ATI’s Model Q45CT toroidal conductivity system is designed for online monitoring of chemically aggressive process solutions. This sensor consists of two metallic ribbon coils that are fixed in place by the sensor jacket material. The drive coil is used to induce a current in the process solution. The second sensing coil is used to measure the current in the process solution, the magnitude of this current is proportional to the conductivity of the process solution.

Toroidal sensors are available in polypropylene and PEEK to ensure sensor wetted materials are chemically resistant to process chemicals. Sensor material is also non-conductive, thereby isolating the sensor from electrical noise and ground loops that can influence the integrity of the measurement. This material also makes the sensor resistant to electrode coating, as most substances do not adhere to the sensor material.

Sensors can be submersion-mounted for easy installation in open tanks or pipe-mounted in the optional 2" tee fitting, which is keyed to the sensor for proper alignment. Tee fitting material is either polypropylene or 316 stainless steel.

The Q45CT is also available as a Concentration Monitor. The monitor comes with concentration/temperature tables for sodium hydroxide, potassium hydroxide, hydrochloric acid, nitric acid, and sulfuric acid. A user configurable table is also available for entering data points for a custom concentration curve.

The ATI Model Q45CT toroidal conductivity system is well suited for aggressive chemical processes, water application that coat or foul traditional sensors, and plating bath operations where high current densities are present.  The toroidal sensor is also referred to as an electrodeless conductivity sensor, or a 0E conductivity sensor.

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 toroidal style conductivity sensor, and accessories listed below. The Conductivity Monitoring System shall be ATI Series Q45CT as described below.

The conductivity sensor shall be a toroidal design. The sensor jacket material shall be either PEEK (poly-ether-ether-ketone) or polypropylene. The body shall have a 3/4" MNPT thread on the cable end for mounting to submersion-mount hardware. The sensor cable shall be fixed to the sensor and encapsulated in the sensor body. The sensor shall include a Pt1000 RTD for high accuracy temperature measurements.

An optional 2" tee fitting shall be available. The tee fitting material shall be either polypropylene or 316 stainless steel. The tee fitting shall be keyed to the sensor to ensure proper sensor alignment.

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 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.

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. The transmitter shall be configurable as a concentration monitor, which include functions for displaying concentration values from built-in tables. A user configurable table shall be available for entering data points for a custom concentration curve.

9. 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 Q45CT, or approved equivalent.