Online Nitrate Determination - Endress+Hauser

Quality made byEndress+Hauser

ISO 9001

Technical InformationTI 215C/07/en/09.0251502579

Online Nitrate DeterminationStamoSens CNM 750 / CNS 70

Photometric analysis system for the determination of nitrate in the denitrification step and in the outlet of wastewater treatment plants

Application

• Monitoring of nitrate content in the outlet of wastewater treatment plants

• Monitoring and optimising denitrification processes

Your benefits

• Economy-priced and ecological measuring process

• No sample taking or conditioning system required

• No chemicals required• Service friendly design• Very short response time• In-situ calibration• Measured value preparation in the

sensor, therefore low interference susceptibility on signal transfer

• Measured values stored by data logger

StamoSens CNM 750 / CNS 70

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Function and system design

Measuring principle The sensor light source transmits an ultraviolet light beam through the medium. The transmission light is diverted by means of an optical system consisting of mirrors and lenses. The received light is measured by a photodiode. The part of light absorbed by the medium is proportional to the concentration of the measured value (see input).Additionally, a reference beam is measured to compensate interference due to suspended solids and organic substances .

Measuring system A complete measuring system comprises:• a transmitter CNM 750• a sensor CNS 70• an immersion assembly with pendulum frame

Optionally:• Cleaning unit with compressor• Mounting post and weather protection cover

Co7-CXM750xx-14-08-00-xx-001.eps

Complete measuring system

123

45678910

Transmitter CNM 750Weather protection coverCompressor housing (optionally, only with cleaning unit)Mounting postPower supplySignal outputImmersion assemblyPendulum frameSensor CNS 70Cleaning unit (optionally)

M CE E KPOWER

ON

OFF

ENDRESS+HAUSERSTAMOSENS➀

➁

➂

➃

➄➅ ➆

➇

➈➉


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Input

Measured variable NO3-N [mg/l], NO3 [mg/l]

Measuring range

Wavelength Nitrate absorbance maximum

Output

Output signal 0/4 ... 20 mA, galvanically separated

Signal on alarm 2 limit contact, 1 alarm contact

Contact switching power 230 V AC / 3 A, 30 V DC / 1 A

Load max. 500 Ω

Data interface RS 232 C, slot for bus extension

Power supply

Electrical connection

C07-CXM750xx-04-00-00-a2-001.eps

Electrical connection transmitter with power supply 80 ... 250 V AC

C07-CXM750xx-04-00-00-a2-002.eps

Electrical connection transmitter with power supply 24 V AC/DC

Supply voltage 80 ... 250 V AC ±10%, 50/60 Hz24 V AC/DC

Power consumption max. 15 VA

Clear water 0.2 ... 60 mg/l NO3-N bzw. 0 ... 260 mg/l NO3Activated sludge 0.2 ... 30 mg/l NO3-N bzw. 0 ... 130 mg/l NO3


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Connection of the cleaning unit

C07-<CXM750xx-04-00-00-de-001.eps

Connection of the cleaning unit

Performance characteristics

Response time t90 ≥ 60 s, selectable

Maximum measured error ± 2 % of upper range value

Repeatability 0,5 % (with homogeneous media)

Measuring interval ≥ 40 s, selectable

Fuse

PE L1 N PE

T

1A

CNM 750

1

230V AC / 50Hzor115V AC / 60Hz

L1

16

N2

3

18


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Installation

Installation instructions Sensor holder

Caution! Do not install the sensor suspended from the cable. Use a wall bracket or an immersion assembly with pendulum frame for sensor mounting.

C07-CXS70xxx-00-05-00-xx-001.eps

Wall bracket for sensor

C07-CXS70xxx-00-05-00-xx-003.eps

Immersion assembly for sensorC07-CXS70xxx-00-05-00-xx-002.eps

Pendelum frame for immersion assembly

200

100

15

120 15470 88

25

15

Ø7 x14

Ø128

50

55

R 1 1/2

6520

00

Ø 40

130

130

258

250

Ø11


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Weather protection cover and round post mount (accessories, optionally)

Environment

Ambient temperature –20 ... 60 °C

Ingress protection IP 68 (sensor, up to 1 bar)

Process

Medium temperature 2 ... 40 °C

Medium pressure max. 1 bar

Solid content

C07-CYY101xx-00-00-00-xx-001.eps

Weather protection cover CYY 101C07-CYY102xx-00-00-00-xx-001.eps

Round post mount CYY 102

270

320

300

150

120

450

950

1500

4 x Ø12

Activated sludge sensor 2,5 g/l ... < 8 g/lClear water sensor < 2 g/l


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Mechanical construction

Design, dimensions

C07-CXM750xx-06-00-00-xx-001.eps

Dimensions transmitter, 1=front view, 2= side view, 3=top view, 4=back view

C07-CXS70xx-06-05-00-xx-001.eps

Dimensions sensor

Weight

Materials

Process connection Sensor head G 1½

Cable specification

241

ENDRESS+HAUSERSTAMOSENS

198➀ ➁

➃

➂

329

185

60

60

69

2614

515

212

198

145

15

115

Ø 1

27

G 1

½

360

Transmitter approx. 1,6 kgSensor approx. 5 kg

Sensor head Stainless steel 1.4571 (AISI 316 L)Sensor optical windows Quartz glassSensor housing POM

Cable length: 7 m oder 15 m (cable with plug)Cable extension: up to 200 m (with sensor connection box, s. accessories)


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Human Interface

Display elements

C07-CXM750xx-07-00-00-de-001.eps

Display and operating elements

1 LED (measured value)2 LC display (status)3 Operating keys4 Indicator LEDs5 Mains switch

Certificates and approvals

approval Declaration of conformityThe product meets the legal requirements of the harmonised European standards. Endress+Hauser confirms compliance with the standards by affixing the symbol.

Test reports Quality certificateDepending on the order code you receive a quality certificate.With the certificate Endress+Hauser confirms compliance with all technical regulations and the successful testing individually for your product.

M CE E K

ENDRESS+HAUSERSTAMOSENS

ON

OFF

POWER

➀

➃ ➄➂

➁

Messwert

18.0 mg/l-N


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Ordering information

Product structure Power supply7 Power supply 80 ... 250 V AC8 Power supply 24 V AC/DC9 Special version acc. to customers specification

Communication / OutputA RS 232 + 0/4 ... 20 mAY Special version acc. to customers specification

Version1 One channel version9 Special version acc. to customers specification

Additional equipmentA Quality certificateY Special version acc. to customers specification

CNM 750 - complete order code

ApplicationA Clear waterB Activated sludge with cleaning unit 230 VC Activated sludge with cleaning unit 115 VY Special version acc. to customers specification

Measuring range4 Measuring range 0.2 ... 30 mg/l NO3-N (activated sludge)5 Measuring range 0.2 ... 60 mg/l NO3-N (Clear water)9 Special version acc. to customers specification

Cable lengthB Cable length 7 mD Cable length 15 mY Special version acc. to customers specification

Version1 Without assembly2 Immersion assembly 2 m + pendulum frame with 250 mm wall spacing3 Sea water version4 Immersion assembly 2 m, 90° offset + pendulum frame w. 250 mm wall spacing9 Special version acc. to customers specification

Additional equipmentA Quality certificateY Special version acc. to customers specification

CNS 70 - complete order code


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Accessories Weather protection cover CYY 101,

for field mounting of the transmitter;order no. 50061258

Round post mount CYY 102,for weather protection cover mounting to vertical or horizontal pipes;order no. 50064291

Immersion assemblylength 2 m; order no. 51502959length 3 m; order no. 51502960special length; order no. 50066036

Wall bracket,for transmitter;order no. 51508576

Pendulum frame,for sensor;wall spacing 250 mm; order no. 51502962special version; order no. 50066036

Compressor attachment;order no. 51505419

Cleaning unit,230 V; order no. 51504764115 V; order no. 51504765

C07-CXM750xx-00-00-00-xx-010.eps

Cleaning unit for sensor

Extension cable,cable length 10 m, with plug and coupling;order no. 51502953

Plug,7-pin plug, IP 67;order no. 51502954

Coupling;order no. 51502955

Control line,50 m, 6 x 0,34;order no. 51503015

Sensor terminal housing,for cable extension from transmitter to sensor;order no. 51502956

ID 6


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Flow assembly for drinking water application,with reduction of the dead volume, stainless steel 1.4571 (AISI 316 Ti) / PVDF;order no. 51509332without reduction of the dead volume, stainless steel 1.4571 (AISI 316 Ti) / PVDF;order no. 51509333

C07-CXM750xx-00-00-00-xx-008.eps

Flow assembly

A Hose connection inletID 1.6 mm (with dead volume reduction)ID 6.4 mm (without dead volume reduction)

B Hose connection inletID 1.6 mm (with dead volume reduction)ID 6.4 mm (without dead volume reduction)

C Split pin for dead volume reduction

C07-CXM750xx-00-00-00-a2-001.eps

Sensor terminal housingC07-CXM750xx-00-00-00-de-002.eps

Sensor connection to sensor terminal housing

110

Sensor Pg 11

75

→→←←←→

1

2

3

4

5

6

7

+15 V / ca. 180 mA

-15 V / ca. 150 mA

Lichtstärke 0-20 mA

fx / 12 V

Merker / 12 V

RESET / 12V

1

2

3

4

5

6

7

DoseSteckerWH

BN

GN

YE

GR

BU

BK

WH

BN

GN

YE

GR

BU

BK

0V

127

160

5050

B

G ¼

AC

Ø 6.6 60

Endress+Hauser GmbH+Co. KGInstruments InternationalP.O. Box 2222D-79574 Weil am RheinGermany

Tel. (07621) 975-02Tx 773926Fax (07621) 975 345e-mail: [email protected]

Internet:http://www.endress.com

11.01

TI 215C/07/en/09.0251502579Printed in Germany / FM+SGML 6.0 / DT

Online Nitrate Determination - Endress+Hauser

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