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Relay PCA 04523 Addendum to E-Series Operator Manuals
2.4. Heater Control Loop
Thermistor(s) – Low Temperature Sensing:
(e.g. Sample Chamber and Reaction
Cell temperatures)
RELAY PCA
DC
Control
Logic
Solid State
AC Relays
Preamplifiers
and Signal
Conditioning
MOTHER BOARD
A/D
Converter
(V/F)
CPU
Themocouple(s)
(High Temperature Sensing;
e.g. Moly and HiCon
Converter temperatures)
AC HEATERSDC HEATERS
THERMOCOUPLE
CONFIGURATION
JUMPER
(JP5)
Cold Junction
Compensation
Figure 2-7: Heater Control Loop Block Diagram.
While the role of the heater control lop for the E-Series analyzers is basically unchanged from the
previous version (see Figure 2-4) the configurability of the Thermocouple inputs has been
enhanced. Previously, the two T/C inputs could be configured for either type-T or type-K
thermocouples. The 04523 relay PCA adds the following.
Both T/C’s can now 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 M200EH’s Mini High-Con converter option, a type-K; 5mV/°C output
configuration has been added.
05118 Rev B3 11