EC9830 CO ANALYZER OPERATION MANUAL
4-4 98307600 Rev. C-1
5. Not valid.
6. An error is valid if the cooler voltage is below 0.5 volts or above 1.5 volts.
7. Valid.
8. Span ratio out of range is defined as calibration gain changing below 75% or
above 125% gain change.
9. An error is flagged if the mirror cell or flow block temperatures are below
35° C or above 60° C or if the converter temperature is less than 80° C or
greater than 100° C.
10. An error is flagged if the 12-volt supply voltage is below 11.1 volts or greater
than 14.3 volts.
11. Unused.
12. This signal is the logical OR of FLOWFAIL, LAMPFAIL, CHOPFAIL, CVFAIL,
COOLERFAIL, HEATERFAIL, REFFAIL, PS-FAIL, and HV-FAIL.
4.1.2 50-Pin I/O Inputs
The DOZERO and DOSPAN controls (pins 5 and 6) are TTL compatible inputs with
internal 4.7K ohm pull-up resistors. These inputs are active low and can be driven
to ground by dry contact relays, open collectors or TTL compatible ICs. The logic
levels for control inputs are standard TTL levels. They are:
low < 0.8 V 2 V < high < 5 V
4.1.3 50-Pin I/O Outputs
The status outputs are active low ULN2003 open collector Darlingtons. The status
outputs can be used to drive relays or, with the use of external pull-up resistors, as
a voltage indication of on/off conditions. The internal +12 V (pin 50) or an
external power supply may used as the relay or indicator power source.
Current through the outputs should be kept as low as possible, ideally around
1 mA. If an external supply is used it should be less than 50 VDC, and the current
sunk by each output should be <50 mA. If the internal +12 V supply is used the
total current drawn must be kept to less than 50 mA or damage to the analyzer
will result.
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