The Q45C2 Conductivity monitor provides the reliable and accurate low level measurements required for such high purity water systems. Monitors provide large, easy to read LCD display with a second display line for indication of temperature or other operational information. And for those applications where results in resistivity units are preferred, Q45C2 monitors can be programmed to display readings in Med-ohm instead of microSiemens.

Monitors are available in a variety of configurations, including a loop powered transmitter, an AC powered monitor with tow user programmable alarm functions and a battery operated unit, either with or without an internal data logger.

The monitor employs 2 electrode conductivity sensors with low cell constants to provide continuous measurements from 0-20 to 0-2,000 microSiemens. The 2 electrode sensors are specifically designed for use in ultra pure water and non fouling applications. The sensors are available in several mounting configurations including 316Ss compression fittings or sanitary style. These sensors may also be mounted submersion style or in a hot tap configuration.

For almost any high purity conductivity application, the Q45C2 system will provide the reliability, ease of use and flexibility you are looking for.

Sensor Cell Constants

2 electrode conductivity sensors are classified by "cell constant" or "K". The K valve for a specific sensor relates to the electrode geometry. A sensor with a low K value is designed to provide high accuracy in low conductivity waters. However, the low K sensor is a poor choice3 for use in higher conductivity waters, as the response to changing conductivity becomes non linear. A sensor with a higher K value, on the other hand, provides better accuracy in higher conductivity waters, but performs poorly in low conductivity waters. ATI's Q45C2 system offers three sensors for use in the indicated conductivity ranges.

• 0.05K: 0-2.000, 0-20.00 uS, 0-20.00 Momega or 0-200.00 komega
• 0.50 K: 0-20.00 or 0-200.0 uS
• 1.00 K: 0-2,000 uS

Sensor Mounting

The 2 electrode conductivity sensors are designed for direct installation into piping systems. It is important to install the sensors such that the electrodes are free of obstructions. For example, when suspended solids or air bubbles are present, improper installation can result in erroneous readings and increased maintenance

The sensor should be installed horizontally with the electrodes directed into the on coming flow of water. This prevents air bubbles and particulates from collecting in the space between the two electrodes. Any obstruction between the electrodes may cause the conductivity reading to either increase or decrease, depending on the nature of the obstruction.

Features

Multiple Configurations: The Q45C2 monitor can be configured to measure and display Resistivity, Conductivity or Total Dissolved Solids (TDS). The TDS factor is also user selectable.

Loop-powered, AC or Battery Versions: This line of microprocessor based instrumentation allows for easy implementation of loop-powered or battery-powered capability within the same instrument. This instrument can be rapidly converted between any of these versions with no requirements for software change.

Large, Dual line Display: The large, high contrast, super twist display provides excellent readability over a wide temperature range, even in low light conditions. The main display line consists of large, segmented characters with measurements unit. The secondary display line utilizes easily readable dot matrix characters for clear display of calibration and diagnostic messages. Two or dour measured parameters may be display simultaneously.

Intuitive User Interface: Four button programming provides intuitive navigation through the menu driven user interface.

Dual Alarm Relays/Analog Outputs: AC operated systems provide two relays that are configurable for either "control mode" or "alarm mode" of operation. Outputs are assignable to either conductivity or temperature.

Flexible Calibration: Two point and sample calibration options include stability monitors to check temperature and main parameter stability before accepting data.