The temporary adapter should be used only until a properly grounded outlet (Sketch A) can be installed by a
qualified electrician. The green colored rigid ear, lug, etc. extending from the adapter must be connected to a
permanent ground such as a properly grounded outlet box cover. Whenever the adapter is used, it must be held in
place by a metal screw.
2.24 Extension Cords
If necessary to use an extension cord, use a 3-wire extension cord that has a 3-blade grounding plug, and a 3-slot
receptacle that will accept the plug on the product. Make certain your extension cord is in good condition. Make
certain your extension cord wire size is not less than 18 guage for 25 feet, 16 guage for 50 feet, and 14 guage for
100 feet. An undersized cord will cause a drop in line voltage resulting in loss of power and overheating. If in
doubt, use the next heavier cord. The smaller the guage number, the heavier the cord.
2.25 Vacuum Gauges
2.25.1 Analog Vacuum Gauge
A dial vacuum gauge is incorporated in the vacuum system 2025 and 2026.
The dial gauge is located in the top front section of the system.The dial vacuum gauge is commonly used to
indicate vacuum level when operating in the rough vacuum range (2 torr, 2.7mbar, 29.8 in Hg). Dial vacuum
gauges give negative pressure - that is pressure below atmospheric. The reference point for the gauges is
atmospheric pressure.
Please keep in mind that atmospheric pressure tends to vary from day to day. As a result of this variability, a
dial vacuum gauge will indicate slightly different maximum vacuum readings from day to day.
2.25.2 Digital Vacuum Gauge for 2027 only
A digital vacuum gauge is incorporated into the model 2027 vacuum system.
The digital gauge is an absolute gauge located in the top front section of the Self-Cleaning system. The unit of
measurement is preset during production.
To change the unit of measurement, unplug the pump, remove the base panel at the bottom of the pump and adjust
the unit of measurement switch (SW1) to the desired setting as indicated in the above table.
Diagram of Board and Switch SW1 is located in Section 6.11 and 6.12 .
Model
Unit of Measurement
On Switch Setting (SW1)
202701
Torr
or
202703
mbar
202705
kPa
7
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