- Aeration Air Flow Control
- Alarm Monitoring and Auto Dialer
- Chemical Dosing System (Liquid)
- Chemical Storage + Transfer
- Chlorination/Dechlorination System
- Dry Polymer
- Fixed Gas Detection and Control
- Flow Measurement
- FRP Shelters
- Gas & Flame Detection
- Gas Feed System
- Iris Valve
- Odor Control Monitor
- Odor Control Valve
- Polymer Makeup
- Portable Gas Detection
- Remote Data Management
- Water & Wastewater Process Monitors and Sensors
- Water Filteration
Residual Sulfite Monitor
Q46S/66 Residual Sulfite Monitor
Because measuring the SO3= ion in solution is relatively difficult, the Q46S/66 Monitor takes a different approach to the measurement, employing a unique gas-phase method to continuously monitor sulfide without contact between the sensor and the water sample. In operation, a small amount of sample is pumped into the system and mixed with acid. In acidic solution, the sulfite ion is converted to sulfur dioxide gas as follows:
SO3= + 2H+ SO2 + H20
The mixed sample flows into a special chamber where the
sulfur dioxide is stripped from the sample. A gas conditioning module prepares the gas sample for measurement prior to contact with a special SO2 gas sensor designed for the system. Sensor signals are amplified and displayed on a large-format, backlit LCD display in the Q46S electronics unit.
Sulfite ion is measured selectively by conversion to sulfur dioxide.
Gas Phase Sensing
Measurement is made without contact between sample and sensor, eliminating the potential for sensor fouling.
Chemistry Module Power Options
Power options include 115 or 230 VAC, 50/60 Hz.
Three Control Relays
Relays are programmable for setpoint, deadband, and time delay.
Sample Line Cleaning
Internal sequencing and relay system for automated sample line cleaning.
Communication options for Profibus-DP, Modbus-RTU, or Ethernet-IP.