Replacing an XCell Sensor
The only routine maintenance item is the sensor, which has a limited lifetime. The ULTIMA X5000 sensors with TruCal technology will indicate when the sensor is near end of life through the Status Menu. When the Sensor Life & Health status is "Fair", you have approximately 2 months to replace the sensor before it will no longer function. When a TruCal sensor is no longer capable of sensing it will go into fault and LEDs will flash yellow. It is good practice to obtain a replacement sensing element before the sensing element within your unit becomes inoperative.
There is no need to open the main enclosure. Simply unscrew the digital sensor assembly from the sensor body assembly.
WARNING!
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Do not disassemble the sensor assembly. The sensing element inside may contain hazardous material. |
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Handle the sensor carefully; the electrochemical version is a sealed unit which contains a corrosive electrolyte. |
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Any leaked electrolyte that comes in contact with skin, eyes or clothes can cause burns. |
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If any contact with the electrolyte does occur, immediately rinse with a large quantity of water. On contact with the eyes, rinse thoroughly with water for 15 minutes and consult a doctor. |
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Do not install a leaking sensor in the sensing head assembly. The leaking sensor must be disposed of in accordance with local, state and federal laws. |
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As part of the product certification, it was verified that optional communication functions of this gas detection instrument while operating at the maximum transaction rate do not adversely affect the gas detection operation and functions of the instrument. The product certification, however, does not include or imply approval of the SafeSwap feature, communications protocol or functions provided by the software of this instrument or of the communications apparatus and software connected to this instrument. |
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Follow the warnings below when removing or replacing sensors. Reference for component overview. |
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Never remove or replace a Sensor Body Assembly or an Ultima XIR Plus while under power or when explosive hazards are present. |
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Confirm that the area is free of explosive hazards before removing or replacing an XCell Sensor under power. |
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To remove an XCell Sensor, unscrew XCell Sensor three full turns, wait 10 seconds, and then remove the XCell Sensor completely. |
Failure to follow this warning can result in serious personal injury or death.
Identify the sensor assembly needed via the A-5K-SENS code on the interior sensor label and obtain the appropriate sensor assembly. Screw the replacement XCell sensor onto the Sensor Body Assembly, ensuring that the XCell sensor mates flush against the bottom edge of the Sensor Body Assembly.
Figure 42 Removing the XCell Sensor
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Figure 43 Digital Sensor - Position of Labels
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Alarm set points, span value, full scale limit and alarm direction will not change when replacing a sensor with the same gas and range. Alarm set points, span value, full scale limit and alarm direction will change to the new sensor settings when replacing a sensor with a different gas and/or range.
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The ULTIMA X5000 Gas Monitor is shipped with the Sensor Swap Delay enabled. This means that the 4-20 mA output signal and the FAULT relay will hold off a fault indication for two minutes before the missing sensor indication is displayed on the device. This setting allows the operator to exchange sensor modules without a FAULT indication. See Swap Delay in Setting for more details.
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It is recommended that all other maintenance be performed at an MSA factory-authorized service center.
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