PCC-IV Instruction Manual (rev. 0.1)
Page 1-6
Section 1 - Product Overview
Drum Level Pressure Vs. Density Compensation
In applications where there are large swings in steam demand, the steam generator’s drum level can be subjected
to significant shrink and swell. Density compensation is an important tool in assuring optimum drum level control
despite these conditions.
Oxygen Sensor Control/Signal Conversion (option card)
Zirconium oxide “in situ” oxygen analyzers include a basic electronics package that maintains sensor temperatures
at exacting levels and converts the millivolt output of the sensor
into a linear “O
2
vs. milliamp” function (4-20 mA
dc). When equipped with the appropriate option card, the PCC-IV
performs the same function as the manufacture’s
electronics package, while coincidentally allowing for the automatic integration of that variable into any planned
control or monitoring strategy.
Relay Output Channels
The PCC-IV can be equipped with up to 6 relay outputs. The relay contacts are rated for up to 8A inductive loads
and include integral surge suppressors for extended contact life. These outputs can be directly wired into most
burner limit circuits wi
thout external “helper” relays.
Flow Totalization
The PCC-IV is equipped with a pulse counter function-type to permit output and subsequent totalization of flow
rates on digital displays. This can eliminate the need for local counters on flow meters in those instances when they
already transmit an analog flow signal to the PCC-IV.
