2000/11/6
Japanese Marine Equipment Association
2 Draft text of Guidelines for on-board monitoring and recording devices
Guidelines for On-board NOx Monitoring and Recording Devices (draft)
1. Definition of continuous NOx monitoring
1.1 General
Continuous NOx monitoring for certification survey shall be made at least five times within the last 30 days before the periodic and intermediate surveys at the most frequently used load point during NOx monitoring. Each measuring time shall be continued at least for 30 minutes. However, if there is rational reason for inability to take measurements within 30 days, measurement data taken within six months before the certification survey shall be permitted.
Developments is being proceeded for NOx monitoring starting after the previous periodic or intermediate survey until 30 days before the next survey.
1.2 Specifications of NOx monitoring and recording devices
1.2.1 General
.1 A device for on-board continuous measurement and recording exhaust gas components during ship operation is used as an equipment to monitor and record NOx, and it shall have sufficient mechanical strength against vibration and shock, where the measurement value for the accuracy (repeatability) is not effected by.
.2 The device for monitoring and recording NOx are likely to have limitations in handling, posting of engineers, acquirement of related test instrument and so on, when compared with those of the device for land measurement of exhaust gas components.
Due to this reason, a device with simple handling and maintenance, with reliable performance and function shall be used.
.3 A device for on-board continuous measurement and recording of exhaust gas components during ship operation is used as an equipment to monitor and record NOx, where ambient conditions(temperature, humidity, power supply fluctuation, etc.) during measurement and skill capability of operator are put into consideration, which the function and performance are approved by the Administration based on this guideline.
.4 The analyzer used for NOx monitoring shall have a measurable range for precision concentration measurement. All analyzers shall be capable of continuous measurement from any gas stream, which can be output tor continuous recording. It is recommended that the analyzers shall be operated such that the measured concentration fall between 15% and 100% of full scale.
.5 The electromagnetic compatibility (EMC) of the device shall be set so that additional errors can be minimized.
