Flexibility, reliability and low maintenance are among the benefits provided by the EXA SC202 conductivity analyzer. Designed to meet the particular requirements of measuring conductivity and resistivity in the modern industrial environment, it contains many features to ensure the best precision whatever the application.
The transmitter is housed in a robust IP65 field mountable case and combined with the easy and clear LCD makes the SC202 a complete industrial transmitter. The logbook can be used to record events like calibrations and diagnostic messages. A wide variety of temperature compensation possibilities (NaCl according to IEC 746-3, manual TC, preprogrammed matrices and a free programmable 5x5 matrix), provide a high-accuracy measurement with a minimum effort. The addition of a USP23 pure water monitoring feature also makes the SC202 suitable for the pharmaceutical industry.
Yokogawa has implemented three leading process Fieldbus technologies in their 202 series: HART, Foundation Fieldbus H1 and Profibus PA. All transmitters are provided with the important and widely used Device Description files that provide information on parameters and other data in each device, as well as the ability to include algorithmic relationships such as calibrations.
|Input specifications||Two or four electrode measurement with square wave excitation.
Cell constant from 0.008 to 50.0 cm-1
|Detection method||Frequency, read-pulse position and reference voltage are dynamically optimized.|
Minimum: 0 μS/cm
Maximum: 200 mS x C (overrange 1999 mS/cm).
Minimum: 0.005 kΩ/C
Maximum: 999 MΩ x cm
Pt1000: -20 to 250°C (0 to 500°F)
Pt100 and Ni100: -20 to 200°C (0 to 400°F)
8k55 NTC: -10 to 120°C (10 to 250°F)
PB36 NTC: -20 to 120°C (0 to 250°F)
|Output Span||Conductivity: Min. 0.01 μS/cm, Max. 1999 mS/cm. (Max 90 % zero suppression)
Resistivity: Min. 0.001 kΩ x cm, Max. 999 MΩ x cm. (Max 90 % zero suppression)
|Transmission Signals||Isolated output of 4 to 20 mA DC. Burn up (21 mA) or Burn down (3.6 mA when HART or distributor comm. is non-used, 3.9 mA when HART or distributor comm. is used) or pulse of 21 mA to signal failure.|
|Temperature compensation||Automatic, for temperature ranges
Reference temp.: programmable from 0 to 100°C or 30 to 210°F (default 25°C).
|Compensation algorithm||NaCl: According IEC60746-3 NaCl tables (default).
T.C: Two independent user programmable temperature coefficients, from 0 to 3.5 % per °C (°F) by adjustment or calibration.
Matrix: Conductivity function of concentration and temperature. Choice out of 5 preprogrammed matrices and a 25-point user programmable matrix.
|Communications||HART®, PROFIBUS-PA, FOUNDATION Fieldbus H1|
|Ambient temperature||-10 to 50 °C|
|Humidity||10 to 90 % RH (Non-condensing)|
|Display||Custom liquid crystal display, with a main display of 3 1/2 digits 12.5 mm high.|
|Power supply||Nominal 24 volt DC loop powered system.
SC202G: 17 to 40 V
SC202S: 17 to 31.5 V
|Conductivity||Accuracy: ±0.5 % F.S. (2 μS x K cm-1 to 200 mS x K cm-1)|
|Resistivity||Accuracy: ±0.5 % F.S. (0.005 kΩ/K cm-1 to 0.5 MΩ/K cm-1)|
|Temperature||Accuracy: ±0.3°C (Pt1000, PB36NTC, Ni100)|
|Step response||90% (|
Measurement and control of Heat Exchanger Leakage can help prevent costly maintenance, repair and downtime. The simple, essentially maintenance-free measurement of condensate conductivity will give the operator information necessary (or provide automatic control) to prevent severe damage to the boiler should a breakthrough of the heat exchanger occur.
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