Emerson Rosemount 6888A, Reference Manual

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NOTICE
The optional Rosemount SPS 4001B or Rosemount IMPS 4000 Sequencer can only be used
when the Rosemount 6888Xi advanced electronics option is selected. The Rosemount 6888Xi
must be properly configured for autocalibration. See
Chapter 3 .
See the SPS 4001B Single Probe Autocalibration Sequencer Instruction Manual or the
IMPS 4000 Intelligent Multiprobe Test Gas Sequencer Instruction Manual for wiring and
pneumatic connections.
2.4.2 Calibration gas
Two calibration gas concentrations are used with this transmitter, low gas - 0.4% O
2
,
balance N
2
, and high gas - 8% O
2
, balance N
2
.
CAUTION!
CALIBRATION READING ERRORS
Do not use 100% nitrogen as a low gas (zero gas). Emerson suggests that gas for the low (zero)
be between 0.4% and 2.0% O
2
. Do not use gases with hydrocarbon concentrations of more than
40 parts per million. Failure to use proper gases will result in erroneous readings.
CAUTION!
EQUIPMENT DAMAGE
If the ducts will be washed down during outage, MAKE SURE to power down the Rosemount
6888A units and remove them from the wash areas.
NOTICE
Upon completing installation, make sure that the transmitter is turned on and operating prior
to firing up the combustion process. Damage can result from having a cold unit exposed to the
process gases. During outages, if possible, leave all units running to prevent condensation and
premature aging from thermal cycling.
An optional manual calibration panel is shown in Figure 2-17 . See Figure 2-18 for the
Rosemount 6888A probe calibration gas connection ports.
Install
Reference Manual 45