Application:

Model A15/66 Sulfite Ion Monitor provides the solution to dechlorination control. The technology is based on the chemical fact that Sulfite and Chloride ions cannot coexist.   The system allows continuous measurement of sulfite residuals over ranges of either 0-2 or 0-20 PPM. An analog output from the monitor can be used for control of the chemical feed system to maintain a safe residual sulfite concentration while reducing chemical expense to a minimum.

Features and Benefits:

• Direct Sulfite Measurement – Sulfite ion is measured selectively by conversion to sulfur dioxide.
• Alphanumeric LCD – Provides SO3 display, alarm status indication, and all configuration information.
• Two Control Relays – Relays are programmable for set point, dead band, and time delay. Relays offer pulse frequency and pulse width modulation control modes in addition to simple on/off control for direct chemical feed pump modulation.
• Isolated Output – Programmable 4-20 mA output span from 0 - 0.2 PPM to 0 - 20.00 PPM full scale. Output may also be inverted if required.
• Automatic Cleaning – Monitor provides system for controlling the automatic cleaning of sample inlet line to control fouling.
• Gas Phase Sensing – Measurement is made without contact between sample and sensor, eliminating the potential for sensor fouling.