Model CVT-26A |
Model DCVT-6 |
Teledyne Hastings Instruments manufactured several variations of the dependable model CVT vacuum controller for multiple decades. While they are obsolete now, a replacement is available. In most cases, the current model DCVT can fulfill the functions of your CVT.
The CVT was more than a basic vacuum gauge. It was a vacuum controller with setpoints and relays. You could use it to control a pump, a valve, an alarm, an indicator light, or almost any electrical device. The DCVT is also a vacuum controller, but it offers many more features. While the DCVT is dimensionally different and does look quite different, it still uses the same Teledyne Hastings Instruments’ DV Series thermocouple gauge tubes as the CVT. Whether you are using DV-4, DV-5, or DV-6 Series thermocouple gauge tubes, they will all work with the DCVT.
The following sections will assist you in replacing your CVT with the DCVT.
Choose the appropriate gauge:
To choose the appropriate gauge, select the one that corresponds to your thermocouple gauge tube series. Most are color coded for quick identification.
Series | Color Code | Nominal Range | Obsolete CVT Models | DCVT Model |
DV-4 | Purple | 20 Torr | CVT-14, CVT-24 or CVT-24A | DCVT-4 |
DV-5 | Red | 100 mTorr | CVT-15A or CVT-25A | DCVT-5 |
DV-6 | Yellow | 1,000 mTorr | CVT-16, CVT-26 or CVT-26A | DCVT-6 |
Dial Face vs Digital Display:
The obvious difference between the CVT and DCVT are their displays. The CVT provided a dial-face with needle movement. Some users liked to see the needle movement because the movement rate gave them a feel for their vacuum system’s performance. It also provided a quick-read indication when looking from across a room. While the DCVT does not have the dial-face and needle, it does provide a bright and easy-to-read digital display. The DCVT setpoints for the relays are still accessible from the front panel just as they were on the CVT.
Dimensions:
Can you fit a square peg in a round hole? For panel mounted gauges, it’s not as difficult as it sounds. If your CVT was panel mounted, you will likely choose to fabricate a new panel or an adapter panel. If you had the gauge resting on a tabletop, it won’t be an issue.
Output Signal / Communication:
The DCVT offers the exact same nonlinear 0-1vdc output curve that was standard on the CVT. In addition, the DCVT offers optional output signals of 0-1vdc linear, 0-5vdc linear, 0-10vdc linear, 4-20mA linear, and 0-20 mA linear.
The DCVT also provides RS232 communication. A certified LabVIEW driver is available.
Terminal Strip Comparison:
The terminal strips look different, but all CVT connections are available on the DCVT. It also gives you the choice of AC input power or DC input power.
Common Applications:
Common Applications for the DCVT (and obsolete CVT) include Vacuum Metallurgy, Vacuum Coating, Vacuum Furnace, Refrigeration (HVAC), Freeze Drying, Lighting Manufacturing, Power/Transformer Maintenance, Cryogenic/Vacuum Insulation, and more.
To learn more about the Teledyne Hastings Instruments Model DCVT Vacuum Controller, visit https://www.teledyne-hi.com/en-us/What-we-do_/Documents/Bulletins/PB-182_Digital%20CVT%20%26%20VT.pdf
If you have questions about vacuum gauges or vacuum controllers, feel free to contact us by phone (+1-757-723-6531 or 1-800-950-2468), email Hastings_Instruments@Teledyne.com, or via Live Chat on our website www.teledyne-hi.com.