1.11
1.6 Transducer site numbering system
The xentra chassis may accommodate a number of internal transducers which are
assigned site locations represented as I1, I2 and I3 on the display.
For the 4902 analyser, the chassis may accommodate up to two internal
transducers. This is normally a Gfx transducer plus a paramagnetic oxygen
transducer. The Gfx transducer will always be configured in location I1 and the
paramagnetic oxygen transducer will always be configured in location I2.
For the 4904 analyser then the chassis may accomodate up to three internal
transducers. This would normally be two Gfx transducers plus a single
paramagnetic oxygen sensor. The Gfx transducers will always be configured in
locations I1(Gfx 1) and I3 (Gfx 2) with the paramagnetic oxygen transducer
configured in location I2.
1.7 Output numbering system
The outputs from the xentra have a two digit identification number of the following
format :
Card number . Output
eg. the outputs fitted as standard in card position 1 are :
1.1 Analogue output
1.2 Analogue output
1.3 Relay
1.4 Relay
1.5 Relay
These identification numbers appear on the rear label to identify the terminals where
each output appears and on the display when the outputs are being configured.
1.8 Transducer full scale deflection
The transducer full scale deflection ( FSD ) is the maximum concentration level that
may be measured and displayed with the precision and accuracy specified for that
transducer. This may also be termed the measurement range for the transducer.
Concentration levels that exceed 120% of the FSD are considered as over range
and are indicated by the word ‘OVER’ on the analyser display.
There are three set up parameters on the xentra instrument that are expressed in
terms of the FSD.
C Calibration tolerances for the transducers.
C Alarm hysteresis.
C The upper limit of the analogue output.
The FSD values for the different transducer types that may be fitted inside the
xentra 4900 chassis are shown in table 1.1.
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