1.12 Turbidity (Codes -27 and -37)
T
he 56 instrument is available in single and dual turbidity configurations for the Clarity II
turbidimeter. It is intended for the determination of turbidity in filtered drinking water. The
other components of the Clarity II turbidimeter – sensor(s), debubbler/measuring chamber(s),
and cable for each sensor must be ordered separately or as a complete system with the 56.
The 56 turbidity instrument accepts inputs from both USEPA 180.1 and ISO 7027-
compliant sensors. Four fully programmable relays with timers are included.
Note: the 56 Turbidity must be used with Clarity II sensor, sensor cable and debubbler.
Performance Specifications - Analyzer
Units: Turbidity (NTU, FTU, or FNU); total suspended solids (mg/L, ppm, or no units)
Display resolution-turbidity: 4 digits; decimal point moves from x.xxx to xxx.x
Display resolution-TSS: 4 digits; decimal point moves from x.xxx to xxxx
Calibration methods: User-prepared standard, commercially prepared standard, or grab
sample. For total suspended solids user must provide a linear calibration equation.
Inputs: Choice of single or dual input, EPA 180.1 or ISO 7027 sensors.
Field wiring terminals: Removable terminal blocks for sensor connection.
Accuracy after calibration at 20.0 NTU:
0-1 NTU ±2% of reading or 0.015 NTU, whichever is greater. 0-20 NTU: ±2% of reading.
Description and Specifications 13
Instruction Manual Section 1: Description and Specifications
LIQ-MAN-56 April 2017
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