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Principles of Operation
8.5.6. PNEUMATIC SENSOR BOARD
8.5.7. RELAY BOARD
8.5.7.1. Relay PCA Location and Layout
8.5.7.2. Heater Control
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The flow and pressure sensors of the T200H/M are located on a printed circuit assembly
just behind the PMT sensor. Refer to Section 7.5.16 for information on how to test this
assembly. The signals of this board are supplied to the motherboard for further signal
processing. All sensors are linearized in the firmware and can be span calibrated from the
front panel.
The relay board is the central switching and power distribution unit of the analyzer. It
contains power relays, valve drivers and status LEDs for all heated zones and valves, as
well as thermocouple amplifiers, power distribution connectors and the two switching
power supplies of the analyzer. The relay board communicates with the motherboard
2
over the I
C bus and can be used for detailed trouble-shooting of power problems and
valve or heater functionality. See Figure 7-4 for an annotated view of the relay board.
Generally the relay PCA is located in the right-rear quadrant of the analyzer and is
mounted vertically on the back side of the same bracket as the instrument's DC power
supplies, however the exact location of the relay PCA may differ from model to model
(see Figure 3-5)
The heater control loop is illustrated in Figure 8-20. Two thermocouples (T/C) inputs can
be configured for either type-J or type-K thermocouples. Additionally:
•
Both T/C's can be configured as either grounded or ungrounded thermocouples.
•
Standard configuration of the both type of thermocouples is 10 mV/°C. In order to
accommodate the T200H's Mini High-Con converter option, a type-K; 5mV/°C output
configuration has been added.
Teledyne API - Model T200H/T200M Operation Manual
07270D DCN7141
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