Model 300E Carbon Monoxide Analyzer
Instruction Manual
Operating Instructions
P/N 04288 REV: A 77
An alternative method for setting up the Current Loop outputs is to connect a
250 ohm ±1% resistor across the current loop output in lieu of the current meter.
Using a Voltmeter connected across the resistor follow the procedure above but
adjust the output for the following values:
Table 6–9: Current loop Output Check
% FS
Voltage across Resistor
for 2-20 mA
Voltage across Resistor
for 4-20 mA
0 0.5 VDC 1 VDC
100 5.0 5.0
6.6. Diagnostic Mode (DIAG)
A series of diagnostic and configuration tools is grouped together under the menu
heading DIAG located under the SETUP Menu, in the MORE (see Appendix A)
subsection. These tools can be used in a variety of troubleshooting and diagnostic
procedures.
The various operating modes available under the DIAG menu is:
Table 6–10: Diagnostic Mode (DIAG) Functions
Display
Mode
Meaning
Manual
Section
DIAG I/O SIGNAL I/O: Allows observation of all digital and analog signals
present in the instrument. Allows certain digital signals to be
toggled between ON and OFF states.
6.6.1
DIAG AOUT ANALOG I/O: The analyzer is performing an Analog output Step
Test. This calibrates the Analog output channels.
6.6.2
DIAG AIO ANALOG I/O CONFIGURATION: Analog I/O parameters are
available for viewing. Allows certain signals to be toggled between
ON and OFF states.
6.6.3
DIAG ELEC ELECTRIC TEST: The analyzer is performing an Electric Test. This
test simulates IR detector signal in a known manner so that the
proper functioning of the Sync/Demod Board can be verified.
6.6.4
DIAG DARK DARK CALIBRATION: The analyzer is performing a Dark
Calibration procedure. This procedure measures and stores the
inherent DC offset of the Sync/Demod Board electronics.
6.6.5
DIAG FCAL FLOW CALIBRATION: The analyzer is performing a calibration of
the Gas Pressure/Flow Sensors.
6.6.6
DIAG TCHN TEST CHAN OUTPUT: Used to configure the TEST Analog Output
channel.
6.4.7
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