1.4.6 Analog Current Output
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 (section
1.4.8).
1.4.7 Range ID Output
The model 1100 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 resolution outputs at all times. For a complete listing of analyzer ranges, refer to
Appendix E – range / output chart.
Remote auxiliary devices designed to interpret the model 1100 analog outputs over multiple output
range scales require an indication of the analyzer’s selected range at all times for accurate scaling.
The model 1100 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 five range ID voltage
levels used in the 1100 to correspond with its five output ranges (Appendix E – range / output
chart).
1.4.8 Service Port
The Service port provides a user-friendly means of digital communications with the model 1100
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 for
users who prefer to use digital instead of analog interfacing with the analyzer. In addition, 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.
1.5 Control panel User Interface
1.5.1 The “UP” Pushbutton
The “UP” pushbutton on the control panel can be used to program the 1100 Analyzer. This
momentary push-button soft key is used to enter incremental information. Its function is menu-
driven.
1.5.2 The “DOWN” Pushbutton
The “DOWN” pushbutton on the control panel can be used to program the 1100 Analyzer. This
momentary push-button soft key is used to enter decremental information. Its function is menu-
driven.
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