TA 197 LF deep water conductivity cell
The Cond 1970i portable conductivity meter is great for measurements in bore holes (down to 2" diameter), wells and deep bodies of water with the ability to take measurements down to 330 ft (100 m) in combination with the TA 197 LF depth armature.  The TA 197 LF submersible conductivity cell includes a built-in temperature sensor, up to 330 feet (100 m) cable with waterproof plug (IP 67), pressure-resistant steel armoring with screw-off protective hood, and is pressure-resistant to 145 psi (10 bar).

TetraCon® 325 Conductivity Probe
The TetraCon® 4-electrode system sets a new standard for professional conductivity measurements.  In comparison with conventional measuring cells with 2 electrodes, the TetraCon® 325 conductivity cell offers numerous technical advantages:

• Highly accurate and linear because of optimized cell geometry
• Extremely large measuring range with just one cell
• Long-term cell constant stability with high-quality abrasion-resistant graphite electrodes
• Built-in temperature sensor as standard
• Smallest immersion depth possible
• Automatic resistance compensation provides accurate measurements even with a dirty electrode
• Measurement not affected by cable influences, polarization effects or contact with side walls
• Robust, unbreakable epoxy body

Conductivity meter measurements
Conductivity is a parameter used to measure the ionic concentration and activity of a solution.  The more salt, acid or alkali in a solution, the greater its conductivity.  The unit of conductivity is S/m, often also S/cm.  The scale for aqueous solutions begins with pure water at a conductivity of 0.05 uS/cm (77 °F /25°C).  Naturally occurring waters such as drinking water or surface water have a conductivity in the range 100 – 1000 uS/cm.  At the upper end of the chart some acids and alcalines can be found.

Conductivity measurements are used for applications such as in the production of ultrapure water or determining the salinity of sea water.

Conductivity is measured by making a measurement of the electrical resistance.  The simplest kind of measuring cell used consists of two similar electrodes.  An alternating voltage applied to one of the electrodes causes the ions in the solution to migrate towards the electrodes.  The more ions in the solution, the greater the current which flows between the electrodes.  The instrument measures the current and uses Ohm's law to calculate first the conductance of the solution and then – by taken the cell data into account – the conductivity.

Portable conductivity meter applications
The ProfiLine Cond 1970i portable conductivity meters will work well in ground water, surface water, laboratory, food industry (juice), swimming pools, pharmaceutics, paint/varnish (soluble), or electorplating measurement applications.

Portable Conductivity Meters Specifications

ProfiLine Cond 1970i
Range/Resolution:
     Conductivity: 0.0 uS/cm to 500 mS/cm in 5 measuring ranges or autorange, 0.00 uS/cm to 19.99 uS/cm (for K=0.1 cm^-1), 0.000 uS/cm to 1.999 uS/cm (for K=0.01 cm^-1)
     Temp: 23 to 221 °F (-5.0 to +105.0 °C)
     Salinity: 0.0 to 70.0
     TDS: 0 to1999 mg/l
Accuracy:
     Conductivity: + 0.5% of value
     Temperature: + 0.1 K
Reference temp: 68 to 77 °F (20 or 25 °C), selectable
Cell constant: Calibratable 0.450 to 0.500 and 0.800 to 1.200 cm^-1, fixed: 0.01 cm^-1 freely adjustable 0.25 to 2.5 cm^-1 and 0.09 to 0.11 cm^-1
Temperature comp: Automatic, can be switched off
Power: Rechargeable NiMH batteries (approx. 600 hours per full charge)
AC power: Wide-range power supply 100-240 VAC 50/60 Hz (included)
Dimensions (LxWxH): 3.54x7.87x7.48 in (90x200x190 mm)
Weight: 3.3 lb (1.5 kg) (without plug-in power supply)
Ingress protection: IP 67
Electrical safety: Protective class III
Ambient conditions
     Operation: 14° to 131°F (-10° to 55°C)
     Storage: 13° to 149°F (- 25° to 65°C)
Test certificates: cETLus, CE

TetraCon® 325 Probe
Electrode material: Graphite
Shaft material: Epoxy
Shaft length: 4.72 in (120 mm)
Cell constant: K = 0.475 cm^-1
Diameter: 0.60 in (15.3 mm)
Cable length: 4.9 ft (1.5 m)
Measuring range: 1 uS/cm to 2 S/cm
Temperature range: 32 to 212 °F (0 to 100 °C)
Min/max immersion depth: 1.4/4.7 in (36/120mm)

TA 197 LF Submersible Conductivity Probe
Range: 10 uS/cm to 2 S/cm
Cell constant: 0.475 cm^-1 ± 1.5 %
Temperature measurement
     Thermistor: Integrated NTC (30 kW / 25°C)
     Temp range: -5 to +60°C
     Temp accuracy: ± 0.2 K
Electrodes: 4, graphite
Body materials: Stainless steel (1.4571) & epoxy
Dimensions: 38 mm dia. x 246 mm L (overall)
Cable lengths: 25 m, 40 m, 60 m, 100 m (cable is exchangeable by WTW-Service)
Immersion depth: Min. (80 mm), Max. 330 FT (100 m)
Pressure resistance: 145 psi (10 bar) max.
Weight: (1,113 g) sensor & hood w/o cable
Storage medium: Air