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To order this complete analyzer, please call our sales office at
(800) 242-7353

Send me more information about the Turbidity Analyzers 4670 and 4675.

µAI 4670 and µAI 4675

Turbidity Analyzer

THIS PRODUCT IS DISCONTINUED.

A Waltron Turbidity system is comprised of a 4670 wallmounted or 4675 panel-mounted analyzer, together with one of four sensors Model 7997-201 to 7997-401 .

The sensors are available in flow and dip versions. Where appropriate they are supplied with auto-cleaning to minimize maintenance on more turbid samples.

FEATURES		BENEFITS

Sensing System Flexibility		Operator can choose four sensor cell systems utilizing flowthru or dip configurations for a wide range of applications.



Comprehensive Self-Diagnostics		Ensures measurement accuracy by automatically checking sensor performance and ensuring that the light source is operating within the specification.



Ultra-Low Back Scatter		Enables true zero setting to ensure accurate and reliable results below 0.1 NTU.



Dry Secondary Calibration Standard		Simplifies accurate and repeatable calibration and eliminates the need and cost of chemical standards.



Auto-Cleaning Systems		Maintains superb performance and reduces maintenance by a programmable wiper cleaning system.



Lifetime Zero		Ensures high accuracy, minimum maintenance and long-term performance.



Wide Analysis Range		Programmed to read out in either NTU or FTU from 0-5 NTU to 0-1000 FTU. Ideal for applications varying from final treatment of potable water to effluent discharge monitoring.



Advanced Photodiode Technology		Extremely low noise signal enabling high accuracy and resolution to 0.01 NTU. Essential for accurate results below 1.0 NTU.

SENSOR SELECTION GUIDE

Specisifcations	7997-211 Turbidity Sensor	7997-201 Turbidity Sensor	7997-301 Turbidity Sensor



Range:	Programmable 0 - 1NTU to 0 - 30 NTU	Programmable 0 - 50 NTU to 0 - 250 NTU	Programmable 0 - 100 FTU to 0 - 500 FTU and 0 to 1000 mg/I (or ppm)



Principle:	90° scattered light measurement. Compliant to IS07027	90° scattered light measurement. Compliant to IS07027	Transmitted light



Characteristic:	Linear based on Formazine	Linear based on Formazine	Logarithmic based on Formazine



Resolution:	0.01 NTU	0.1 NTU	1 FTU Repeatability Better than 1 % of span



Repeatability:	Better than 1 % of span	Better than I % of span	Better than I % of span



Accuracy:	±2% FSD	±2% FSD	±2% FSD



Temperature Drift:	0.005 NTU/10° C	0.005 NTU/10° C	0.2 FTU/° C



Response Time:	varies with flow rate, typically 90% step change in less than 45s at 1 l/min	Varies with flow rate, typically 90% step change in 2 minutes at 1 l/min	Varies with flow rate, typically 90% step change in 2 minutes at 1 l/min



Flow Rate:	0.5 I to 1. 5 l/min	0.5 I to 1.5 l/min	0.5 I to 1.5 l/mm



Sample Operating Temperature:	0 to 50° C	0 to 50°C	0 to 50°C



Sample Pressure:	Up to 3 bar	Up to 3 bar	Up to 3 bar



Integral Wiper Cleaning System:		AutoCleaning Programmable operational frequency every 0.25 hour, 0.5 hour, 0.75 hour or mulitples of 1 hour up to 24 hours	AutoCleaning Programmable operational frequency every 0.25 hour, 0.5 hour, 0.75 hour or mulitples of 1 hour up to 24 hours



Applications:	Best suited for final treated potable and filtered water.	Best suited for raw water on potable water treatment plants. Includes auto-deaning.	Best suited for effluent discharge monitoring, water intakes and flier backwash. Includes auto-cleaning.



	7997-401 Best suited for open channels and tanks and effluent discharge monitoring. Includes auto-cleaning.

GENERAL SPECIFICATIONS

DISPLAY
Measured value:
5-digit x 7-segment backlit LCD

Information:
16-character, single line, dot matrix, backlit LCD

Ranges:
Used with 7997-10 1 0 - Z to 0 - 30 NTU
Used with 7997-201 0 - 50 to 0 - 250 NTU
Used with 7997-301 0 - 100 to 0 - 500 FLU and 0 - 1000 mg/I
Used with 7997-401 0 - 100 to O - 1000 FTU and 0 - 2000 mg/l

Units of measurement:
NTU and FTU all models mg/l on models 7997-301 and 7997-401

Accuracy:
=0.2% F.s.d., ±1 digit

Linearity:
t0.1 % f.s.d.

Auto-clean timing:
Programmable 15 min, 30 min, 45 min or 1 hour up to 24 hours in I hour increment

ENVIRONMENTAL DATA
Operating temperature limits:
200 to 550 C (-4° to 131 0 F)

Storage temperature limits:
250 to 55° C (-130 to 131 ° F)

Operating humidity limits:
Up to 95% RH non-condensing

POWER SUPPLY
Voltage requirements:
100 to 130V, 200 to 260V, 50/60Fiz

Power consumption:
<bVA a.c.

Error due to power supply variation:
Less than 0.1 % for +6% to -20% variation from nominal supply

Insulation:
Line to ground 2kV r.m.s.

RELAY OUTPUTS AND SET POINTS
No. of relays:
Two

Relay contacts:
Single pole changeover
Rating 250V a.c., 250V d.c. max.
3Aa.c. 3Ad.c. max.
Loading (non-inductive) 750VA 30W max.
(inductive) 750VA 3W max.

Insulation:
2kV r.m.s. contacts ground

No. of set points:
Two

Set point adjustment:
Programmable

Set point hysteresis:
-1 % fixed

Local set point annunciation:
Red L. E. D.

RETRANSMISSION
No. of retransmission signals:
One fully isolated programmable 0 - 1 OmA, 0 - 20mA or 4 - 20mA

Accuracy:
10.25% f.s.d. -0.5% reading

Resolution:
0.1 % at I OmA, 0.05% at 20mA
Max. load resistance 75052 (20mA max.)

MECHANICAL DATA
	Model 4670	Model 4675
Mounting	wall mounting	panel mounting
Protection	IP65	IP66 front
Weight	4.5Ibs	3.25Ibs
Dimensions	(6.30 in) wide	(3.78 in) wide
	(8.43 in) high	(3.78 in) high
	(2.68 in/ deep	(7.52 in) deep