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Q46CT Toroidal Conductivity Monitor

For pricing, please call AFC International at 1-800-952-3293, 219-987-6825 or fax 219-987-6826 or email



ATI’s Model Q46CT Toroidal conductivity monitor 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 establishes a strong magnetic field around the sensor body which induces a current in the process solution. The sensing coil is used to measure the induced current in the process solution. The magnitude of this current proportional to the conductivity of the process solution.

Conductivity measurement in aggressive chemical solutions or in water systems containing large amounts of solids, oil, and greases is very maintenance intensive using conventional 2 or 4 electrode sensors. ATI’s Model Q46CT Toroidal Conductivity Monitor employs an inductive (toroidal) sensor that allows measurement in corrosive samples with virtually no maintenance.

Toroidal conductivity Monitoring Systems contain a variety of features and options to meet virtually any conductivity monitoring and control application. While not suitable for low level conductivity measurement, toroidal monitors are and excellent choice for high conductivity applications. ATI’s Q46 platform represents the latest generation of monitoring and control systems. Control features have been expanded to include an optional 3rd analog output or an additional bank of low power relays. Digital communication options now include Profibus DP, Modbus RTU or Ethernet-IP variations.

The toroidal sensor is available in Noryl to ensure sensor wetted materials are chemically resistant to both strong acids and strong bases. 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 using the ¾” NPT pipe thread at the back of the sensor for easy installation in open tanks. The sensor may also be pipe-mounted using the special 2″ CPVC tee fitting which has an alignment key to automatically orient the sensor to the sample flow.

A Pt1000 RTD in the sensor body provides temperature input for both display and automatic temperature compensation of the conductivity measurement.

Conductivity monitors can be used to monitor and display concentration or acids or bases used in various chemical process applications. The Q46CT is available with pre-loaded tables allowing direct display of concentration for solutions or sodium chloride (NaCl), hydrochloric acid (HCl), potassium hydroxide (KOH) and sodium hydroxide (NaOH).

In addition to these standard tables, the user may enter their own table data for other chemicals or may edit the standard tables supplied by ATI. Custom tables require data on both concentration vs conductivity and temperature vs conductivity for the chemical of interest.

For pricing, please call AFC International at 1-800-952-3293, 219-987-6825 or fax 219-987-6826 or email


  • Adaptable concentration version for direct display of chemical concentrations
  • Extra Outputs – Expansion board to add a third analog output or three additional non-isolated low power relays
  • AC or DC Power Options
  • Flexible, programmable range options from 0-200 PPB up to 0-200 PPM provide maximum application flexibility
  • AC or DC Power Options
  • 3 Analog Output Options for conductivity and temperature
  • PID Output
  • Digital Communications available in either Profibus-DP, Modbus-RTU or Ethernet-IP
  • Relay Assignable – Three SPDT relays are standard, with three additional low power relays available as an option
  • Flexible Mounting
  • Large, back-lit, LCD Display


Display Range 0-200.0µs, 0-2.000/20.00/200.0/2000 mS, 0-2.000 S
Accuracy 0.5% of selected range or 0.02 ppm
Repeatability 0.3% of selected range or 0.01 ppm
Non-Linearity 0.1% of selected range
Temperature Drift 0.01% of span/ºC
Power 100-240 VAC, ±10%, 50/60 Hz
12-24 VDC, 500 mA maximum
Analog Outputs Two isolated 4-20 mA, 500Ω load maximum, 3rd output optional
Relays Three SPDT 5A @ 250 VAC, 5A @ 24 VDC, 3 additional SPST non-isolated 1A @ 30 VDC optional
Display 4 digit, 0.75″ numeric LCD with 12 digital second line, LED back light
Enclosure NEMA 4X polycarbonate V-0 flammability
Operating Conditions -4 to 140ºF
Sensitivity 0.05% of span or 0.01 mS
Digital Output Profibus DP, Modbus RTU, Ethernet IP
Mounting Wall mounting kit standard, panel mount bracket and pipe u-bolt available
Size 5.6″ x 4.9″ x 6.4″

Sensor Specifications

Sensor Toroidal inductive
Materials NORYL
Sensor Cable 20 feet standard, 200 feet maximum
Temperature Limits 0-105°C, 0-50ºC with flowcell
Pressure Limits 0-150 psig
Connection ¾” MNPT rear thread
Flowcell 2″ CPVC with alignment key

Ordering Information

Other configurations available For pricing, please call AFC International at 1-800-952-3293, 219-987-6825 or fax 219-987-6826 or email

Catalog No.
Q45CT Toroidal/Conductivity Monitor, 100-240V, Noryl sensor with 20′ cable
Q45CT Toroidal/Conductivity Monitor, 12-24 VDC, Noryl sensor with 20′ cable Q46CT-2-1-1-1-1
Q45CT Toroidal/Conductivity Monitor, 100-240V, Noryl sensor with 20′ cable, Profibus DP Q46CT-1-1-2-1-1
Q45CT Toroidal/Conductivity Monitor, 100-240V, Noryl sensor with 20′ cable, Ethernet/IP, additional relay Q46CT-1-1-4-2-1


Q46CT Toroidal Conductivity Monitor datasheet

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