Oil/air cooler BLK ATEX-3GD Drives and hydraulic aggregates are also used in explosive areas in machine construction or raw material production. In hydraulic systems oil transfers power and motion, in drives it’s a vital lubricant. Both as a power transfer medium and lubricant oil is heated by friction losses during operation. Oil/ air coolers stabilise the temperature and are indispensable for systems and drives for consistent power. The temperature further affects the ageing behaviour and the life of oils. BLK ATEX 3GD series coolers are suitable for use in zones 2 (gas) and 22 (dust) and temperature class 3. In addition to adequately protected drive motors they have stainless steel fan housings. ATEX area of application: up to zone 2 and zone 22 T3 Easy to maintain design Compact installation dimensions Low noise emission Broad performance range Rugged cooling matrix Efficient cooling matrixes, an easy to maintain design and noise-optimised fans are additional features of the BLK ATEX series.

BLK ATEX-3GDIntroduction and description Why coolers? There are basically two main concepts in the development of fluid power systems. One is to design systems without using a cooler, and if operational conditions show that the system needs a cooler, install it later at additional costs. This understandably then often calls for compromises, making the system more expensive. The other concept recognizes that a system originally designed with an integrated cooler needs less installation space and is a better choice with respect to construction and system costs. Why Buhler? If an oil/air cooler...

Gc Dc Equipment protection level temperature Temperature class Explosion class Type of ignition protection Atmosphere (G = Gas, D = Dust) Device category 3 = Zone 2 (Gas) / Zone 22 (Dust) Equipment group Temperature class T3 ATEX mark Number of motor contacts Frame size If a bypass is desired, the information is added to the to the type designation: external bypass internal bypass internal temperature-dependent bypass 2 bar / 45 °C external temperature-dependent bypass 2 bar / 45 °C bypass value 2 bar, 5 bar, 8 bar Technical Data Cooling battery: Ventilation box, safety guard and motor brackets: Fan...

BLK ATEX-3GD Basic data BLK ATEX-3GDT3 (at a frequency of 50 Hz) Part no.* "Cooler models BLK2.4 bis BLK 4.4 operate at 50/60 Hz, BLK 5.4 to BLK 8.6 at 50 Hz (60 Hz models upon request). **DIN EN ISO 3744, Class 3 Calculation example and nomenclature Determination An oil/air cooler is determined in two steps: 1. Determining or selecting the cooler size 2. Determining the actual pressure loss toE [°C] tLE [°C] ETD [K] Pspez [kW / K] P [kW] Q [l/min] Co [kJ/kgK] q [kg/dm’] Inlet oil temperature Inlet air temperature Temperature differential: ETD = t0E - tLE specific cooling performance (see performance...

Correction k(visk) Viscosity (cSt) K(visk) Viscosity K(visk) Determining the actual pressure loss 1. Determine Ap from the pressure loss graph for oil flow rate Q and the selected cooler size. 2. Determine the viscosity from the type of oil and temperature. 3. Determine the correction factor k(visk) and multiply by Ap from step 1. DE350003 ◦ 06/2017 We reserve the right to amend specification. Buhler Technologies GmbH 5

T Connection G % for temperature switch 6 Buhler Technologies GmbH We reserve the right to amend specification. DE350003 ◦ 06/2017

BLK ATEX-3GD Functional diagram Standard Version BLK 2 Direction of flow left to right or vice versa. Direction of flow top left to bottom right or the exact opposite. The oil outlet is always on the opposite side. The second connection must be closed. Internal bypass IB/ITB (BLK 3-8) External bypass AB/ATB (BLK 2-8) The oil inlet and outlet are always on the same side. Connections on the opposite side must be closed. Oil inlet always at the bottom. Other connections must be closed. Oil outlet always on the opposite side. With bypass valve With temperature-dependent bypass valve We reserve the...