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4-Wire Conductivity/Resistivity Analyzer
Model SC450G
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The EXAxt SC450G is designed to combine the superior functionality of the Yokogawa EXA series with the ease of use offered in pocket computers (PDA). Truly unique is the EXAxt 450 series in the Human Machine Interface (HMI). The high resolution graphical display and the touch screen operation make all information visible to the operator.
The SC450G offers the best accuracy in the industry by combining the conductivity measurement with advanced temperature compensation functionality, preloaded calibration standards and cell fouling monitoring.
The SC450G offers ultra pure water compensation for demineralised water (default: NaCl), for stream, condensate and boiler water analysis (cation conductivity, ammonia and morpholine conductivity). The SC450G also offers matrix compensation and output linearization for accurate analysis of strong acids and alkalis especially for the monitoring of ultra pure water in the pharmaceutical industry, the functionality of USP chapter 645, first published in USP23, is implemented.
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IP66/NEMA4X 1/2DIN enclosure for Field mounting and Panel mounting. |
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Unique HMI with menu structure and high resolution graphical display with touch screen. |
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Interactive display with choice out of 8 languages. |
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Trending display for up to 2 weeks. |
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On-screen logbooks store calibration data, configuration changes and events. |
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Advanced Process Temperature Compensation. |
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Cell fouling monitoring. |
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HART® Communications. |
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FM Class I, Div. 2 Group A, B, C and D. T6 for Ta -20 to 55 deg C. |
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| Input specification |
Two or four electrode measurement with square wave excitation, using max. 60 m cable and cell constants from 0.005 to 50.0 cm-1 |
| Detection method |
Frequency, read-pulse position and reference voltage are dynamically optimized. |
| Input ranges |
Conductivity: 0.000 μS/cm to 2000 mS/cm
Minimum: 1 μS/cm (underrange 0.000 μSx C).
Maximum: 200 mS/cm (overrange 2000 mS x C).
Resistivity: 0.0 Ω x cm to 1000 MΩ x cm
Minimum: 5 Ω x cm (underrange 0 Ω/C).
Maximum: 1 MΩ x cm (overrange 1000 MΩ/C).
Temperature: Pt1000: -20 to 250 deg C (0 to 500 deg F)
Pt100 and Ni100: -20 to 200 deg C (0 to 400 deg F)
NTC 8k55: -10 to 120 deg C (10 to 250 deg F)
Pb36 NTC: -20 to 120 deg C (0 to 250 deg F) |
| Transmission Signals |
Two isolated outputs of 4 to 20 mA DC with common negative. Maximum load 600 Ω. Bi-directional HART digital communication, superimposed on mA 1 (4 to 20 mA) signal. Burn up (21.0 mA) or Burn down (3.6 mA) to signal failure accorded with NAMUR NE43. |
| Temperature compensation |
Automatic or manual, for temperature ranges.
Reference temp.: programmable from 0 to 100 deg C or 30 to 210 deg F (default 25 deg C). |
| Compensation algorithm |
According IEC 60746-3 NaCl tables (default).
Two independent user programmable temperature coefficients, from 0 to 3.5 %/deg C (deg F) by adjustment or calibration.
Matrix compensation: with conductivity function of concentration and temperature. Choice out of 13 preprogrammed matrixes. |
| Display |
Graphical Quarter VGA (320 x 240 pixels) LCD with LED backlight and touchscreen. |
| Contact Outputs |
Four SPDT relay contacts with display indicators.
Contact outputs configurable for hysteresis and delay time. |
| Contact Input |
Remote range switching to 10 times the programmed range. |
| Power Supply |
85 to 265 V AC ±10 %, 47 to 63 Hz, maximum consumption 10 VA.
9.16 to 30 V DC ±15 %, maximum consumption 10 W. |
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| Conductivity/resistivity |
≤0.5 % of reading |
| Temperature |
≤0.3 deg C (≤ 0.4 deg C for PT100) |
| Step respons |
≤4 sec for 90 % (for a 2 decade step) |
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4-Wire Conductivity/Resistivity Analyzer SC450G |
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