Meets ISO 7027, DIN EN 27027, DIN 38404 and
NFT 9033
ASTM D7315 - Standard Test Method for
Determination of Turbidity Above 1 Turbidity Unit
(TU) in Static Mode
ASTM D6655 - Standard Test Method for
Determination of Turbidity Below 5 NTU in Static
Mode

Light source

Light-emitting diode (LED) at 860 ± 30 nm

Measurement modes

FNU and NTU

Range

FNU (manual range): 0–0.999, 0–9.99, 0–99.9, 0–
1000
FNU (auto range): 0–1000
NTU (manual range): 0–0.999, 0–9.99, 0–99.9, 0–
1000
NTU (auto range): 0–1000

Accuracy

±2% of reading plus 0.01 FNU/NTU from 0–
1000 FNU/NTU

Resolution

Turbidity: 0.001 FNU/NTU (on lowest range)

Specification

Details

Repeatability

±1% of reading or 0.01 FNU, whichever is greater
(under reference conditions)

Response time

Signal averaging off: 6.8 seconds
Signal averaging on: 14 seconds (when
10 measurements are used to calculate the average)

Stabilization time

Immediately

Reading modes

Manual or auto range, signal averaging on or off

Power requirement

115–230 VAC, 50/60 Hz (automatic power selection)
28 W maximum

Pollution
degree/installation
category

2; II

Protection Class

Operating conditions

Temperature: 0 to 40 °C (32 to 104 °F)
Relative humidity: 0–90% at 25 °C, 0–75% at 40 °C,
noncondensing
Altitude: 2000 m (6560 ft) maximum
Indoor use only

Storage conditions

–40 to 60 °C (–40 to 140 °F), instrument only

Interface

RS232C serial interface by way of DB9 subminiature
D-shell connector for data output to computer or
printer, and data input (command). No handshaking.

Air purge

Dry nitrogen or instrument grade air (ANSI MC 11.1,
1975)
0.1 scfm at 69 kPa (10 psig); 138 kPa (20 psig)
maximum
Hose barb connection for

-inch tubing

Sample cells

Round cells 95 x 25 mm (3.74 x 1 in.) borosilicate
glass with rubber-lined screw caps

Note: Smaller sample cells (less than 25 mm) can be used
when a cell adapter is used.

English 3