A quality set of gauges is necessary to accurately measure pressures. It is not necessary that the gauges be the most expensive, but be prepared to spend enough to get a durable and accurate set. Digital gauges should be considered, and while shopping for gauges, buying a micron gauge to monitor vacuum before charging is a good idea. A 0-100 psia trans-ducer (30” Hg to 100psi) added to the low side gauge and a 0-500 psig transducer added to the high side gauge can be powered with a separate dedicated power supply attached to the diagnostic cart.
These transducers can then be connected to your DVOM or Lab Scope and be monitored for changes over time. The point of adding the transducer to the high and low side gauges is to get a digital readout of the gauge pressure read-ings. Logging this type of data is not necessary to repair the vehicle, but is useful in technician education because if the tech understands what happens with pressure over time, they can better understand system operation.
If you’re a service professional and not a MACS member yet, you should be, http://bit.ly/10zvMYg for more information.
You can E-mail us at firstname.lastname@example.org . To locate a Mobile Air Conditioning Society member repair shop in your area. Click here to find out more about your car’s mobile A/C and engine cooling system.
The 35th annual Mobile Air Conditioning Society (MACS) Worldwide Training Conference and Trade Show, Meet me at MACS Make Connections that Matter, February 5-7, 2015 at the Caribe Royale, Orlando, FL.