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Instruction Manual
IM-106-5500, Original Issue
August 2005
3-9
CCO 5500
Any of the four averaging stacks
(seconds, minutes, hours or days)
may be used for the analog output.
They are selected by the ARROW
keys and entered using the ENTER key.
c. Output Units
The analog output can represent the
gas concentration in units of either
mg/m
3
, mg/Nm
3
or ppm. The ARROW
keys will 'toggle' between these three
options. Press the ENTER key to enter the new value.
d. Output Span
Select the required span using the
ARROW keys for each digit. The
ENTER key is pressed to enter the
value of each digit. The units will be
displayed as either ppm, mg/m
3
or mg/Nm
3
, depending on what has
been selected beforehand. The current value will be displayed for 1
second when this option is entered. The display then defaults to
zero; thus the span value must be re-entered for the unit to function
correctly.
e. Fault Indication
Should a fault condition occur, the
current output of the instrument may
be set to any of the following options:
• Set the output at 0 mA - ZERO.
• Adjust the output to the calculated gas concentration even though
a fault condition exists - MEAS.
• Hold the last calculated gas concentration - HOLD.
• Set the output to full scale (20 mA) - F.S.
One of these options can be selected by pressing the ARROW keys;
when the desired option is displayed press the ENTER key.
f. Set mA Output
NOTE
This is set at the factory and should not be altered without due consideration.
From this option the current levels of
the analog output are set up. Press the
ENTER key to select it, and the
operator is prompted to set the current
levels at 0 and 20 mA.
When this is displayed, the current output should be set to 0mA as
measured with a calibrated current meter across the analog current
loop terminals; nothing else should be connected to these terminals
when the output is being set up.
5 CONFIGURE O/P
Average 01m
5 CONFIGURE O/P
Units mg/m3
5 CONFIGURE O/P
Span 0000mg/m3
5 CONFIGURE O/P
Fault cond ZERO
5 CONFIGURE O/P
Set Zero (007)