Sigrist-Photometer GmbH
About
Sigrist-Photometer AG, founded in 1946 by Dr. Ing. Willy Sigrist in Ennetbürgen, Switzerland, develops and manufactures high-precision process photometers and turbidity measuring instruments entirely in-house under the Swiss Made label. Sigrist pioneered flicker mirror dual-beam photometry — using a reference beam for long-term stability — a principle that still underpins the company's instruments. The AquaScat family of online turbidimeters forms the product line's core: the AquaScat 2 WTM achieves 0.001 FNU resolution using a contact-free free-fall flow cell that eliminates window fouling for drinking water monitoring per ISO 7027, while the AquaScat S provides in-line measurement directly in the water stream with zero water loss, the AquaScat 2 HT serves high-turbidity and high-temperature applications, and the AquaScat 2 P handles pressurized measurement in gaseous water. The AquaMaster multi-parameter station combines turbidity with pH, conductivity, redox, dissolved oxygen, and temperature sensors on a single pre-mounted unit. The ColorPlus line delivers inline UV absorbance measurement at 254 nm (SAC 254) for monitoring micropollutant elimination in ozone and wastewater reuse processes, with the ColorPlus 3 Nitrate adding inline nitrate measurement. The LabScat 2 provides two-angle laboratory turbidity measurement (0–500 EBC) with bottle rotation for window-deposit compensation. Complementary instruments include the OilGuard series for oil-in-water detection, TurBiScat and DualScat for brewing process turbidity monitoring (MEBAK/EBC compliant), PhaseGuard for phase separation, FireGuard 2 for tunnel smoke detection with 210 units operating in the Gotthard tunnel since 2007, and ScrubberGuard for gas scrubber monitoring. Control units range from the SiDis AD 40 single-instrument display to the SiCon PM 40 supporting up to eight sensors with a 370-day data logger.
Key Products
Online turbidimeter for drinking water using contact-free free-fall flow cell measurement with resolution down to 0.001 FNU, compliant with ISO 7027.
In-line turbidity and temperature measurement sensor that operates directly in the water process with zero water loss and minimal maintenance.
High-temperature variant of the AquaScat turbidity meter for process conditions requiring elevated temperature tolerance.
Compact turbidity meter variant in the AquaScat family for drinking water quality monitoring.
Multi-parameter measuring station combining turbidity, pH, conductivity, redox, dissolved oxygen, and temperature sensors with AquaScat touchscreen controller for water treatment works.
Inline UV absorbance meter at 254 nm (SAC 254) for monitoring micropollutant elimination performance in drinking water and wastewater reuse applications, with automatic cleaning cycle.
Advanced inline UV absorbance measurement at 254 nm for water quality monitoring with enhanced features over the ColorPlus 2.
Inline nitrate measurement instrument for real-time water quality monitoring in treatment processes.
Two-angle laboratory turbidity meter with 0-500 EBC measuring range for final quality assurance in the lab, using bottle rotation to compensate for window deposits.
Oil-in-water detection instrument using photometric measurement for monitoring hydrocarbon concentrations in water.
In-line process turbidity meter for breweries combining two-angle scattered light measurement with optional color measurement, MEBAK/EBC compliant.
Compact turbidity meter for brewery filtration measuring transmitted light, 90-degree scattered light, and 25-degree forward scattered light simultaneously.
Application-specific photometric device for monitoring phase separation in brewing and industrial processes.
Application-specific turbidity monitoring device for brewing and industrial process control.
Optical smoke detection system for road tunnels providing early warning of smoke events.
Monitoring instrument for gas scrubber systems measuring turbidity and clarity in scrubber liquid circuits.
Control and display units (Standard, Advanced, Premium) for connecting and operating Sigrist photometers with data logging and host system connectivity.
Display unit for operating and displaying data from individual Sigrist photometers.
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