TCD DC Power Supply & Bridge Control


Versatile • Reliable • Dependable


  • Delivers a high quality direct current to a thermal conductivity detector (TCD) or a gas density balance (GADE)
  • Binary step-type attenuator control allows the user a wide range of sensitivity control for various applications
  • Polarity switch provides a positive up-scale reading on a recorder or galvanometer
  • LED display permits continuous monitoring of the detector bridge current
  • Three models to chose from:

    • Model 40-200 (40-202, 220 V, 50 Hz) compatible with thermal conductivity cells or gas density balances containing GOW-MAC® filaments having a cold resistance from 12 ohms to 70 ohms. A zero control is provided to cover the broad resistance range of the detector filaments.

    • Model 40-200A (40-202A, 22 V, 50 Hz) same as the Model 40-200 but includes a 10x signal amplifier for added sensitivity

    • Model 40-400 (40-402, 220 V, 50 Hz) compatible with all thermistor thermal conductivity cells or thermistor gas density balances having a resistance from 7,000 to 10,000 ohms at 25 °C
Model 40-200 Power Supply

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