Part Numbers: 2-8930-101, 2-8930-110, 2-8930-111, 2-8930-116, 2-8930-125, 2-8930-130 2-8930-131, 2-8930-132, 2-8930-150, 2-8930-152
Compatible With: MX Active Gauge EthernetIP Gateway
Features of the MX4A Vacuum Gauge
- 1E-3 to 1,000 Torr measurement range
- ±10% accuracy from 1E-2 to 1,000 Torr
- Analog 0 to 10 V DC output (configurable)
- RS-485 digital communications
- Switching set point outputs (configurable relay and open collector)
- Built-in color display
- Thermocouple/convection/Pirani technology
- 22 to 26 V DC supply voltage
- KF/NW, NPT, Conflat/CF, straight tube flanges and fittings
- DB15 electrical connector
- Friction fit sensor attachment for easy replacement
- 4 touch controls on top of the unit
- Vertical mounting required for accuracy above 1 Torr
Benefits of the MX4A Vacuum Gauge
- Low cost digital vacuum gauge
- Compact digital vacuum gauge
- ISO 17025 accredited and NIST traceable calibrations available
- Quick turn-around for calibration and service of vacuum gauges
- Excellent customer support for vacuum gauges
Summary of the MX4A Vacuum Gauge
The Televac® MX4A Active Vacuum Gauge uses a Televac® 4A convection vacuum gauge. It has a 1*10-3 to 1,000 Torr vacuum measurement range. It also has RS-485 communications, two adjustable set points, and a configurable 0 to 10 V DC analog output. This vacuum gauge is also sometimes called a Pirani vacuum gauge. Other names include digital vacuum gauge and analog vacuum gauge.
Additional Features
The bright color OLED display makes it easy to read from a distance. Settings on this gauge are configurable from four touch controls on the top of the unit. All features accessible through the front panel are also configurable through RS-485 communications. EthernetIP is also an option if you add an MX EthernetIP Gateway. This vacuum gauge is available with many flanges and fittings. These include KF/NW, NPT, Conflat/CF, and straight tube.
Electrical Information, Set Points, Overpressure, and Bakeout
The electrical connector is a D-Sub 15 (DB15) male. The vacuum gauge operates on 22 to 26 V DC with power draw up to 8 W (0.33 A). One of the set points is an electromechanical relay and the other is an open collector. These set point outputs are configurable to switch anywhere within the range of the gauge (1*10-3 to 1,000 Torr ). The gauge has an overpressure limit of 150 PSI. It is also rated for bakeout temperatures up to 200 °C (392 °F) with the electronics removed.
Certifications, Compliance, and Common Uses
This vacuum gauge is CE certified to EN 61010-1, EN 61326-1, and EN 55011. It also has CAN/CSA C22.2 No. 61010-1-12 and EAC certification, and is RoHS and REACH compliant. It is intended for use in any non-corrosive environment, and includes built-in gas correction factors. Common applications include vacuum furnaces, heat treat, thin film deposition, and many others.
MX4A Measurement Technology and Gas Dependence
The MX4A vacuum gauge measures pressure using thermal conductivity measurements from a filament. Heat loss from the heated filament correlates to pressure. Heat loss from the heated filament correlates to pressure. Different gases have different thermal conductivity characteristics. This means that MX4A measurements are gas dependent. The MX4A has built in gas correction factors for air, nitrogen, and argon.
Calibration
The MX4A comes with standard electrical factory calibration. NIST traceable and ISO/IEC 17025 accredited calibration is also available. You can request calibration of your gauge on our website here.
MX4A Convection Active Vacuum Gauge
D-Sub 15, 15 Conductor Cables (Flying Leads)
D-Sub 15, 6 Conductor Cables (Flying Leads)
Wall Power Supply
Replacement Sensors
| Operating Range | 1*10-4 Torr to 1000 Torr |
| Display | OLED |
| Digital Communications | RS-485 |
| Analog Output | Selectable 0 V DC to 10 V DC |
| Programmable Set Points | 2 |
| Set Point 1 | Open collector |
| Set Point 2 | Relay |
| Supply Voltage | 22 V DC 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 | |
| Brass (PN: -110, -116, -125) | 100 °C (electronics removed) |
| Stainless Steel (PN: All Others) | 200 °C (electronics removed) |
| Display Readable Distance | 3 m (10 ft) |
| Accuracy (Vertical Mount) | |
| 0.1 mTorr to 1 mTorr | 0.1 mTorr resolution |
| 1 mTorr to 10 mTorr | ±1 mTorr |
| 10 mTorr to 1000 Torr | ±10% of reading |
| Analog Output | ±10 mV |
| Pin | Description |
| 1 | Analog Out (Ground) |
| 2 | RS-485 A (-) |
| 3 | SP2 NC |
| 4 | SP2 NO |
| 5 | SP1 Open Drain |
| 6 | Floating |
| 7 | Floating |
| 8 | Supply Voltage (+) |
| 9 | Analog Out (0 to 10) V |
| 10 | RS-485 B (+) |
| 11 | SP2 Com |
| 12 | SP1 Source |
| 13 | Floating |
| 14 | Floating |
| 15 | Supply Voltage (-) |
| *0S1<CR> | Read vacuum measurement |
| *0R1<CR> | Read units of measurement |
| *0R2<CR> | Read SP1L and SP1H |
Assume address 0
Full list of commands is available in the instruction manual.
The MX4A has two set points. Set point 1 is an N-Channel 60 V MOSFET open collector. It has a maximum current rating of 1 A. The datasheet can be found at www.vishay.com/en/product/69958.
Set point 2 is a relay with a maximum switching voltage of 220 V DC (250 V AC) and a maximum switching current of 2 A. The datasheet can be found at www.te.com/catalog/pn/en/1393788-3.
| MX4A PN: -110, -116, -125 | MX4A PN: All Others |
| Nickel | Nickel |
| Glass | Glass |
| Gold | Gold |
| Tophet | Tophet |
| Cupron | Cupron |
| Solder | Stainless Steel |
| Housing | Aluminum |
| Electrical Connections | D-Sub 15-pin male |
| Weight with Sensor (typical) | 350 g (0.77 lbs) |
| Weight without Sensor | 200 g (0.44 lbs) |
| Certified to CAN/CSA C22.2 No. 61010-1-12 |
| CE certified to EN 61010-1, EN 61236-1, EN 55011 |
| RoHS compliant |
| IP40 |
| EAC certified |
| ISO 17025 accredited calibration optional |
| NIST traceable calibration optional |
Product Documentation
| MX4A Datasheet |
| MX4A Instruction Manual |
| Televac®️ Vacuum Calibration Tolerances |
3D Models (STEP Files)
| 2-8930-125 – MX4A NW25/KF25 Nickel-Plated Brass |
| 2-8930-131 – MX4A NW25/KF25 Stainless Steel |
| 2-8930-152 – MX4A CF40/2.75″ CF-F Stainless Steel |
Application Notes
Videos
| MX4A Product Overview Video |
| MX4A Demonstration Video |
| MX2A/MX4A Sensor Replacement Video |
Tools
| Televac® Vacuum Measurement Converter |
| Web Serial Terminal |
Case Studies
| Case Study: Argonne National Laboratory |
Brochures
| Televac®️ Vacuum Measurement Product Catalog |
| Full Range Solutions for Vacuum Furnaces Brochure |
MX4A Convection Active Vacuum
Gauge Quantity Discounts
| Quantity | Discount |
| 1 | List |
| 5 | 2% |
| 10 | 5% |
| 15 | 7% |
| 20 | 10% |
| 25 | 13% |
| 30+ | 15% |
D-Sub 15 Cable Quantity Discounts
| Quantity | Discount |
| 1 | List |
| 50 | 5% |
| 75 | 10% |
| 100+ | 15% |