Hach NO3D sc User manual

DOC023.53.90140
NO3D sc Nitrate Sensor
USER MANUAL
12/2008, Edition 1A
© HACH Company, 2008. All rights reserved. Printed in Germany

2

3
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

4
Table of Contents
Section 10 Certification ........................................................................................................................43
Appendix A Modbus Register ..............................................................................................................45
Index.......................................................................................................................................................47

5
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 [NO3–N]1
Precision 5% of the measured value + 0.2 mg/L1
Reproducibility 5% of the measured value + 0.2 mg/L1
Response time (90%) < 3 min (5 to 50 mg/L NO3-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
Can be immersed 0.3 to 3.0 m [1 to 10 ft]
max. pressure: 0.3 bar (4.4 psi).
Max. air pressure for cleaning unit
option 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.
Sensor cable length
Standard: 10 m (33.8 ft)
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.

6
Specifications
1.1 Dimensions
Figure 1 Stainless steel sensor dimensions

7
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.
Note: Information that supplements points in the main text.
2.1.2 Precautionary labels
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.
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.

8
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
1Sensor cartridge 3Sensor adapter
2Locking ring 4Sensor housing
Figure 3 Sensor cartridge
1Salt bridge 3Temperature sensor
2Membrane for chloride 4Membrane for nitrate

9
General Information
2.3 Theory of operation
The NO3D sc sensor utilizes ion-selective electrode technology to
measure nitrate ions (NO3-) in a waste water sample. Well-known
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.
CARTRICALTM technology reduces cross-sensitivities by not only
calibrating each electrode individually but also calibrating all
3 electrodes to each other.

10
General Information

11
Section 3 Installation
Important Note: Only qualified personnel should conduct the tasks
described in this section of the manual.
3.1 Unpacking the sensor
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.
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.
Figure 4 Items supplied
1Sensor cable 4Locking ring
2NO3D sc sensor 5Sensor cartridge (supplied in a storage container with
polishing paper for the chloride electrode)
3Opaque gasket 6Cleaning brush

12
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
1Polishing paper for the chloride electrode 3Serial number
2Part number 4Opaque gasket

13
Installation
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.
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).
Figure 6 Storage container for sensor cartridge1
1Storage container 3Sensor cartridge
2Black gasket (remove before installation) 4Cap
1 Save items 1, 2 and 4 for sensor storage.

14
Installation
Figure 7 Sensor cartridge
1Make sure that this end remains wet 2Make sure that the contacts on this end stay dry
Figure 8 Sensor assembly
1Locking ring 4Sensor adapter
2Sensor cartridge 5Sensor housing
3Alignment arrows 6Opaque gasket

15
Installation
3.4 Installation of the cleaning unit (optional)
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).
Figure 9 Cap of the storage container as a tool/screwing aid for the locking ring
1Cap 2Locking ring

16
Installation
Figure 10 Example of sensor installation with Rail Mount Kit

17
Installation
3.6 Connect the sensor to the sc controller (non-hazardous location) with
quick-connect fittings
The sensor cable is supplied with a keyed quick-connect fitting for
easy attachment to the controller (see Figure 11 on page 17).
Retain the connector cap to seal the connector opening in case the
sensor must be removed. Optional extension cables may be
purchased to extend the sensor cable length.
1. Unscrew the protective cap from the socket on the controller.
2. Insert the connector in the socket and hand-tighten the union
nut.
Note: When using an sc1000 controller, do not use the middle connection
for the sensors as this is reserved for the display module.
Figure 11 Connect the sensor using quick-connect fitting on the sc controller

18
Installation

19
Section 4 Operation
4.1 Using an sc controller
Before using the sensor in combination with an sc controller, refer
to the controller user manual for navigation information.
4.2 Sensor setup
When a sensor is installed for the first time, the serial number of the
sensor is displayed as the sensor name. The sensor name can be
changed as follows:
1. Select MAIN MENU.
2. From the Main Menu, select SENSOR SETUP and confirm.
3. Select the appropriate sensor if more than one sensor is
attached and confirm.
4. Select CONFIGURE and confirm.
5. Select EDIT NAME and edit the name. Confirm or cancel to
return to the Sensor Setup menu.
4.3 Sensor data logging
The sc controller provides a data log and an event log for each
sensor. The data log contains the measured data at selected
intervals. The event log contains a large number of events that
occur on the instruments, such as configuration changes, alarms
and warnings, etc. The data log and the event log can be exported
to CSV format. For information on downloading the logs, refer to the
sc controller user manual.
4.4 Sensor diagnostics menu
SELECT SENSOR
ERROR LIST Displays all actual error codes.
WARNING LIST Displays all actual warnings.

20
Operation
4.5 Sensor setup menu
SELECT SENSOR (if there is more than one sensor)
CALIBRATE
CAL.CONFIG.
Note: If once a calibration method is chosen the entries will be displayed in the first
submenu of the calibrate menu.
Select SENSOR CODE, MATX1, MATX1 CL-, MATX2, MATX2 CL-, VALUE CORR,
PREVIOUS CAL or FACTORY CAL
-or-
CAL.CONFIG.>SENSOR CODE
DATE Displays the date of sensor cartridge start up
SENSOR CODE Display and entry of the sensor code
-or-
CAL.CONFIG.>MATX1 1 point matrix correction (see section 4.6.3.1 on page 24)
DATE Displays the date of the current correction
CONC MEAS 1 Saving the currently measured measurement
SET NO3–N CONC Entry and display of the NO3–N reference value (lab value)
-or-
CAL.CONFIG.>MATX1 CL- 1 point matrix correction with chloride (see section 4.6.3.2 on page 24)
DATE Displays the date of the current correction
CONC MEAS 1 Saving the currently measured measurement
SET CL- CONC Entry and display of the Cl-reference value (lab value)
SET NO3–N CONC Entry and display of the NO3–N reference value (lab value)
-or-
CAL.CONFIG.>MATX2 2 point matrix correction (see section 4.6.3.3 on page 25)
CONC MEAS 1 Saving the currently measured measurement
DATE Displays the date of the current correction
SET NO3–N CONC Entry and display of the NO3–N reference value (lab value)
CONC MEAS 2 Saving the second measured measurement
DATE Displays the date of the current correction
SET NO3–N CONC Entry and display of the NO3–N reference value (lab value)
-or-
CAL.CONFIG.>MATX2 CL- 2 point matrix correction with chloride (see section 4.6.3.4 on page 26)
Note: Carry out the matrix correction only as a standard addition in the sample matrix.
CONC MEAS 1 Saving the currently measured measurement
DATE Displays the date of the current correction
SET CL- CONC Entry and display of the Cl-reference value (lab value)
SET NO3–N CONC Entry and display of the NO3–N reference value (lab value)
CONC MEAS 2 Saving the second measured measurement
DATE Displays the date of the current correction
SET CL- CONC Entry and display of the Cl-reference value (lab value)
SET NO3–N CONC Entry and display of the NO3–N reference value (lab value)