UEi Test Instruments AK900SC - Manual (Page 9)

9
1 Low and High Side
In general, displays on the left side of the screen are associated with
the low-pressure side of the refrigeration system, represented by the
blue labeling. The right side of the display reflects the high-pressure
side, represented by the red labeling.
The low or high side display will flash when one of the following
abnormal pressure conditions occur on each side of the service
manifold:
• The pressure detected has exceeded the working pressure range of
the gauge, or
• The pressure detected far exceeds the proper operating range for
the selected refrigerant, resulting in out-of-range temperature
readings.
This may be caused by improper use of the ZERO key, or if the
working pressure range has been exceeded. Try depressurizing the
manifold and press ZERO to recalibrate to a proper atmospheric
reference. Also ensure the proper refrigerant is selected.
Bear in mind that readings are subject to device accuracy limitations.
For example, a perfect vacuum of 29.9"Hg may be displayed as
29.8"Hg or cause the device to blink due to an excessive vacuum