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Related Manuals for TELEVAC MX4A
Summary of Contents for TELEVAC MX4A
- Page 1 The Fredericks Company MX4A Active Convection Gauge Instruction Manual The Fredericks Company - Televac 2400 Philmont Avenue Huntingdon Valley, PA 19006 web: www.frederickscompany.com email: sales@frederickscompany.com tel: +1 215 947 2500 fax: +1 215 947 7464...
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Page 2: Table Of Contents
Graph of MX4A Gas Dependence ........ -
Page 3: Introduction
Torr, Millibar, and Kilopascal. Settings can be changed through RS-485 communications with a PC or on the unit using four capacitive touch buttons located on the top of the unit. The MX4A has 2 set points, one relay and one open collector, and a selectable analog output option. The analog output has a variety of options including four linear outputs, linear by decade, logarithmic, and non-linear. -
Page 4: Operating Specifications
Instruction Manual MX4A Active Convection Gauge 1.3 Operating Specifications Table 1: Operating Specifications Operating Range to 1000 Torr Communications RS-485 Programmable Set Points Set Point 1 Open Collector Set Point 2 Relay Analog Output 7 selectable 0 to 10 V... -
Page 5: Dimensions
START BY READING THESE IMPORTANT SAFETY INSTRUCTIONS AND NOTES In these instructions the word “product” refers to the MX4A and all of its approved parts and acces- sories. NOTE: These instructions do not and cannot provide for every contingency that may arise in connection with the installation, operation, or maintenance of this product. -
Page 6: Setup
2 Setup 2.1 Installation Each MX4A is designed to be used in conjunction with a 4A sensor. Mount the 4A sensor in an upright position and as close to the area where vacuum measurement is desired. Failure to mount the 4A sensor in a vertical position will decrease the accuracy of the measurement above 10 Torr. -
Page 7: Menu Navigation
RS-485 communications. To navigate the menu simply use the buttons found on top of the MX4A. The four buttons include the SEL button, an UP arrow, a DOWN arrow, and an ENT button. Using the SEL button allows the operator to change between menu categories. Using the ENT button allows the user to enable value editing and save values in addition to toggling between options where appropriate. -
Page 8: Explanation Of Menu Items And Navigation
ˆ Press the UP and DOWN arrows to navigate between panes under the calibration heading. To ensure that the unit always displays with the most accuracy, the MX4A includes a number of operator-configurable calibration points. While the MX4A is factory calibrated, the use of the included calibration points may become necessary after extended use, contamination, etc. - Page 9 The 70 Torr calibration point allows the gauge to adjust the pressure reading at 70 Torr. This should be used only when the operator is able to compare the MX4A to a reference gauge that is NIST calibrated and reading near 70 Torr.
- Page 10 When making this adjustment use a calibrated voltmeter to measure the analog output voltage when the MX4A is at a very stable pressure. Compare this voltage reading to the expected voltage. The expected voltage can be determined based on the formulae in the section of this manual entitled Analog Output.
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Page 11: Set Points
ˆ When the desired reading is reached, press ENT to save and lock the change. The MX4A contains two set points for the convenience of the operator. Set point 1 is an N-Channel 60 V MOSFET open collector. It has a maximum current rating of 1 A. The data sheet can be found at www.vishay.com/docs/69958/si2308bd.pdf. -
Page 12: Output
Depending on the process or the region, the desired units for the MX4A may vary. To accommodate this need, the MX4A includes a unit adjustment feature. The MX4A can be set to display the units in Torr, kPa, or mbar. -
Page 13: Analog Output
D. Linear 4 The Linear 4 output is one of four linear outputs that cover a select range of the MX4A with a lin- ear scale. The scale extends from .001 to 1 Torr, with each .010 Volt of the output corresponding to .001 Torr. -
Page 14: Rs-485 Communications
To communicate with the MX4A via RS-485, the user must have an RS-485 capable device to send commands to the MX4A. Each command must be preceded by a * and will be an S, R, W, RC, or WC. See the Communications Specifications heading for information on what settings are necessary to properly communicate with the MX4A. -
Page 15: Communications Specifications
Instruction Manual MX4A Active Convection Gauge 3.2 Communications Specifications Table 2: RS-485 Communication Specifications Interface RS-485 compatible Data Transfer Method Synchronous/half duplicate method Baud Rate 1200/4800/9600/19200/38400 Default Data Format 1 start bit, 8 data bits, 0 parity bits, 1 stop bit... -
Page 16: Rs-485 Sample Commands
Instruction Manual MX4A Active Convection Gauge 3.4 RS-485 Sample Commands Table 4: RS-485 Command Examples Command Output Description *0R1<CR> 0001 Units are in Pa 0002 Units in Torr 0003 Units in mbar *0R2<CR> ppsePPSE Lower set point 1 given by ppse Upper set point 1 given by PPSE *0R3<CR>... -
Page 17: Rs-485 Error Codes
Instruction Manual MX4A Active Convection Gauge Table 5: Understanding the Sample Commands: ppse, PPSE, and Baaa Letters Description Mantissa of pressure Sign of exponent (0 is negative and 1 is positive) Exponent of pressure Mantissa of pressure Sign of exponent (0 is negative and 1 is positive)