Supertron Sensing Pte Ltd

TC007 Complete Turbidity Control

The Kemtrak TC007 is an industrial fiber optic turbidimeter designed to accurately measure the concentration of light scattering components.The Kemtrak TC007 measures attenuated light and/
or scattered light which is mathematically combined using a ratio algorithm to accurately monitor the turbidity of the sample.

Since optic fibers are used to pipe light to the measurement point
and back, the measurement cell contains no electronics, moving
parts or sources of heat that result in condensation on the optical
surfaces. Standard measurement cells are machined in sanitary grade stainless steel with sapphire glass.

• Real time in-line turbidity measurement
• No maintenance
• Reliable and robust infrared LED lamp
• Fiber optics - no condensation & intrinsically safe (ATEX)
• Extensive range of sensor designs and materials
• Alarm signals for data and system failures
• ISO 7027:1999(E) compliant

Housing	Glass-fibre reinforced polyester & polyester front panel Captive lid screws & external mounting brackets stainless steel 220 x 120 x 90 mm (8.66 x 4.72 x 3.54 inch) L x W x D IP 65 / EN 60529
Display	16 x 2 alphanumeric dot matrix LCD display LED background illuminated Display update 0.5 seconds LED 1 (green): power on LED 2 (red): alarm LED 3 (red): clean
Operation	4 push buttons
Measurement Method	Attenuated light, scattered light or a combination of both using a nephelometric ratio algorithm ISO7027:1999(E) measuring scattered light at 90°
Measurement Range	90° 1 - 100 NTU/FTU resp. 0.25 - 25 EBC 0° 20 - 2 000 NTU/FTU resp. 5 - 1 000 EBC 180° 1 000 - 10 000 NTU/FTU resp. 250 - 2 500 EBC Other units of measurement available e.g. ASBC-FTU, Helms, ppm etc
Resolution	1 - 100 NTU 0.1 NTU (0.025 EBC) 100- 1 000 NTU 1 NTU (0.25 EBC) 1 000 - 10 000 NTU 10 NTU (2.5 EBC)
Repeatability	Typically <1% of respective measuring range
Accuracy	Typically < ±2% at the calibration points
Remote Input	1 x Digital input (potential free contact) for: • Auto clean • Zero • Hold output
mA Output	1 x 0/4 - 20 mA galvanically isolated Accuracy: <0.2% Resolution: < 0.05% Load: 0 - 400 Ohm
Relay Outputs	2 x 0.5A 240VAC User configurable (alarm, PID, system fault) 1 x 0.5A 240VAC Automatic cleaning control PTC resistor fuses in series with the relays LED status indicators flash when relays are active
Fail-Safe:	Relay output & 0/4-20mA value
Operating Conditions	Ambient temperature: -10°C to +50°C (14°F to 122°F) Transport: -20°C to +70°C (-4°F to 158°F)
Power Supply	115/230V AC selectable, 50-60Hz, 1A
Power Consumption	25 VA (max.)
Data Logger	• 6 900 data points (timestamp, average, max. & min.), ring buffer • Configurable log time interval 1s to 24hr
Event Logger	• 10 000 events • Alarms, zeroing, cleaning, calibration & system events (power,system failures, high/low system temperature)
Automatic Cleaning Control	• Automatic cleaning sequence with dedicated relay output • Manual trigger or external trigger via digital input • Configurable automatic cleaning interval, 15min to 24hr • Configurable cleaning duration from 0 to 9999s • Auto-zero after clean option • Hold value after clean (to equilibrate) 0 to 9999s
Light Source	High performance infrared LED lamp Wavelength: 880 nm Typical lamp lifetime: >100 000 hrs
Manifolds	Standard designs include DIN Flange (DIN 2633), Tri-Clamp® (ISO 2852& DIN 32676), Sanitary Thread SC (DIN 11851), Straight Pipe Thread (DIN ISO 228 BSP), Line size up to DN100.
Materials	Standard material stainless steel EN 1.4435 / 316L. Other materials include Titanium, Hastelloy C-276, PEEK, TFMC (TFM 25% Carbon), PCTFE, PVC-C, PVDF
Elastomers	NBR (nitrile),FKM (FPM, Viton®, Fluorel®), EPDM, Silicone, Neoprene (CR) and others
Operating Conditions	Ambient & process temperatures up to 200°C (392°F) Process pressure from 10 mbar to 100 bar Operating conditions subject to material and design in use
Protection	ISO 9001:2000, CE, ATEX (option - I I 2 GD EExd-IIB-T5 IP65)
Certificates	IP66 / EN 60529, ATEX (option)

The Kemtrak TC007 turbidimeter consists of three components:

• Control Unit. The control unit contains all electronics including NIR light source and detectors.
• Flow Cell. In-line (flow through) measurement cell with an optional 90° port for measurement of scattered light (ISO7027:1999(E)).
• Fibre Optics. Industrial grade fibre optic assembly connects the control unit to the flow-cell.

Turbidity is a measure of the lack of clarity or “cloudiness” of a fluid caused by undissolved particles. Turbidity is an optical property that causes light to be scattered and absorbed rather than transmitted in straight lines through the sample.

As light passes through a sample containing suspended solids, the particles absorb the light energy and re-radiate the energy in all directions. Particle shape, size, color and refractive index determine the spatial distribution of the scattered light by the particle. Particles smaller than the wavelength of light (e.g. bacteria) scatter light in equal intensities in all directions, while particles larger than the wavelength of light result in a greater forward scattering.

As the light scattered in the forward direction is variable depending upon the particle size, the measurement of light transmitted through the sample will yield variable results. This problem is eliminated when turbidity is measured at right angles to the incident light beam - an angle considered to be very sensitive to light scatter by particles in the sample. Both the International Standard (ISO7027:1999(E)) and North American EPA Method (1801.1) defining the measurement of turbidity requires scattered light measurement at 90°.

Modern turbidimeters use a technique called nephelometry, which measures the amount of light scattered at right angles to an incident light beam. The Kemtrak TC007 turbidimeter complies to International Standard ISO7027:1999(E), a European standard primarily defining the allowable turbidity in drinking water.

Both transmitted light and scattered light at 90° is measured and mathematically combined using a ratio algorithm to calculate the turbidity of the sample. The dual detection system and ratio algorithm provides a turbidity measurement that has significantly better performance with colored and/or light absorbing samples.

A 880nm long life LED light source is used to provide reliable turbidity measurements from 1 to well over 10000 NTU depending upon the configuration of the optical flowcell or probe. The Kemtrak TC007 is an instrument of high accuracy with long-term calibration stability.