Model 3100 Analyzer Instruction Manual
Page 6
Manual file name: MN-A-0005, Rev. C
Manual P/N: C5-06-4900-16-0
Heater OK output
1.4.5
The Heater OK output relay is a system diagnostic used to indicate that the Model 3100 has detected a
sensor heater temperature that is not within specification tolerance (see section 4.3.1 – Fault Codes and
Definitions). The relay output activation is non fail-safe, and is not configurable. The Heater OK relay
contacts are Form B (SPST), voltage-free.
Analog voltage output
1.4.6
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 or 1, 5 or 10-VDC full-scale. The factory default setting is 0-1
VDC (see Appendix C, Factory Configuration). The analog voltage output is scaled according to the
analyzer’s selected range and must be used in conjunction with the Range ID voltage when the analyzer
is configured for auto-ranging (see section 1.4.8).
Analog current output
1.4.7
The analog current output is a dynamic current flow used to indicate to a remote device the displayed
oxygen concentration during normal analyzer operation and system maintenance. The analog current
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 output levels by analyzer range, refer to Appendix
E – range / output chart.
The minimum scale deflection may be set to either 0 mA or 4 mA. Full-scale is fixed at 20 mA. The
analog current output is scaled according to the analyzer’s selected range and must be used in
conjunction with the Range ID voltage when the analyzer is configured for auto-ranging (see section
1.4.8).
Range ID output
1.4.8
The Model 3100 can be configured by the user to automatically switch its measurement range, based on
the concentration of oxygen measured while in-service, to provide the most accurate and highest possible
resolution outputs. For a complete listing of analyzer ranges, refer to Appendix E – range / output chart.
Remote auxiliary devices designed to interpret the Model 3100 analog outputs over multiple output range
scales require an indication of the analyzer’s selected range at all times for accurate scaling. The Model
3100 features a 0-10 VDC auto-range identification output. The range ID output is used in conjunction
with the analog voltage and analog current outputs when auto-ranging is used. It provides an indication
of the analog outputs’ selected full-scale. There are four range ID voltage levels used in the 3100 to
correspond with its four output ranges (Appendix E – range / output chart).
Service port
1.4.9
The RS-232 service port provides a user-friendly means of digital communication with the Model 3100
analyzer. Through this port, the unit may be configured, calibrated, and queried for most functions. The
RS-232 port may also be programmed to send out information on a timed basis. Additionally, the service
port may be used with a PC based computer (such as a portable notebook computer) over a standard bi-
directional RS-232 serial interface.
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