Chlorine dioxide is a neutral chlorine compound. It is very different from elementary chlorine, both in its chemical structure (ClO2) and in its behavior. One of the most important qualities of chlorine dioxide is its high water solubility, especially in cold water.
Chlorine dioxide does not hydrolyze when it enters water; it remains a dissolved gas in solution. Chlorine dioxide is approximately 10 times more soluble in water than chlorine. It is not affected by pH and has an excellent residual effect remaining active for hours to days. It does not interact with ammonia or ammonium. It is effective in cold temperatures.
Testomat 2000 CIO2 – Online Photometer for Chlorine Dioxide Monitoring Precise CIO2 measurement for water quality and process safety with Heyl technology The Testomat 2000 CIO2 is an online photometer for continuous monitoring of chlorine dioxide (CIO2) levels in water. It delivers reliable measurements up to approx. 4.7 mg/L within just a few minutes of reaction time. In a photometric process, two reagents are automatically dosed, and a precise concentration measurement is performed in a short reaction time. Results are available after approximately one minute. Two independently programmable limit contacts with adjustable hysteresis enable direct process monitoring and control, for example to trigger alarms or switch external devices. The piston dosing pump and internal diagnostic functions ensure high measurement accuracy. Technical Features of the Testomat 2000 CIO2 With a plain-text menu interface, programmable measurement intervals, and multiple freely adjustable limit contacts, the device provides a precise, stable, and versatile solution for continuous CIO2 (chlorine dioxide) monitoring. Additional functions such as external analysis triggering, quantity-dependent measurement, and internal diagnostics extend usability for complex process environments. Applications Drinking water supply Process water and industrial applications Swimming pools Food and beverage industry Performance Profile of the Testomat 2000 for Chlorine Dioxide Measurement Analysis via automatic dosing of 2 reagents Measurement result displayed after approx. 1 minute reaction time 2 independently programmable limit contacts for monitoring and control tasks; measurement recording with optional plug-in card (SK910 current interface) for a point or chart recorder (0/4–20 mA) or SD-card data logger Menu-guided operation and programming via plain-text display High measurement accuracy thanks to precise piston dosing pump Analysis triggering: Automatic interval mode (interval pause adjustable from 0–99 minutes) External triggering Dynamic (exhaustion-dependent interval mode) Quantity-dependent via contact water meter Two independent limits with hysteresis (1, 2, or 3 bad analyses) and adjustable switching functions Monitoring of two measurement points (switching via external solenoid valves) Internal error documentation Programmable service address Programmable maintenance interval for maintenance requests