Product Overview

The Chemitec S495 is an open amperometric sensor using a three-electrode PT-PT system for free chlorine measurement. It is designed for immediate installation and easy maintenance, largely due to the absence of moving mechanical parts. The sensor includes a programmable self-cleaning function for the electrodes and provides temperature-compensated chlorine and temperature measurements via its Modbus 485 RTU output. The design eliminates the need for spare parts, enhancing ease of use.

Key Benefits

• Uses a robust three-electrode measurement system.
• Features programmable self-cleaning of the electrodes.
• No moving mechanical parts or spare parts are needed.
• Provides integrated temperature compensation with Modbus 485 RTU output.
• Mechanical protection is rated at IP68.

Applications

• Swimming pools.
• Drinking water.
• Service and process waters.

Features & Construction

• Measurement System: Three-electrode ammeter.
• Materials: Probe body made of Ryton®, measuring stem made of glass, electrodes made of platinum, porous septum made of ceramic, and O-ring made of NBR.
• Process Connection: PG13,5.
• Cable: PUR 10m cable with an M12 4-poles male connector.
• Interfering Substances: CIO2 and O3.

Technical Specifications

Specification	Value
Measurement Range	0 - 10 ppm Cl₂
Measurement Error	+/- 10% of reading but not less than +/- 0.05 ppm
pH Range	pH 6 - 8
Operating Temperature	5 - 75 degrees C
Maximum Operating Pressure	6 bar
Operating Flow	30 - 70 l/h constant
Response Time (T90)	approx. 30 s
Length / Glass Stem Diameter	215 mm / 12 mm
Power Supply / Max. Absorption	9 - 36 Vdc / 500 mW

Installation & Maintenance

• Cleaning: Features automatic and programmable in-situ cleaning.
• First Stabilisation Time: Approximately 30 min (can be up to 2 days depending on water quality).