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DLCM
Logarithmic digital current meter (LDCM)

The hardware and software system for measuring of chromatographic signals "Meta-chrom" (complex) is designed to automate the old park of chromatographs such as LHM, model-3700, “Tsvet” series, etc. in terms of measuring the chromatographic signal and automation of processing of chromatographic information. The complex consists of two interconnected functional modules: logarithmic digital current meter (LDCM) and program for processing of chromatographic information "NetChrom" (further in the text processing program).

Photo: Logarithmic digital current meter

LDCM receives an analog signal (current), converts it into a digital code and transmits it to a personal computer. The processing program installed on a personal computer provides the operator with the functions of visual observation of the chromatogram, mathematical methods of its processing and storage methods. LDCM is assembled on the basis of 24-bit ADC.

LDCM is used to replace the amplifier FID of the old models of chromatographs of IMT-05 type, while the current measurement is done in the range from 1×10-14 to 5×10-7 А without range switching. LDCM has a source of polarizing voltage for supply of the flame ionization detector (FID).

Technical parameters

  • Number of analog inputs-1.
  • Data exchange with personal computer — via standard RS-232C interface.
  • Input resistance - not less than 1×106 Mohm.
  • Input current range - from 1×10-14 до 5×10-7 А.
  • The minimum measured half-width of the chromatographic peak is 0,5 s.
  • Level of fluctuation noises referred to input, no more than 1,2×10-14 А.
  • Reduced error of linear signal conversion, no more than ± 1 %.
  • Electrical power from a single-phase AC voltage from 187 to 242 V, frequency (50±1) Hz, mode of operation-continuous.
  • Power consumption (without personal computer), no more than — 3 VA.
  • Overall dimensions (width×depth×height), not more than — 230×150×55 mm.
  • Weight, not more — 1,3 kg.
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