TriOS OPUS UV Spectral Sensor

OPUS is a full spectrum sensor that can deliver reliable readings for nitrate, nitrite, COD, BOD, DOC, TOC, and a number of other parameters.

Features

  • Internal compensation for temperature, turbidity, and organic substances
  • RS-485 Modbus RTU output for integration with data collection platforms
  • Optional W55 V2 wiper cleans optics & reduces maintenance intervals
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OPUS is a spectral sensor for the online measurement of nitrogen and carbon compounds. By analyzing a full spectrum, OPUS is able to deliver reliable readings for N-NO3, N-NO2, organic ingredients (COD, BOD, DOC, TOC) and a number of other parameters.

Substances with a specific absorption spectrum, such as nitrate and nitrite, can be used directly as elements of the spectral analysis group. For sum parameters, such COD, BOD, TOC and DOC, theoretical absorption spectra that TriOS has been able to determine over the course of its many years of experience have been stored. Using these parameters, a spectral analysis based on UV absorption can use only the portion that absorbs UV light. Therefore, the OPUS uses only equivalents, and the parameters have the “eq” suffix appended to them, (i.e. CODeq, BODeq, TOCeq and DOCeq). The spectral analysis group also contains correction spectra that take into account, for example, the effects of turbidity. Because the entire absorption spectrum is detected, parameters such as SAC254 (spectral absorption coefficient at 254nm) can also be calculated.

The OPUS is compatible with the G2 interface box, allowing fast and easy configuration of the sensors using a web browser. The sensor can be easily integrated into existing process control systems and external data loggers using the native RS-485 Modbus RTU output, and the optional W55 V2 wiper reduces maintenance intervals by cleaning the optics before each measurement.

Light source
Xenon flash lamp
Detector
High-end miniature spectrometer
256 Channels
200 to 360 nm
0.8 nm/pixel
Measurement principle
Attenuation, spectral analysis
Optical path
0.3mm, 1mm, 2mm, 5mm, 10mm, 20mm, 50mm
 
Parameter
Nitrate NO3-N, Nitrite NO2-N, CODeq, BODeq, DOCeq, TOCeq,
TSSeq, KHP, SAC254, COD-SACeq, BOD-SACeq
Measurement accuracy
See measurement ranges below
Turbidity compensation
Yes
Data logger
~ 2 GB
T100 response time
2 min
Measurement interval
≥ 1 min
 
Housing material
Stainless steel (1.4571/1.4404) or titanium (3.7035)
Dimensions (L x Ø)
470 mm x 48 mm (bei 10 mm path)
~ 18.5“ x 1.9“ (with 10 mm path)
Weight stainless steel
~ 3 kg (bei 10 mm path)
~ 6.6 lbs (with 10 mm path)
Weight titanium
~ 2 kg (bei 10 mm path)
~ 4.4 lbs (with 10 mm path)
 
Interface digital
Ethernet (TCP/IP), RS-232 or RS-485 (Modbus RTU)
Power consumption
≤ 8 W
Power supply
12...24 VDC (± 10 %)
 
 
Maintenance effort
≤ 0.5 h/month (typical)
Calibration/maintenance interval
24 months
System compatibility
Modbus RTU
Warranty
1 year (EU: 2 years)
US: 2 years
 
Max. pressure with SubConn
30 bar
~ 435 psig
Max. pressure with fixed cable
3 bar
~ 43.5 psig
Max. pressure in FlowCell
1 bar, 2...4 L/min
~ 14.5 psig at 0.5 to 1.0 gpm
Protection type
IP68
NEMA 6P
 
Sample temperature
+2...+40 °C
~ +36 °F to +104 °F
Ambient temperature
+2...+40 °C
~ +36 °F to +104 °F
Storage temperature
-20...+80 °C
~ -4 °F to +176 °F
Inflow velocity
0,1...10 m/s
~ 0.33 fps to 33 fps

 

 

Parameter
Measurement Principle
Unit
Factor
 
Path Length (mm)
 
 
 
 
0.3
1
2
5
10
20
50
absorbance
spectral
AU**
-
0.01...2.2
0.01...2.2
0.01...2.2
0.01...2.2
0.01...2.2
0.01...2.2
0.01...2.2
absorbance
spectral
1/m
-
50...7300
15...2200
7.5...1100
3...440
1.5...220
0.75...110
0.3...44
Nitrate N-NO3
spectral
mg/L
-
1.0...330
0.3...100
0.15...50
0.06...20
0.03...10
0.015...5
0,006...2
Nitrate NO3
spectral
mg/L
-
4.43...1460
1.33...440
0.67...220
0.27...88
0.13...44
0.067...22
0.030...9
Nitrite N-NO2
spectral
mg/L
-
1.7...500
0.5...150
0.25...75
0.1...30
0.05...15
0.025...7.5
0.01...3
Nitrite NO2
spectral
mg/L
-
5.6...1650
1.65...500
0.82...250
0.33...100
0.17...50
0.083...25
0.033...10
DOCeq
spectral
mg/L
-
17...3300
5.0...1000
2.5...500
1.0...200
0.5...100
0.25...50
0.1...20
TOCeq
spectral
mg/L
-
17...3300
5.0...1000
2.5...500
1.0...200
0.5...100
0.25...50
0.1...20
CODeq
spectral
mg/L
-
100...7300***
30...2200***
15...1100***
6.0...440***
3.0...220***
1.5...110***
0.6...44***
BODeq
spectral
mg/L
-
100...7300***
30...2200***
15...1100***
6.0...440***
3.0...220***
1.5...110***
0.6...44***
KHP
spectral
mg/L
-
17...13300
5.0...4000
2.5...2000
1.0...800
0.5...400
0.25...200
0.1...80
SAC254
Single wavelength
1/m
-
50...7300
15...2200
7.5...1100
3.0...440
1.5...220
0.75...110
0.3...44
COD-SACeq****
Single wavelength
mg/L
1.46
75...10600
22...3200
11...1600
4.4...640
2.2...320
1.1...160
0.44...64
BOD-SACeq*****
Single wavelength
mg/L
0.48
24...3500
7.2...1050
3.6...525
1.44...210
0.72...105
0.36...52.5
0.15...21
 
TSSeq*****
Single wavelength
mg/L
2.6
130...4300
40...1300
20...650
8.0...260
4...130
2.0...65
0.8...26
 
           
under laboratory conditions
** absorbance unit
*** depending on the composition of the COD and BOD (sum parameter)
**** based on KHP (Note: 100 mg/L COD-standard-solution corresponds to 85 mg/L KHP)
***** based on SiO2
 
Note:
1 mg/L N-NO3 corresponds to 4.43 mg/L NO3
1 mg/L N-NO2 corresponds to 3.28 mg/L NO2
 
  • (1) OPUS UV Spectral Sensor
  • (1) Fitting for compressed air cleaning
  • (1) Calibration certificate
  • (1) Operations manual
  • Note: Included parameters are temperature, SAC254, and TSS. Addtional parameters must be ordered separately as calibrations (see Accessories tab).
Questions & Answers
What is the spectral range of the spectrometer?
The detector has a range of 200 to 360 nm.
Can this sensor measure nitrate in seawater?
Yes, the OPUS has the ability to measure nitrate (NO3) in seawater. In addition to the sensor, the seawater calibration for NO3 will be required (see Accessories tab).
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TriOS OPUS UV Spectral Sensor
12S401000
OPUS UV spectral sensor with 10mm path length & stainless steel housing, 10m cable with M12 connector
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TriOS OPUS UV Spectral Sensor
12S401010
OPUS UV spectral sensor with 10mm path length & stainless steel housing, MCBH-8-MP connector
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TriOS OPUS UV Spectral Sensor
12S402010
OPUS UV spectral sensor with 10mm path length & titanium housing, MCBH-8-MP connector
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TriOS OPUS UV Spectral Sensor
12S301000
OPUS UV spectral sensor with 5mm path length & stainless steel housing, 10m cable with M12 connector
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TriOS OPUS UV Spectral Sensor
12S301010
OPUS UV spectral sensor with 5mm path length & stainless steel housing, MCBH-8-MP connector
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TriOS OPUS UV Spectral Sensor
12S302010
OPUS UV spectral sensor with 5mm path length & titanium housing, MCBH-8-MP connector
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TriOS OPUS UV Spectral Sensor
12S201000
OPUS UV spectral sensor with 2mm path length & stainless steel housing, 10m cable with M12 connector
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TriOS OPUS UV Spectral Sensor
12S201010
OPUS UV spectral sensor with 2mm path length & stainless steel housing, MCBH-8-MP connector
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TriOS OPUS UV Spectral Sensor
12S202010
OPUS UV spectral sensor with 2mm path length & titanium housing, MCBH-8-MP connector
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