M12
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3 Commissioning
3.1 Scope of delivery
Sensor FCML 412 with membrane cap M48
– Sensor FCML 412 N
or
– Sensor FCML 412 N-S
or
– Sensor FCML 412-M12
Dropping bottle with 100 ml electrolyte solution ELY-FCML 412 N
Polishing strip
Operating manual
3.2 Filling the membrane cap with electrolyte solution
NOTE
Risk of damage for the sensor in the case of improper handling.
Do not touch the electrode finger with your fingers.
Do not apply pressure to the membrane disk.
Do not unscrew the membrane holder.
When it is delivered, the membrane cap is not filled with electrolyte and is
loosely screwed onto the shaft. In order to put the sensor into operation, fill
the membrane head as follows:
Filling the mem-
brane cap 1. Unscrew the membrane cap from the electrode shaft. Place the
membrane cap on a clean (non-absorbent) surface.

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2. Cut off the tip of the dropping bottle until the opening in the tip is vis-
ible, then fill the membrane cap completely with electrolyte solution
making sure it is bubble free.
3. Lift off the hose ring of the membrane cap, which closes the valve
opening, from the side so that the valve opening is exposed (see pic-
ture below).
Hold the sensor shaft in an upright position and place it on the filled
membrane cap. Some of the electrolyte solution will leak over the
upper edge of the membrane cap while doing this. Then screw the
electrode shaft into the membrane cap. For this, first turn the elec-
trode shaft anti-clockwise until the thread catches; then slowly screw
in the electrode shaft as far as it will go until no gap can be seen
between the sensor shaft and membrane cap.
1 Valve opening
2 Hose ring
NOTE
Overpressure in the membrane cap can destroy the membrane disk.
Therefore, make sure the valve opening is not inadvertently closed
by your fingers. Excess electrolyte solution must be able to escape
freely at any time. Screw slowly so that no back pressure can devel
-
op.
4. Using a blunt object, slide the hose ring over the valve opening and
insert it evenly in the groove.
5. Rinse off any electrolyte solution adhering on the outside.
1
2

Commissioning FCML 412 N(-S), FCML 412-M12
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3.3 Electrical connection
How to connect the FCML 412 N(-S) sensor to the measuring transmitter or
the MIQ/IDS module is described in the operating manual of the measuring
transmitter.
How to connect the sensor FCML 412-M12(-x) to the MIQ/IDS module is
explained in the operating manual of the module MIQ/IDS.
3.4 Installation in the flow through vessel D-CL
The flow-through vessel D-CL is optimized for the FCML 412 N(-S) chlorine
sensors.
Proceed as follows to install the sensor:
The position in the flow through vessel has a considerable effect
on the approach flow and, hence, the measuring function of the
sensor. Therefore carefully position the sensor as described
below.
1. Insert the black O-ring, then the PVC slide ring in the 1" installation
opening of the flow through vessel.
2. Push the coupling ring onto the sensor.
3. Insert the sensor with the coupling ring in the flow-through vessel.
4. Screw the sensor tight with the coupling ring.