Introduction
The document introduces the ATI B20 Residual Chlorine Recorder, which integrates both analyzer and recorder functions for chlorine residual monitoring. This system simplifies installation, operation, and reduces costs by using a direct measuring membraned sensor that requires minimal maintenance.

Key Features

• Records free or combined chlorine levels.
• Selectable chart options for 24-hour or 7-day recording.
• Modular sensor design for easy servicing.
• Digital concentration display.
• NEMA 3 rated enclosure for wall or panel mounting.
• Replaceable felt tip chart pens.
• No chemical reagents required.
• Simple constant-head flowcell design.
• Two standard alarms included.

Sensor and Flowcell
The B20 series uses a reliable polarographic membraned sensor, eliminating the need for chemical buffers. It is suitable for both free chlorine and combined chlorine monitoring. The system includes a constant-head flowcell assembly to maintain stable sample flow.

Specifications

• Measurement Range: 0-1 to 0-5 PPM or 0-5 to 0-20 PPM.
• Chart: 10" with 0-100% 24-hour scale.
• Accuracy: ±0.05 PPM; Repeatability: ±0.02 PPM.
• Response Time: 90% in 60 seconds.
• Enclosure: NEMA 3 Noryl with acrylic window.
• Sensor Materials: Noryl and stainless steel.
• Flowcell Materials: Clear acrylic with stainless plate.
• Sample Flowrate: 15 GPH (7 GPH minimum).
• Sample Temperature: 0° - 50° C.
• Power: 120 or 240 VAC, 50/60 Hz.
• Recorder Size: 14"W x 14"H x 6"D.
• Flowcell Size: 4.5"W x 7"H x 3.5"D.
• Alarms: Two programmable alarms with SPDT relays.

Suffix Options

• Measurement Type: Free Chlorine (62) or Chloramines (63).
• Amplifier Style: Internal (1) or External (2).
• Range: Standard (1) or High range (2).
• Sensor Style: Submersible (1) or with clear flowcell (2).

Additional Options

• Junction box, sensor cables, submersion sensor bracket, CO2 buffer system, rotameter, pens, and charts.