DETECTOR GAS COMBINATION MSA, ALTAIR 5X W/WHEELMARK 213.050 330596

State the sensors and the combustible calibration. The code names the model, not the sensor set. MSA lists combustible (LEL or % volume), O2, CO, H2S, SO2, NH3, Cl2 and VOC sensors depending on configuration. The catalytic combustible sensor can be set up for several LEL definitions: methane at 4.4 % or 5 % by volume, propane, butane, pentane or hydrogen. The same 1.45 % methane test gas then reads 33 % LEL on the methane 4.4 % setting and 58 % LEL on the pentane setting. Ask for the setting the ship’s procedures use.^[2][1]

Choose between this code and 330597, the ALTAIR 5X IR. The catalytic sensor needs more than 10 % oxygen to read correctly, and MSA says only IR sensors are acceptable in inert atmospheres. The IR version takes up to five sensors, including one infrared sensor for CO2 or for specific combustible gases up to 100 % by volume. For gas-freeing inerted cargo tanks, that is the version to ask for.^[1]

Order the consumables with the instrument. MSA recommends a bump test before each day’s use and a full calibration periodically and after a failed bump test. Its four-gas calibration cylinder (58 l: 1.45 % CH4, 15.0 % O2, 60 ppm CO, 20 ppm H2S) is part 10053022, used with a demand-flow regulator. Use only MSA-approved sampling lines, never silicone tubing, and allow at least 3 seconds per metre of line for the sample to arrive.^[1]

Portable oxygen analysis and gas detection equipment is item MED/3.30b under the Marine Equipment Directive, updated by Implementing Regulation (EU) 2025/1533 from 23 September 2025. The MED declaration in the 2015 manual cites the older Directive 2010/68/EC. Ask the supplier for the current Declaration of Conformity and MED certificate for the configuration supplied.^[3][1]

The same declaration gives ATEX certificates FTZU 08 ATEX 0340 X and FTZU 09 ATEX 0006 X. With the combustible sensor fitted, the marking is II 2G Ex db ia mb IIC T4 Gb, for −40 °C to +50 °C, IP65. MSA warns against changing the battery or charging it in a hazardous location. MSA notes that approvals vary with configuration and part number, so check the label.^[1][2]

MSA’s manual also states the instrument’s limits. Do not use it for combustible readings in vapours from liquids with a flash point above 38 °C, as readings may be low. Do not use it for combustible dusts or mists. Do not use catalytic readings in oxygen-deficient or inert atmospheres.^[1]