GTC-395 Thermocouple Digital Display

GTC-395 Thermocouple Digital Display

GTC-395 Product Manual – click to download (Note: Requires the Adobe Acrobat Reader)


The GTC-395 thermocouple vacuum gauge is a single station thermocouple type gauge controller housed in a 1/8th DIN case. The unit uses the rugged and proven GTC-036 sensor over a pressure range of 1 mTorr to 3000 mTorr with an at atmosphere indication. The gauge features two independent relays that can be set within the range of the gauge, each set point includes a separate high and low pressure value. Three front panel buttons allow the user to toggle through and adjust the values. LED’s indicate which value is being displayed with separate LED’s to indicate the status of the set points. The unit features an RS-232 serial interface that allows a remote system to request information and a separate linear analog voltage output that is proportional to pressure.


  • Easy to read pressure display
  • Measures from of 1 m Torr to 3000 m Torr
  • Two relay output adjustable from the front panel
  • RS-232 serial interface
  • Analogue output for remote display/monitoring
  • Front panel LED’s for relay output status
  • Panel mountable or beach top use
  • Uses the rugged and proven GTC-036 senor

Principle of Operation

The GTC-395 gauge supplies a constant current source to the heating element of the GTC-036 sensor. The thermocouple junction in the sensor generates a voltage signal that varies with the temperature of this heating element. A decrease in pressure reduces the number of gas molecules available to transfer heat away from the heating element, resulting in a temperature rise and an increased output from the sensor. This signal is filtered and amplified, and then sent to an analog to digital converter. The microprocessor reads this signal, does further filtering and uses the result as an index into a lookup table for pressure. This value is written to the display and to a digital to analog converter that generates the analog voltage output. The set points are implemented in software and their values are stored in nonvolatile memory on the microprocessor.


Power Input: 100-120 VAC 50/60 Hz 40 watts or 9-12 VDC 6 watts
Pressures Scales: 1 mTorr to 3,000 mTorr with atmosphere indication of “ATM”
Number of Sensing Stations: One
Pressure Sensing Tube: Type GTC-036 with 1/8” pipe thread or 0.406” diameter O-Ring sealing surface.
Tube Cable: 10 ft length standard with both 9-pin gauge and octal sensor connector
Cabinet Dimensions: 3.78” wide 5.1” deep 1.89” high
Mounting Hole Dimensions: 3.64″ wide x 1.75” high (allow 8” for mounting depth)
Relay Connections: One removable six position terminal block with common, normally closed, normally open connections for each set point.
Relay Trip Points Adjustments: Entire range of gauge
Relay Types: SPDT 5 Amp 250 VAC Max
RS-232: RX, TX, and COM (9600 Baud)
Analog Output: 0-3 Volt, 1 mV per 1 mTorr (COM and OUT)

GTC-036 Tube Specifications

Ordering Information

GTC-395 – THERMOCOUPLE din panel mount with digital display dual set points scale indication from atmosphere to 0 torr with cable, less sensor – Part Number 500640-0010
GTC-395 – As above, complete with GTC036 sensor – Part Number 500640-0011
GTC 036 Sensor Tube (No Calibration required) – Part Number 5504358

Both Sensors attach to vacuum chamber with 1/8” pipe thread or 3/8” tubulation seal

Adapters available

  • KF-16 to 1/8″ FPT KF – Part Number 500230-16
  • KF-25 to 1/8″ FPT – Part Number 500230-25
  • KF-40 to 1/8″ FPT – Part Number 500230-40
  • KF-50 to 1/8″ FPT – Part Number 500230-50
  • CF-16 to 1/8″ FPT – Part Number 500231-1
  • CF-35 to 1/8″ FPT – Part Number 500231-2
  • 1″ hole mount to 1/8″ FPT – Part Number 500236
  • EXP Housing – Explosion Proof Housing Part Number 501065

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