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Related Manuals for TELEVAC MX2A
Summary of Contents for TELEVAC MX2A
- Page 1 The Fredericks Company MX2A Active Thermocouple 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 MX2A Gas Dependence ........ -
Page 3: Introduction
PC or on the unit using four capacitive touch buttons located on the top of the unit. The MX2A 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 MX2A Active Thermocouple 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 MX2A 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 MX2A is designed to be used in conjunction with a 2A sensor. The 2A sensor can be mounted in any orientation for accurate measurement up to 10 Torr. For measurements up to atmosphere, mount the 2A sensor in an upright position. The sensor should be mounted close to the area where vacuum measurement is desired. -
Page 7: Menu Navigation
RS-485 communications. To navigate the menu simply use the buttons found on top of the MX2A. 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: Menu Structure
Instruction Manual MX2A Active Thermocouple Gauge 2.4 Menu Structure 1. Measurement 2. Calibration (a) Vacuum (b) 10 Torr (c) Atmosphere (d) Resolution High/Low (e) Default (f) Diagnostic (g) Analog Output Adjustment (h) Gas Type 3. Set Points (a) SP1L (b) SP1H... -
Page 9: Calibration
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 MX2A includes a number of operator-configurable calibration points. While the MX2A is factory calibrated, the use of the included calibration points may become necessary after extended use, contamination, etc. - Page 10 ˆ When the desired reading is reached, press ENT to save and lock the change. The resolution of the MX2A is set to low by default. Under this setting the resolution is determined by the accuracy of the gauge. The gauge will automatically adjust the resolution based on the pressure.
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Page 11: Set Points
The 2A sensor exhibits different sensitivities to different gases. The default gas is set to air. Air and dry nitrogen are approximated to have the same sensitivity and using either does not require any compensation. For users who wish to measure the pressure of Argon gas, the MX2A includes an Argon correction option. -
Page 12: Units
Depending on the process or the region, the desired units for the MX2A may vary. To accommodate this need, the MX2A includes a unit adjustment feature. The MX2A can be set to display the units in Torr, kPa, or mbar. -
Page 13: Analog Output
.07 Torr B. Linear by Decade The Linear by decade output spans the entire range of the MX2A. It uses the units digit of the voltage reading to communicate the decade of the pressure reading and the units after the decimal to communicate the specific pressure using the very generalized expression below,... -
Page 14: Graph Of Analog Output Functions Available On The Mx2A
D. Linear 4 The Linear 4 output is one of four linear outputs that cover a select range of the MX2A 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 15: Rs-485 Communications
To communicate with the MX2A via RS-485, the user must have an RS-485 capable device to send commands to the MX2A. 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 MX2A. -
Page 16: Rs-485 Command List
Instruction Manual MX2A Active Thermocouple Gauge 3.3 RS-485 Command List Table 3: RS-485 Commands Command Description Read units Read SP1L and SP1H Read SP2L and SP2H Set pressure units Set SP1L,SP1H Set SP2L,SP2H Set gas type Read pressure data Read vacuum adjustment... -
Page 17: Rs-485 Sample Commands
Instruction Manual MX2A Active Thermocouple Gauge 3.4 RS-485 Sample Commands Table 4: RS-485 Commands 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 18: Rs-485 Error Codes
Instruction Manual MX2A Active Thermocouple Gauge Table 6: Examples for ppse, PPSE, and Baaa Letters Description ppse=2412 Pressure = 2.4 ppse=8703 Pressure = 8.7 PPSE=3402 Pressure = 3.4 PPSE=5211 Pressure = 5.2 Baaa=0249 Adjustment = -249 Baaa=1382 Adjustment = 382 3.5 RS-485 Error Codes...
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