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THEORY OF OPERATION
10.3.7. Power Supply/ Circuit Breaker
The analyzer operates on 100 VAC, 115 VAC or 230 VAC power at either 50 Hz or
60Hz. Individual instruments are set up at the factory to accept any combination of
these five attributes. As illustrated in Figure 10-5, power enters the analyzer
through a standard IEC 320 power receptacle located on the rear panel of the
instrument. From there it is routed through the ON/OFF Switch located in the lower
right corner of the Front Panel.
AC Line power is stepped down and converted to DC power by two DC Power
Supplies. One supplies +12 VDC, for various valves and valve options, while a
second supply provides +5 VDC and ±15 VDC for logic and analog circuitry as well
as the power supplies for the Photometer and IZS UV Lamps.
All AC and DC Voltages are distributed via the Relay Board.
Power Switch / Circuit Breaker
A 6.75 Amp circuit breaker is built into the ON/OFF Switch.
Display
Keypad
CPU
Mother
Board
Temperature
Sensors
UV Source
Pressure
Sensors
Gas Flow
Sensor
236
Should the AC power circuit breaker trip, investigate and
correct the condition causing this situation before turning the
analyzer back on.
Cooling
IZS
Fan
Option
RELAY
BOARD
Photometer
Valve
Preamp
Options
Figure 10-7: Power Distribution Block Diagram
CAUTION
Reference
Detector
Option
PS 1 (+5 VDC; ±15 VDC)
PS 2 (+12 VDC)
Metal Wool Scrubber
Heaters
Measure / Reference
Valve
Model 400E Ozone Analyzer
Instruction Manual
ON/OFF
SWITCH
AC POWER
ENTRANCE
KEY
AC POWER
DC POWER
Pump
Heater for
Optional
P/N 04316 Rev: B
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