VD84 – Evacuation & Charging of Cooling Systems
Compact Vacuum Meter ● external Pirani ● 100 to 1e-3 mbar
The versatile VD84 digital Pirani vacuum meter with external, exchangeable sensor head (VSP841 or VSP842) reads absolute pressure in the fine vacuum range. It is equipped with USB interface and can be used as data logger.
Refrigerators, air conditioners and cooling machines operate according to a thermodynamic cycle process, in which heat is transferred from the cooling cabinet to a warmer surrounding.
Challenge
As transport medium fort he heat a refrigerant is used inside the closed cycle cooling system. Before this cooling system is filled or when it is to be refilled after maintenance work it first has to be completely evacuated to approx. 10-3 mbar, so that no rest of air or air humidity remains in the system. This would reduce the capability of the appliance and may even lead to serious damage of the cooling system. Further care must be taken thet there are no leaks in the system. Therefore the vacuum level which is reached after evacuation has to be checked accurately
Solution
Compact vacuum meters of type VD84/2 with external Pirani sensor measure the vacuum inside the cooling system with appropriate accuracy and resolution. The handy gauges are easy to operate and are optimal for use in the service and maintenance. Via an USB interface the measurements can be stored and analyzed on a PC.
Benefits at a Glance
| Weight | 1.1 kg |
|---|---|
| Dimensions | 25 x 16 x 9 cm |
| Measurement principle | Heat conduction Pirani |
| Gas dependency | depending on gas type |
| Measurement range mbar | 100 – 1e-3 mbar |
| Measurement range Torr | 75 – 1e-3 Torr |
| max. overload | 4 bar abs. |
| Accuracy | 100 – 20 mbar: |
| Resolution | 100 – 10 mbar: 1 mbar | |
| Measurement rate | 1.0 s |
| Logging rate | 1 … 6000 s |
| Materials in contact with vacuum | Stainless steel 1.4307, tungsten, nickel, glass |
| Operating temperature | +5…+50 °C |
| Storage temperature | -20…+60 °C |
| Voltage supply | 9 V battery or 12…15 VDC external |
| Power consumption | Approx. 110 mW (clocked) |
| Operating time | Li-battery: |
| Serial interface | Mini-USB, Type B, 5pin, female, Virtual Com Port protocol |
| Electrical connection | Mini-jack 2.5 mm for plug-in power supply |
| Article Number (choice of vacuum connection): | 1/8″ NPT male thread (VD84/2), DN 16 ISO-KF (VD84/1) |
| Display | LCD 12 mm |
| Dimensions | 60 x 120 x 25 mm |
| Protection class | IP40 |
| Weight | 200 g (battery included) |
| Select Model |
1/8" NPT male thread (VD84/2) ,DN 16 ISO-KF (VD84/1) |
|---|
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