8_Vol3_d4 3_Section 8 electrical works_en_GIR rev6.doc  For the calibration of the delivered units, sufficient number of calibration receptacles and test gas with  approximately 40% explosion limit of methane shall be delivered. The services also include installation,  stainless installation materials, adjustment and calibration. The design of the measurement transmitter shall be carried out as snap- on/plug-in board and has the following  characteristics: • Two adjustable alarm threshold • Visualization of main measurement value • 3 voltage-free contacts for 1st and 2nd alarm and calibration errors • Safety class: IP 65 • Relative humidity: 0... 95 % • Explosion protection: ATEX II 2 G EEX dem [ib] IIC B T4 • On-site calibration through alphanumerical display • Adjustable linearization for methane, ethane and propane • Adjustable measurement range: 5%...100 % of the explosive limit 1000.....9999 ppm, 1.....4.4 Volume-%  (varies to the type of gas) • Gas access with diffusion • Output signal: 0/4.....20 mA DC • Measurement of the explosive gases and steam by means of the infrared absorption, excluding the inactive  sections Land sensor shall feature: Objective: To supervise the explosive gases. Detector units shall be installed in each building with a hazard of  explosion. These use an infrared light absorption principle to determine methane concentration in the air. Once  the concentration reaches a certain level, an acoustic and optical alarm shall be given.  8.8.18 Explosive Atmosphere Detector  8.8.17 Temperature transmitter  46 of 124  Construction of Giresun Wastewater Treatment Plant  Tender Dossier Volume 3 Employer’s Requirements  Section 08: Electrical Works  • The transmitter shall have functional testing in the installed state without interrupting the process.  • The transmitter shall continuously supplies data - Draw conclusions, Schedule servicing in time,  monitor the process or product quality.   The temperature range shall as minimum be 0-50  C with an accuracy better than 0.5 %.  It shall be provided as industrial type and LIYCY screened.   Insulation resistance ≥100 MΩ at ambient temperature.  Insulation resistance between each terminal and the sheath is measured with a voltage of 100 V DC.  Highest possible compatibility with a design according to DIN 43772  IEC 60751 requirements stating a shock and vibration resistance of within a range of 10...500 Hz.   Device will include Neck tube for heat protection of head transmitter