Low-level conductivity measurements are essential for monitoring a variety of high purity water systems. The proper operation of deionizers, reverse osmosis membranes, ion exchange systems, and heat exchangers require constant monitoring to ensure high quality production.

ATI’s Model Q45C2 Conductivity Monitor provides the reliable and accurate low-level measurements required for such high purity water systems. Monitors provide large, easyto-read LCD displays 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 Meg-ohm units instead of microSiemens.

Monitors are available in a variety of configurations, including a loop-powered transmitter, an AC-powered analyzer with two 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 nonfouling 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.

Resistivity/Conductivity Monitors shall be supplied for continuous monitoring of conductivity in __________ (Specify Application and Location). The conductivity monitoring system shall consist of an electronic monitor housed in a NEMA 4X enclosure suitable for wall, pipe, or panel mounting, a 2-electrode style conductivity sensor, and accessories listed below. The Conductivity Monitoring System shall be ATI Series Q45C2/Q25C2 as described below.

The conductivity sensor shall be a two-electrode design capable of a measuring range of 0 to 20 or 0 to 200 microSiemens, depending on cell constant. The sensor electrodes shall be constructed of titanium or 316 stainless steel for optimum chemical resistance. O-ring seals shall be composed of Viton.

The sensor shall include a Pt1000 or Pt100 RTD for high accuracy temperature measurements.

The sensor shall be available in mounting styles that include sanitary, insertion, and submersion configurations.

The conductivity Monitor electronic assembly shall be: (select one version below)

A. A loop-powered 2-wire instrument providing an isolated 4-20 mA output proportional to conductivity into a maximum load of 500 ohms.

B. An AC powered instrument for operation on (specify either 115 VAC or 230 VAC) single-phase line power. The monitor shall provide two isolated 4-20 mA outputs configurable for conductivity or temperature. Analog outputs shall be both ground isolated and isolated from each other. AC powered conductivity monitors shall also contain two SPDT relays.

C. A battery operated data logging monitor capable of operating from an internal 9 VDC battery. The monitor shall provide two 0-2.5 VDC outputs suitable for use by the internal data logger. The monitor shall operate for up to 4 days continuously on an alkaline battery and up to 10 days on a lithium battery.

The conductivity monitor electronic assembly shall provide a variety of functions as follows.

1. Provide user selectable display of conductivity, TDS, or process temperature on the main display. Main display variable shall be indicated with a minimum character height of 0.75” to allow easy readability up to 20 feet away. The transmitter shall include functions for displaying concentration values from built-in tables.

2. When operated on AC power, provide two isolated 4-20 mA outputs, with output spans programmable by the user for any segment of a display range.

3. The transmitter shall allow the 4-20 mA output to be set to any two points within the measuring span of 0-2,000,000 μS, as long as the points are at least 20 μS away from each other. The points may also be reversed. The transmitter shall allow the user to place a delay on the reaction time of the output and display.

4. Provide output hold and output simulate functions to allow for testing or remote receiving devices or to allow maintenance without disturbing control systems.

5. When operated on AC power, provide two SPDT relays. Relays shall be programmable for either control or alarm function, or relays may be assigned to diagnostic functions for use in indicating trouble conditions at a remote location.

6. The transmitter shall contain calibration functions for 1-point calibration for conductivity. An air-zero calibration routine shall be provided for calibrating the sensor zero point at initial installation. Calibration stability monitors shall be provided to hold calibration status until stable calibration conditions have occurred. In addition, the transmitter shall allow a sensor cell constant value to be entered directly for calibration without solutions.

7. Diagnostic functions shall be incorporated into the transmitter. The 4-20 mA output shall be capable of being assigned to safely rise to 20 mA, fall to 4 mA, or be left alone, during diagnostic failures. Diagnostic error messages shall be displayed in clear language; no confusing error codes shall be displayed.

8. When operated from a 9 VDC battery, provide data logging of conductivity and temperature over programmable time intervals. Provide software with the data logger for easy data download to standard computers, with graphical and tabular viewing of data. Software shall allow export of data to standard spreadsheet programs

The complete Conductivity Monitor shall be an Analytical Technology Inc. Model Q45C2/Q25C2, or approved equivalent.