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Dual Cell Conductivity Analyzer
Model DC402G
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Flexibility, reliability and low maintenance are among the benefits provided by the EXA DC402G conductivity analyzer. Designed to meet the exacting requirements of measuring dual cell conductivity and resistivity in the modern industrial environment, it contains many features to ensure the best precision whatever the application. Differential, ratio, deviation, % passage or % rejection can be indicated and/or transmitted.
The DC402G is housed in a robust IP65 field mountable case. Two mA outputs, four relays, digital communication and a clear LCD make the DC402G a truly comprehensive package. The DC402G features PI control on the auxiliary mA output and the pulse proportional relay outputs, thus avoiding the need for a separate controller.
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Differential, ratio or calculated outputs. |
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Universal conductivity/resistivity, software switchable. |
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On-line sensor checking. |
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Self-tuning measuring signal. |
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Matrix temperature compensation for pure water applications. |
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Four fully configurable SPDT contact outputs. |
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Two fully configurable mA outputs. |
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Built-in PI controller. |
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Easy to use EXA control panel. |
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USP <645> monitoring. |
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| Input specification |
Two inputs , each 2-electrode measurement with square wave excitation, using cell constants(C) from 0.008 to 50.0 cm-1, with up to 60 meters connection cable |
| Detection method |
Frequency, read-pulse position and reference voltage are dynamically optimized. |
| Input ranges |
Conductivity:
Minimum: 1 μS/cm at process temp. (under range 0.000 μSx C).
Maximum: 25 mS/cm at process temp. (over range 30 mS x C)
| Resistivity: |
0.00 kΩ/C to 999 MΩ/C at 25 deg C (77 deg F) reference temperature. |
Minimum: 40 Ω/C at process temp. (under range 0.001 kΩ x cm).
Maximum: 1 MΩ/C at process temp. (over range 999 MΩ x cm).
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)
8k55NTC: -10 to 120 deg C (10 to 250 deg F)
PB36 NTC: -20 to 120 deg C (0 to 250 deg F) |
| Output Span |
Conductivity/Resistivity
Min. span: 0.010 μS/cm; 0.001 kΩ x cm up to 90 % zero suppression.
Max. span: 1500 mS/cm; 999 MΩ x cm
Ratio (cell1/cell2): Min. span: 00.0, Max. span: 19.99
Difference (cell1-cell2): Min. span: 0.010 μS/cm, Max. span: 400 mS/cm
% Passage (100 x [cell2/cell1]): Min. span: 00.0, Max. span: 199.9
% Rejection (100 x [(cell1-cell2)/cell1]): Min. span: 0.1, Max. span: 400
% Deviation (100 x [(cell2-cell1)/cell1]): Min. span: 0.1, Max. span: 400
Temperature: Min. span: 25 deg C (50 deg F), Max. span: 250 deg C (500 deg F)
Difference Temperature: Min. span: 25 deg C (50 deg F), Max. span: 250 deg C (500 deg F) |
| Transmission Signals |
Two isolated outputs of 0/4 to 20 mA DC with common negative. Maximum load; 600Ω.Auxiliary output can be chosen from conductivity, linearized conductivity/resistivity, temperature, differential temperature calculated value or PI control of conductivity/resistivity. Burn up (22 mA) or Burn down (0/3.5 mA) to signal failure. |
| Temperature compensation |
Automatic, for temperature ranges.
Reference temperature : Programmable from 0 to 100 deg C(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 % per deg C(deg F) by adjustment or calibration.
Matrix compensation: With conductivity function of concentration and temperature. Choice of 5 preprogrammed matrices and a 25-points user-programmable matrix. |
| Display |
Custom liquid crystal display, with a main display of 3 1/2 digits 12.5 mm high. |
| Contact Outputs |
Four (4) SPDT relay contacts with LED indicators. |
| Housing |
Cast aluminum case with chemically resistant coating, cover with flexible polycarbonate window. Weather resistant to IP65 / NEMA 4X / CSA Type 3S standards. Pipe wall or panel mounting, using optional hardware. |
| Power Supply |
Supply voltage rating: 115, 230 V AC, Applicable range: 97.8 to 132.2 /195.5 to 264.5 V AC
Supply frequency rating: 50/60 Hz, Applicable range: 50/60 Hz ± 5%
Power consumption: Maximum 10 VA for steady operation |
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| Conductivity/resistivity |
Linearity: ±0.5 % FS
Repeatability: ±0.5 % FS
Accuracy: ±0.5 % FS |
| Temperature |
Pt1000Ω, Ni100Ω and PB36 NTC
Linearity: ±0.3 deg C
Repeatability: ±0.3 deg C
Accuracy: ±0.3 deg C
PT100Ω and 8k55Ω
Linearity: ±0.4 deg C
Repeatability: ±0.4 deg C
Accuracy: ±0.4 deg C |
| Step response |
90 % (< 2 decades) in ≤6 seconds |
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Monitoring performances of cation exchange columns (Ratio output). |
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Leak detection of heat exchanges (Deviation output). |
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Monitoring performance of reverse osmosis columns (Percent rejection output). |
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Controlling flowrate of wash water (Differential output). |
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Controlling blow-down of cooling towers (Ratio output). |
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Redundancy for accurate analysis (Deviation output). |
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Monitoring very high purity systems (Differential Resistivity). |
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Pharmaceutical water monitoring (USP<645>). |
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Dual Cell Conductivity Analyzer DC402G |
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