Manual

The Model 320 does not employ any overpressure
relief bypass. The maximum overpressure for the
various sensors is given in the specifications section.
Exceeding these pressures can cause a shift in the
calibration of the unit or permanent damage to the
sensor.
OPERATION
LOOP POWER SUPPLY
The Loop Power Supply (LPS) contains eight (8) AA
Ni-Cd batteries that provide power to a DC to DC
converter. This converter boosts the battery voltage
(10.6 to 9.2) to 24 VDC ±5%. The LPS is intended
for use as a power suppy for any two wire, 4 to 20
milliamp instrument requiring 24 VDC power.
Battery life is 6 hours nominal at 20 milliamps. Full
specifications can be found on page 51.
The LPS is designed to turn itself on and off
automatically, based on current demand. When a
series loop exists at the LPS loop power jacks calling
for .5 milliamps or greater, the LPS will automatically
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