Instruction Manual
MX7M Active Gauge
2.6 Explanation of Menu Items and Navigation
Below is a general explanation of each level of the MX7M menu structure.
2.6.1 Measurement Screen
The measurement screen contains the reading of the sensor in easy-to-read blue digits and includes
units. In addition to the digital reading, the yellow bar on the measurement screen provides an analog
indication of the pressure based on a logarithmic scale. At 1
×
10
−
2
Torr the yellow bar should stretch
across the width of the screen. At 5
×
10
−
11
Torr the yellow bar will disappear, and at 7
×
10
−
7
Torr,
the yellow bar will be approximately half way across the screen.
The sensor high voltage must be turned on to display a reading. If the high voltage is not on, the
measurement screen will display "OFF". When the high voltage is toggled on, the unit will display
"Starting" until the unit has reached a steady measurement. Once a steady measurement is obtained,
it will be displayed. If the unit goes into overcurrent protection mode, the display will read "Over". If
Pin Control is enabled, the unit will attempt to start every 60 seconds. If overcurrect protection mode
continues upon an attempted start, the unit will continue to read "Over". If Menu Control is enabled,
the unit will display "OFF" and the high voltage will need to be turned on again. See 2.3 for more
details. If the high voltage is enabled and the pressure is below 5
×
10
−
11
Torr, then the unit will
display "Low" to indicate that the pressure is below the measurable limit.
2.6.2 High Voltage Toggle
If the unit is in Menu Control Mode, then the user must turn on the high voltage by sending a command
over communications or by navigating to the High Voltage Toggle menu screen. Once at the High
Voltage Toggle screen, press ENT to unlock the screen, press UP or DOWN to change the setting, and
then press ENT to save the change. The high voltage will then turn on and a pressure indication will
be displayed on the Measurement Screen. If the pressure is too high, the unit will go into overcurrent
protection mode and the high voltage will turn off. To restart the unit once a safe pressure has been
achieved at the gauge, simply repeat the steps to turn on the high voltage.
2.6.3 System Settings
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.
To modify the system settings:
Navigate to the measurement screen.
Press SEL twice.
Press UP and DOWN arrows to navigate between panes under the system settings heading.
Press ENT to unlock the specific screen. ADJ will appear at the top of screen to show that the
unit is unlocked and that a change can be made.
Press UP or DOWN to select between the options available.
Press ENT to save the changes or SEL to navigate away without saving. ADJ will disappear from
the screen after either ENT or SEL has been pressed.
A
.
Units
The MX7M has three selectable units to choose from: Torr, mbar, and kPa. When changing units,
all of the relevant settings previously saved in the unit will be converted to the appropriate units.
email: [email protected]
tel: +1 215 947 2500
web: frederickscompany.com
mx7m_im rev C
9 of 23
