1.General Introduction
Yokogawa SC450G is a four wire conductivity analyzer converter to measure specific conductivity with contacting electrodes, accepts sensors with cell constants ranging from 0.005 till 50/cm; 2-electrode sensors as well as 4-electrode sensors; 5 different temperature compensating elements for accurate temperature compensation. It owns Unique touch screen operation with menu structure in 5 languages, enhanced diagnostics, process trending graphics and on-screen logbook for data storage, Two mA outputs and four SPDT relay contacts with display indicators and Hart communications optional.
2.General Specifications
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Items
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Description
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Input specification
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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
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Detection method
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Frequency, read-pulse position and reference voltage are dynamically optimized.
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Input ranges
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Conductivity: 0.000μS/cm to 2000mS/cm, Minimum: 1μS/cm (under range 0.000μSx C); Maximum: 200mS/cm (over range 2000mS x C).
Resistivity: 0.0 Ω x cm to 1000 MΩ x cm, Minimum: 5 Ω x cm (under range 0 Ω/C); Maximum: 1 MΩ x cm (over range 1000 MΩ/C).
Temperature: Pt1000: -20 to 250°C (0 to 500°F), Pt100 and Ni100: -20 to 200°C (0 to 400°F); NTC 8k55: -10 to 120°C (10 to 250°F); Pb36 NTC: -20 to 120°C (0 to 250°F)
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Conductivity/Resistivity Accuracy)
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≤0.5 % of reading
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Temperature Accuracy
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≤0.3°C (≤ 0.4°C for PT100)
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Step Response
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≤4 sec for 90 % (for a 2 decade step)
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Transmission Signals
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Two isolated outputs of 4 to 20mA DC with common negative. Maximum load 600 Ω. Bi-directional HART digital communication, superimposed on mA1 (4 to 20mA) signal. Burn up (21.0mA) or Burn down (3.6mA) to signal failure accorded with NAMUR NE43.
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Temperature compensation
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Automatic or manual, for temperature ranges.
Reference temp.: programmable from 0 to 100°C or 30 to 210°F (default 25°C)
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Compensation algorithm
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According IEC 60746-3 NaCl tables (default).
Two independent user programmable temperature coefficients, from 0 to 3.5 %/°C (°F) by adjustment or calibration.
Matrix compensation: with conductivity function of concentration and temperature. Choice out of 13 preprogrammed matrixes.
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Display
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Graphical Quarter VGA (320 x 240 pixels) LCD with LED backlight and touch screen.
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Contact Outputs
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Four SPDT relay contacts with display indicators.
Contact outputs configurable for hysteresis and delay time.
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Contact Input
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Remote range switching to 10 times the programmed range
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Power Supply
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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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3.Model Selection
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Main Code
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Suffix Code
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Description
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SC450G
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Conductivity/Resistivity Converter
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Power
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-A
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AC version (100 to 240 VAC)
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-U
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DC version (12 to 24 VDC)
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Type
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-A
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General purpose version
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-U
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FM version
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Optional codes
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/UM
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Universal mounting kit (panel,pipe, wall)
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/U
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Pipe and wall mounting hardware
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/PM
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Panel mounting hardware
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/H5
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Awning hood (stainless steel)
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/AFTG
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G1/2
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/ANSI
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1/2NPT
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/AM20
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M20
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/SCT
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Stainless steel tag plate
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4.External Dimensions
