Emerson Rosemount Oxymitter 4000 Reference Manual page 58

Rosemount Oxymitter 4000
SW2 Setting
The factory sets this switch as follows:
1.
2.
WARNING
Typically, the probe's sensing cell, in direct contact with the process gases, is heated to
approximately 736 ° C (1357° F). The external temperature of the probe body may
exceed 450° C (842 ° F). If operating conditions also contain high oxygen levels and
combustible gases, the Hazardous Area Oxymitter 4000 may self-ignite.
3.
4.
Read O
Once the cell is up to operating temperature, the O
1.
2.
3.
58
Position 1 is HART/LOCAL. This switch setting controls the configuration of the
Hazardous Area Oxymitter 4000. The defaults cannot be changed via HART/AMS
unless the switch is in the HART position. Placing SW2, position 1 in the LOCAL
position forces the O range to the setting of position 2. The position 1 switch
2
must be placed in the LOCAL position or changes in SW2, position 2 will have no
effect.
Position 2 determines the O
25% O . The factory setting is 0 to 10% O
2
configured from 0 to 40% O
1 to HART and then enter the range via HART/AMS. Do not change SW2, position 1
to LOCAL unless you want to operate in the range specified by SW2, position 2.
Position 3 determines the output at startup or at an alarm. The settings are 3.5 mA
or 21.6 mA. The factory setting is 3.5 mA. At startup, the current at the analog
output is 3.5 mA or 21.6 mA.
Position 4 can be used to set the heater for 115 or 220 Vac operation. This switch is
functional only when the software is set for manual voltage selection (Auto Tune =
No). Otherwise, the internal electronics auto detect the input line voltage and sets
the heater voltage accordingly (Auto Tune = Yes).
Concentration
2
Access TP5 and TP6 next to the membrane keypad. Attach a multimeter across
TP5 and TP6. The calibration and process gases can now be monitored. Pressing
the INC or DEC once will cause the output to switch from the process gas to the
calibration gas. Pressing INC or DEC a second time will increase or decrease the
calibration gas parameter. If the keys have been inactive for one minute, the
output reverts to the process gas. When a calibration has been initiated, the value
at TP5 and TP6 is the %O
2
multimeter, are:
8.0% O = 8.0 VDC
2
0.4% O = 0.4 VDC
2
HART/AMS.
Model 751. The loop-driven LCD display.
range. This can be set to either 0 to 10% O
2
. If necessary, the O
2
. To select values within this range, set SW2, position
2
percentage can be read:
2
seen by the cell. Oxygen levels, as seen on the
Configuration with Membrane Keypad
July 2018
or 0 to
2
range can be
2