Emerson Process Management OXYMITTER 4000 IM-106-340 - Manual (Page 79)

Instruction Manual
IM-106-340, Rev. 4.0
May 2006
6-7
Oxymitter 4000
NOTE
Rosemount Analytical recommends 0.4% O
2
and 8% O
2
for calibration gases.
O2 Reset Values - Resets factory default values.
O2 Output Tracks - 4 to 20 mA signal can be held at the last value during
calibration, or the signal can be left to track the cal gases.
O2 Cal Interval - If automatic calibration is selected, this selects the interval
between calibrations.
O2 Next Cal - If automatic calibration is selected, this selects the time until
the first initial calibration takes place.
Gas Time - How long should each cal gas flow. Factory default is 300
seconds, but the user may want to vary this depending upon the length of
calibration gas tubing runs.
Purge Time - Used if the O
2
output is selected to hold the last value during
calibration. After the second cal gas is removed, how long until the sensor
comes back to the normal process reading, and the 4-20 mA signal can be
released.
Auto Calib? - Select "Yes" if an SPS or IMPS autocalibration system is part of
the system.
SYSTEM/Input/Output
Analog
Pertaining to the analog 4-20 mA signal representing O
2
.
O2 Type - 4-20 mA signal may be configured to increase with increasing
O
2
or the reverse.
O2 Range - Upper O
2
range is user selectable.
O2 Alarm Level - User can configure the digital output to alarm at a given
O
2
level.
Do O2 Trim - Procedure for calibrating the 4-20 mA signal to a precision
mA source. Procedure is intuitive.
Digital
A bi-directional logic signal may be configured as an alarm, or as a calibration
handshake signal.
Logic I/O Mode - One of 9 different sets of conditions can be set for the
digital signal. See Table 8-2.
Low O2 Alarm - If any of the conditions noted above include a low O
2
process alarm, set the value here.
Input State - Notes the current condition of the bi-directional digital signal.
Force Output - Forces the output state of the signal to either open or
closed. This is used primarily when diagnosing potential problems with this
signal.