Standard_Parts_Catalogue

Page 1550 | 3.5 Controlling, Venting, Sealing of Liquids and Gases Oil sight glasses GN 541 have very high mechanical strength. This allows them to be relatively thin while offering a large viewing window. These oil sight glasses can also be used in tanks which are pressurised. Test results are available to verify the pressure resistance. Assembly instruction: For mounting on walls of less than 4 mm thickness please use mounting nuts GN 7430. Information GN 541 Oil Sight Glasses Crystal-Clear Plastic 1 d 1 2 d 2 3 Type How to order 1 2 3 GN541-18-M25x1,5-A 3 Type A With reflector B Without reflector • Plastic Crystal-clear Polyamide (PA-T) - - Ageing resistant - - High mechanical strength, but not suitable for alcohol - - Temperature resistant up to 100 °C - - Solvent resistant, but not suitable for alcohol • Seal Rubber NBR (Perbunan ® ) • Reflector Aluminum Natural color, anodized • Elastomer Characteristics → Page 2158 • Plastic Characteristics → Page 2158 • RoHS Specification • Mounting Nuts GN 7430 → Page 1632 Accessory 1 2 d 1 Viewing window d 2 d 3 l 1 l 2 s Recommended tightening torque in Nm 11 M 16 x 1,5 22 8 7 19 2 ...  3 14 M 20 x 1,5 26 9,5 8 22 8 ... 10 18 M 25 x 1,5 31,5 8 9 27 8 ... 10 18 M 26 x 1,5 31,5 13 9 27 8 ... 10 20 M 27 x 1,5 31,5 9 9 27 8 ... 10 22 M 30 x 1,5 35 9 10 30 8 ... 10 25 M 35 x 1,5 40 11 10 34 8 ... 10 30 M 40 x 1,5 47 11,5 13 40,5 8 ... 10 1 2 d 1 Viewing window d 2 d 3 l 1 l 2 s Recommended tightening torque in Nm  9 G 1 ⁄ 4 18 10 6 15 2 ...  3 11 G 3 ⁄ 8 22 7,5 7 19 3 ...  5 14 G 1 ⁄ 2 26 10,5 8 22 4 ...  6 20 G 3 ⁄ 4 31,5 10,5 9 27 6 ...  8 25 G 1 40 11 10 34 8 ... 10 30 G 1 1 ⁄ 4 47 11,5 13 40,5 8 ... 10 Original design HFTX.