TriOS

TriOS TW Series Water Sensors

TriOS TW series sensors measure pH, conductivity and temperature (TW pH/EC) and turbidity by nephelometry (TW Turb-40, TW Turb-W40) in drinking water monitoring.

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Technical specifications

Measured parameters (TW pH/EC)	pH, electrical conductivity (EC), temperature
pH measuring range and accuracy	0-14 pH, ± 0.06 pH accuracy
Conductivity measuring range and accuracy	0-5000 µS/cm; ± 40 µS/cm at 1000 µS/cm and ± 200 µS/cm at 5000 µS/cm (DIN EN 27888:1993)
Temperature measurement and compensation	0-65 °C, compensation with a Pt1000 temperature sensor
Response time (T90)	15 s (rising), 20 s (falling)
Warm-up time	< 5 minutes
Internal data storage	8 GB internal data logger
Measuring principle (TW Turb)	Nephelometry (90° scattering angle)
TW Turb-40	860 nm LED light source, ISO 7027, 0-40 FNU, ± (5 % + 0.01) FNU accuracy
TW Turb-W40	White light LED, EPA 180.1, 0-40 NTU, ± (5 % + 0.05) NTU accuracy

TriOS TW series water sensors measure pH, electrical conductivity, temperature and turbidity for drinking water monitoring. The series consists of the TW pH/EC combined sensor (0-14 pH, 0-5000 µS/cm, 0-65 °C, with an 8 GB data logger) and the TW Turb-40 and TW Turb-W40 turbidity sensors (0-40 FNU to ISO 7027 at 860 nm, and 0-40 NTU to EPA 180.1 with white light). Mikron Proses (Üsküdar, Istanbul), TriOS’s solution partner in Turkey, provides application consulting on sensor selection, commissioning and calibration.

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Sensors for water quality monitoring

The TriOS TW series covers key water quality parameters in drinking water monitoring. The manual specifies the TW pH/EC sensor for drinking water, and the TW Turb sensors for drinking water, groundwater and surface water. The family has the TW pH/EC combined sensor, which measures pH, electrical conductivity and temperature together, and the TW Turb sensors for nephelometric turbidity measurement.

TW pH/EC combined sensor

TW pH/EC combines pH, conductivity and temperature in one housing. Conductivity is measured according to DIN EN 27888:1993, and an integrated Pt1000 sensor provides temperature compensation.

Measuring range and accuracy: ± 0.06 pH over 0-14 pH; ± 40 µS/cm at 1000 µS/cm and ± 200 µS/cm at 5000 µS/cm over 0-5000 µS/cm.
Response and warm-up: the T90 response time is 15 s in the rising direction and 20 s in the falling direction, and the device reaches stable measurement in less than 5 minutes.
Data storage: an 8 GB internal data logger stores measured values.

TW Turb turbidity sensors

The TW Turb sensors determine turbidity by nephelometry at a 90° scattering angle. Two models cover different standards:

TW Turb-40: an 860 nm LED light source and ISO 7027 measurement; 0-40 FNU range with ± (5 % + 0.01) FNU accuracy.
TW Turb-W40: a white light LED and US EPA 180.1 measurement; 0-40 NTU range with ± (5 % + 0.05) NTU accuracy.

For all analyzers, see online analyzers.

Applications

Monitoring of drinking water treatment plants and distribution networks
Groundwater monitoring
Surface water monitoring

Datasheets and manuals

Documents were last compared with the manufacturer's source on 2026-09-16.

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