Emerson Rosemount 499ACL Chlorine Sensor

The Emerson 499ACL is an ion selective electrode from Rosemount that belongs to the amperometric sensor family and is used to measure free chlorine, total chlorine, and monochloramine in water. Here are its technical specifications:

Measurement range: 0 to 10 ppm (mg/L) as Cl₂, higher ranges available on request.

Response time: 22 seconds.

Electrode type: Chlorine.

Electrode membrane: Liquid-ion exchange.

pH range: 6 to 9.5 pH.

Operating temperature range: 32 to 131°F (0.0 to 55°C).

Operating pressure: 0 to 65 psig (101 to 549 kPa).

Sample type: Aqueous.

Configuration: Modular.

Appearance and mounting options: Flow-through.

Maximum diameter/width: 1 inch (25.4 mm).

Maximum length: 7.75 inches (197 mm).

Different 499ACL models differ in the substances they measure:

499ACL-01: Measures free chlorine without sample pretreatment and with automatic pH correction to at least 9.5.

499ACL-02: Measures total chlorine when used with a reagent-based TCL-type sample conditioning system.

499ACL-03: Measures monochloramine without reagents or sample pretreatment.

Features of the sensor include the absence of cumbersome and expensive reagents, easy diaphragm replacement without special tools, automatic compensation for temperature-related membrane permeability changes, and the Vario Pol connector option that allows sensor replacement without replacing a new cable.