XNXTM Universal Transmitter Safety Manual ••Table of Contents ••SIL 2 Certificates ••Overview ••Safety Parameters ••Fault Diagnostic Time Interval ••Proof Test ••Proof Testing Procedure
XNX Universal Transmitter Table of Contents 1 SIL 2 Certificate............................................................................................................................................................................................. 3 1.1 XNX Gas Detector Transmitter............................................................................................................................................................. 3 2 Overview.......................................................
XNX Universal Transmitter 1 SIL 2 Certificate 1.
XNX Universal Transmitter 2 Overview Table 2. Probability of a Dangerous Failure Per Hour (High Demand System) Safety Integrity Level 4 3 2 1 IEC 61508 is a generic functional safety standard. Functional safety is defined in this standard as “part of the overall safety relating to the Equipment Under Control (EUC) and the EUC control system which depends on the correct functioning of the E/E/PES1 safety related systems, other technology safety-related systems, and external risk reduction facilities.
XNX Universal Transmitter 3 Safety Parameters The safety parameters listed below are a combination of the main board, personality board, and sensor. These numbers were provided by TUV in report 968/EL 665.01/09 (personality boards) and report 968/EZ 319.02/09 (main board). For safety parameters of the individual sensors, refer to the XNX Safety Parameters For Sensors white paper.
XNX Universal Transmitter Component XNX Universal Transmitter with Infrared Combustible Gas Detector (with Searchpoint Optima Plus) Component XNX Universal Transmitter with Infrared Combustible Gas Detector (with Searchline Excel) SIL Level* Safety PFDavg** Architecture PFH (1/h) SFF % DC % SIL2 1oo1 4.8E-04 1.1E-07 95.9 >81% λ (fit) λDu (fit) λDd (fit) λD (fit) SC PTC % 5375 220 2265 2486 2 100 PFH (1/h) SFF % DC % SIL Level* Safety PFDavg** Architecture SIL2 1oo1 7.
XNX Universal Transmitter 5 Proof Test 6 Proof Testing Procedure 5.1 Purpose of Proof Testing 6.1 Checking A proof test is a periodic test to detect failures in the system so that, if necessary, the system can be restored to an “as new” condition or as close as practical to this condition. The purpose of checking is to ensure the mA output meets the expected levels. If the current does not meet the expected levels, it will have to be adjusted. If, after completing 6.1.1, 6.1.2, and 6.1.
XNX Universal Transmitter 6.1.2 Zero Gas mA Output The procedure for zero gas is not applicable to the ECC O2 sensor. 1. Apply zero gas to the sensor. 2. The current at the controller end should be 4.0 mA. If the mA output is not at the expected level when applying zero gas, perform a Zero Gas Calibration. Refer to 6.2.2 and complete the procedure for a Zero Gas Calibration. 6.1.3 Calibration Gas mA Output Figure 2. Adjusting Current 4.
XNX Universal Transmitter 6.2.2.1 Zero Gas Calibration 6.2.2.2 Span Calibration NOTE: If a Span Calibration is not required, select ✖ to skip the Span Calibration and return to the Calibration Menu. Sensor Reading at Current Settings 1. When the Zero Gas Calibration is complete, the Span Concentration screen appears. The gas concentration for the Span Gas Calibration can be changed. If the Span Calibration is skipped, the Gas Calibration screen displays. Figure 4.
XNX Universal Transmitter Selecting ✖ will cancel the span calibration and return to the Gas Calibration Menu. 4. When the sensor has completed the calibration and the span algorithms have determined that it is within range, the Span Passed screen will appear. Figure 11. Exiting Zero Gas and Span Gas calibrations WARNING While XNX is in Inhibit Mode, alarms are silenced. This will prevent an actual gas event from being reported. Inhibit Mode must be reset after testing or maintenance activities.
XNX Universal Transmitter 3. Refer to Table 6 for the mA levels. If the values do not match the values in the table, proceed to step #4 to adjust the values. NOTE If the values for the faults and warnings have been changed from the default settings since installation, ensure the current output matches those changed values. Table 3. Set mA Levels Signal* I W O B** L** Inhibit Warning Overrange Beam Blocked Low Signal Default 2.0 mA 3.0 mA 21.0 mA 1.0 mA 1.0 mA Output (mA) Min 1.0 1.0 20 1.0 1.
XNX Universal Transmitter Figure 20. Alarm/Fault Reset Screen Figure 17. Confirmation Selecting ✓ will simulate the selected alarm. If the ✖ is selected, the simulation is aborted. 4. To simulate a Warning or Fault from the XNX, select the appropriate icon from the menu. As in an alarm simulation, a confirmation screen will appear. Figure 21. Alarm/Fault Reset Screen Selecting will reset all alarms, faults or warnings generated by the simulation. If ✖ is selected, the simulation continues.
Learn more: www.honeywellanalytics.com Americas Honeywell Analytics 405 Barclay Boulevard Lincolnshire, Ilinois 60069 Tel: +1 847 955 8200 Toll free: +1 800 538 0363 Fax: +1 847 955 8210 detectgas@honeywell.com Europe, Middle East, and Africa Life Safety Distribution GmbH Javastrasse 2, 8604 Hegnau Switzerland Main Phone: +41 (0)44 943 4300 Main Fax: +41 (0)44 943 4398 gasdetection@honeywell.
