4690 SERIES | TURBIDITY SENSOR | OI/ATS410-EN REV. A
15
8 Specifications
Sensor
Range
Low range 0 to 40 NTU
High range 0 to 400 NTU
Measurement principle
90° scattered light measurement
Compliant to ISO 7027
Maximum linearity
Typically <1.0 %
Accuracy
1, 2
Low range version ±2 % of reading
High range version ±5 % of reading or 0.3 NTU
Repeatability
3
0 to 200 NTU <1 %
200 to 400 NTU 2 %
Limit of Detection
4
Low range version: 0.003 NTU
High range version: 0.3 NTU
Response time
T90 < 1 min at 1 L/min
Flow rate
0.5 to 1.5 L/min (0.13 to 0.39 galUS/min)
Integral wiper cleaning system
Programmable operational frequency every 0.25 h, 0.5 h,
0.75 h or multiples of 1 h up to 24 h
Sample operating temperature
0 to 50 °C (32 to 122 °F)
Sample pressure
Up to 3 bar (43.5 psi)
Ambient operating temperature
0 to 50 °C (32 to 122 °F)
Ambient operating humidity
Up to 95 % RH
1 Maximum measured error across full measurement range (limited by
uncertainty in Formazine standards).
2 Tested in accordance with IEC 61298 Parts 1-4: Edition 2.0 2008-10.
3 Tested in accordance with MCERTS: Performance Standards and Test
Procedures for Continuous Water Monitoring Equipment. Version 3.1:
Environment Agency 2010.
4 Tested in accordance with BS ISO 15839: 2003.
Wetted parts – materials used
Cell body unit
• Black POM (polyoxymethylene) copolymer
• Spectrosil 2000 fused silica
• Nitrile (O-ring)
• Epoxy preform (cured) – Uni-forms 5034-00
• Polyamide 6
• Nickel-plated brass
• PTFE
Wiper unit
• Black polycarbonate, 10% glass-fiber filled – Lexan 500R
• Stainless steel (SS 316 S13/S11) w/ chemical black –
MIL-C13924 class 4
• Silicone grease (WRC-approved) – Unisilkon L 250 L
• 2-part epoxy adhesive (cured) – Robnor PX800F/NC
• EPDM (ethylene propylene diene monomer) black
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