Instrument Accuracy Specs: pH_analyzer
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) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| pH_analyzer | differential pH electrode | 7 | SIL 1 | 0.01 | pH | 60 | 0 | 145 | Differential (3-electrode) type (Rosemount 399 / Yokogawa); ±0.01 pH; reduced reference poisoning; for difficult processes with coating/fouling | 4-20mA HART | 100 | 0 | 14 | -2 | pH | 0.005 | 10 |
| pH_analyzer | glass electrode / reference electrode | 5 | SIL 1 | 0.02 | pH | 60 | 0 | 580 | Industrial pH (E+H Orbisint CPS11 / Yokogawa PH8EFP); ±0.02 pH accuracy; ±0.01 pH repeatability; temperature compensated; requires daily-weekly calibration; electrode fouling degrades accuracy | 4-20mA HART MODBUS | 80 | 0 | 14 | -2 | pH | 0.01 | 10 |
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