CT2X Conductivity Sensors Seametrics

The Seametrics CT2X Smart Sensor is a microprocessor-based submersible conductivity/temperature sensor with built-in data logging. This device stores thousands of records of conductivity, temperature, salinity, and total dissolved solids (TDS). The CT2X is also available with a depth/level option giving added functionality in the same sensor housing. The CT2X incorporates 4-pole electrode cell measurement technology for conductivity, salinity, and TDS.

This technology reduces fringe field interference errors, lessens inaccuracy caused by polarization effects, and lowers contact resistance problems. Four-pole electrode technology also allows users to work with one electrode over a wide range of conductivity. The conductivity element is constructed of epoxy/graphite, making it extremely durable for use in rugged field conditions. To clean, simply scrub with a small brush.

Depth and level are measured with an extremely rugged and stable piezo-electric, media isolated pressure element and compensated for temperature using our proprietary calibration methodology. Temperature is measured using an epoxy bead thermistor. The CT2X is powered internally with two replaceable AA batteries.

Alternately it can be powered with an external auxiliary power supply for data-intensive applications. Several CT2Xs, or a combination of CT2Xs and other Smart Sensors, can be networked together and controlled directly from a single computer. While most will use the CT2X with our free, easy-to-use Seametrics Aqua4Plus 2.0 software, it is by no means limited to that software. You can use your own Modbus® RTU or SDI-12 software or logging equipment to read measurements, thus tying into your existing telemetry and control systems.

Features

• Measures conductivity, total dissolved solids, and temperature
• Ranges from 10 microsiemens/cm to 100,000 microsiemens/cm (200,000 and 300,000 microsiemens/cm available on request)
• Pressure and level option available
• In-field calibration utilities
• Narrow 0.75″ diameter, 12.5″ or 16″ length (depending on version)
• Linear and nLFn temperature compensation
• Up to 349,000 records in non-volatile memory
• 316 stainless steel, fluoropolymer, and PTFE construction (titanium optional)
• Digital industry standard RS485 interface
• Available with a variety of cable options—including polyethylene, polyurethane, and FEP Teflon
• Modbus and SDI-12 protocols available
• Easy export to spreadsheets and databases

Specification

Housing & Cable	Weight	1.0 lb. (0.5 kg)
	Body Material	Acetal & 316 stainless or titanium
	Wire Seal Material	Fluoropolymer and PTFE
	Cable	Submersible: polyurethane, polyethylene, or ETFE (4 lb./100 ft., 1.8 kg/30 m)
	Desiccant	1-3 mm indicating silica gel
	Field Connector	Standard
Temperature	Operating Range	Recommended: -5 ̊ to 40 ̊C (23 ̊ to 104 ̊F) Requires freeze protection kit if using pressure option in the water below freezing.
	Storage Range	Without batteries: -40 ̊ to 80 ̊C (-40 ̊ to 176 ̊F)
Power	Internal Battery	Two replaceable lithium ‘AA’ batteries - Battery life: 12 months at 15 min. polling interval (may vary due to environmental factors)
	Auxiliary	12 Vdc - Nominal, 9-15 Vdc - range
Communication		RS485 Modbus® RTU (output = 32-bit IEEE floating point), SDI-12 (ver. 1.3) - ASCII
Logging	Memory	4MB - 349,000 records
	Logging Types	Variable, user-defined, profiled
	Logging Rates	4x/sec maximum, no minimum
	Baud Rates	9600, 19200, 38400
	Software	Complimentary Aqua4Plus 2.0
	Networking	32 available addresses per junction (Address range: 1 to 255)
	File Formats	.a4d and .csv
Output Channels		Temperature	Pressure¹		Conductivity
	Element	30K ohm thermistor, Epoxy bead/external housing, Pyrex® glass	Silicon strain gauge transducer316 stainless or Hastelloy		Epoxy/Graphite - 4-pole
	Accuracy	±0.25 ̊C	±0.05% FSO (typical, static) ±0.1% FSO (maximum, static)(B.F.S.L. 20 ̊C		Static: ±0.5% of measured value (0 - 100,000 μS/cm)
	Resolution	0.1 ̊C	0.0034% FS (typical)		(32 bit internal) 0.1 μS/cm, 0.001 mS/cm, 0.1 mg/L (TDS), 0.001 PSU
	Units	Celsius, Fahrenheit, Kelvin	PSI, FtH₂O, inH₂O, mmH₂O, mH₂O, inH₂O, cmHg, mmHg, Bars, Bars, kPa		μS/cm, mS/cm, mg/L, PSU
	Range	-5 ̊ to 40 ̊C (23 ̊ to 104 ̊F)	Gauge	PSI: 1²,5,7,15,30,50,100,300 FtH₂O: 2.3²,12,35,69,115,231,692 mH₂O: 0.7²,3.5,5,10.5,21,35,70,210	Conductivity1: 0-300,000 μS/cmTDS: 4.9-147,000 mg/L Salinity: 2-42 PSU
			Absolute²	PSI: 30, 50, 100, 300 FtH₂O: 35, 81, 196, 658 mH₂O: 10, 24, 59, 200
	Compensated	---	0 ̊ to 40 ̊C (32 ̊ to 104 ̊F)		Thermal: None, Linear, or nLFn
	Compensated	---	---		200 msec
Max operating pressure		1.1 x FS
Over pressure protection		3x full scale up to 300psi
Burst pressure		1000 psi (approx. 2000 ft or 600 m)
Environmental		IP68, NEMA 6P

*Specifications subject to change. Please consult our web site for the most current data (seametrics.com). Modbus is a registered trademark of Schneider Electric. Pyrex is a registered trademark of Corning Incorporated.
1 Accuracy reduced at levels <10 μS/cm and >100,000 μS/cm
2 ±0.25% accuracy FSO (max) at this range
3 Depth range for absolute sensors has 14.7 PSI subtracted to give actual depth allowed

 

Reference
http://www.seametrics.com/product/ct2x/