GT-430 Thermistor
Digital Display with Trend Sensing^TM technology

The 430 THERMISTOR GAUGE reads from atmosphere to 1 X 10^-3 Torr plus Trend Sensing^TM, a unique feature that allows the user to see which direction the pressure is going.

GT-430 Product Manual click to download Note: Requires the Adobe Acrobat Reader.

Features

• Measures from atmosphere to 1 X 10^-3 torr
• NO mounting restrictions of sensor (as with Convectron Gauges)
• Trend Sensing^TM shows direction of pressure change
• Easy to read pressure display
• Two adjustable independent relay outputs
• LED indication of Pressure range, set point indication/set value and status
• RS-232 serial interface
• Analogue output (0-3 volts) for remote display/monitoring
• Leak detection function over vacuum range
• Front panel LED’s for relay output status
• Panel mountable (1/8 DIN) or bench top use
• Uses GT-034 sensor
  

Description
The GT-430 thermistor vacuum gauge is a digital single station gauge for use in harsh environments. It incorporates Trend Sensing^TM technology that indicates which direction pressure is going. Trend Sensing^TM enhances vacuum leak detection capabilities. The controller is housed in a 1/8 DIN-style case. The unit uses the rugged and proven GT-034 thermistor sensor and covers a pressure range of 1 X 10^-3 Torr to atmosphere. Pressure is displayed 4 digit monitor with torr and millitorr indicators. A nine segmented bar graph displays pressure direction. This segmented display provides high sensitivity that it can be used for vacuum leak detection with a solvent. The relay set point for each station may be viewed by pressing the “View” buttons on the front panel. 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
A single resistor element is employed in a bridge-type detector driven from a constant regulated power source. The inverse resistive characteristics of the sensor unbalances the bridge as pressure changes occur, thereby causing a current change. A microprocessor scales the changes into pressure units. Trend Sensing^TM electronics enhances the sensitivity of each range by displaying the rate of change of the pressure on a separate bar graph.

Leak Detection
Trend Sensing^TM technology puts the gauge in constant Leak Detect Mode. Front panel Bar graph high sensitivity indicates to vacuum pressure changes. The bar graph will give quick feedback when the pressure makes a rapid change.

GT-034 Tube Specifications http://www.myers-vacuum.com/gt034.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).