Teledyne 3060e - Ultra Trace oxygen analyzer - Manual (Page 25)

Teledyne Electronic Technologies
Analytical Instruments
2-15
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Temperature Controller
Temperature control in the oven, which houses the sensor and Faradaic
calibrator, is processed by a stand-alone proportional integrative derivative
(PID) controller. Input from the resistive thermal device (RTD) sensor located
in the oven is used to regulate two 25-watt heaters. Oven temperature is set at
28 ±2°C and should be kept at this temperature during analyzer operation.
Valve Control Circuit Board
The valve control PCB is external to the control module, across the top of the
front panel of the analyzer. This PCB contains driver circuitry to activate the
solenoid valves. It also contains and controls dual-color LEDs that indicate the
actual status of the pneumatic valves (green for OPEN and red for CLOSED).
The valve control PCB operates under the control of the system microcom-
puter.
Power Supply Module
NOTE: This power supply contains an International Power Entry Module.
This feature allows operation on any of four international voltage
ranges: 100V, 120V, 220V or 240V (50Hz or 60Hz). It also
facilitates both North American and European fusing arrange-
ments. Instructions for programming this module are described in
Chapter 3, Voltage Selection.
The analyzer power supply module is a replaceable assembly containing four
power supplies and five alarm relays. Electronic circuitry used to drive and
interface the alarm relays to the output of the microcomputer is also located
inside this module.