Specification - ABB 4690 User Manual

4690 Series
Turbidity systems

11 Specification

Sensor
Range
Low range 0 to 40 NTU
High range 0 to 400 NTU
Measurement principle
90 ° scattered light measurement.
Compliant to EPA 180.1 or ISO7027
Maximum linearity
Typically <1.0 %
1, 2
Accuracy
Low range version ±2 % of reading
High range version ±5 % of reading or 0.3 NTU
3
Repeatability
0 to 200 NTU <1 %
200 to 400 NTU 2 %
4
Limit of Detection
Low range version: 0.003 NTU
High range version: 0.3 NTU
Response time
-1
T90 < 1 min at 1 l/min
Flow rate
0.5 to 1.5 l/min (0.13 to 0.39 gall [US]/min)
Integral wiper cleaning system
Programmable operational frequency every 0.25 hour, 0.5 hour,
0.75 hour or multiples of 1 hour up to 24 hours
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.
IM/4690–EN Rev. A
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

Teflon
Wiper unit

Black Polycarbonate, 10% Glass Fibre 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
11 Specification
37