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SPECIFICATION
Specification
General
Sensor range
(Based on potassium hydrogen phthalate calibration standards)
AV410/411
Low range 0 to 20mgl
AV420/422
High range 0 to 100mgl
Linearity
Low range
±2% of reading or 0.15mgl
whichever is the greater
High range
±2% of reading or 0.5mgl
whichever is the greater
Reproducibility
Low range
±0.15mgl
–1
–1
High range
±0.5mgl
Inferred units
Absorbance units/metre
Color (°H)
–1
Coagulant dose (mgl
)
–1
TOC (mgl
)
User Defined
Maximum current output scale expansion
–1
Low range
0 to 2mgl
High range
0 to 20mgl
Response time
Normally three minutes for 90% step change depending on
damping factor
Lamp life
Rated by the manufacturer at 1.2 x 10
(10 years continuous operation at the rate of one flash at 2s
intervals [typical] equates to 13.1% of the rated lamp life)
Internal wiper cleaning system
Programmable, operation frequency 15, 30, 45 and
60 minutes 2, 4, 6, 12 and 24 hours
Maximum distance between transmitter and sensor
750mm (29.5 in.)
Sample
Flow rate
–1
0.5 to 5l min
(free of air bubbles).
A higher flow rate is required at high turbidity levels
Temperature
0 to 40°C (32 to 104°F)
Pressure
The sensor should be operated at atmospheric pressure but can
withstand 3bar (43.4 psi) max.
58
–1
C
–1
C
–1
C
–1
C
C
C
C
–1
C
9
flashes
Display
Type
1
Dual 4
/
-digit, 7-segment backlit LCD
2
Information
16-character, single line dot matrix
Resolution
–1
Low range
0.01mgl
–1
High range
0.1mgl
Energy saving function
Backlit LCD configurable as ON or Auto Off after 60 seconds
Logbook
Electronic record of major events and calibration data
Real-time clock
Records time for logbook and auto cleaning
Diagnostics
Out of sample
Lamp disabled
Loss of signal
Electronic failure
Languages
English
French
German
Italian
Spanish
Outputs
Current Outputs
Number of signals
2 fully isolated current outputs supplied as standard,
configurable to one or both sensor outputs
Current outputs also programmable to any value between
0 and 22mA to indicate system failure
Output current
0 to10mA, 0 to 20mA or 4 to 20mA
Maximum load resistance
750 at 20mA
Accuracy
±0.25% FSD ±5% of reading
Resolution
0.1% at 10mA, 0.05 at 20mA
Serial communication
PROFIBUS
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