Hach-Lange NO3D sc User Manual
DOC023.52.90140
NO3D sc Nitrate Sensor
USER MANUAL
12/2008, Edition 1A
© HACH -LANGE Company, 2008. All rights reserved. Printed in Germany
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Table of Contents
Section 1 Specifications ........................................................................................................................ 5
1.1 Dimensions ................................................................................................................................... 6
Section 2 General Information............................................................................................................... 7
2.1 Safety information......................................................................................................................... 7
2.1.1 Use of hazard information.................................................................................................... 7
2.1.2 Precautionary labels ............................................................................................................ 7
2.2 General sensor information........................................................................................................... 8
2.3 Theory of operation....................................................................................................................... 9
Section 3 Installation............................................................................................................................ 11
3.1 Unpacking the sensor ................................................................................................................. 11
3.2 Unpacking the sensor cartridge .................................................................................................. 11
3.3 Sensor assembly ........................................................................................................................ 13
3.4 Installation of the cleaning unit (optional).................................................................................... 15
3.5 Installation of the sensor in the sample flow ...............................................................................15
3.6 Connect the sensor to the sc controller (non-hazardous location) with quick-connect fittings.... 17
Section 4 Operation..............................................................................................................................19
4.1 Using an sc controller ................................................................................................................. 19
4.2 Sensor setup............................................................................................................................... 19
4.3 Sensor data logging....................................................................................................................19
4.4 Sensor diagnostics menu............................................................................................................ 19
4.5 Sensor setup menu..................................................................................................................... 20
4.6 Calibration................................................................................................................................... 22
4.6.1 Sensor code calibration ..................................................................................................... 22
4.6.2 Matrix correction overview ................................................................................................. 23
4.6.3 Matrix correction ................................................................................................................ 24
4.6.3.1 MATX1 correction (one point matrix correction)........................................................ 24
4.6.3.2 MATX1 CL- correction............................................................................................... 24
4.6.3.3 MATX2 correction (2nd point matrix correction)........................................................ 25
4.6.3.4 MATX2 CL- correction............................................................................................... 26
4.6.3.5 Value correction ........................................................................................................27
Section 5 Maintenance ......................................................................................................................... 29
5.1 Maintenance schedule................................................................................................................ 29
5.2 Clean the sensor......................................................................................................................... 29
5.2.1 Polish the chloride electrode.............................................................................................. 29
5.3 Replace the sensor cartridge...................................................................................................... 30
5.4 Storage ....................................................................................................................................... 32
Section 6 Troubleshooting................................................................................................................... 33
6.1 Error codes ................................................................................................................................. 33
6.2 Warning codes............................................................................................................................ 33
6.3 Troubleshooting ......................................................................................................................... 34
6.3.1 Troubleshooting during operation ...................................................................................... 34
6.3.2 Troubleshooting during calibration..................................................................................... 36
Section 7 Spare Parts and Accessories.............................................................................................. 37
7.1 Spare parts ................................................................................................................................. 37
7.2 Accessories................................................................................................................................. 37
7.3 Validation accessories ................................................................................................................ 37
7.4 Corresponding documentation.................................................................................................... 37
Section 8 Contact information............................................................................................................. 39
Section 9 Warranty and liabilityLimited warranty.............................................................................. 41
3
Table of Contents
Section 10 Certification ........................................................................................................................43
Appendix A Modbus Register ..............................................................................................................45
Index.......................................................................................................................................................47
4
Section 1 Specifications
These are subject to change without notice.
General Information
Measuring method
Ion-selective electrodes for nitrate and chloride, pHD reference electrode and
temperature sensor
Measuring range 0.1 to 1000 mg/L [NO3–N] and 0.1 to 1000 mg/L [Cl-]
Minimum detection limit 0.5 mg/L [NO
Precision 5% of the measured value + 0.2 mg/L
3
–N]
1
1
Reproducibility 5% of the measured value + 0.2 mg/L1
Response time (90%) < 3 min (5 to 50 mg/L NO
3
-N)
Measuring interval continuous
pH range pH 5 to pH 9
Calibration methods
Sensor code for sensor cartridge
1 and 2-point matrix correction
Power consumption 1W
Power supply via sc controller
Data transfer via sc controller
Ambient data
Typical environment Use in municipal waste water applications
Storage temperature
Sensor: –20 to 60 °C (–4 to 140 °F)
Sensor cartridge: 5 to 40 °C (41 to 104 °F)
Operating temperature Air: –20 to 45 °C (–4 to 113 °F)
Sample temperature +2 to 40 °C (35 to 104 °F)
Max. flow velocity < 4 m/s
Max. sensor immersion
depth/pressure
Max. air pressure for cleaning unit
option
Can be immersed 0.3 to 3.0 m [1 to 10 ft]
max. pressure: 0.3 bar (4.4 psi).
3.1 bar (45 psi)
General sensor information
Sensor dimensions 360.9 mm x 48.3 mm (14.21 x 1.9 in) (L x Ø), see Figure 1 on page 6.
Standard: 10 m (33.8 ft)
Sensor cable length
Optional extension cables available in
5, 10, 15, 20, 30, 50 m [16.4, 33.8, 49.2, 65.6, 98.4, 164 ft].
Total maximum length: 100 m (328 ft)
Sensor weight Approx. 1326 g (46.77 oz)
Wetted materials
Only for immersed installation: Sensor body made of stainless steel 316 with
ends made of Ryton PPS
®2
.
Installation angle 45° +/– 15° vertical in flow direction
1
with standard solutions for ISE electrodes in lab conditions
2
Ryton® is a registered trademark of Phillips 66 Co.
5
Specifications
1.1 Dimensions
Figure 1 Stainless steel sensor dimensions
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Section 2 General Information
2.1 Safety information
Please read this entire manual before unpacking, setting up, or
operating this equipment. Pay attention to all danger and caution
statements. Failure to do so could result in serious injury to the
operator or damage to the equipment.
To ensure that the protection provided by this equipment is not
impaired, do not use or install this equipment in any manner other
than that specified in this manual.
2.1.1 Use of hazard information
DANGER
Indicates a potentially or imminently hazardous situation
which, if not avoided, could result in death or serious injury.
CAUTION
Indicates a potentially hazardous situation that may result in
minor or moderate injury.
Important Note: Information that requires special emphasis.
2.1.2 Precautionary labels
This symbol, if noted on the instrument, references the user manual for operation and/or safety information.
Electrical equipment marked with this symbol may not be disposed of in European domestic or public disposal
systems after 12 August 2005. In conformity with European local and national regulations (EU Directive
2002/96/EC), European electrical equipment users must now return old or end-of life equipment to the manufacturer
for disposal at no charge to the user.
Note: For return for recycling, please contact the equipment manufacturer or supplier for instructions on how to
return end-of-life equipment, manufacturer-supplied electrical accessories, and all auxiliary items for proper disposal.
Note: Information that supplements points in the main text.
Read all labels and tags attached to the instrument. Personal injury
or damage to the instrument could occur if not observed. A symbol,
if noted on the instrument, will be included with a danger or caution
statement in the manual.
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General Information
2.2 General sensor information
The sensor was developed for use in municipal waste water
applications.
The NO3D sc sensor (see Figure 2) with ion-selective electrode (ISE
sensor) is a continuous online process sensor for the measurement of
nitrate directly in the tank. It operates without reagents and requires no
further processing of the sample. The nitrate ions are measured using
an ion-selective electrode.
The only wear part is the sensor cartridge (see Figure 3 on page 8)
(Catalog Number 6188401). This includes the ion-selective electrodes
for nitrate and chloride (compensation electrode), a pHD electrode
used as a reference system and a temperature sensor for temperature
compensation.
An optional cleaning unit is designed for automatically cleaning the
sensor head membranes and can be ordered separately. Refer to the
instruction sheet supplied with the cleaning unit.
The manufacturer recommends the use of the High Output Air Blast
system for the compressed air supply; this is a compressor in
weather-proof plastic housing
.
Figure 2 NO3D sc sensor
1 Sensor cartridge 3 Sensor adapter
2 Locking ring 4 Sensor housing
Figure 3 Sensor cartridge
1 Salt bridge 3 Temperature sensor
2 Membrane for chloride 4 Membrane for nitrate
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2.3 Theory of operation
General Information
The NO3D sc sensor utilizes ion-selective electrode technology to
measure nitrate ions (NO
interferences of temperature and chloride are compensated by
using appropriate built-in sensors. The reference electrode is a
differential pH technology and does not have direct contact with the
process and therefore, it is particularly stable against drift.
Ion-selective electrodes have a special membrane to which only a
specific type of ion can adhere. As a result an ion-specific potential
forms on the membrane surface. To be able to measure a potential
difference, a reference electrode is required, which is not affected
by the sample to be measured.
CARTRICAL
calibrating each electrode individually but also calibrating all
3 electrodes to each other.
TM
technology reduces cross-sensitivities by not only
-
) in a waste water sample. Well-known
3
9
General Information
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Section 3 Installation
3.1 Unpacking the sensor
Important Note: Only qualified personnel should conduct the tasks
described in this section of the manual.
Remove the sensor from the shipping container and inspect the
sensor for damage. Verify that all items listed in Figure 4 are
included. If any items are missing or damaged, contact the
manufacturer or distributor.
Figure 4 Items supplied
1 Sensor cable 4 Locking ring
2 NO3D sc sensor 5 Sensor cartridge (supplied in a storage container with
polishing paper for the chloride electrode)
3 Opaque gasket 6 Cleaning brush
3.2 Unpacking the sensor cartridge
Important Note: Avoid touching the membrane on the sensor
cartridge or damage to the sensor may occur.
1. Pay attention to the set in operation before date on the outside
of the sensor cartridge storage container and the certificate.
This is not the expiration date but the optimal date for putting
the cartridge into operation for maximum life of the sensor
cartridge.
2. Remove the cap of the storage container (see Figure 6 on
page 13).
3. Take the sensor cartridge out of the storage container and
remove the black gasket. This black gasket is not needed for
installation but is useful to create a seal for storage of the
sensor cartridge in the storage container.
Note: Make sure that the sensor cartridge is not exposed to air for
more than 30 minutes.
Important Note: Before fitting the sensor cartridge in the sensor
adapter, hold sensor cartridge in hand with membranes facing
straight down and shake gently in a downward motion two times to
remove air bubbles that may form underneath the membrane.
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Installation
4. Connect the sensor cartridge to the sensor (see 3.3 Sensor
assembly on page 13).
Important Note: The sensor cartridge only fits correctly in the
sensor adapter in one position. Pay attention to the markings on the
sensor cartridge and on the sensor adapter
(see Figure 8 on page 14).
Figure 5 Storage container packaging
1 Polishing paper for the chloride electrode 3 Serial number
2 Part number 4 Opaque gasket
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Installation
Figure 6 Storage container for sensor cartridge
1 Storage container 3 Sensor cartridge
2 Black gasket (remove before installation) 4 Cap
1
Save items 1, 2 and 4 for sensor storage.
3.3 Sensor assembly
Important Note: Avoid touching the membranes on the sensor
cartridge or damage to the sensor may occur.
1. Remove the black gasket.
2. Ensure that the opaque gasket is in place in the sensor
adapter. The opaque gasket will be between the sensor and the
sensor cartridge. A spare opaque gasket is inside the box that
contains the sensor cartridge. Replace the opaque gasket
every time the sensor cartridge is replaced.
Important Note: Without the opaque gasket, damage of the sensor
will occur.
3. Align the markings on the sensor cartridge with the sensor
adapter (see Figure 8 on page 14) and connect the sensor
cartridge into the sensor adapter.
1
4. Attach the locking ring over the sensor head and hand-tighten.
Note: Use the cap of the storage container as a tool/screwing aid for
the locking ring (Figure 9 on page 15).
Note: Do not leave sensor cartridge out of water for more than 30 minutes
(Figure 7 on page 14).
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Installation
Figure 7 Sensor cartridge
1 Make sure that this end remains wet 2 Make sure that the contacts on this end stay dry
Figure 8 Sensor assembly
1 Locking ring 4 Sensor adapter
2 Sensor cartridge 5 Sensor housing
3 Alignment arrows 6 Opaque gasket
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Figure 9 Cap of the storage container as a tool/screwing aid for the locking ring
1 Cap 2 Locking ring
3.4 Installation of the cleaning unit (optional)
Installation
To install the cleaning unit on the sensor, refer to the installation
instructions for the cleaning unit (section 7.4 on page 37).
The cleaning interval can be set using the relay control of the sc
controller. Select RTC (Real Time Clock) as the signal source.
3.5 Installation of the sensor in the sample flow
Installation kits are available for the installation of the sensor with or
without a cleaning unit for a wide range of requirements.
The following rules must always be considered prior to installation:
• Install the sensor where the sample that comes into contact
with the sensor is representative of the entire process.
• Position the sensor at least 200 mm (7.87 in.) from the tank
wall.
• When using a chain bracket, ensure that the sensor cannot hit
the tank wall when it moves.
• Immerse the sensor at an angle of approx. 45° ± 15° in the
direction of the flow so that air bubbles cannot remain
underneath the membranes.
• Ensure that the sensor is fully immersed.
• When using the cleaning unit refer to the supplied Instruction
Sheet.
• Refer to the instructions supplied with the optional mounting
accessories for detailed installation information (see Figure 10
on page 16).
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