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1.
Introduction
1.1
Disclaimer
1.1.1
All information in this manual is subject to change without notice. The Fredericks Company
assumes no responsibility for inaccuracies in product specifications or any liability arising from
product use. Please contact Televac® at
with comments or questions.
1.2
Description
1.2.1
The MX7B is cold cathode ionization gauge with a measurement range of 1*10
−
8
Torr to 1*10
−
3
Torr. It utilizes a Televac® cold cathode ionization sensor in the Penning configuration with part
numbers 2-2171-KF25 (KF25 flange version) or 2-2171-NPT (3/4 NPT version). It has a two-color
OLED display with selectable units of Torr, Millibar, and Kilopascal. Settings can be changed
through RS-485 communications with a 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
MX7B has 2 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.
1.3
Specifications
Operating Range
1*10
−
8
to 1*10
−
3
Torr
Communications
RS-485 and USB
Programmable Set Points
2
Set Point 1
Open Collector
Set Point 2
Relay
Analog Output
Configurable 0 to 10 V DC
Supply Voltage
+22 to +26 V DC
Maximum Power
8 W
Calibration Medium
Dry air or nitrogen
Overpressure
150 PSI
Digital Output Resolution
2 significant digits with exponent
Analog Output Resolution
16 bits
Operating Temperature
0 °C to 50 °C
Storage Temperature
-20 °C to 60 °C
Bakeout Temperature
100° C (electronics removed)
Response Time
≤ 1 second
Accuracy
1*10
-9
to 1*10
-3
Torr
±30%
Analog Output
± 10 mV
Display Readable Distance
3 m (10 feet)
