. BL50C N means number of plates. Length (mm): 525. Width (mm): 111. Thickness (mm): 10+2.4N. Weight (kg): 2.0 + 0.23N. Channel volume (L): 0.047 (N-2). Exchange area (m2): 0.050 (N-2). Working pressure: 3.0 Mpa. Testing pressure: 4.5 Mpa. Working pressure: -160grC ~ 225grC. BL50D . Length (mm): 525. Width (mm): 111. Thickness (mm): 10+2.5N. Weight (kg): 2.0+0.23N. Channel volume (L): 0.047(N-2). Exchange area (m2): 0.050(N-2). Working pressure: 3.0Mpa. Testing pressure: 4.5Mpa. Working pressure: -160grC ~ 225grC