Theory Of Operation Model 100E Instruction Manual
184 045150102 Rev XB1
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.
See section 6.7.5 for instructions on performing this test.
10.4.8. Relay Board
The relay board is the central switching unit of the analyzer. It contains power relays,
status LEDs for all heated zones and valves as well as valve drivers, thermocouple
amplifiers, power distribution connectors and the two switching power supplies of the
analyzer. The relay board communicates with the motherboard over the I
2
C bus and is
the main board for trouble-shooting power problems of any kind.
10.4.8.1. Heater Control
The M100E uses a variety of heaters for its individual components. All heaters are AC
powered and can be configured for 100/120 VAC or 220/230VAC at 50-60 Hz.
The two sample chamber heaters are electronically connected in parallel for analyzers at
100/120 VAC line power and in series for units configured for 220/230 VAC. One
configuration plug on the relay board determines the power configuration for the entire
analyzer.
On units with IZS options installed, an additional set of AC heaters is attached to the IZS
permeation tube. Some special M100E models may have other, non-standard heating
zones installed, such as a dilution manifold.
10.4.8.2. Valve Control
The relay board also hosts two valve driver chips, each of which can drive up four valves.
In its basic configuration the Model 100E requires no special valves to operate. However,
on units with either the zero/span valve or the IZS option installed The valves are.
Manifold valves may also be present in certain special versions of the analyzer.
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