Televac MX7B Cold Cathode


A digital vacuum gauge, the MX7B Active Gauge utilizes the well-known Televac 7B Penning cold cathode gauge to provide robust, contamination resistant, repeatable, and accurate vacuum measurement from 10-3 to 10-8 Torr. The sensor is also easily replaced and cleaned, saving you time and money. Other features include a multi-color OLED display, a configurable 0 to 10 V output indicating pressure, digital RS-485 and USB communications, and a set point relay and open collector for process control. A drop-in replacement for the Televac MP7ER, the MX7B can be combined with an MX2A or MX4A active vacuum gauges to provide full range measurement from atmosphere (760 Torr) to 10-8 Torr.

The Televac MX7B Features

  • Low cost with a compact design and color OLED display
  • Reliable Penning magnetron cold cathode technology
  • Easily cleaned for extended sensor lifetime
  • Excellent customer service and support
  • Rapid turn-around for calibration and service
  • Designed and manufactured in the USA
Operating Specifications
Operating Range 1 × 10-8 Torr to 1 × 10-3 Torr
Display OLED
Digital Communications RS-485, USB (micro)
Analog Output Configurable 0 to 10 V DC
Programmable Set Points 2
Set Point 1 Open collector
Set Point 2 Relay
Supply Voltage 22 V to 26 V DC
Maximum Power 8 W
Calibration Medium Dry air or nitrogen
Overpressure 150 psi
Digital Output Resolution 3 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 120 °C
Response Time ≤ 150 ms
1×10-7 to 1×10-3 Torr ±30% of reading
Analog Output ±10 mV
Display Readable Distance 3 m (10 ft)
Physical Characteristics
Enclosure Aluminum
Weight with Sensor 1 kg (2 lbs)
Weight without Sensor 0.3 kg (0.6 lbs)
Dimensions See dimensional drawing
MX7B Active Gauge Part Number
NW25 (DN25 ISO-KF) Stainless Steel 2-8940-KF25
¾” NPT Brass 2-8940-NPT
Replacement Sensors Part Number
NW25 (DN25 ISO-KF) Stainless Steel 2-2171-KF25
¾” NPT Brass 2-2171-NPT
D-Sub 15 Pin Cable (flying leads) Part Number
20 ft (6 m) 2-9858-020
50 ft (15 m) 2-9858-050
100 ft (30 m) 2-9858-000
D-Sub 6 Pin Cable (flying leads) Part Number
20 ft (6 m) 2-9873-020
50 ft (15 m) 2-9873-050
100 ft (30 m) 2-9873-100
Wall Power Supply Part Number
Type A, C, G, I; 100-240 V AC/47-63 Hz 2-7900-097
Name Operating Range Part Number
MX2A 1×10-4 to 1000 Torr 2-8910-1XX
MX4A 1×10-4 to 1000 Torr 2-8930-1XX
MX EthernetIP Gateway  1×10-11 to 1000 Torr 2-8900-100
Heat treatment and vacuum furnaces
Thin film deposition and coating processes

Televac MX7B Cold Cathode Active Gauge