INT9 - internal 24-bit A/D converter for PCI

INT9 - internal PCI A/D Converter

INT9 is an internal 24-bit A/D converter card that measures the voltages of chromatographic and electrochemical detectors. It contains up to four data-acquisition channels on one board (one and two channel versions are also available). The channels are completely independent, equipped with A/D converters using continuous integration and able to process both positive and negative voltages. INT9 can simultaneously perform data acquisition from multiple detectors. Individual channels can be assigned to different chromatographs. The card includes four digital inputs and eight digital outputs. The first four digital outputs are also equipped with relay contacts. Digital inputs and outputs are generally used to synchronize Start and Stop of the analysis with autosampler or chromatograph. However, Clarity Event table enables to use them to trigger various actions or to control additional devices. The card provides excellent reliability and temperature stability.

INT9 is a modernized successor of the successful INT7 PCI card.

Required PCI slot:

Full size PCI 2.0, 32 bit PCI slot for 5V 32 bits half-length extension card.
Low profile or PCI Express slots cannot be used.

Advantages of the INT9 A/D converter:

  • Continuous integration of input signal.
  • The amount of data entering the computer is substantially smaller, since individual data items already represent partial integrals.
  • Isolations prevent noise from both other channels and from the PC.
  • Integration frequency up to 400 Hz enables Fast GC application.

Next steps


  • Cable p/n KB72 or KB74 depending on number of channels

Technical data:

Converter type 24 bit integrating, delta-sigma integration
Analog inputs differential
Number of channels 1, 2 or 4 fully independent and isolated
Input impedance > 1 MOhm
Input range unipolar and bipolar, each channel independentely switchable to 156, 1250 or 12 123 mV
Sample rate 6.25, 12.5, 25, 50, 100, 200, 400 samples per second for 50 Hz mains frequency filter
7.5, 15, 30, 60, 120, 240, 480 samples per second for 60 Hz mains frequency filter
Non-linearity < 0.003 %
Temperature dependence < 10 ppm/°C
Digital inputs 4 TTL (5 V)
Digital outputs 8 TTL (5 V, maximum current load 20 mA),
the first four outputs are also equipped with control relays (100 V/0.5 A)
PC interface standard PCI slot (PCI Express cannot be used)

Typical noise free resolution for various acquisition speeds and input ranges

12 123 mV 1 250 mV 156 mV
6.25 Hz 21.5 bit 21.5 bit 20 bit
25 Hz 21 bit 21 bit 20 bit
100 Hz 19.5 bit 19.5 bit 19.5 bit

Possible combinations:

Windows 10
(32 and 64bit)
Windows 8.1
(32 and 64bit)
Windows 7SP1*
INT9 Clarity
Clarity Lite
both from version 6.2
Clarity Lite
both from version 4.0.3
Clarity Lite
both from version 2.5

* From Clarity (Lite) 3.0 the 64-bit OS is supported.

Combinations with obsolete operating systems:

Windows XPSP3* VistaSP2* Windows 2000
INT9 Clarity, Clarity Lite
both from version 2.4.4 until 7.4.1
Clarity, Clarity Lite
both from version 2.5 until 7.2
Clarity, Clarity Lite
both from 2.4.4 to 3.0

* From Clarity (Lite) 3.0 the 64-bit OS is supported.

A/D Converters

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Last updated: 2020-06-06 | webmaster