DC402G Dual Cell Conductivity Analyzer

Model DC402G
Dual Cell Conductivity Analyzer

Product Information

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.

		General Specification for DC402G
		General Specification for Conductivity Sensors
		User's Manual for DC402G

Selection Guide for Conductivity Analyzer

Features

*	Differential, ratio or calculated outputs.
*	Universal conductivity/resistivity, software switchable.
*	On-line sensor checking.
*	Self-tuning measuring signal.
*	Matrix temperature compensation for pure water applications.
*	Four fully configurable SPDT contact outputs.
*	Two fully configurable mA outputs.
*	Built-in PI controller.
*	Easy to use EXA control panel.
*	USP <645> monitoring.

Specifications

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℃ (77℉) 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℃ (0 to 500℉)
Pt100 and Ni100: -20 to 200℃ (0 to 400℉)
8k55NTC: -10 to 120℃ (10 to 250℉)
PB36 NTC: -20 to 120℃ (0 to 250℉)

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℃ (50℉), Max. span: 250℃ (500℉)
Difference Temperature: Min. span: 25℃ (50℉), Max. span: 250℃ (500℉)

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℃ (30 to 210℉ (default 25℃ ).

Compensation algorithm

According IEC 60746-3 NaCl tables (default).Two independent user programmable temperature coefficients, from 0 to 3.5 % per℃ (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

Performance

Conductivity/resistivity	Linearity: ±0.5 % FS Repeatability: ±0.5 % FS Accuracy: ±0.5 % FS
Temperature	Pt1000Ω, Ni100Ω and PB36 NTC Linearity: ±0.3℃ Repeatability: ±0.3℃ Accuracy: ±0.3℃ PT100Ω and 8k55Ω Linearity: ±0.4℃ Repeatability: ±0.4℃ Accuracy: ±0.4℃
Step response	90 % (< 2 decades) in ≤6 seconds

Applications

*	Monitoring performances of cation exchange columns (Ratio output).
*	Leak detection of heat exchanges (Deviation output).
*	Monitoring performance of reverse osmosis columns (Percent rejection output).
*	Controlling flowrate of wash water (Differential output).
*	Controlling blow-down of cooling towers (Ratio output).
*	Redundancy for accurate analysis (Deviation output).
*	Monitoring very high purity systems (Differential Resistivity).
*	Pharmaceutical water monitoring (USP<645>).