Hach NITRATAX plus sc, NITRATAX clear sc, NITRATAX eco sc User Manual

DOC023.52.03211

NITRATAX sc

USER MANUAL

11/2014, Edition 6A

© HACH Company, 2007–2012, 2014 All rights reserved. Printed in Germany. sd/sk

1

Table of Contents

Section 1 Specifications.................................................................................................................... 3

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 Product overview ......................................................................................................................... 8

2.3 Theory of operation...................................................................................................................... 9

Section 3 Installation........................................................................................................................ 11

3.1 Installation overview................................................................................................................... 11

3.2 Unpack the sensor..................................................................................................................... 12

3.3 Wiring safety information ........................................................................................................... 12

3.3.1 Sensor connection and wiring........................................................................................... 12

Section 4 System Start Up..............................................................................................................15

4.1 Power the instrument................................................................................................................. 15

Section 5 Operation.......................................................................................................................... 17

5.1 Use of an sc controller ............................................................................................................... 17

5.2 Sensor setup.............................................................................................................................. 17

5.3 Sensor data logging................................................................................................................... 17

5.4 Sensor diagnostics menu........................................................................................................... 18

5.5 Sensor setup menu.................................................................................................................... 18

5.6 Sensor calibration ...................................................................................................................... 20

5.6.1 Adjusting turbidity compensation ...................................................................................... 22

Section 6 Maintenance .................................................................................................................... 23

6.1 Maintenance schedule............................................................................................................... 23

6.2 Clean the measuring path.......................................................................................................... 24

6.3 Change the wiper profile............................................................................................................ 25

6.4 Check the calibration ................................................................................................................. 26

Section 7 Troubleshooting ............................................................................................................. 29

7.1 Error messages.......................................................................................................................... 29

7.2 Warnings.................................................................................................................................... 29

Section 8 Replacement Parts and Accessories......................................................................... 31

Section 9 Contact Information....................................................................................................... 33

Section 10 Warranty and liability .................................................................................................. 35

Index...................................................................................................................................................... 39

2

Table of Contents

3

Section 1 Specifications

Specifications are subject to change without notice.

Component NITRATAX plus sc NITRATAX eco sc NITRATAX clear sc

NITRATAX sc tank sensor

Measuring technique UV absorption measurement, reagent-free

Measuring method Patented 2-beam method

Measuring path

1 mm (0.04 in.), 2 mm
(0.08 in.), 5 mm (0.20 in.)

1 mm (0.04 in.) 5 mm (0.20 in.)

Measuring range with
NO

3

-N standard solutions

0.1-100.0 mg/L NO

2+3

–N

(1 mm/0.04 in.)

0.1–50.0 mg/L NO

2+3

–N

(2 mm/0.08 in.)

0.1–25.0 mg/L NO

2+3

–N

(5 mm/0.20 in.)

1.0–20.0 mg/L NO

2+3

–N 0.5–20.0 mg/L NO

2+3

–N

Lower detection limit
(mg/L) NO

3

-N

0.1 (5 mm/0.20 in.) 1 0.5

Upper detection limit
(mg/L) NO

3

-N

100 (1 mm/0.04 in.) 20 20

Measuring error (mg/L)
NO

3

-N

±3 % of the mean MW ±0.5 ±5 % of the mean MW ±1.0

±5 % of the mean
MW ±0.5

Resolution (mg/L) 0.1 0.5 0.1

Sludge compensation yes yes —

Measuring interval (>= min) 155

T100 response time (min) 1155

Integration >1 min, adjustable 15–30 min, adjustable >5 min, adjustable

Power consumption 2 W

Cable length 10 m (30 ft)

Sensor pressure limit maximum 0.5 bar (7 psi)

Ambient temperature 2 to 40 °C (36 to 100 °F)

Dimensions D x L
(Figure 1 on page 5)

approximately
70 x 229–333 mm
(3 x 13.1 in.)

approximately
75 x 323 mm
(3 x 12.9 in.)

approximately
75 x 327 mm
(3 x 12.7 in.)

Weight approximately 3.6 kg (7.9 lb) approximately 3.3 kg (7.3 lb) approximately 3.3 kg (7.3 lb)

NITRATAX sc sensors flow through units

Sample flow rate 0.5–10 L/h sample — 0.5–10 L/h sample

Sample connection Tube ID 4 mm/AD 6 mm — Tube ID 4 mm/AD 6 mm

Sample temperature 2 to 40 °C (36 to 100 °F) — 2 to 40 °C (36 to 100 °F)

Dimensions

W x H x D approximately
500 x 210 x 160 mm
(20 x 8.3 x 6.3 in.)

—

W x H x D approximately
500 x 210 x 160 mm
(20 x 8.3 x 6.3 in.)

Weight (without sensor) approximately 3.6 kg (7.9 lb) — approximately 3.6 kg (7.9 lb)

4

Specifications

NITRATAX sc sensor material

Sensor

Sensor enclosure Stainless steel 1.4571 Stainless steel 1.4581

Wiper axle Stainless steel 1.4104 Stainless steel 1.4571

Cable gland Stainless steel 1.4305

Profile carrier 1 mm/2 mm Stainless steel 1.4310

Wiper arm 5 mm Stainless steel 1.4581

Wiper profile Silicone

Measuring windows SUPRASIL (quartz glass)

Enclosure seals Silicone

Seal, cable gland PVDF

Sensor cable

PUR

10 m (33 ft) standard

Optional extension cables available in 5, 10, 15, 20, 30, 50 m

Total maximum length: 60 m (196 ft)

Struts

Adaptor for filtration
sensor

Stainless steel 1.4308

Struts Stainless steel 1.4301

Flow through cell (bypass)

Measuring cell PVC

Seals EPDM

Glands PVDF

Sample tube PVC

Component NITRATAX plus sc NITRATAX eco sc NITRATAX clear sc

5

Specifications

Figure 1 Sensor dimensions

1 NITRATAX plus sc 4 Wiper profile 1 and 2 mm (0.04 in. and 0.08 in.)
2 NITRATAX clear sc 5 Wiper profile 5 mm (0.20 in.)
3 NITRATAX eco sc

6

Specifications

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.

Make sure 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

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.

DANGER

Indicates a potentially or imminently hazardous situation which, if not avoided, will result in death
or serious injury.

WARNING

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.

NOTICE

Indicates a situation which, if not avoided, may cause damage to the instrument. Information that
requires special emphasis.

This symbol, if noted on the instrument, references the instruction manual for operation and/or safety information.

Electrical equipment marked with this symbol may not be disposed of in European public disposal systems after
12 August of 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 Producer for disposal at no
charge to the user.

Note: For return for recycling, please contact the equipment producer or supplier for instructions on how to return
end-of-life equipment, producer-supplied electrical accessories, and all auxiliary items for proper disposal.

This symbol, when noted on a product enclosure or barrier, indicates that a risk of electrical shock and/or
electrocution exists.

This symbol, if noted on the product, indicates the need for protective eye wear.

This symbol, when noted on the product, identifies the location of the connection for Protective Earth (ground).

This symbol, when noted on the product, identifies the location of a fuse or current limiting device.

8

General Information

2.2 Product overview

The NITRATAX plus sc sensor (Figure 2, item 1) measures the nitrate concentration up to
100 mg/L N directly immersed in the medium. Use the sensor without the need for
pumping and conditioning in activated sludge tanks in municipal sewage treatment plants,
surface water, untreated water and treated drinking water. The system can also be used
for checking the outlet on waste water treatment plants.

The NITRATAX eco sc (Figure 2, item 2) measures the nitrate concentration up to
20 mg/L N directly immersed in the medium. Use the sensor without the need for pumping
and conditioning in activated sludge tanks in municipal sewage treatment plants.

The NITRATAX clear sc (Figure 2, item 3) measures the nitrate concentration up to
20 mg/L N directly immersed in the medium. Use the sensor without the need for pumping
and conditioning in clear media such as surface water, treated drinking water and sewage
treatment plant outlets.

Note: The flow-through units of the high precision NITRATAX plus sc and the NITRATAX clear sc
sensors are used wherever direct measurement in the medium is not possible for structural reasons,
or the medium load makes it necessary to measure a filtered sample (very high TS content, sewage
treatment plant inlet, waste dump leachate, etc.).

Figure 2 NITRATAX sc sensor versions

1 NITRATAX sc plus 2 NITRATAX sc eco 3 NITRATAX sc clear

9

General Information

2.3 Theory of operation

Nitrate dissolved in water absorbs UV light with wavelengths below 250 nm. This inherent
absorption by nitrate makes it possible to photometrically determine the nitrate
concentration without reagents by using a sensor positioned directly in the medium. As the
measuring principle (Figure 3) is based on the evaluation of (invisible) UV light, the color
of the medium has no effect.

The sensor contains a two-beam absorption photometer with turbidity compensation. The
measuring window is mechanically cleaned using a wiper.

The measuring and cleaning intervals can be entered using the related controller. The
measured value is displayed as NO

x

-nitrogen in mg/L NOx–N (NO2–N is included in the
measured result as nitrite nitrogen) and provided on current outputs. Various operating
modes for the outputs permit local regulation without further process data processing.

Figure 3 Measurement principle of the NITRATAX sc

1 Receiver, Reference Element 3 UV Lamp 5 Mirror
2 Two-sided Wiper 4 Measurement Slit 6 Receiver, Measuring Element

10

General Information

11

Section 3 Installation

3.1 Installation overview

Figure 4 shows an example of a NITRATAX sc sensor attached to an sc controller with a

bracket installation option.

CAUTION

Installation of this system may only be carried out by qualified experts in accordance with all local
safety regulations.See the mounting instruction sheet for more information.

Figure 4 Installation example with optional accessories

1 sc controller with optional sun roof 4 Minimum distance of 100 mm (3.94 in.) to the ground
2 Sensor bracket 5 NITRATAX plus sc: 468–472 mm (18.4–19.6 in.)

NITRATAX eco sc: 466 mm (18.3 in.)
NITRATAX clear sc: 462 mm (18.1 in.)

3 NITRATAX sc sensor

12

Installation

3.2 Unpack the sensor

Remove the sensor from the shipping container and inspect the sensor for damage.
Verify that all items listed in Figure 5 are included. If any items are missing or damaged,
contact the manufacturer or distributor.

3.3 Wiring safety information

3.3.1 Sensor connection and wiring

The sensor can be connected to any sc controller using the supplied keyed quick-connect
fitting. The sensor can also be hard-wired to an sc 100 or sc 1000 controller (Refer to

Figure 7 for more information).

To attach the sensor to the controller with the quick-connect fitting:

1. Unscrew the protective cap on the socket on the controller (Figure 6). Retain the
protective cap to seal the connector opening in case the sensor must be removed.

Figure 5 Items supplied

1 NITRATAX sc sensor with cable 3 1 wiper set (5 pieces) for 1 or 2 mm (0.04 in. and

0.08 in.) sensors

2 Nitrate standard solution (1 L) 4 1 wiper set (5 pieces) for 5 mm (0.20 in.) sensors

WARNING

Electrical shock hazard. Always disconnect power to the instrument when making any electrical
connections.

CAUTION

Before power is applied, refer to the controller operation instructions.

13

Installation

2. Insert the connector in the socket and hand-tighten the union nut.

Note: The middle connection of a sc1000 controller is solely reserved for the display module.
Note: Optional cables may be purchased to extend the sensor cable length (see Section 8 on

page 31).

Figure 6 Attach the sensor to the controller with the quick-connect fitting

Figure 7 Sensor connector pin assignment

Terminal number Terminal description Wire color code

1+12 VDCbrown
2 Mass/Circuit common black
3Data (+)blue
4 Data (–) white
5 Screen/Shield Screen/Shield (grey)
6 Notch —

1

2

3

4

5

6

14

Installation

15

Section 4 System Start Up

4.1 Power the instrument

1. Plug the sensor into the controller.

2. Supply power to the controller.

3. When the controller is switched on for the first time, a menu for selecting the

language opens automatically. Select the required language.

4. Following language selection and upon subsequent power-up, the controller will
search for connected sensors. The display will show the main measurement screen.
Press the MENU key to access the menus.

16

System Start Up

17

Section 5 Operation

5.1 Use of an sc controller

Before using the sensor in combination with an sc controller, refer to the controller user
manual for navigation information.

5.2 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 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 CONFIGURATION and confirm.

5. Select EDIT NAME and edit the name. Confirm or cancel to return to the

Configuration menu.

Use the following commands to complete the sensor configuration, see section 5.5 on

page 18.

• PARAMETER

• MEAS UNIT

• MEAS INTERVAL

• RESPONSE TIME

• CLEANING

• WIPER MODE

• BYPASS

• TEST/MAINT

• SET DEFAULTS

5.3 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. The logs
can be downloaded through the digital network port, service port, or the IrDA port.
DataCom is needed for downloading logs to a computer. For information on downloading
the logs, refer to the sc controller user manual.

The data logger of the sc100 contains the last 7000 values of the NITRATAX sc sensor.
The data logger of the sc1000 can log more than 7000 values. The log intervall is the
same like the measuring intervall of the NITRATAX sc sensor.

18

5.4 Sensor diagnostics menu

SELECT SENSOR STATUS>SELECT SENSOR (if more than one sensor is attached)

ERROR LIST

Displays all actual error messages:
MOIST, R < M, DEXT < 0.0, W. POS. UNKNOWN, W. BLOCKED, FLASH FAILURE, R TOO
HIGH, REPLACE SHAFT SEAL, SENSOR MISSING

WARNING LIST

Displays all actual error messages:
EM TOO HIGH, CONC. TOO HIGH, CHECK CALIBR., REPLACE PROFILE, SERVICE
REQUIRED, REPLACE SEALS, SHAFTSEALS REPL.

Note: For more information about error messages and warnings refer to Section 7 on page 29.

5.5 Sensor setup menu

SELECT SENSOR (if more than one sensor is attached)

CALIBRATE (see 5.6 on page 20)

FACTOR

Correction factor for the measured value.
Possible settings: 0.80–1.20
Default: FACTOR = 1

OFFSET

Adjustable from –250 to +250 mE for zero point correction

Default: OFFSET = 0
OFFSET ADJUST Perform a zero point calibration
1 SAMPLE CAL Perform a single point calibration

CAL CONFIG

Select OUTPUT MODE or CAL INTERVAL

OUTPUT MODE: Select the behavior of the outputs during calibration for zero point setting

(Hold, Active, Transfer, Choice). Hold maintains the last reading prior to going into the menu.

Active transmits the current level readings, corrected with previous calibration data until new

data is entered. Set Transfer transmits the value designated during the system setup

CAL INTERVAL: Enter number of days
SET CAL DEFLT The instrument resets the settings to the default configuration.

CONFIGURATION

EDIT NAME Can be edited as required (up to 10 characters)
PARAMETER NOx-N or NO3 (eco only NOx-N)

MEAS UNIT

Unit for the measured result.

Possible settings: mg/l, ppm

MEAS INTERVAL

eco/clear: 5, 6, 10, 12, 15, 20, 30 min

plus: 15, 20, 30 sec; 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30 min

Note: Intervall of the data log is the same like the measuring intervall.

RESPONSE TIME

Indication of the actual response time in Counts (count x measuring interval = response time)

eco: 3–6 x MEAS INTERVAL

clear: 1–6 x MEAS INTERVAL

plus: 1–12 x MEAS INTERVAL

Note: Gliding average over 2-12 measurements.

CLEANING

eco, clear: 1/MEASURE

plus: 1/MEASURE; 1,2,3,5,6,10,12,15,20,30 min; 1,2,3,4,6,12 h, 10:00 h

WIPER MODE

Wiping interval.

Select SINGLE or DOUBLE A-B-A or DOUBLE B-A-B

SINGLE: Default setting (Default: eco)

DOUBLE A-B-A: Double wiping frequency

DOUBLE B-A-B: Double wiping frequency (Default: plus, clear)

BYPASS

YES/NO (plus and clear)

YES: Setting for bypass application (inhibits wiper "extension")

19

Operation

TEST/MAINT

Counter for customer service settings: 0–1000 days (180 days are recommended)

Check the service contract and enter the defined value (number of days).

0 = Service deactivated

SET DEFAULTS

The instrument resets the settings to the default configuration.

PARAMETER: eco: NOx-N; plus, clear: NO

3

MEAS UNIT: mg/l

MEAS INTERVAL: 5 min

RESPONSE TIME: eco, plus: 3 Counts; clear: 1 Count

WIPER MODE: eco: SINGLE ; plus, clear: B-A-B, B-A-B

TEST/MAINT

PROBE INFO

Select NITRATAXplus/eco/clear, LOCATION, SERIAL NUMBER, RANGE, PATH LENGTH,

WIPER P/N, MODEL NUMBER,SOFTWARE VERS, DRIVER VERS., PRODUCTION DATE

Name of connected sensor: NITRATAX plus/eco/clear

LOCATION

SERIAL NUMBER: serial number of connected sensor

RANGE: Measuring range corresponding to the measuring path

PATH LENGTH: Width of the measuring path

WIPER P/N: Item number

MODEL NUMBER: Item number

SOFTWARE VERS: Sensor software

DRIVER VERS.: STRUCTURE, FIRMWARE, CONTENT

PRODUCTION DATE: Production date

CAL DATA

Overview of OFFSET, FACTOR, DATE, DEXT 100%, DEXT 50%, DEXT 25%, CAL, R , M, IR

and IM

OFFSET: Adjustable on the CALIBRATION menu

FACTOR: Adjustable on the CALIBRATION menu

DATE: Date of the last change of OFFSET and/or FACTOR

Internal calibration data:

DEXT 100%

DEXT 50%

DEXT 25%

CAL.: Internal calibration data

R: Internal calibration data

M: Internal calibration data

IR: Internal calibration data

IM: Internal calibration data

5.5 Sensor setup menu (continued)

20

Operation

5.6 Sensor calibration

1. Select 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 CALIBRATE and confirm.

COUNTERS

Overview of TOTAL TIME, PROFILE, CAL CHECK, SERVICE, SEALS, SHAFTSEAL, MOTOR
and FLASH

TOTAL TIME: Counter
PROFILE: Counter 50000–0-negative number

Note: Negative if passed. Negative numbers create warning messages.

CAL CHECK: Counter xdays–0 - negative number

Note: Negative if passed. Negative numbers create warning messages.

SERVICE: Counter 180 days–0-negative number

Note: Negative if passed. Negative numbers create warning messages.

SEALS: Counter 365 days–0-negative number

Note: Negative if passed. Negative numbers create warning messages.

SHAFTSEAL: Counter 500000–0-negative number

Note: Negative if passed. Negative numbers create warning messages.

MOTOR: Counter
FLASH: Counter

MAINT. PROC.

Select REPLACE PROFILE, SERVICE DONE, WIPERTEST, SIGNALS or OUTPUT MODE
REPLACE PROFILE: see 6.3 on page 25
SERVICE DONE: ARE YOU SURE? Confirm or press BACK key

Confirm: The instrument resets the settings after a prompt confirmation to the default
configuration.

Press BACK key to return to the MAINT. PROC. menu.
WIPERTEST: Select WIPE or DRIVE OUT WIPER or MOTOR CURRENT.

WIPE: Wiping process
DRIVE OUT WIPER: Wiper profile extends, on flow-through versions inhibited (see 6.2 on page

24)

MOTOR CURRENT: Measurement during the wiping process (motor current < 100 mA)
SIGNALS: ENTER = WIPE: Confirm.

Average value: target: < 100 mA
Individual measured value = displayed value
Single measured value for AQA (FACTOR = 1, OFFSET = 0)
W.POS (wiper position)
DEXT (delta extinction between EM and ER)
EM (extinction measuring channel)
ER (extinction reference channel)
M (measured level)
R (reference level)
IM (intensity measuring channel)
IR (intensity reference channel)
MOIST

OUTPUT MODE: Select ACTIVE or HOLD or TRANSFER or CHOICE

5.5 Sensor setup menu (continued)

21

Operation

5. Close the hole of the back of the measuring path of 2 and 5 mm sensors with a sticky

tape that filled water cannot flow out.

6. Select OFFSET ADJUST and confirm.

7. Confirm the displayed OUTPUT MODE information.

8. FILL IN AQUA DEST PRESS ENTER TO CONTINUE is displayed. Remove the

sensor from the tank and the rinse measuring path with distilled water. Align the
measuring path horizontally and completely fill with distilled water. Confirm.

9. PRESS ENTER WHEN STABLE, CONC. X.X mg/l NO3, DEXT X.X mE is displayed.
Confirm when a stable value is reached.

10. Select WIPE. Wiping process occurs.

11. PRESS ENTER WHEN STABLE , CONC. X.X mg/l NO3, DEXT X.X mE is displayed.

Add distilled water until the measured value is stable and confirm.

12. Select CALIBRATE and confirm.

13. COMPLETE OFFSET X.X mE is displayed. Confirm.

14. PRESS ENTER WHEN STABLE, CONC. X.X mg/l NO3, DEXT X.X mE is displayed.

Confirm when a stable value is reached.

15. Select COMPLETE and confirm.

16. Select 1 SAMPLE CAL and confirm.

17. FILL IN STANDARD PRESS ENTER TO CONTINUE is displayed.

Select Option 1 or Option 2:

• Option 1: Insert the verification filter now to calibrate.

• Option 2: Adjust the sensor calibration using a standard solution

(or a

user-specific measuring solution) and laboratory spectrophotometer.

Confirm.

18. PRESS ENTER WHEN STABLE, CONC. X.X mg/l NO3, DEXT X.X mE is displayed.
Note the mE value if working with the sample and confirm.

19. Select CALIBRATE. Adjust the XX.X mE value of the filter or sample from the
previously noted value and confirm.

20. Confirm COMPLETE FACTOR and the factor will be adjusted automatically.

21. PRESS ENTER WHEN STABLE, X.X mg/l NO3, X.X mE is displayed.

• Option 1: Completed after confirming. If this message is not displayed and

Option 1 was chosen, clean the lens and repeat.

• Option 2: Continue with the following steps.

22. Select WIPE and confirm.

23. PRESS ENTER WHEN STABLE, X.X mg/l NO3, X.X mE is displayed.

24. Check the values. Confirm when the mE value is close to noted previous one.

Option 2 is now completed.

25. Select COMPLETE and confirm.

Note: Only NITRATAXeco has a one point calibration which influences the offset.

26. The sensor calibration is completed.

22

Operation

5.6.1 Adjusting turbidity compensation

1. Take a sample of activated sludge at the measuring location after the first half of the

aeration phase. Immediately after sampling approximately 100 mL, filter the sample
using a folded filter.

2. Similar to a standard solution, pour the filtrate into the measuring path of the sensor.
As an alternative, the measured value can also be determined by a laboratory
measurement (for NO

2

–N and NO3–N).

3. Select 1 SAMPLE CAL and measure the filtered sample.

4. Turn the wiper on and add sample until the measured value is stable.

5. Immerse the sensor in the activated sludge tank.

6. Start the wiper several times until a stable result is obtained for the activated sludge.

Add the difference mE

filtered

–mE

aeration

to the adjusted offset value.

23

Section 6 Maintenance

Proper maintenance of the measuring windows in the sensor is critical for accurate
measurements. The measuring windows should be checked monthly for soiling and the
wiper profile checked for wear.

6.1 Maintenance schedule

CAUTION

Pinch Hazard. Only qualified personnel should conduct the tasks described in this section of the
manual.

NOTICE

The seals must be replaced by the manufacturer’s Service Department. For more information,
see the instruction sheet of the flow-through accessories for NITRATAX sc.

Maintenance Task weekly 6 months Annually as per counter

Visual inspection X

Check calibration

X

(depending on the

ambient conditions)
Inspection X (counter)
Seal change X (counter)
Wiper profile change X

Wearing parts

Quantity Description Average service life

1

1

Under normal operating conditions using factory settings.

1 Wiper sets 1 year
1 Wiper motor 5 years
1 Seal set 1 year
1 Light bulb 10 years
2 Measuring window 5 years
1 Filter set 5 years
2 O-ring flow unit 1 year

24

Maintenance

6.2 Clean the measuring path

Normal operation of this device may require the use of chemicals or samples that are
biologically unsafe.

• Observe all cautionary information printed on the original solution containers and
safety data sheets prior to their use.

• Dispose of all consumed solutions in accordance with the local and national
regulations and laws.

• Select the type of protective equipment suitable to the concentration and quantity of
the dangerous material being used.

Additional cleaning of the measuring path is not necessary if the wiper interval is set for
the appropriate application and the wiper profile is replaced regularly.

To clean the measuring path:

1. Select 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 TEST/MAINT and confirm.

5. Select MAINT.PROC. and confirm.

6. Confirm the displayed OUTPUT MODE information.

7. Select SIGNALS and confirm.

8. Confirm ENTER = WIPE.

9. Remove sensor from the tank. Depending on the degree and nature of the soiling,

clean measuring path using window cleaner, grease remover or 5 % hydrochloric
acid (the operation of the wiper arm using [WIPERTEST], [WIPE] can assist the
cleaning process).

10. Soak for 5–10 minutes, then carefully clean the measuring path with distilled water.
Objective: [ER] and [EM] < 500

11. Press BACK to return to MAINT.PROC.

12. Press BACK again. Confirm RETURN PROBE TO PROCESS (Measuring operation

after automatic wiping).

13. The cleaning of the measuring path is completed.

DANGER

Potential danger with contact with chemical/biological substances.
Working with chemical samples, standards and reagents can be dangerous.
Make yourself familiar with the necessary safety procedures and the correct handling of the

chemicals before use and read and follow all relevant safety data sheets.

25

Maintenance

6.3 Change the wiper profile

Refer to Figure 8 and the following steps to change the wiper profile.

Note: First remove the sensor out of the flow-through unit until the wiper can be extended without
resistance.

For this purpose on the menu set SENSOR SETUP>CONFIGURATION>BYPASS to
"NO". For more information about the flow-through unit refer to the instruction sheet of the
flow-through accessories for NITRATAX sc.

1. Select 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 TEST/MAINT and confirm.

5. Select MAINT.PROC. and confirm.

6. Remove the sensor out of the basin.

Note: For disassembly the sensor from the flow-through unit, refer to the instruction sheet of the
flow-through accessories for NITRATAX sc.

7. Confirm the displayed OUTPUT MODE information.

8. Select REPLACE PROFILE and confirm.

9. Lift the retaining strap (Figure 8, item 1), move the cap bottom up and remove it

(Figure 8, item 2 and 3).

10. Confirm REMOVE CAP!

Note: Only on instrument versions with 1 or 2 mm measuring path.

11. The wiper extends automatically. Exchange the wiper profile (Figure 8, item 4) and
replace the cap to lock in place (Figure 8, item 5).

12. Confirm REPLACE PROFILE! PUT ON CAP!

Note: Only on instrument versions with 1 or 2 mm measuring path.

13. Press BACK.

14. Remove the sensor back to the tank or install it in the flow-through unit. If necessary

adjust "YES" for the flow-through unit in the configuration menu.

15. Confirm RETURN PROBE TO PROCESS (Measuring operation after automatic
wiping).

16. The exchange of the wiper profile is completed.

CAUTION

Obey the locally applicable accident prevention regulations. Wear protective gloves where
necessary during the change of the wiper rubber.

26

Maintenance

6.4 Check the calibration

The NITRATAX sc program supports comparative measurements as part of Analytical
Quality Assurance (AQA) using a command that automatically sets the factor to "1" and
the offset to "0" so that standard solutions can be measured directly without further
adjustments.

1. Select 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 TEST/MAINT and confirm.

5. Select MAINT.PROC. and confirm.

6. Confirm the displayed OUTPUT MODE information.

7. Select SIGNALS and confirm.

8. Confirm ENTER = WIPE.

9. Tank version: Remove sensor from the tank, rinse the measuring path with water

and fill it with standard solution (pipette), see Figure 9 on page 27.
Flow-through version: Interrupt sample feed and supply with standard solution
(syring).

Observe the individual measured values on the display (3

rd

numerical value from the
top). The measurements are made automatically at an interval of 1 second. Then
re-install the sensor or connect sample feed.

10. Press BACK to return to MAINT.PROC.

11. Press BACK again. Confirm RETURN PROBE TO PROCESS (Measuring operation

after automatic wiping).

12. The calibration check is completed.

Figure 8 Changing wiper profile

1 Retaining strap 3 Wiper profile
2 Cap bottom 4 Locking the wiper and cap in place

27

Maintenance

Figure 9 Check the calibration (tank version)

1 NITRATAX sc 2 Pipette with standard solution

28

Maintenance

29

Section 7 Troubleshooting

7.1 Error messages

When the sensor is experiencing an error condition, the sensor reading on the
measurement screen will flash and the relays an analog outputs associated with this
sensor will be held. Errors are defined in Table 1.

From the Main Menu, select SENSOR STATUS and confirm to determine the cause of
the fault.

7.2 Warnings

A sensor warning will leave all menus, relays and outputs functioning normally, but will
cause a warning icon to flash.

Warnings may be used to trigger a relay and users can set warning levels to define the
severity. Warnings are defined in Table 2.

From the Main Menu, select SENSOR STATUS and confirm to determine the cause of
the fault.

Table 1 Error messages

Error Displayed Solution

NONE —

MOIST

Check MOIST value on the SENSOR-SETUP menu
>TEST/MAINT>MAINT. PROC.> SIGNALS>MOIST

Remove sensor from the tank and call service
R < M Call service
DEXT < 0.0 Complete a Zero point calibration
W. POS. UNKNOWN Check measuring path, complete a wiper test
W. BLOCKED Check measuring path, complete a wiper test
FLASH FAILURE Call service
R TOO HIGH Call service
Wiper sealing Call service, the wiper is deactivated
Sensor is missing Prove connection

Table 2 Warnings

Warning displayed Cause Solution

NONE Correct measuring operation —

EM TOO HIGH

Turbidity, organic content or nitrate

concentration too high, measuring range

exceeded as a result

Check measurement in the laboratory

CONC. TOO HIGH

Nitrate concentration too high, as a result

measuring range exceeded

Check measurement in the laboratory

CHECK CALIBR. Test interval elapsed Check calibration
REPLACE PROFILE Counter elapsed Change wiper profile
SERVICE REQUIRED Counter elapsed Call service
REPLACE SEALS Counter elapsed Call service
SHAFTSEALS REPL. Counter elapsed Call service
Inspection necessary Counter elapsed Call service

30

Troubleshooting

31

Section 8 Replacement Parts and Accessories

8.1 Replacement parts

Description Catalog Number

NITRATAX plus sc (1 mm/0.04 in.) LXV417.00.10000
NITRATAX plus sc (2 mm/0.08 in.) LXV417.00.20000
NITRATAX plus sc (5 mm/0.20 in.) LXV417.00.50000
NITRATAX clear sc (5 mm/0.20 in.) LXV420.00.50000
NITRATAX eco sc LXV415.00.10000
User Manual DOC023.52.03211

8.2 Accessories

Description Catalog Number

Cable extension set 5 m (16.4 ft) LZX848
Cable extension set 10 m (32.81 ft) LZX849
Cable extension set 15 m (49.21 ft) LZX850
Cable extension set 20 m (65.62 ft) LZX851
Cable extension set 30 m (98.43 ft) LZX852
Cable extension set 50 m (164.04 ft) LZX853
Cable extension set 100 m (328.08 ft) LZY339
Sensor bracket with 90° adapter LZY714.99.53220
Includes:

Base LZY827
Fastening lug LZY804
Retaining clamp (2x) LZX200
Mounting pipe 2 m LZY714.99.00020

Hardware HS LZY823
90° sensor adapter LZY714.99.50000
Set of small parts for mounting hardware LZY822
Extension pipe 1.8 m (5.91 ft) LZY714.99.00030
Extension pipe 1.0 m (3.28 ft) LZY714.99.00040
Second fastening point (with retaining clamp) LZY714.99.03000
Flow-through unit for NITRATAX plus sc (2 mm/0.08 in.) LZX869
Flow-through unit for NITRATAX plus sc (5 mm/0.20 in.) LZX867
Flow-through unit for NITRATAX clear sc (5 mm/0.20 in.) LZX866
Spare sealings LZX428
Tubing set LZX407
Allen key with setscrew LZX875
Sealing set for flow-through unit LZX572
Control standard 25 mg/L NO3 (5.56 mg/L NO3-N) LCW828
Control standard 50 mg/L NO

3

(11.3 mg/L NO3-N) LCW825
Control standard 100 mg/L NO3 (22.6 mg/L NO3-N) LCW826
Control standard 200 mg/L NO

3

(45.2 mg/L NO3-N) LCW827

Control standard 400 mg/L NO3 (90.4 mg/L NO3-N) LCW863

32

Replacement Parts and Accessories

8.3 Wearing parts

Description Catalog Number

Wiper profile (1 mm/0.04 in.) (5 pieces) LZX148
Wiper profile (2 mm/0.08 in.) (5 pieces) LZX012
Wiper profile (5 mm/0.20 in.) (5 pieces) LZX117

33

Section 9 Contact Information

HACH Company
World Headquarters

P.O. Box 389
Loveland, Colorado
80539-0389 U.S.A.
Tel (800) 227-HACH
(800) -227-4224
(U.S.A. only)
Fax [phone]
[e-mail]
www.hach.com

Repair Service in the
United States:

HACH Company
Ames Service
100 Dayton Avenue
Ames, Iowa 50010
Tel [phone]
(U.S.A. only)
Fax [phone]

Repair Service in Canada:

Hach Sales & Service
Canada Ltd.
1313 Border Street, Unit 34
Winnipeg, Manitoba
R3H 0X4
Tel [phone]
(Canada only)
Tel [phone]
Fax [phone]
[e-mail]

Repair Service in
Latin America, the
Caribbean, the Far East,
Indian Subcontinent, Africa,
Europe, or the Middle East:

Hach Company World
Headquarters,
P.O. Box 389
Loveland, Colorado,
80539-0389 U.S.A.
Tel [phone]
Fax [phone]
[e-mail]

HACH LANGE GMBH

Willstätterstraße 11
D-40549 Düsseldorf
Tel. [phone]
Fax [phone]
[e-mail]
www.hach-lange.de

HACH LANGE LTD

Pacific Way
Salford
GB-Manchester, M50 1DL
Tel. [phone]
Fax [phone]
[e-mail]
www.hach-lange.co.uk

HACH LANGE LTD

Unit 1, Chestnut Road
Western Industrial Estate
IRL-Dublin 12
Tel. [phone]
Fax [phone]
[e-mail]
www.hach-lange.ie

HACH LANGE GMBH

Hütteldorfer Str. 299/Top 6
A-1140 Wien
Tel. [phone]
Fax [phone]
[e-mail]
www.hach-lange.at

HACH LANGE GMBH

Rorschacherstrasse 30a
CH-9424 Rheineck
Tel. [phone]
Fax [phone]
[e-mail]
www.hach-lange.ch

HACH LANGE FRANCE
S.A.S.

8, mail Barthélémy Thimonnier
Lognes
F-77437 Marne-La-Vallée
cedex 2
Tél. [phone]
Fax [phone]
[e-mail]
www.hach-lange.fr

HACH LANGE NV/SA

Motstraat 54
B-2800 Mechelen
Tel. [phone]
Fax [phone]
[e-mail]
www.hach-lange.be

DR. LANGE NEDERLAND
B.V.

Laan van Westroijen 2a
NL-4003 AZ Tiel
Tel. [phone]
Fax [phone]
[e-mail]
www.hach-lange.nl

HACH LANGE APS

Åkandevej 21
DK-2700 Brønshøj
Tel. [phone]
Fax [phone]
[e-mail]
www.hach-lange.dk

HACH LANGE AB

Vinthundsvägen 159A
SE-128 62 Sköndal
Tel. [phone]
Fax [phone]
[e-mail]
www.hach-lange.se

HACH LANGE S.R.L.

Via Rossini, 1/A
I-20020 Lainate (MI)
Tel. [phone]
Fax [phone]
[e-mail]
www.hach-lange.it

HACH LANGE S.L.U.

Edificio Seminario
C/Larrauri, 1C- 2ª Pl.
E-48160 Derio/Vizcaya
Tel. [phone]
Fax [phone]
[e-mail]
www.hach-lange.es

HACH LANGE LDA

Av. do Forte nº8
Fracção M
P-2790-072 Carnaxide
Tel. [phone]
Fax [phone]
[e-mail]
www.hach-lange.pt

HACH LANGE SP. ZO.O.

ul. Krakowska 119
PL-50-428 Wrocław
Tel. [phone]
Zamówienia: [phone]
Doradztwo: [phone]
Fax [phone]
[e-mail]
www.hach-lange.pl

HACH LANGE S.R.O.

Zastrčená 1278/8
CZ-141 00 Praha 4 - Chodov
Tel. [phone]
Fax [phone]
[e-mail]
www.hach-lange.cz

HACH LANGE S.R.O.

Roľnícka 21
SK-831 07 Bratislava –
Vaj nory
Tel. [phone]
Fax [phone]
[e-mail]
www.hach-lange.sk

HACH LANGE KFT.

Vöröskereszt utca. 8-10.
H-1222 Budapest XXII. ker.

Tel. [phone]
Fax [phone]
[e-mail]
www.hach-lange.hu

HACH LANGE S.R.L.

Str. Căminului nr. 3,
et. 1, ap. 1, Sector 2
RO-021741 Bucureşti
Tel. [phone]
Fax [phone]
[e-mail]
www.hach-lange.ro

HACH LANGE

8, Kr. Sarafov str.
BG-1164 Sofia
Tel. [phone]
Fax [phone]
[e-mail]
www.hach-lange.bg

HACH LANGE SU
ANALİZ SİSTEMLERİ
LTD. ŞTİ.

Ilkbahar mah. Galip Erdem
Cad. 616 Sok. No:9
TR-Oran-Çankaya/ANKARA
Tel. [phone]
Fax [phone]
[e-mail]
www.hach-lange.com.tr

34

Contact Information

HACH LANGE D.O.O.

Fajfarjeva 15
SI-1230 Domžale
Tel. [phone]
Fax [phone]
[e-mail]
www.hach-lange.si

ΗΑCH LANGE E.Π.Ε.

Αυλίδος 27
GR-115 27 Αθήνα
Τηλ . [phone]
Fax [phone]
[e-mail]
www.hach-lange.gr

HACH LANGE D.O.O.

Ivana Severa bb
HR-42 000 Varaždin
Tel. [phone]
Fax [phone]
[e-mail]
www.hach-lange.hr

HACH LANGE MAROC
SARLAU

Villa 14 – Rue 2 Casa
Plaisance
Quartier Racine Extension
MA-Casablanca 20000
Tél. [phone]
Fax [phone]
[e-mail]
www.hach-lange.ma

HACH LANGE OOO

Finlyandsky prospekt, 4A
Business Zentrum “Petrovsky
fort”, R.803
RU-194044, Sankt-Petersburg
Tel. [phone]
Fax. [phone]
[e-mail]
www.hach-lange.com

35

Section 10 Warranty and liability

The manufacturer warrants that the product supplied is free of material and manufacturing
defects and undertakes the obligation to repair or replace any defective parts at zero cost.

The warranty period for instruments is 24 months. If a service contract is taken out within
6 months of purchase, the warranty period is extended to 60 months.

With the exclusion of the further claims, the supplier is liable for defects including the lack
of assured properties as follows: all those parts that, within the warranty period calculated
from the day of the transfer of risk, can be demonstrated to have become unusable or that
can only be used with significant limitations due to a situation present prior to the transfer
of risk, in particular due to incorrect design, poor materials or inadequate finish will be
improved or replaced, at the supplier's discretion. The identification of such defects must
be notified to the supplier in writing without delay, however at the latest 7 days after the
identification of the fault. If the customer fails to notify the supplier, the product is
considered approved despite the defect. Further liability for any direct or indirect damages
is not accepted.

If instrument-specific maintenance and servicing work defined by the supplier is to be
performed within the warranty period by the customer (maintenance) or by the supplier
(servicing) and these requirements are not met, claims for damages due to the failure to
comply with the requirements are rendered void.

Any further claims, in particular claims for consequential damages cannot be made.

Consumables and damage caused by improper handling, poor installation or incorrect use
are excluded from this clause.

The manufacturer process instruments are of proven reliability in many applications and
are therefore often used in automatic control loops to provide the most economical
possible operation of the related process.

To avoid or limit consequential damage, it is therefore recommended to design the control
loop such that a malfunction in an instrument results in an automatic change over to the
backup control system; this is the safest operating state for the environment and the
process.

36

Warranty and liability

37

Appendix A Modbus Register Information

Table 3 Sensor Modbus Registers

Group Name Register # Data Type Length R/W Description

measurement 40001 Float 2 R diplayed measurement value
unit 40003 Unsigned Integer 1 R/W unit : mg/l = 0 : g/l = 1
parameter 40004 Unsigned Integer 1 R/W parameter
Measure interval 40005 Unsigned Integer 1 R/W measuring interval
correction 40006 Float 2 R/W correction
offset 40008 Float 2 R/W offset
integration 40010 Unsigned Integer 1 R/W integration, always 1
cleaning_interval 40011 Unsigned Integer 1 R/W cleaning interval
wiper mode 40012 Unsigned Integer 1 R/W wiper mode
wiper state 40013 Unsigned Integer 1 R/W wiper state
resp time 40014 Unsigned Integer 1 R/W response time
drv_struct_ver 40015 Unsigned Integer 1 R driver structure version
drv_firmw_ver 40016 Unsigned Integer 1 R driver firmware version
drv_cont_ver 40017 Unsigned Integer 1 R driver content version
location 40018 String 5 R/W location
path length 40023 Float 2 R path length
profile 40025 Integer 2 R profile counter
motor_cycles 40027 Integer 2 R motor cycles
flash_counter 40029 Integer 2 R flash counter
sealing_counter 40031 Integer 2 R sealing counter
service_counter 40033 Integer 2 R service counter
operating_hours 40035 Integer 2 R operating hours
shaft_sealing_counter 40037 Integer 2 R shaft sealing counter
profile reset val 40039 Integer 2 R/W profile reset val
seals reset val 40041 Integer 2 R/W seals reset val
service reset val 40043 Integer 2 R/W service reset val
shaft seal reset val 40045 Integer 2 R/W shaft seal reset val
des_measurement 40047 Float 2 R desired measurement value
meas_single_value 40049 Float 2 R measurement single value
dext 40051 Float 2 R delta extiction
EM 40053 Float 2 R m - extiction
ER 40055 Float 2 R r - extiction
M 40057 Float 2 R m
R 40059 Float 2 R r
intensity_mes 40061 Float 2 R m - intensity
intensity_ref 40063 Float 2 R r - intensity
humidity_main 40065 Float 2 R humidity - main
conc_blank 40067 Float 2 R concentration whithout correction
cal_date 40069 Time 2 R calibration time and date
user_cal_date 40071 Time 2 R user calibration time and date
std_s3 40073 Float 2 R standard S3
cal_L1 40075 Float 2 R cal. point 1

38

Modbus Register Information

cal_L2 40077 Float 2 R cal. point 2
cal_L3 40079 Float 2 R cal. point 3
cal_mes 40081 Float 2 R m - calibration
cal_ref 40083 Float 2 R r - calibration
cal_intensity_mes 40085 Float 2 R intensity m - calibration
cal_intensity_ref 40087 Float 2 R intensity r - calibration
cal_ext 40089 Float 2 R extinction - calibration
process 40091 Unsigned Integer 1 R/W process register
menu 40092 Unsigned Integer 1 R menu state

gain_ref 40093 Integer 1 R

low byte = gain ref-channel, high
byte = second cap. on/off

gain_mes 40094 Integer 1 R

low byte = gain mes-channel, high

byte = second cap. on/off
wiper_lim_a 40095 Integer 1 R wiper limit a
wiper_lim_b 40096 Integer 1 R wiper limit b
wiper_lim_out 40097 Integer 1 R wiper limit out
prg_vers 40098 String 4 R program version
ser_no 40102 Integer 2 R serial number
cal_out_cfg 40104 Integer 1 R cal. Output mode
user_cal_int 40105 Integer 1 R/W user calibration interval
wiper_current 40106 Integer 1 R wiper motor current in mA
resp_time_min 40107 Integer 1 R response time in min
flash_per_fil 40108 Integer 2 R flash per filter
cm1 40110 Float 2 R/W meas. Cap 1
cm2 40112 Float 2 R/W meas cap 2
cr1 40114 Float 2 R/W ref cap1
cr2 40116 Float 2 R/W ref cap2
lambda_m 40118 Float 2 R/W lambda meas
lambda_r 40120 Float 2 R/W lambda ref
transm_m 40122 Float 2 R/W transmission meas
transm_r 40124 Float 2 R/W ransmission ref
cal_menu 40126 Unsigned Integer 1 R/W cal menu
wiper_menu 40127 Unsigned Integer 1 R/W wiper menu
maint_menu 40128 Unsigned Integer 1 R/W maint_menu
service_menu 40129 Unsigned Integer 1 R/W service menu
flash_repl 40130 Unsigned Integer 1 R/W flash replaced question
edit_menu 40131 Unsigned Integer 1 R/W edit menu
def_menu 40132 Unsigned Integer 1 R/W default menu
filter_data_menu 40133 Unsigned Integer 1 R/W filter data menu
prod_date 40134 Time 2 R production date
sensor_type 40136 String 8 R/W sensor type
filter_set 40144 String 3 R/W filter set
user_cal_counter 40147 Integer 1 R user cal. Counter
pos_out_en 40148 Unsigned Integer 1 R/W pos. Out enable

Table 3 Sensor Modbus Registers (continued)

39

Index

A

Accessories .............................................................. 31

C

Calibration ................................................................ 20

Check up ........................................................ 26

Cleaning

Measuring path ............................................... 24

D

Data logging ............................................................. 17

Dimensions ............................................................ 3, 5

E

Error Messages ........................................................ 29

I

Installation ................................................................ 11

M

Maintenance ............................................................ 23

Maintenance Schedule ............................................ 23

Modbus .................................................................... 37

P

Pin assignment ......................................................... 13

S

Sensor

Calibration ...................................................... 20

Diagnostics menu ........................................... 18

overview ........................................................... 8

Sensor setup ............................................................ 17

Specifications ............................................................. 3

T

Theory of operation .................................................... 9

Troubleshooting ....................................................... 29

Turbidity compensation ............................................ 22

U

Unpacking ................................................................ 12

W

Warnings .................................................................. 29

Wear part ................................................................. 32

Weight ........................................................................ 3

Wiper profile ............................................................. 25

40

Index