254nm UV Absorption Online COD Analyzers RS485 Digital Communication

UV Absorption COD Sensor

Measure Principle

UV 254 nm absorption

Compensation

Turbidity at 530 nm

Wave lengths

Internal temperature

Type of detector

254 nm (turbidity correction at 530 nm)

Light sources

Silicon Photodiode

Optical paths

LED UV 254±5nm and 530±5 nm

Measurement frequency

2 and 50 mm

Protection Grade

IP68

Max. immersion depth

50 meters

Maximum pressure

5 bars

Operating temperature

0~40°C

Storage temperature

-10°C~50°C

PH range

2~12pH

Dimensions (D x L) (mm)

48x371 or 48x419 (see overall dimensions diagram)

Weight

1600~1800g depending on the optical path (cable not included)

Equipment

Body: Stainless steel 316 (1.4401)

Optical windows: Quartz (Corning 7980)

Cable: Bare wire with polyurethane sheath

Seals: Fluoroelastomer (FPM/FKM)

Cable

9 shielded conductors in 3,7 and 15m.

Other lengths on request

Signal interface

Modbus¹ RTU (RS-485) / SDI12^2,3 (TTL)

1 Sensor mute in Modbus for up to 2s between the measurement request and the possibility to read the measurements or status

2 Using SDI12, measurement result frame after up to 2s instead of the 850ms standard delay. The sensor responds in Modbus / SDI12 including when on Standby

3 The use and connexion of SDI12 bus may increase the standby power consumption* up to 40uA depending the level of the line (high or low). The consumption is not increased if the SDI12 line is disconnected or released to 0V (Modbus RTU only).

Sensor power supply

5.4 V ^1,2 at 26 V ³ DC

1 Absolute minimum 5.2 V with 1 m of cable

2 Minimum voltage subject to cable length-related losses

3 28.0 V absolute maximum

Typical consumption at 5.4 V

Automatic standby less than 10 μA (54 μW)

Maximum peak current: 600 mA (2 ms)

Maximum current during the measurement: 100 mA (540 mW)

Average current during the measurement: 70 mA (378 mW)

Average current (1 measurement / 2s): 35 mA (189 mW)

Energy for 1 measurement (1.5 s): 158 μWh

Typical consumption at 12 V

Automatic standby less than 10 μA (120 μW)

Maximum peak current: 400 mA (1.5 ms)

Maximum current during the measurement: 70 mA (840 mW)

Average current during the measurement: 60 mA (720 mW)

Average current (1 measurement / 2s): 30 mA (360 mW)

Energy for 1 measurement (1.5 s): 300 μWh

Typical consumption at 24 V

Automatic standby less than 10 μA (240 μW)

Maximum peak current: 300 mA (1 ms)

Maximum current during the measurement: 65 mA (1560 mW)

Average current during the measurement: 50 mA (1200 mW)

Average current (1 measurement / 2s): 25 mA (600 mW)

Energy for 1 measurement (1.5 s): 500 μWh

EMC compliance

NF EN 61326-1: 2013-05

RS-485 Modbus RTU & SDI12

1 The sensor is qualified for standard use with a dedicated cable including power supply and communication lines specific to the sensor network.

2 When connected to a DC power supply network separated from the RS485 communication lines; additional shielding must be used on the system to protect the sensors from shock waves from an impact.

Op.T

Parameters

Quantification Limit

SEC₂₅₄

0-750

Abs/m

1.7

5.0

1 or +/-3%

Wastewater

CODeq

0-1300

mg/L

3.0

9.0

2 or +/-3%

BODeq

0-350

mg/L

1.0

3.0

1 or +/-3%

TOCeq

0-500

mg/L

1.5

4.0

1 or +/-3%

Turbidity eq

0-500

FAU

1.5

5.0

5 or +/-5%

SEC₂₅₄

0-30

Abs/m

0.20

0.3

0.1 or +/-3%

CODeq

0-50

mg/L

0.15

0.6

0.2 or +/-3%

BODeq

0-15

mg/L

0.10

0.2

0.1 or +/-3%

TOCeq

0-20

mg/L

0.10

0.2

0.1 or +/-3%

Turbidity eq

0-40

FAU

0.40

1.0 or +/-7%