Small Diameter Vacuum Gauges
- Measuring range
- 0 to −1 bar gauge
- Pressure reference
- Relative to atmosphere
- Dial diameter
- 40, 50, 63 or 80 mm
Leybold COMBIVAC CM 51 Vacuum Gauge Controller
The COMBIVAC CM 51 is a controller for passive vacuum sensor heads. It combines two THERMOVAC Pirani channels with one PENNINGVAC cold-cathode channel for rough-to-high-vacuum measurement.
Manufacturer photograph of COMBIVAC CM 52, illustrating the CM 51/52 family; rear sensor connections differ between models.
Part of the Leybold GRAPHIX and COMBIVAC controllers family. Compare the range and other model options.
- Measurement channels
- 2 passive THERMOVAC + 1 passive PENNINGVAC
- Compatible Pirani heads
- TR 211, TR 212, TR 216
- Compatible high-vacuum heads
- PR 25, PR 26, PR 27, PR 28
- Pirani channel range
- 5 × 10⁻⁴–1000 mbar
Price and availability
Tell us the configuration and quantity you need. Include your process requirements if you would like help with selection.
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Choosing the COMBIVAC CM 51
The COMBIVAC CM 51 is a controller for passive vacuum sensor heads. It combines two THERMOVAC Pirani channels with one PENNINGVAC cold-cathode channel for rough-to-high-vacuum measurement.
Key specifications
| Measurement channels | 2 passive THERMOVAC + 1 passive PENNINGVAC |
|---|---|
| Compatible Pirani heads | TR 211, TR 212, TR 216 |
| Compatible high-vacuum heads | PR 25, PR 26, PR 27, PR 28 |
| Pirani channel range | 5 × 10⁻⁴–1000 mbar |
| High-vacuum channel range | 1 × 10⁻⁹–1 × 10⁻² mbar |
| Switching functions | 6 relays, 2 per channel |
| Relay contact rating | Maximum 1 A and 30 V AC / 30 V DC, resistive load |
| Interface options | RS232 / RS485; separate Profibus-equipped order code |
| Mains supply | 100–240 V AC, 50/60 Hz; IEC C14 inlet |
| Power consumption | <10 W |
| Dimensions (W × H × D) | 106.4 × 128.4 × 174.5 mm; check connected installation envelope |
| Protection rating | IP40 |
Passive heads are a distinct system
COMBIVAC supplies and evaluates the documented passive sensor heads through their dedicated cables. An active TTR, PTR or ITR transmitter is not a direct substitute for the TR, PR or IE head. Identify the complete head and controller part numbers when replacing installed equipment. For active transmitters, compare GRAPHIX controllers.
CM 51 uses THERMOVAC TR heads for rough vacuum and a PENNINGVAC PR head for high vacuum. The low-pressure channel has its own operating and accuracy conditions; it is not an atmospheric-pressure channel.
Outputs and configuration choices
Use two switching functions per channel, analogue recorder outputs and the selected serial/fieldbus interface to monitor the system. Check the switching range and relay loading against the manual. The documented controller order references are 230110 (RS232/RS485) and 230111 (Profibus-equipped). Gauges and their cables must be specified separately.
UK mains supply and installation
The controller accepts 100–240 V AC at 50/60 Hz. Request the correct UK 230 V mains lead: the brochure lists EURO and US cables in its package description. Allow for rear connectors and cable routing; the manual installation depth is approximately 230 mm. Bench, rack and front-panel installation are documented. Confirm any mounting hardware on the quotation.
Compare COMBIVAC CM 52 when choosing between passive hot-cathode and cold-cathode measurement systems.
Manufacturer image and installation information
Manufacturer downloads
Specification references: GA130001441_002_C1, pp11–16, August 2017; COMBIVAC brochure 3610 0210 02. Use the instructions matching the supplied part number and revision.
Specify your measurement system
For a COMBIVAC CM 51 quotation, send the required pressure range and units, process gas and vapours, connection, ambient and bakeout conditions, output or communication protocol, cable length and quantity. Include the existing gauge/controller part numbers, required switching functions, power supply and calibration test points. Girovac will confirm the configuration, included equipment, price and availability.
Browse vacuum gauges and instrumentation, compare controller options or request gauge calibration support.
Specifications
| Manufacturer | LEYBOLD |
|---|---|
| Equipment type | Vacuum gauges & instrumentation |
| Measurement channels | 2 passive THERMOVAC + 1 passive PENNINGVAC |
| Compatible Pirani heads | TR 211, TR 212, TR 216 |
| Compatible high-vacuum heads | PR 25, PR 26, PR 27, PR 28 |
| Pirani channel range | 5 × 10⁻⁴–1000 mbar |
| High-vacuum channel range | 1 × 10⁻⁹–1 × 10⁻² mbar |
| Switching functions | 6 relays, 2 per channel |
| Relay contact rating | Maximum 1 A and 30 V AC / 30 V DC, resistive load |
| Interface options | RS232 / RS485; separate Profibus-equipped order code |
| Mains supply | 100–240 V AC, 50/60 Hz; IEC C14 inlet |
| Power consumption | <10 W |
| Dimensions (W × H × D) | 106.4 × 128.4 × 174.5 mm; check connected installation envelope |
| Protection rating | IP40 |
Calibration and instrument support
Send the gauge model, pressure range and process details for calibration, replacement or compatibility advice.
Before you order
Confirm the range, pressure reference, connection, electrical output and whether cables, a controller or calibration are included.
Availability, lead time and the applicable warranty are confirmed for your quotation. A catalogue listing does not reserve stock.
What to check in your quotation · Delivery · Returns and faults
Enquire about this product
Leybold COMBIVAC CM 51 Vacuum Gauge Controller
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Related equipment
Portable Digital Vacuum Meters & Data Loggers
- Measurement
- Absolute pressure; selected newer models also offer relative measurement
- Compact piezo version
- 1600–1 mbar absolute
- Compact Pirani version
- 100–0.0005 mbar absolute
Hot Cathode / Pirani Ultra-high Vacuum Gauges
- Measurement principle
- Pirani and Bayard–Alpert; gas-dependent
- Measuring range
- 1000 to 5 × 10⁻¹⁰ mbar
- Pressure reference
- Absolute
LEYBOLD
Leybold PENNINGVAC PTR 225 RN Vacuum Gauge
- Measurement principle
- Inverted-magnetron cold cathode
- Pressure range
- 1 × 10⁻⁹–1 × 10⁻² mbar
- Vacuum connection
- DN25 KF, DN40 KF or DN40 CF
Compare selected equipment
Compare the stated conditions as well as the values. A missing specification is not a zero rating; confirm suitability with Girovac.