Instrument Accuracy Specs: turbidity
Accuracy, range, and performance specifications for process measurement instruments. Covers pressure transmitters (standard, high-accuracy, economy), differential pressure transmitters, temperature transmitters (RTD, thermocouple), flow meters (magnetic, vortex, Coriolis, ultrasonic, turbine), level transmitters (radar, GWR, ultrasonic, DP), pH analyzers, conductivity analyzers, dissolved oxygen sensors (amperometric, optical), and turbidity meters. Each record includes accuracy (% span or % reading), repeatability, turndown ratio, response time, ambient/process temperature range, max pressure, output signal, SIL rating, and MTBF. 28 records from Emerson, E+H, Yokogawa, Siemens, and Hach instrument datasheets.
| instrument type | measurement principle | MTBF years (years) | SIL rating | accuracy absolute | accuracy absolute unit | ambient temp range C max (degC) | ambient temp range C min (degC) | max pressure psi (psi) | notes | output signal | process temp range C max (degC) | process temp range C min (degC) | range max | range min | range unit | repeatability pct (%) | response time s (s) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| turbidity | backscatter (high-range process) | 7 | SIL 1 | 5 | NTU | 60 | 5 | 145 | High-range turbidimeter (E+H Turbimax CUS52D / Hach Surface Scatter); for raw water and sludge; ±5% reading; requires frequent cleaning in high-solids applications | 4-20mA HART | 80 | 5 | 10,000 | 100 | NTU | 2 | 5 |
| turbidity | nephelometric 90 deg scatter (ISO 7027) | 7 | SIL 1 | 0.01 | NTU | 60 | 5 | 145 | Process turbidimeter (E+H Turbimax CUS51D / Hach 1720E / Yokogawa); ISO 7027 compliant; ±2% reading or 0.01 NTU (lower of two); for filter effluent and drinking water compliance | 4-20mA HART MODBUS | 60 | 5 | 4,000 | 0 | NTU | 1 | 5 |
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