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Section 1 Specifications
Specifications are subject to change without notice.
Table 1 Turbidimeter Specifications
Method of Detection
Nephelometric light scatter at 90 degrees relative to the incident light beam. The incident light
beam is composed of a tungsten filament light source with a color temperature between 2200 and
3000K.
Range 0.001–100 nephelometric turbidity units (NTU)
Accuracy
± 2% of reading or ± 0.015 NTU (whichever is greater) from 0 to 40 NTU;
± 5% of reading from 40 to 100 NTU
Linearity
Better than 1% 0–40 NTU on formazin. Allows for accurate calibration at high turbidity values.
Temperature dependent ±2 °C.
Resolution (Displayed) 0.0001 NTU up to 9.9999 NTU; 0.001 NTU from 10.000 to 99.999 NTU
Repeatability Better than ±1.0% of reading or ±0.002 NTU, whichever is greater for each range.
Response Time
For a full-scale step change, initial response in 1 minute, 15 seconds. Varies with flow rate,
see the table below. The response time is also dependent on the signal averaging time, which is
user selectable.
Sample Flow Required 200 to 750 mL/minute (3.2 to 11.9 gal/hour)
Sensor Storage
Temperature
–20 to 60 °C (–4 to 140 °F); 95% relative humidity, non-condensing.
Operating Temperature 0 to 50 °C (32–122 °F) for single sensor system, 0 to 40 °C (32–104 °F) for two sensor system
Sample Temperature Range 0 to 50 °C (32–122 °F)
Operating Humidity 5 to 95% non-condensing
Power Requirements 12 V dc ±5%, 12.5 watts maximum
Sample Inlet Fitting ¼-inch NPT female. ¼-inch compression fitting (supplied)
Drain Fitting ½-inch NPT female, ½-inch hose barb (supplied)
Signal Average (Filter) Time no averaging, 6, 30, 60, and 90 seconds, user selectable. Default is 30 seconds.
Sensor Dimensions Turbidimeter body and cap: 25.4 x 30.5 x 40.6 cm (10 x 12 x 16 inches)
Sensor Cable Length 2 m (6.6 ft); Optional 7.62 m (25 ft) extension cable. Maximum cable length is 9.62 m (31.6 ft).
Sensor Cable Rating
Cable: 105 °C, 300 V, PVC jacket
Wires: 22 AWG, PVC jacket
Mounting Options Wall; floor stand
Shipping Weight 1720E Turbidimeter and Controller: 6.31 kg (13.5 lb); 1720E Turbidimeter only: 4.71 kg (10 lb)
% Step Change
Flow Rate
750 500 250
10 1¼ minutes 1½ minutes 2½ minutes
50 2 minutes 2½ minutes 6 minutes
90 3½ minutes 3½ minutes 9 minutes
99 4 minutes 5 minutes 12 minutes
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