Alicat PCU Portable Calibration Unit User Manual
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POWER
The PCU is designed to operate on either two 9 Volt Alkaline batteries or via a 9-20VDC power supply
running at a minimum 100mA. The batteries should operate the PCU for 8 hours under normal usage.
If the batteries drop below 7 volts, the replace battery light will come on and the batteries should be
replaced or alternate power should be applied.
When the replace battery light is on the accuracy of the meters’ readings cannot be guaranteed.
Application
Maximum operating line pressure is 145 PSIG (1000 kPa).
Caution: Exceeding the maximum specified line pressure may cause permanent damage to the
solid-state differential pressure transducer.
If the line pressure is higher than 145 PSIG (1000 kPa), a pressure regulator should be used upstream
from the flow meter to reduce the pressure to 145 PSIG (1000 kPa) or less if possible. Although the
meter’s operation is uni-directional, reversing the flow direction will inflict no damage as long as the
maximum specified limits are not exceeded.
Note: Avoid installations (such as snap acting solenoid valves upstream) that apply instantaneous
high pressure to the meter as permanent damage to the differential pressure sensor could result.
This damage is not covered under warranty!
Figure 1. PCU Controls and Connections
Note: Inlet and Outlet connection diameters may vary, depending on how the PCU is configured.
AC/DC Power Port