ULTIMA X
®
Series
GB
41
Non-combustible Chemical Substances that cause Reduced Sensitivity of the
Catalytic Sensor
Catalytic sensors for combustible gases in areas where non-combustible chemical
substances can escape must be calibrated after such an exposure. This is espe-
cially applicable when the user is aware that some substances reduce the sensiti-
vity, such as Silanes, Silicates, Silicones and Halides [compounds containing
Fluorine, Chlorine, Iodine or Bromine].
Resetting Latched Alarms
If a latched alarm was triggered at a ULTIMA X Gas Monitor [flashing display]:
- The alarm can be reset with an infrared remote control [such as an ULTIMA Ca-
librator or Controller].
- The latched alarm is reset by the next infrared signal received from a Calibrator
or Controller [as long as the alarm threshold is no longer exceeded].
The actual infrared command is ignored and interpreted as "Alarm-Reset". When
the latching alarm function is inactive, other valid IR commands may be used.
Calibration Output Signal in ULTIMA® X Series Gas Monitors
The ULTIMA® X Series Gas Monitor is shipped with the calibration output signal
disabled so the output signal will correspond to the gas concentration value during
the calibration process. In some applications it may be desirable to enable the ca-
libration output signal or lock the output to a pre-determined output value to prevent
activation of alarm devices. The calibration signal can be enabled using
HART command #187 or the ULTIMA X Controller [ chapter 10.1 “Instrument
Operation”].
When the calibration output signal is enabled, the output signal is 3.75 mA for the
4-20-mA models.
For pump application the flow rate must be within 0.5 and 5 l/min. At the
gas outlet a tube of at least 30 cm shall be used.
A list of interfering gases for electrochemical sensors is given in the
"Response characteristics of sensors“ tables in chapter 10.2.
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