Operation
ULTIMA X
®
Series
38
GB
4.2 HART Compatible Communications Interface
The hand-held HART Communicator, such as the Emerson 375 Field Communica-
tor, must be HART revision 7 compliant and can be obtained from a HART-autho-
rised supplier. See chapter 13 for command definitions.
4.3 Commissioning
ULTIMA X
®
Series instruments are calibrated at the factory and are immediately
ready for use.
After power is applied to the instrument, the LCD shows a test of all display words.
The software version is then displayed, followed by a 30 second countdown for sen-
sor stability. During this time, the output signal corresponds to the calibration output
signal (3.75mA for combustible or toxic, 21mA for oxygen).
[more information chapter 5, “Calibration Output Signal in ULTIMA® X Series
Gas Monitors”]. See 10.1 “Instrument Operation for Fault Relay behaviour during
power-up”.
For instruments with LEDs, the red alarm LED is ON steady during the 30 second
countdown.
After 30 second countdown, check whether the gas type and gas concentration
[ppm, % gas or % LEL] are displayed alternately.
Fig. 9 Display of gas concentration
For instruments with LEDs, the green normal LED is ON steady after completing
the 30 second countdown. For more information, see "List of instrument functions"
in chapter 10.1.
During normal operation, the ULTIMA X monitor displays the gas concentration of
the area surrounding the sensor. The corresponding output signal can be transmit-
ted to a controller or read directly from the optional HART port with an
HCF (HART Communications Foundation) approved communicator.
The ULTIMA X
®
Series catalytic model for detecting combustible gases
can detect certain combustible gases in concentrations above
100 % LEL. When exposed to these concentrations the ULTIMA X
®
Series Gas Monitors will display one of the following two modes.
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