2.4 Analyzer inputs and outputs
Oxygen sensor input
The oxygen sensor electrical input to the Model 7100E is used to indicate the oxygen concentration
measured by the Model ZR400E oxygen sensor. It is proportional to the oxygen present in the measured
gas at the sensor membrane. The oxygen sensor input port is a female 7-pin DIN connector to mate with
the supplied sensor interface cable connector.
Alarm-1 relay output
The Alarm-1 relay is mapped to the Alarm-1 setpoint, and is provided for process control use. The user
may set the oxygen level at which Alarm-1 activates (section 3.2.2). Alarm-1 may be configured as
ascending (highest oxygen level allowable) or descending (lowest oxygen level allowable) action. The
relay output may be configured for fail-safe (relay coil de-energized in alarm state) or non-fail-safe (relay
coil energized in alarm state) action. Factory default settings are ascending, and fail-safe (Appendix C,
Factory configuration). The Alarm-1 relay contacts are Form C (DPDT), voltage-free.
Alarm-2 relay output
The Alarm-2 relay is mapped to the Alarm-2 setpoint, and is provided for process control use. The user
may set the oxygen level at which Alarm-2 activates (section 3.2.3). Alarm-2 may be configured as
ascending (highest oxygen level allowable) or descending (lowest oxygen level allowable) action. The
relay output may be configured for fail-safe (relay coil de-energized in alarm state) or non-fail-safe (relay
coil energized in alarm state) action. Factory default settings are ascending, and fail-safe (Appendix C,
Factory configuration). The Alarm-2 relay contacts are Form C (DPDT), voltage-free.
Fault relay output
The fault relay output is used to indicate that there is at least one system fault active on the Model 7100E
analyzer (section 4.3.1 – fault codes and definitions). The relay output action is non-fail-safe, and is not
configurable. The fault relay contacts are Form B (SPST), voltage-free.
Analog voltage output
The analog voltage output is a dynamic potential used to indicate to a remote device the displayed
oxygen concentration during normal analyzer operation and system maintenance. The analog voltage
output follows the oxygen readout displayed on the 7-segment LED display during all system and user
modes except for user setup. For a complete listing of available output levels by analyzer range, refer to
Appendix E – range / output chart.
The analog voltage range can be adjusted by the user (section 4.1 – system setup). Available settings
are 0-VDC for minimum-scale-deflection, to 1, 5 or 10-VDC full-scale. The factory default setting is 0-1
VDC (Appendix C, Factory configuration). The analog voltage output is scaled according to the selected
range, and must be used in conjunction with the range ID voltage when the analyzer is configured for
auto-ranging (section 1.4.8).
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