Q40CT Blind Toroidal Conductivity Transmitter

Blind Transmitter for OEM Applications

General Details
ATI’s Model Q40CT Blind Toroidal Conductivity system is designed for on-line water quality monitoring of chemically aggressive process solutions. This blind, analog version is ideally suited for applications where reliable instrumentation is critical and economy of installation is essential.

The 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. For larger pipe diameters, the sensor can be insertion mounted through a 1-1/2″ NPT ball valve for easy retraction.

The Q40CT toroidal conductivity water quality monitor is easy to operate, requires minimal maintenance and is economical to own, yet provides reliable measurement of your chemical process.


Concentration version for direct display of chemical concentrations.

Extra Outputs
Expansion board to add a third 4-20 mA analog output or to add three additional non-isolated low power relays.

Wide range capability, with selectable ranges of 0-200.0 uS up to 0-2.000 S provide maximum application flexibility.

AC or DC Power Options
Power options include universal 100-240 VAC +/- 10%, or 12-24 VDC.

Programmable range options from 0-200 PPB up to 0-200 PPM provide maximum application flexibility.

AC or DC Power Options
Power options include universal 90-260 VAC or 12-24 VDC.

Analog Output Options
Two isolated 4-20 mA outputs are standard, with an option for a third output if required. Default setting provides analog outputs for conductivity and temperature.

PID Output
Standard PID control function assignable to one analog output.

Digital Communications
Available in either Profibus-DP, Modbus-RTU or Ethernet-IP.

Relay Assignable
Three SPDT relays are standard, with relay functions programmable for alarm, control, or trouble indication. Three additional low power relays available as an option.

Flexible Mounting
NEMA 4X (IP-66) enclosure is suitable for wall, pipe, or panel mounting.

Clear Display
Back-lit large LCD display provides clear visibility in any lighting conditions. A scrolling second line on the display provides additional information and programming prompts.