• 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. 

## 8.8.17 Temperature transmitter 

 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. 

 IEC 60751 requirements stating a shock and vibration resistance of within a range of 10...500 Hz. 

 Highest possible compatibility with a design according to DIN 43772 

 Device will include Neck tube for heat protection of head transmitter 

## 8.8.18 Explosive Atmosphere Detector 

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. 

Land sensor shall feature: 

• Measurement of the explosive gases and steam by means of the infrared absorption, excluding the inactive sections 

• Output signal: 0/4.....20 mA DC 

• Gas access with diffusion 

• Adjustable measurement range: 5%...100 % of the explosive limit 1000.....9999 ppm, 1.....4.4 Volume-% (varies to the type of gas) 

• Adjustable linearization for methane, ethane and propane 

• On-site calibration through alphanumerical display 

• Explosion protection: ATEX II 2 G EEX dem [ib] IIC B T4 

• Relative humidity: 0... 95 % 

• Safety class: IP 65 

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 

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. 

