Theory of operation
The sensor uses two LEDs for long-term stable measurements of SAC values or color numbers at a
different wavelengths.
shows the applicable parameters based on the sensor type.
The light intensity of the LEDs usually changes with the temperature. The sensor uses a correction
factor for each different wavelength to calculate the measurement value. The absorbance is
calculated with the formula that follows:
A = -log
10
T
T = I / I
0
where:
T = transmission in %
I = current light intensity
I
0
= basic light intensity in ultra-pure water
A = absorption in AUs (absorbance units)
Based on the model, the sensor outputs the SAC (Spectral Absorption Coefficient) of the wavelength
of LED1. The wavelength and absorption of LED1 is labelled in the sub-index SAC
xxx
and A
xxx
. The
wavelength of LED2 is 740 nm. The scattering of light on particles in a solution is seen as turbidity.
The sensor uses the absorbance of 740 nm (A
740
) for the turbidity correction of the absorption
measurement of the wavelength emitted by LED1. The SAC of each wavelength of LED1 is
calculated with the formula that follows:
SAC
XXX
= (A
xxx
– A
740
) * 1000 / d
where:
d = length of the optical path of the sensor in mm
SAC = spectral absorption coefficient in 1/m
Table 2 SAC parameter
Parameters
Unit
Factor
4
LED 1 (nm)
LED 2 (nm)
In agreement with
SAC 436
1/m
—
436
740
DIN EN ISO 7887:2011_method B
Installation
C A U T I O N
Multiple hazards. Only qualified personnel must conduct the tasks described in this section of the
document.
Installation guidelines
Note: Make sure that the enclosure of the probe is titanium before use in sea water.
• Do not use stainless steel probes in sea water or other corrosion-causing media (e.g., acids,
alkalis, chlorine-based compounds). Clean the probe immediately.
• Do not use titanium probes in bromine, hydrofluoric acid and hot acids. Clean the probe
immediately if the probe touches hydrofluoric acid or hot acids.
• The seals of the probe are made of NBR (nitrile butadiene rubber). Make sure that the measuring
medium does not cause damage to the probe components.
• Do not replace the cable. If the cable has damage, contact the manufacturer.
• Make sure that the cable is not routed near hot surfaces. Make sure not to put heavy objects on
the cable.
• Make sure that there are no unwanted materials in the optical path.
4
In some applications it is necessary to enter a factor to scale the SAC at a specified
wavelength.
8
English
Summary of Contents for NV3300
Page 2: ...English 3 Fran ais 19 Espa ol 35 51 67 Portugu s 82 98 114 2...
Page 53: ...ESD 53...
Page 54: ...NV3300 SAC Spectral Absorption Coefficient 1 8 LED 4 50 100 150 250 mm 51 CD500 CD300 54...
Page 55: ...1 1 4 2 5 3 6 2 2 1 2 55...
Page 57: ...OFF 3 4 5 3 57...
Page 58: ...4 1 6 mm 3 2 4 8 mm 5 58...
Page 59: ...M12 10 m 6 7 COM COM 6 7 3 1 RS232 RX RS485 A 2 3 ETH_TX 4 ETH_TX 5 12 24 VDC 6 ETH_RX 59...
Page 64: ...MSDS SDS 1 Options 2 Service mode HOLD 3 4 5 Service mode HOLD 1 1 2 2 1 62 2 3 4 64 5 64...
Page 69: ...ESD TV 69...
Page 70: ...NV3300 SAC 1 8 LED 4 50 100 150 250 mm 67 CD500 CD300 1 1 4 2 5 3 6 2 70...
Page 72: ...2 SAC 4 LED 1 nm LED 2 nm SAC 436 1 m 436 740 DIN EN ISO 7887 2011_method B NBR OFF 3 4 5 72...
Page 73: ...3 4 1 6 mm OD 3 2 4 8 mm OD 73...
Page 74: ...5 M12 10 m 6 7 COM COM 6 74...
Page 76: ...8 1 3 2 4 1 Options 2 Cleaning 3 15 5 10 mA 5 Execute Sensor 5 76...
Page 79: ...MSDS SDS 1 Options 2 Service mode HOLD 3 4 5 Service mode HOLD 1 2 1 77 2 3 4 79 5 79...
Page 100: ...ESD 100...
Page 101: ...NV3300 SAC 1 8 LED 4 50 100 150 250 98 CD500 CD300 101...
Page 102: ...1 1 4 2 5 3 6 2 2 1 2 102...
Page 104: ...OFF 3 4 5 3 104...
Page 105: ...4 1 OD 6 3 2 4 OD 8 5 105...
Page 107: ...3 8 7 ETH_RX 8 RS232 TX RS485 B 7 1 13 0 5 8 2 8 3 HOAB 3 6 25 82 108 8 1 3 2 4 107...
Page 111: ...1 Options 2 Service mode HOLD 3 4 5 Service mode HOLD 1 1 2 2 1 109 2 3 4 110 5 111...
Page 116: ...ESD 116...
Page 117: ...NV3300 SAC 1 8 LED 4 50 100 150 250 mm 114 CD500 CD300 1 1 4 2 5 3 6 2 117...
Page 119: ...NBR OFF 3 4 5 3 119...
Page 120: ...4 1 6 mm 3 2 4 8 mm 5 120...
Page 121: ...10 M12 6 7 COM COM 6 7 M12 3 8 1 RS232 RX RS485 A 2 3 ETH_TX 4 ETH_TX 5 12 24 V 6 ETH_RX 121...
Page 128: ......
Page 129: ......
