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Instruction Manual for the sensors
TARAtec series “7”
October 2015
E N G L I S H
Please carefully read this operating instructions completely before commissioning the probe!
Do not discard!
The operator shall be liable for any damage caused by installation or operating errors!
For types:
Chlorine dioxide
Peracetic acid
CD7 (analog-out/analog)
Ozone
PES7 (analog-out/analog)
OZ7 (analog-out/analog)
Hydrogen peroxide
WP7 (analog-out/analog)
Chlorine dioxide
Peracetic acid
Ozone
Hydrogen peroxide
CD7 4-20mA (analogout/analog)
PES7 4-20mA (analogout/analog)
OZ7 4-20mA (analogout/analog)
WP7 4-20mA (analogout/analog) analog signal output
Dual power supply ±5 - ±15 VDC
Single power supply 10
– 30 VDC analog signal processing no galvanical isolation analog signal output
Current supply 4…20 mA analog signal processing no galvanical isolation
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page 1 of 27
Instruction Manual for the sensors
TARAtec series “7”
Content
Page
Sensor with voltage supply (analog-out/analog)
– 4-20mA with 5-pole M12 .......................... 4
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page 2 of 27
Instruction Manual for the sensors
TARAtec series “7”
1 General information
These sensors can be applied in nearly all water qualities. These sensors are partially resistant to chemicals and surfactants as they are equipped with a special membrane system.
This sensor is not suitable to check the absence of chlorine dioxide /peracetic acid /ozone / hydrogen peroxide.
A complete measuring and/or control system normally consists of the following components:
sensor
electrical leads and connectors
flow chambers and connections
measuring and control device
dosing equipment
analysing instrumentation
This operating instructions primarily refers to the sensor. Please pay attention to the corresponding operating instructions of the peripheral devices!
Warning: Do not touch the electrode finger and keep it clean!
Do not remove the layer on the electrode finger!
1.1 Chlorine dioxide sensor CD7
The chlorine dioxide sensor is insensitive to chlorine. Ozone is measured with a sensitivity 25 times higher than chlorine dioxide. The sensor can be used in the pH range from >pH 1 in alkaline fluids up to the chlorine dioxide stability limit is reached. Precipitations (e. g. lime) may block the membrane!
1.2 Peracetic acid sensor PES7
The sensor can be used in the pH range from >pH 1 up to pH 6. At a pH >6 the peracetic anion is present which cannot be measured by the sensor.
(Lime may block the membrane!)
1.3 Ozone sensor OZ7
The ozone probe is insensitive to chlorine. Chlorine dioxide increases the measuring value about 6%.
The probe can be used within the pH range of pH 2 to pH 12 (lime may block the membrane!).
1.4 Hydrogen peroxide sensor WP7
The probe can be used in the pH range from >pH 2 up to pH 11 (lime may block the membrane)!
2 Function
The sensor is a membrane covered amperometric 2-electrode system. The measuring electrode is membrane covered and is in the electrolyte area together with the reference electrode. This electrolyte area contains a special electrolyte and is separated from the measuring water.
In this measuring method the disinfectant, e. g. chlorine dioxide diffuses out of the measuring water, through the membrane and causes in compound with the electrolyte an electrical signal at the measuring electrode. The electrical signal at the measuring electrode is proportional to the concentration of the disinfectant and is amplified by the electronics of the sensor. The measuring signal is independent from the temperature of the measuring water due to an integrated temperature compensation. Surfactants (e. g. tensides) are partially tolerated.
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Instruction Manual for the sensors
TARAtec series “7”
3 Intended use
The sensor has to be inserted in the flow chambers FLC-1 or FLC-3 according to this operating instructions (see section 6). The use of the sensor in other flow chambers has to be released by the manufacturer of the sensor. Otherwise the liability for a proper function of the sensors and personal injury and damage to equipment resulting from that is disclaimed.
The maximum allowed operating pressure of the sensor is 1.0 bar / 10 mwc. The allowed temperature operating range of the sensor is 0 up to <50 °C or <45 °C for the hydrogen peroxide sensors of the type WP7 and peracetic acid sensors PES7. Further operating guidelines see items 13 + 14. The sensors are to be used only for the measurement and control of the concentration of chlorine dioxide / peracetic acid / ozone / hydrogen peroxide.
Only trained and authorised staff should operate the sensor.
Each application beyond this is a not intended use so the warranty becomes void and the liability is disclaimed.
We do not accept liability for injury to persons or damage to property if the operating instructions in this manual have not been followed, or the original state of the sensor has been changed, or the sensor has been used under conditions other than those specified.
If installing the sensor outside Germany, please comply with the corresponding local regulations.
4 Scope of supply
Keep the packaging for the sensor completely. In case of repair or warranty return the sensor in this package.
Check that the delivery is intact. In case of damage please contact your supplier.
Check that the delivery is complete by comparing with the below mentioned scope of supply.
4.1 Sensor with voltage supply (analog-out/analog)
– 4-20mA with 5-pole M12
1
1
1 sensor with membrane cap M7N / M7D or M7N O3 /
M7D O3
1 btl. 100 ml electrolyte ECD4/W-ECD7/W / EPS7/W /
EPS7L/W / EOZ7/W piece of abrasive paper S2 manual
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Instruction Manual for the sensors
TARAtec series “7”
4.2 Sensor with 4-20 mA output (analog-out/analog) with 2-pole terminal
1 sensor with membrane cap M7N / M7D or M7N O3 / M7D O3
1 mA-cap with o-ring 20 x 1.5
1 btl. 100 ml electrolyte ECD4/W-ECD7/W / EPS7/W / EPS7L/W / EOZ7/W
1 piece of abrasive paper S2
1 manual
5 Preparation of the sensor for start up
Safety hint: Some electrolytes contain diluted acids. Please heed the warnings on the electrolyte bottle.
Do not swallow the electrolyte. Avoid contact of the electrolyte with skin and eyes.
Otherwise wash with a lot of water. In case of eye inflammation, contact a doctor.
Filling the membrane cap
Open the box with the membrane cap, empty out the liquid and take the membrane cap. Make sure that only one hose-ring is situated in the groove and closes the vent (see arrow). Then fill the empty membrane cap up to the edge with the electrolyte supplied.
If there are air entrapments in the area of the membrane
(visible with transmitted light), please perform the
“knock method
“ described below.
If necessary: “knock method” to remove air entrapments in the membrane area
Hereby potentially existing air entrapments on the inner side of the membrane can be removed. An air entrapment may interfere the measuring function:
Knock on the filled membrane cap with the electrode shaft until no more air bubbles appear (see picture). This procedure removes air entrapments that may have built up on the inside of the membrane. Then add electrolyte if necessary.
Cleaning of the working electrode
Remove the black protection tube from the electrode finger.
Use the special abrasive paper supplied to clean just the
tip of the dry electrode finger (= working electrode).
Firmly hold the soft pad with the special abrasive paper and rub the electrode tip of the slightly inclined probe over the abrasive paper. Then turn the probe a bit around its axis and rub again over the abrasive paper. Repeat this procedure several times.
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Instruction Manual for the sensors
TARAtec series “7”
Assembling of the sensor
Hold the electrode shaft upright and place it onto filled membrane cap.
Turn it anticlockwise until the thread engages, then screw the electrode shaft clockwise (by hand) slowly onto the membrane cap.
Excess electrolyte will escape through a valve (located above the type marking) in the membrane cap. Do not close this vent (see arrow)!
Caution: The electrolyte may spurt from the vent.
Excess electrolyte or electrolyte which gets on your skin or in your eye wash up with water.
Some electrolytes contain diluted acids. Please heed the warnings on the electrolyte bottle.
Make sure that the membrane cap is tightly fastened to the electrode shaft! Wash up the excess electrolyte with water.
Important:
Check whether the membrane cap is completely screwed in up to the stop. The first screw-in resistance comes from the
O-ring seal; however the screwing procedure of the cap must be continued until it hits the electrode shaft!
When the membrane cap has been screwed on, the membrane is curved to the outside and must not be thumped any more, as this will damage the membrane and thus make it unusable.
Caution: When the filled membrane cap is completely screwed onto the electrode shaft it is not allowed to touch or to adjoin the membrane!
Then also push the second hose-ring into the deepening over the first one. Make sure that the hose-rings do not pucker!
Unscrewing the membrane cap
Important: When unscrewing the filled membrane cap, the two hoserings must be pushed to the side above the type marking to allow air to stream into the electrolyte chamber; otherwise the membrane will be destroyed!
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Instruction Manual for the sensors
TARAtec series “7”
6 Insertion of the sensor in the flow chambers FLC
Depressurise the system before inserting the sensor into the flow chamber. Close the stop valves before and after the flow chamber.
Insertion of the sensor into the flow chamber should be carried out slowly.
The sensor is not allowed to be pushed against the bottom of the flow chamber!
Warning: A sudden failure of the sensor may lead to a very dangerous overdosing of the disinfectant
– please provide preventative measures. In case of a very high overdose, the titration may be imprecise as the titration volume gets too large or the DPD-measuring may remain colourless, as the colorant will be bleached by the disinfectant respectively.
Recommendations: e. g. dosage volume monitoring, dosage time monitoring, limit value monitoring.
Safety hint: Please make sure that the sensor is tightly fastened in place!
Otherwise it may be pressed out of the flow chamber when it is under pressure.
Operating mode Flow chamber
Operating pressure max.
Operating temperature max.
Flow rate l/h
IMPORTANT:
!! Heed and comply with the max. allowed operating pressure
/ operating temperature of the sensor !!
Operation of the sensor without retaining ring
FLC-1
FLC-3
0.5 bar (5 mWS)
45 °C
70 °C
15 (45)
45 (15)
Operation of the sensor with retaining ring
FLC-1 4.0 bar (40 mWS) 45 °C 15 (45)
FLC-3 8.0 bar (80 mWS) 70 °C 45 (15)
6.1 Mounting with retaining ring
For the installation of the sensor in the flow chamber the sensor can be equipped with retaining ring, slide-ring and O-ring by the manufacturer (see fig. 1). For installation of the sensor in the flow chamber unscrew the 1 ¼” screw-connection from the flow chamber. Prepare the sensor according section 5.
Make sure that retaining ring, slide-ring and O-ring are properly fixed according fig. 1.
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Instruction Manual for the sensors
TARAtec series “7”
Fig. 1: Fig. 2:
1_17_02_ZB.skd
Anschlußbuchse connector
Elektrodenschaft mit integrierter Elektronik electrode shaft with amplifier
Sicherungsring, retaining ring
Gleitring, slide ring
O-Ring
Insert the sensor according fig. 2 into the flow chamber. Push the earlier unscrewed 1 ¼” screwconnection carefully over the inserted sensor and fasten it tightly, otherwise leaks may occur.
First open the measuring water outlet. Then open slowly the measuring water supply.
Avoid installations that allow air bubbles to enter the measuring water.
6.2 Mounting without retaining ring
If the sensor is not equipped with retaining ring, slide-ring and o-ring it can also be installed in the flow chamber by using an o-ring and 2 slide rings. The second slide ring has to be used instead of the retaining ring. Loosen the 1 ¼” screw-connection of the flow chamber. Insert the sensor (after preparation according section 5) into the flow chamber until the distance between the membrane and the inflowopening is approx. 2 cm. Fasten the 1 ¼” screw-connection tightly. Please make sure that the sensor is tightly fastened in place, otherwise it may be pressed out of the flow chamber when it is under pressure and / or leaks may occur.
First open the measuring water outlet. Then open slowly the measuring water supply.
Avoid installations that allow air bubbles to enter the measuring water.
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Instruction Manual for the sensors
TARAtec series “7”
7 Startup of the sensor
Connect the sensor with the measuring device.
Connection of sensors with
0…+/-2000 mV signal output
4 pole connector, reverse polarity protection, symmetrical or unipolar power supply pin configuration:
1 (socket) +U
2 (socket) -U or voltage GND
3 (PIN) GND or Signal GND
4 (PIN) signal output
Connection of mA-sensors with 2-pole terminal
2-pole terminal clamp
Push the sensor cable through the black cable gland of the cap.
Then fasten the wires in the terminals of the sensor electronics. By hand, screw the cap only now onto the sensor body/shaft until the oring seals. Now tighten the black cable gland (fixing the cable). For disconnection untighten the black cable gland first to release the cable.
Recommended cable: diameter approx. 4 mm, 2 x 0.25 mm².
Connection of mA-sensors with 5-pole M12 plug-on flange
5 pole screw-connector, M12, reverse polarity protection pin configuration: PIN 2: +U
PIN 3: -U
As a rule the sensor is run in after about 3 hours so that a first adjustment can be made. The run-in period of the OZ7 can take up to 5 hours or longer. The adjustment has to be repeated after approx. one day. If there is some disinfectant in the measuring water it benefits the run-in period.
For proper function of the sensor the slope adjustment has to be repeated in regular intervals.
8 Control of the sensor / Analytics
A balance or checking of the probe using DPD-method or sulphuric titration with potassium permanganate and if necessary sodium thiosulfate respectively, is recommended. This should be performed regularly depending on utilization.
Recommendation: weekly check, if necessary more frequently.
The titrated value is adjusted by means of slope calibration function of the controller (see Operation
Manual of the Controller).
We recommend to replace the electrolyte every 3 - 6 month.
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Instruction Manual for the sensors
TARAtec series “7”
8.1 Analytics chlorine dioxide
Provided that there are no other oxidants present in the measuring water, e. g. chlorine and ozone, chlorine dioxide can be determined in the same way as “free chlorine” (DPD-1). The result of this determination has to be multiplied by the factor 1.9, which shows the concentration in mg/l of chlorine dioxide.
8.2 Analytics peracetic acid
The determination of the peracetic acid concentration should be performed by using sulphuric titration with potassium permanganate and sodium thiosulfate.
8.3 Analytics ozone
Provided that there are no other oxidants in the measuring water, e. g. chlorine and chlorine dioxide, ozone can be determined by DPD-method. For this, a DPD total chlorine determination has to be done
(DPD-4 or DPD-1 + DPD-3). The measuring value obtained has to be multiplied by a factor of 0.68, which shows the ozone concentration in mg/l. This method can be used for ozone concentrations up to
1 mg/l.
8.4 Analytics hydrogen peroxide
The determination of the hydrogen peroxide concentration should be performed by using one-level sulphuric titration with potassium permanganate.
8.5 Sensors with 2-pole terminal + CE-mark (4-20mA)
Factory provided the potentiometer sideways to the 2-pole-connector is adjusted on the measuring range which is specified on the label. This adjustment is secured by a sealing wax. The setting of the potentiometer should not be changed.
9 Disassembling of the sensor
Switch of secondary measuring and/or control systems or switch them to manual operation before dismantling the sensor. A disassembled sensor results in an incorrect measuring value, which may cause an uncontrolled dosing within a control system.
Lock the measuring water supply at first and after that the outlet. Disconnect the sensor from the device.
Disconnection of sensors with 2-pole terminal: First untighten the PG screw-connection so that the cable is released. Unscrew the cap from the sensor.
Then disconnect the wires from the 2-pole-terminal.
Untighten the screw-connection and pull out the sensor carefully.
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Instruction Manual for the sensors
TARAtec series “7”
10 Maintenance of the sensor
Caution: The brown coating of the electrode finger must not be emeried!!
Do not unscrew the metallic membrane holder from the cap as this will damage the membrane.
Check the sensor regularly for dirt, algae and bubbles. As far as possible avoid contamination of the membrane with solid particles, deposits etc. Bubbles on the outside of the membrane can be eliminated by increasing the flow rate temporary.
A slope adjustment has to be made after a change of the membrane cap or the electrolyte.
10.1 Change of electrolyte
Recommendation: Change the electrolyte every 3
– 6 months. And also, if an adjustment is impossible due to unstable or too low values displayed.
Lift the two hose rings on the membrane cap above the type marking sealing the vent sideways so that the opening is free (see fig. 3). The membrane cap is unscrewed and then air streams into the uncovered vent. The electrode finger is cleaned with a clean, dry paper towel. With the special abrasive paper supplied just the tip of the dry electrode finger (= working electrode) is cleaned. Place the special abrasive paper on paper towel, hold it at one corner and rub the electrode tip of slightly inclined probe two or three times across the abrasive paper (see fig. 4). Replace one hose ring in the deepening and prepare the sensor according item 5 for installation: fill with electrolyte, if necessary knock with the sensor shaft onto the membrane cap to remove air entrapments on the inner side of the membrane that might have built up (see fig. 5 “knock-method”), add electrolyte if necessary, screw on the membrane cap, replace the second hose ring into the deepening.
If the sensor still displays unstable or too low values, a new membrane cap must be used.
10.2 Change of membrane cap
Recommendation: Change of the membrane cap once a year. And also, if an adjustment is impossible due to unstable or too low values displayed.
Lift the two hose rings on the membrane cap above the type marking sealing the vent sideways so that the opening is free (see fig. 3). The membrane cap is unscrewed and then air streams into the uncovered vent. The electrode finger is cleaned with a clean, dry paper towel. With the special abrasive paper supplied just the tip of the dry electrode finger (= working electrode) is cleaned. Place the special abrasive paper on paper towel, hold it at one corner and rub the electrode tip of slightly inclined probe two or three times across the abrasive paper (see fig. 4). Take a new membrane cap and fill with electrolyte, if necessary knock with the sensor shaft onto the membrane cap to remove air entrapments on the inner side of the membrane that might have built up (see fig. 5 “knock-method”).
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Instruction Manual for the sensors
TARAtec series “7”
If the sensor still displays unstable or too low values, a check / reconditioning by the manufacturer has to be done.
Note: When starting up a new membrane cap with an ozone sensor (M7N O3, M7D O3) the run-in period may take up to 24 hours until 100% of the measuring signal is reached.
Fig. 3: Fig. 4: Fig. 5:
11 Storage
To store the sensor the membrane cap is unscrewed and the G-Holder removed with the tweezers.
Membrane cap and electrode finger are rinsed in clean water and dried in a place free of dust. The dry membrane cap is then loosely screwed onto the electrode shaft to protect the electrode finger. The membrane must not rest against the measuring electrode.
When putting the sensor back into use after storage, the electrode tip must be cleaned with the special abrasive paper and a new membrane cap with new G-Holder must be used (see item 5).
Used membrane caps which have been in operation for at least 1 day cannot be stored and reused.
12 Electrical specifications
The sensors have to be operated potentialfree. A current flow between the sensors and the measuring water is not allowed. Therefore the measuring and control devices must be supplied with a galvanical isolation. When a 4-20 mA current loop is present a galvanical isolation can be achieved by using a isolating amplifier.
The sensors are only allowed to be operated with the specified voltage supply.
Ensure that the supply voltage of the measuring and/or control device is stable. Too low a voltage supply can cause incorrect measuring values, which may result in dangerous overdosing within a control system.
NOTE: A potential-free electrical connection is necessary as the sensor electronic is not equipped with a galvanical isolation.
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page 12 of 27
Instruction Manual for the sensors
TARAtec series “7”
12.1 Chlorine dioxide sensor CD7 / Ozone sensor OZ7
Type N / H / L Up / HUp
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MA-x
Voltage supply
±5 … ±15 V DC
Power consumption
EMC-Testing DIN EN 61326-1
RoHS compliant
+10
…+30 V DC
12 V DC
(load resistor: max. 50
)
Up to
30 V DC
(load resistor: 50
until 900
) approx. 10 mA approx. 4 mA
(max. current by overloading: approx. 30 mA)
Signal transmission
Analog signal output
(mV per mg/l)
N: appr. -100
H: appr. -1000
L: appr. -10
Analog signal output
(mV per mg/l)
Up: appr. +100
HUp: appr. +1000
Analog signal output
4
– 20 mA (uncalibrated)
(16 mA/measuring range in ppm
= nominal slope in mA/ppm)
Internal signal processing analog
Measuring range
(mg/L)
N:
0.05… appr. 20.00
H:
0.005…appr. 2.000
L:
0.5… appr. 200.0
Up:
0.05
…
appr.
20.00
HUp:
0.005
…
appr.
2.000
x = Measuring range
in mg/L
(e. g. OZ7MA2: Measuring range up to 2 mg/L ozone)
Connection information
4-pole screw connector
Ground power supply and ground signal are the same
connections are protected against polarity reversal
4-pole screw connector
power supply is gal vanically isolated
connections are protected against polarity reversal
2-pole terminal or 5pole M12 plug-on flange
connection is pro tected against polarity reversal
the 4-20 mA connection to the device also supplies the sensor with current
slope adjustment at the device necessary
(Subject to technical changes!) page 13 of 27
Instruction Manual for the sensors
TARAtec series “7”
12.2 Peracetic acid sensor PES7 / Hydrogen peroxide sensor WP7
Type N / H / L Up / HUp MA-x
Voltage supply
Power consumption
Signal transmission
±5 … ±15 V DC
EMC-Testing DIN EN 61326-1
RoHS compliant
+10 …+30 V DC
12 V DC
(load resistor: max. 50
)
Up to
30 V DC
(load resistor: 50
until 900
) approx. 10 mA approx. 4 mA
(max. current by overloading: approx. 30 mA)
Analog signal output
(mV per ppm)
N: appr. -1
H: appr. -10
L: appr. -0,1
Analog signal output
(mV per ppm)
Up: appr. +1
HUp: appr. +10
Analog signal output
4
– 20 mA
(uncalibrated)
(16 mA/measuring range in ppm
= nominal slope in mA/ppm)
Internal signal processing
Measuring range
(ppm)
N:
0.05… appr. 2000
H:
0.005…appr. 20
L:
0.5… appr. 2 %
Up:
0.05
…
appr.
2000
HUp:
0.005
analog
…
appr.
200 x = Measuring range
in mg/L
(e. g. PES7MA-CC: Measuring range up to 200 mg/L peracetic acid)
Connection information
4-pole screw connector
Ground power supply and ground signal are the same
connections are protected against polarity reversal
4-pole screw connector
power supply is galvanically isolated
connections are protected against polarity reversal
2-pole terminal or 5-pole
M12 plug-on flange
connection is protected against polarity reversal
the 4-20 mA connection to the device also supplies the sensor with current
slope adjustment at the device necessary
(Subject to technical changes!)
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page 14 of 27
Instruction Manual for the sensors
TARAtec series “7”
13 Technical Data
Data sheets are available for each type of sensor.
13.1 Chlorine dioxide sensor CD7
Application
All kinds of water treatment, also sea water
(e. g. bottle washing machine, CIP-plants)
Membrane covered, amperometric 2-electrode system Measuring system
Electronic
Information about the measuring range of sensors with 4-20 mA indicator
Analog version: - voltage output
- not galvanically isolated electronics
- analog internal data processing
- output signal: analog (analog-out/analog) mA-version: - current output analog
- not galvanically isolated electronics
- output signal: analog (analog-out/analog)
- only valid for sensors with 2-pole-terminal &
CE-mark: poti for (restricted) adjustment of
measuring range
Slope of a sensor can vary production-related or application-related between
65% and 150% of the nominal slope
-> Recommendation to determine the suitable measuring range or the suitable sensor:
Concentration to be measured x factor 1.5 = measuring range of the sensor
Example: Concentration to be measured 1.6 ppm x 1.5 = 2.4
-> recommended sensor with a measuring range of 5 ppm
Chlorine dioxide
Working temperature
Temperature compensation
0
– <50 °C (no ice crystals in the measuring water)
Automatically, by an integrated temperature sensor
Temperature changes <5 °C
Max. allowed working pressure 1,0 bar, no pressure impulses and/or vibrations
Flow rate pH-range
Run-in time approx. 30L/h, small flow rate dependence is given pH 1
– pH 11
First start-up approx. 1 h
Response time
Zero point adjustment
Slope calibration interferences
Connection
T
90
: approx. 1,5 min.
Not necessary
At the device, by analytical determination
Cl
2
: does not disturb
O
3
: is measured with a sensitivity 25-times higher than ClO
2 analog-out/analog version: 4-pole plug adapter
4-20 mA version: 2-pole terminal (2 x 1 mm²) or
5-pole M12, plug-on flange
(PIN2: +U, PIN3: -U) material PVC-U, stainless steel 1.4571
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Instruction Manual for the sensors
TARAtec series “7”
Size diameter:
Length: analog-out/analog version
4-20 mA version approx. 25 mm approx. 175 mm approx. 220 mm
(2-pole-terminal) approx. 190 mm
(5-pole-M12) storage
Probe: Frost-protected, dry and without electrolyte no limit at
>5 - <40 °C
Membrane cap: Used membrane caps cannot be stored!
Electrolyte: in original bottle protected from sunlight min. 1 year at
>10 - <35 °C maintenance
Regularly control of the measuring signal, min. once a week
The following specifications depend on the water quality:
Change of the membrane cap: once a year
Change of the electrolyte: every 3 - 6 months
13.2 Peracetic acid sensor PES7
Application
All kinds of water treatment, also sea water
Conductivity acids are tolerated, water must not contain any surfactants
(tensides)
(e. g. bottle washing machine, CIP-plants)
Measuring system
Electronic
Information about the measuring range of sensors with 4-20 mA
Membrane covered, amperometric 2-electrode system
Analog version: - voltage output
- not galvanically isolated electronics
- analog internal data processing mA-version:
- output signal: analog (analog-out/analog)
- current output analog
- not galvanically isolated electronics
- output signal: analog (analog-out/analog)
- only valid for sensors with 2-pole-terminal &
CE-mark: poti for (restricted) adjustment of
measuring range
Slope of a sensor can vary production-related or application-related between
65% and 150% of the nominal slope
-> Recommendation to determine the suitable measuring range or the suitable sensor:
Concentration to be measured x factor 1.5 = measuring range of the sensor
Example: Concentration to be measured 1.6 ppm x 1.5 = 2.4
-> recommended sensor with a measuring range of 5 ppm indicator Peracetic acid
Working temperature
Temperature compensation
0
– 45 °C (no ice crystals in the measuring water)
Automatically, by an integrated temperature sensor
Temperature changes <5 °C
Max. allowed working pressure 1,0 bar, no pressure impulses and/or vibrations
Flow rate pH-range
Run-in time
Response time
Zero point adjustment approx. 30L/h, small flow rate dependence is given pH 1
– pH 6
First start-up approx. 1 h
T
90
: approx. 3 min.
Not necessary
Slope calibration At the device, by analytical determination
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Instruction Manual for the sensors
TARAtec series “7”
interferences
O
3
: is measured with a factor of 2.500 of its measuring value
ClO
2
: is measured with a factor of 1 of its measuring value
H
2
O
2
: is measured with a factor of 0,005 of its measuring value analog-out/analog version: 4-pole plug adapter
4-20 mA version:
Connection
2-pole terminal (2 x 1 mm²) or
5-pole M12, plug-on flange
(PIN2: +U, PIN3: -U) influence of conductivity acids material
Size storage maintenance
1 % sulfuric acid or 1 % nitric acid in the water have no influence on the sensor or the measuring behaviour respectively.
PVC-U, stainless steel 1.4571 diameter:
Length: analog-out/analog version
4-20 mA version approx. 25 mm approx. 175 mm approx. 220 mm
(2-pole-terminal) approx. 190 mm
(5-pole-M12)
Probe: Frost-protected, dry and without electrolyte no limit at
>5 - <40 °C
Membrane cap: Used membrane caps cannot be stored!
Electrolyte: in original bottle protected from sunlight min. 1 year at
>10 - <35 °C
Regularly control of the measuring signal, min. once a week
The following specifications depend on the water quality:
Change of the membrane cap: once a year
Change of the electrolyte: every 3 - 6 months
13.3 Ozone sensor OZ7
Application
Measuring system
All kinds of water treatment, also sea water
Tensides are tolerated.
(e. g. bottle washing machine, CIP-plants)
Membrane covered, amperometric 2-electrode system
Electronic
Information about the measuring range of sensors with 4-20 mA
Analog version: - voltage output
- not galvanically isolated electronics
- analog internal data processing
- output signal: analog (analog-out/analog) mA-version: - current output analog
- not galvanically isolated electronics
- output signal: analog (analog-out/analog)
- only valid for sensors with 2-pole-terminal &
CE-mark: poti for (restricted) adjustment of
measuring range
Slope of a sensor can vary production-related or application-related between
65% and 150% of the nominal slope
-> Recommendation to determine the suitable measuring range or the suitable sensor:
Concentration to be measured x factor 1.5 = measuring range of the sensor
Example: Concentration to be measured 1.6 ppm x 1.5 = 2.4
-> recommended sensor with a measuring range of 5 ppm indicator ozone
Working temperature 0
– <50 °C (no ice crystals in the measuring water)
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Instruction Manual for the sensors
TARAtec series “7”
Temperature compensation
Automatically, by an integrated temperature sensor
Temperature changes <5 °C per hour
Max. allowed working pressure 1,0 bar, no pressure impulses and/or vibrations
Flow rate pH-range
Run-in time approx. 30L/h, small flow rate dependence is given pH 2
– pH 11
First start-up approx. 1 h
Response time
Zero point adjustment
Slope calibration interferences
Connection
T
90
: approx. 50 sec.
Not necessary
At the device, by analytical determination
Cl
2
: OZ7H: increases the measuring value about 1,5 %
OZ7N: negligible
ClO
2
: OZ7N: increases the measuring value about 6 % analog-out/analog version: 4-pole plug adapter
4-20 mA version: 2-pole terminal (2 x 1 mm²) or
5-pole M12, plug-on flange
(PIN2: +U, PIN3: -U) material
Size storage maintenance
PVC-U, stainless steel 1.4571 diameter:
Length: analog-out/analog version
4-20 mA version approx. 25 mm approx. 175 mm approx. 220 mm
(2-pole-terminal) approx. 190 mm
(5-pole-M12)
Probe: Frost-protected, dry and without electrolyte no limit at
>5 - <40 °C
Membrane cap: Used membrane caps cannot be stored!
Electrolyte: in original bottle protected from sunlight min. 1 year at
>10 - <35 °C
Regularly control of the measuring signal, min. once a week
The following specifications depend on the water quality:
Change of the membrane cap: once a year
Change of the electrolyte: every 3 - 6 months
13.4 Hydrogen peroxide sensor WP7
Application
Measuring system
Electronic
All kinds of water treatment, also sea water
(e. g. bottle washing machine, CIP-plants)
Membrane covered, amperometric 2-electrode system
Analog version: - voltage output
- not galvanically isolated electronics
- analog internal data processing mA-version:
- output signal: analog (analog-out/analog)
- current output analog
- not galvanically isolated electronics
- output signal: analog (analog-out/analog)
- only valid for sensors with 2-pole-terminal &
CE-mark: poti for (restricted) adjustment of
measuring range
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Instruction Manual for the sensors
TARAtec series “7”
Information about the measuring range of sensors with 4-20 mA
Slope of a sensor can vary production-related or application-related between
65% and 150% of the nominal slope
-> Recommendation to determine the suitable measuring range or the suitable sensor:
Concentration to be measured x factor 1.5 = measuring range of the sensor
Example: Concentration to be measured 1.6 ppm x 1.5 = 2.4
-> recommended sensor with a measuring range of 5 ppm indicator Hydrogen peroxide
Working temperature
Temperature compensation
0
– <45 °C (no ice crystals in the measuring water)
Automatically, by an integrated temperature sensor
Temperature changes <5 °C
Max. allowed working pressure 1,0 bar, no pressure impulses and/or vibrations
Flow rate pH-range
Run-in time
Response time
Zero point adjustment
Slope calibration interferences
Connection approx. 30L/h, small flow rate dependence is given pH 2
– pH 11
First start-up approx. 3 h
T
90
: approx. 5 min. …10 min.
Not necessary
At the device, by analytical determination
Cl
2
: must not be present
PAA: must not be present
O
3
: must not be present
Sulfides: contaminate the measuring system
Phenol: aqueous solution >3 % phenol, destroys the membrane system analog-out/analog version: 4-pole plug adapter
4-20 mA version: 2-pole terminal (2 x 1 mm²) or
5-pole M12, plug-on flange
(PIN2: +U, PIN3: -U) material
Size storage maintenance
PVC-U, stainless steel 1.4571 diameter:
Length: analog-out/analog version
4-20 mA version approx. 25 mm approx. 175 mm approx. 220 mm
(2-pole-terminal) approx. 190 mm
(5-pole-M12)
Probe:
Electrolyte:
Frost-protected, dry and without electrolyte no limit at
>5 - <40 °C
Membrane cap: Used membrane caps cannot be stored! in original bottle protected from sunlight min. 1 year at
>10 - <35 °C
Regularly control of the measuring signal, min. once a week
The following specifications depend on the water quality:
Change of the membrane cap: once a year
Change of the electrolyte: every 3 - 6 months
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Instruction Manual for the sensors
TARAtec series “7”
14 General operating guidelines
The sensor has to be operated in an upright position, so that the incoming flow comes from the bottom up to the membrane.
During unpressurised operation with free outflow of the measuring water air bubbles have no disturbing effect unless they cover the membrane. Air bubbles at the membrane obstruct the inflow of the disinfectant, which leads to incorrect measuring signals.
The flow rate must be constant.
The membrane life is typically one year, but can vary considerably depending on the water quality.
Heavy contamination of the membrane should be avoided.
Each sensor has been tested and the results are documented.
During interval operation of the measuring system / plant the sensor is not allowed to be disconnected from the power supply. The sensor must be connected to the power supply all the time. The sensor must not be allowed to stand dry.
The sensor is not allowed to be operated in water that is free of disinfectant for a longer period
(>1 day). Danger: build-up of sediments/contaminations (e. g. biological) on the membrane. This can interfere or block a later measurement of the disinfectant.
After any operation without disinfectant, run-in periods must be reckoned with. If required, switch on metering unit time-delayed.
If no disinfectant is dosed for a longer period of time, the sensor must be disconnected from the device, disassembled and stored dry (see section 11).
The presence of reducing-, oxidising reagents and corrosion inhibitors may interfere with the measurement.
15 Spare Parts
Membrane caps Electrolyte
M7N (Art. No. 11014)
PES7H, PES7N, PES7Up, PES7Un, PES7MAx (x=D, M, MM)
CD7H, CD7N, CD7Up, CD7HUp, CD7HUn,
CD7MAx (x=0.5 / 2 / 5 / 10)
WP7HUn, WP7Un, WP7Up, WP7HUp,
WP7MAx (x=CC, D, MM)
M7D (Art. No. 11015)
EPS7/W
(Art. No. 11020)
ECD4/W - ECD7/W
(Art. No. 11030)
EWP7/W
(Art. No. 11201)
WP7MA-XM
EWP7/W
(Art. No. 11201)
M7L (Art. No. 11010)
PES7L, PES7Up5000, PES7MA-XM
WP7LUn, WP7Up-CM, WP7CUn, WP7MA-x (x=XXM, LM, CM)
EPS7L/W
(Art. No. 11022)
EWP7/W
(Art. No. 11201)
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Instruction Manual for the sensors
TARAtec series “7”
M7N O3 (Art. No. 11018)
OZ7H, OZ7MA0.2, OZ7MA0.5
EOZ7/W
(Art. No. 11102)
M7D O3 (Art. No. 11017)
OZ7N, OZ7Up, OZ7MA2, OZ7MA5, OZ7MA10
EOZ7/W
(Art. No. 11102)
16 Trouble Shooting
Trouble shooting must take account of the whole measuring circuit system from the extraction point to drain. In general, the measuring system consists of:
sensor
electrical leads and its connectors
measuring and control device
flow chambers with hose connections / pipe connections
16.1 General Troubleshooting
Fault Possible Cause Action
Sensor cannot be calibrated / deviation of the measuring value from titration result
Run-in time too short
Membrane cracked
Membrane cap damaged
Interfering substances in the measuring water
Short-circuit / damage in the signal lead
Distance between working electrode and membrane is too great
See item 5, repeat calibration after several hours
Replace membrane cap, see item 10.2
Replace membrane cap, see item 10.2
Examine the measuring water for interfering substances and remedy, if necessary consult supplier
Locate and eliminate shortcircuit / defect, if necessary change the measuring cable
Screw the membrane cap tightly onto the shaft until it hits the shaft
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Instruction Manual for the sensors
TARAtec series “7”
DPD-/titration chemicals spent Use new DPD-/titration chemicals, repeat calibration
Only valid for peracetic acid:
Improper method of titration
Deposits on the membrane
Repeat titration with an appropriate method (with a minimal titration volume)
With a soft brush (e. g. toothbrush) and scoring agent remove deposits carefully
Otherwise replace membrane cap, see item 10.2
Air bubbles on the outside of the membrane
Increase the flow rate temporary, if necessary check installation and revise it
Air entrapments on the inner side of the membrane
Knock with the electrode shaft on the membrane cap until no air bubbles bubble up anymore
(see paragraph 5 “knock method”)
Sensor defective
Return the sensor to the manufacturer for check/reconditioning
No electrolyte in the membrane cap
Fill membrane cap with electrolyte and follow the instructions of item 5 concentration of the disinfectant exceeds the upper limit of the measuring range
Check the whole system, remedy fault, repeat calibration
Measuring signal is not stable
Membrane cracked
Air Bubbles in the electrolyte
Replace membrane cap, see item 10.2
Empty out the membrane cap and refill it carefully with new electrolyte without bubbles, see item 10.1
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Instruction Manual for the sensors
TARAtec series “7”
Air bubbles on the outside of the membrane
Increase the flow rate temporary, if necessary check installation and revise it
Air entrapments on the inner side of the membrane
Knock with the electrode shaft on the membrane cap until no air bubbles bubble up anymore
(see paragraph 5 “knock method”)
Pressure fluctuations in the measuring water
Reference electrode exhausted and/or contaminated
Check installation, if necessary revise it
Return sensor for reconditioning to the manufacturer
Only for MA-sensors:
Output signal is 0
Sensor is connected to the measuring and/or control device with wrong polarity
Signal lead is broken
Sensor defective
Measuring and/or control device defective
Correctly connect the sensor to the measuring and/or control device
Replace signal lead
Return the sensor to the manufacturer for check/reconditioning
Check the measuring and/or control device
16.2 Special troubleshooting for sensor
When the electrode finger turns shiny silver or white the sensor must be reconditioned by the manufacturer.
Tightness check of membrane cap
Membrane cap M7N / M7N O3, M7D / M7D O3, M7L
1. Thoroughly dry the outside of the membrane cap to be checked
2. Prepare membrane cap according to instruction manual and fill with electrolyte or clean water
3. Dry the outside of the membrane cap again if necessary
4. Slowly and carefully screw membrane cap on sensor according to the instruction manual
5. When screwing the membrane cap on, check if liquid leaks through the membrane
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Instruction Manual for the sensors
TARAtec series “7”
CAUTION:
Thoroughly check if liquid leaks through the membrane or exits at the designated points. If necessary, repeat tightness check.
-> If dripping can be observed at the membrane, the membrane is damaged and a new membrane cap must be used.
-> Check if the reference electrode was damaged by the exchange from measuring water to electrolyte. If it is not intact anymore, the sensor must be send back to the manufacturer for testing.
Check of the electronic system
(dry test)
Zero point check
1. Unscrew membrane cap
2. Thoroughly rinse off electrode finger and dry carefully using clean cloth
3. Connect sensor to measurement/control device and wait for approx. 5 min.
4. Take readings of original sensor signal from measurement/control device or measure using a digital multimeter
A) Sensor (mV): approx. +/- 0 mV
B) Sensor (mA): approx. 4 mA
C) Sensor (µA): approx. 0 µA
-> If the sensor signal approximately corresponds to the above mentioned values, the electronic system is likely to be ok.
-> If the measured value significantly deviates from the above mentioned values, the sensor must be send back to the manufacturer for testing.
After the check of the electronic system
1. Prepare sensor for start-up according to section 5 of the instruction manual
2. Connect sensor to measurement/control device
3. Place sensor carefully into a beaker filled with clean tab water (free from disinfectant!)
4. Stir for approx. 30 sec. using sensor in beaker (without causing air bubbles)
5. Then leave the sensor in the beaker and wait until the run-in time has passed (at least for 1 hour)
6. Take readings of original sensor signal from measurement/control device or measure using a digital multimeter
7. The sensor signal should approach zero.
-> If the sensor signal approaches zero, the zero point is likely to be ok.
-> If the measured value deviates significantly from zero, maintenance must be carried out on the sensor according to section 10 of the instruction manual and the zeropoint check must be repeated. It has to be taken into account that a freshly cleaned working electrode (measuring electrode) has a relatively high zero point. The sensor needs a few days to reach its lowest zero point again.
-> If the measured value does not approach zero even after maintenance was carried out, the sensor must be send back to the manufacturer for testing.
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Instruction Manual for the sensors
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Note:
For sensors with very limited measurement ranges or high sensitivity, the zero points are always slightly above those of sensors with larger measurement ranges or low sensitivity.
Signal check After zero point check
1. Add some disinfectant to the beaker filled with clean tab water from section “zero point check“
2. Stir as steadily as possible using the sensor connected to the measurement device for at least 5 min.
3. During this time, you should observe an increase of the measuring signal
-> If the sensor signal increases, the sensor is likely to be ok. If the sensor does not react to the disinfectant, maintenance must be carried out on the sensor according to section 10 of the operating instructions and the “signal check” must be repeated.
-> If the sensor still does not react to the disinfectant, the sensor must be send back to the manufacturer for testing.
Periphery check e. g.
1. Check flow
2. Check measuring cable
3. Check measurement/control device
4. Check proper calibration
5. Check dosing unit
6. Check concentration of disinfectant in the dosing tank
7. Check suitability of sensor for measuring the dosed disinfectant
8. Check concentration of disinfectant in the measuring water (analytics)
9. Check pH value of the measuring water
10. Check temperature of measuring water
11. Check pressure in the flow fittings
12. Check analytics
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Instruction Manual for the sensors
TARAtec series “7”
17 Warranty
We grant a manufacturer’s warranty of two years on the electrode body including the electronics subject to appropriate application. The warranty does not apply to the membrane cap (wearing part), electrolyte (consumable material) and service work to be performed.
(Cleaning of the parts in contact with the electrolyte, renewing the silver chloride coating of the electrode finger and cleaning of the electrode tip with special abrasive paper). Should there be mechanical damage or should the serial number be illegible, the warranty becomes void.
Return of a sensor for check/reconditioning: Only shipments are accepted that are returned with carriage paid. Otherwise they will be returned to the sender.
On checked/reconditioned sensors we grant a warranty of one year on the electrode body including the electronics subject to appropriate application from the date of check/reconditioning. Should there be mechanical damage or should the serial number be illegible, this warranty becomes void.
18 Liability disclaimer
The sensors are manufactured with the greatest care and is subjected to a documented function test.
Should any malfunctions occur in the sensor despite this, no liability claims may be lodged against the manufacturer in case of damage resulting from this malfunction.
Subject to technical changes!
Reiss GmbH
Elektrochemische Messtechnik
Eisleber Str. 5
D - 69469 Weinheim
Tel. + 49(0)6201/25939-0
Fax + 49(0)6201/25939-10
www.reiss-gmbh.com
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Instruction Manual for the sensors
TARAtec series “7”
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