GTC-395 Thermocouple
Digital Display

GTC-395 Product Manual click to download Note: Requires the Adobe Acrobat Reader.

Features

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

Description

The GTC-395 thermocouple vacuum gauge is a microprocessor controlled 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.

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.

 

SPECIFICATIONS
ITEM	DESCRIPTION
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: http://www.myers-vacuum.com/gtc036.shtml

To change the combination for ordering the first dash number is always –0 the second dash is always-00, the third dash number determines the connector cable and its length ,-0000= no cable -0010 = 10’ connector cable, -0020 = 15’ connector cable, -0030 =25’ connector cable, -0040 =50’ connector cable and the fourth dash number indicates with or without sensor (zero or one).