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.
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 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.
ATI’s Model Q46CT 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 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.
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.
- Concentration version for direct display of chemical concentrations
- 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 0-200.0µs up to 0.2.000 S provide maximum application flexibility
- Power options include universal 100-240 VAC ±10% or 12-24 VDC
- 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
- Standard PID control function assignable to one analog output
- Available in either Profibus DP, Modbus RTU or Ethernet IP
- Three SPDT relays are standard with relay functions programmable for alarm, control or trouble indication. Three additional low power relays available as an option.
- NEMA 4X (IP-66) enclosure is suitable for wall, pipe or panel mounting
- Black-lit large LCD display provides clear visibility in any lighting conditions. A scrolling second line on the display provides additional information and programming prompts.
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.
Specifications – Monitor
|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″|
Specifications – Sensors
|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|
Other configurations available For pricing, please call AFC International at 1-800-952-3293, 219-987-6825 or fax 219-987-6826 or email firstname.lastname@example.org
|Q45CT Toroidal/Conductivity Monitor, 24VDC, 2 Wire, Polypropylene with 20′ Cable|
|Q45CT Toroidal/Conductivity Monitor, 115 VAC with 2 Relays & 2 Outputs, Polypropylene with 20′ Cable||Q45CT-2-1-1|
|Q45CT Toroidal/Conductivity Monitor, 24 VDC, 2 Wire, PEEK With 20′ Cable||Q45CT-1-3-1|
|Q45CT Toroidal/Conductivity Monitor, 115 VAC with 2 Relays and 2 Outputs, PEEK With 20′ Cable|