Microvolume Thermal Conductivity Detector (TCD-3)

thermal conductivity detectors
Microvolume Thermal Conductivity Detector (TCD-3)
close move
  • Now with serial control or user friendly interface and control/monitor program on Windows
  • Enhanced thermal stability
  • Smaller, compact controller housing

Like our venerable TCD-2, our new TCD-3 is a dual filament, stand-alone thermal conductivity detector consisting of the detector housing and separate controller. However, the analog controls of the TCD-2 are replaced with full digital control implemented via a user interface or command console commands. Thermal stability is maintained in the detector to within 0.010°C, producing a stable, low-noise signal.

The TCD-3 controller generates an independent analog output signal for each of the detector filaments. In additional, a referenced analog output signal is generated by subtracting the output signal of one filament channel from the other. Each of these three output signals is provided in two full-scale spans: a ±1 volt scale and a ±10 volt scale.

TCD control program

The Windows-based control program (download at right) makes it easy to monitor unit performance and to set parameters such as detector temperature and filament power.

thermal conductivity detectors
TCD-3 control screen
close move
thermal conductivity detectors
TCD-3 graph screen
close move

Product numbers

Description Filaments VAC Product No.
Entire unit
(Includes cell, electronics, power supply, cables, and fittings)
Nickel-iron 110 TCD3-NIFE
230 TCD3-NIFE-220
Tungsten-rhenium 110 TCD3-WRE
230 TCD3-WRE-220
Dual filament cell/oven assembly Nickel-iron 110 TCD3-NIFED
230 TCD3-NIFED-220
Tungsten-rhenium 110 TCD3-WRED
230 TCD3-WRED-220
TCD-3 controller 110 TCD3-C
230 TCD3-C-220

Hardware specifications

Parameter Minimum Nominal Maximum Units Notes
Controller input voltage 44 48 52 V
Controller input current 0.1 1.5 A Vin = 48 Vdc
Input fusing 2.0 A Internal fuse, time delay type
Operating Temperature -10 40 °C
Storage Temperature -25 70 °C
Humidity 0 95 % Non-condensing
Controller weight 1.4 lbs. Without cables
Detector cell weight 3.0 lbs. Standard configuration
Detector temperature ambient 300 °C
Detector pressure 1 1000 psi Working pressure
Heater power 60 W Vin = 48 Vdc
Analog output (1V) -1.2 1.2 V 1V output signal
Analog output (10V) -12 12 V 10V output signal
Analog out impedance 100 Ω
Digital inputs -0.5 5.5 V Internal 4.7Ω pull-up to +5V
Digital input, logic high 2.0 V Minimum logic-high threshold
Digital input, logic low 0.8 V Maximum logic-low threshold
Digital output, voltage -50 50 V Open contacts; maximum volts
Digital output, current -0.5 0.5 A Continuous current rating