Related Manuals for TELEVAC MX7M
Summary of Contents for TELEVAC MX7M
- Page 1 MX7M Cold Cathode Ionization Gauge Instruction Manual The Fredericks Company - Televac 2400 Philmont Avenue Huntingdon Valley, PA 19006 email: sales@frederickscompany.com tel: +1 215 947 2500 fax: +1 215 947 7464...
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Page 2: Table Of Contents
Cleaning the MX7M Sensor ........ -
Page 3: Introduction
PC, through USB communications with a PC, or through the unit’s front panel using four capacitive touch buttons located on the top of the unit. The MX7M has two set points, one relay and one open collector, and a selectable analog output option. The analog output is a configurable 0-10 V output that includes options for linear, linear-by-decade, and logarithmic formats. -
Page 4: Dimensions
Instruction Manual MX7M Active Gauge 1.4 Dimensions Figure 1: MX7M Dimensional Drawing email: sales@frederickscompany.com tel: +1 215 947 2500 web: frederickscompany.com mx7m_im rev C 3 of 23... -
Page 5: Safety Information
The MX7M has voltages up to 4500 volts. As such, it represents a shock hazard and should be handled with caution. Any disassembly of the gauge should be carried out by a trained professional and with the power disconnected. -
Page 6: Quick Start Guide
2 Setup 2.1 Installation Each MX7M is designed to be used in conjunction with a 7M sensor. The 7M sensor can be mounted in any position however it is recommended to mount it away from any contaminants that might be in the system as over time this can affect the measurement accuracy. -
Page 7: Turning The High Voltage On And Off
13 and 14. This functionality is included to easily interface with a low vacuum gauge, such as the Televac MX2A or MX4A, to automatically control the unit via an open collector or relay. Contact Televac Sales for more information or see Application Note 3022. -
Page 8: Menu Navigation
RS-485 or USB communications. To navigate the menu simply use the buttons found on top of the MX7M . 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 9 Instruction Manual MX7M Active Gauge (e) Analog Output Adjustment 5. Set Points (a) SP1 Off (b) SP1 On (c) SP2 Off (d) SP2 On 6. Output (a) Analog Output i. Linear A. 10 V Pressure B. 0 V Pressure (Non-settable) ii.
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Page 10: Explanation Of Menu Items And Navigation
The system settings menu contains the ability to change the measurement units, apply a gas correc- tion factor, change the digital resolution to display an extra digit, and set the Vsense Control method for the unit. There is also a diagnostic screen for use by Televac service representatives to trou- bleshoot the unit. -
Page 11: Gas Conversion Factors
MX7M Active Gauge B. Gas Type The MX7M is an indirect pressure sensor and its accuracy will be effected by the presence of gases other than nitrogen. The MX7M has the ability to apply correction factors for six pre- defined gases: hydrogen, helium, neon, argon, krypton, and carbon dioxide. These correction factors have been experimentally determined by Televac to yield the maximum accuracy avail- able. - Page 12 2.6.5 Set Points The MX7M 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/si2308bds.pdf.
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Page 13: Analog Output
The formats include Logarithmic, Linear by Decade, Linear by Decade 7F, and Linear. A. Linear The Linear output covers a select range of the MX7M with a linear scale. The 10 Volt or full-scale value of the output can be selected from the following values: 1 Torr, 1 Torr, or Torr. - Page 14 B. Linear by Decade The Linear by Decade output spans the MX7M measurement range. It uses the units digit of the voltage reading to communicate the decade of the pressure reading and the units after...
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Page 15: Graph Of Mx7M Sample Analog Output Functions
0 V exponent selection screen. Press ENT to unlock the screen and the UP or DOWN arrow to select the 0 V value. Figure 3: Graph of MX7M Sample Analog Output Functions email: sales@frederickscompany.com tel: +1 215 947 2500 web: frederickscompany.com... -
Page 16: Cleaning The Mx7M Sensor
2. Remove the six bolts from the top of the unit. These require a 7/64 Allen wrench. 3. The MX7M ships by default with a copper gasket to allow customers to use the full range of the MX7M . Any standard CF16 gasket will work with the MX7M . Once the bolts are removed, the used copper gasket can be pulled free and discarded. -
Page 17: Cross-Sectional Diagram Of The 7M Sensor
Instruction Manual MX7M Active Gauge Figure 4: Cross-sectional Diagram of the 7M Sensor email: sales@frederickscompany.com tel: +1 215 947 2500 web: frederickscompany.com mx7m_im rev C 16 of 23... -
Page 18: Rs-485 And Usb Communications
To communicate with the MX7M via USB, the user must have a USB capable device to send commands to the MX7M . Each command must be preceded by a * and will be an S, R, W, RC, or WC. Because USB is a serial bus, the unit address is omitted from commands. -
Page 19: Rs-485 And Usb Command List
Instruction Manual MX7M Active Gauge 3.3 RS-485 and USB Command List Table 6: RS-485 and USB General Read Commands Command Response Description Read units, where xx is: PA = Pa TR = Torr MB = mbar Read resolution, where xx is:... -
Page 20: Rs-485 And Usb General Write Commands
Instruction Manual MX7M Active Gauge Table 7: RS-485 and USB General Write Commands Command Response Description W1xx Set units, where xx is: PA = Pa TR = Torr MB = mbar Toggle resolution, where xx is: LO = low HI = high... -
Page 21: Rs-485 And Usb Set Point Commands
Instruction Manual MX7M Active Gauge Table 8: RS-485 and USB Set Point Commands Command Response Description Read 1E-6 calibration adjustment where x is: 0=negative 1=positive yy can be 00 to 99 Read 1E-5 calibration adjustment Read 1E-4 calibration adjustment Read 1E-3 calibration adjustment... -
Page 22: Rs-485 Sample Commands
Instruction Manual MX7M Active Gauge 3.4 RS-485 Sample Commands Table 10: RS-485 Command Examples Command Output Description *0R1<CR> 0001 Units are in Pa 0002 Units in Torr 0003 Units in mbar *0R2<CR> ppseePPSEE Lower set point 1 given by ppsee Upper set point 1 given by PPSEE *0R3<CR>... -
Page 23: Usb Sample Commands
Instruction Manual MX7M Active Gauge 3.5 USB Sample Commands Note that all USB commands are the same as the RS-485 commands with the star and address prefix omitted. Table 11: USB Command Examples Command Output Description R1<CR> 0001 Units are in Pa... -
Page 24: Rs-485 And Usb Communications Error Codes
= month dd = day 3.7 Firmware Updates The MX7M has the ability to update the firmware when in the field over the USB communications. For more information on updating the firmware, please contact sales@frederickscompany.com. email: sales@frederickscompany.com tel: +1 215 947 2500 web: frederickscompany.com...