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C4D-720 capacitively coupled contactless conductivity detector module

a C4D-700
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The C4D-720 is a compact conductivity detector module. It is based on the simple principle. The AC voltage is not directly applied to the segment on the capillary, but coupled through two cylindrical capacitors. The resulting current is monitored and recorded. We take the current divided by the excitation voltage and get the conductivity. The main advantage of this detection method is the elimination of making any window on the capillary and very high sensitivity can be achieved for analyzing small ions which are rather difficult to be detected by UV absorption method.

The special CE Flow Cell has the same outer dimension as those for other detectors.

It works with all our autosamplers through the built-in serial connection and 12VDC power cable. With PKS Station control software and a RS232 cable (optionally USB or TCP/IP) it can also be used as a stand-alone detector.

C4D-720 Specifications
Exciter Voltage 0 - 200V p-p programmable
Exciter Frequency 64 - 640 kHz programmable
Noise level at empty cell (time constant 1 s) ±2x10-4 RCU
Drift at empty cell (constant room temperature, steady operation for 1/2 to 1 hrs) 2x10-3 RCU/hr
Capillary O.D. 365 µm
Capillary I.D. 100, 75, 50, 25, 10 µm
Time constant 10, 5, 2, 1, 0.5, 0.2, 0.1, 0.05, 0.04, 0.033, 0.02, 0.016, 0.01 sec.
Display 122x32 Graphic LCD
Output 1V/AU at scale = 1
Output scale 2, 1, 0.5, 0.2, 0.1, 0.05, 0.02, 0.01, 0.005, 0.002, 0.001
Interface RS232 (USB, TCP/IP optional)
Input voltage 220VAC/50Hz, 115VAC/60Hz
Power input (wattage) 75 VA
Dimensions (Width x Depth x Height) 215 x 135 x 100 mm
8.46 x 5.31 x 3.95 in.
Weight 3 kg


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