Off-line cooler BNK 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. BNK 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 are designed for easy maintenance and have a noise-optimised fan. ATEX area of application: up to zone 2 and zone 22 T3 Easy to maintain design System-compatible cooling matrix / flow rate ratio Low noise emission Rugged cooling matrix High suction pump Compact installation dimensions To minimise the negative fluctuating oil flow has on the cooler design with varying ambient air temperatures, the BNK ATEX series features a built-in gerotor pump to circulate the oil.

BNK ATEX-3GDIntroduction and description Why coolers? In many cases, installing an off-line cooler is not only an emergency solution, but also the best solution with respect to mechanics and economics. Oftentimes off-line filtration can also be incorporated quite effectively. Since a bypass also always requires installation of a separate circulation pump, it’s reasonable to combine it with the motor already installed for the fan. The BNK series is a tiered line of oil/air coolers with circulation pump directly flange-mounted. The cooler size and pump flow rate are coordinated for performance...

BNK ATEX-3GD Ignition protection mark explanation 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 Motor power Pump output per litre Number of motor contacts Frame size If a bypass is desired, the information is added to the to the type designation: Bypass version AB (BNK 2-7) external bypass internal bypass internal temperature-dependent bypass 2 bar / 45 °C external temperature-dependent bypass 2 bar / 45...

BNK ATEX-3GDBasic data BNK ATEX-3GDT3 (at a frequency of 50 Hz) Part no.* ’Cooler models BNK2.4-15 to BNK 4.4-90 operate at 50/60 Hz, BNK 5.4-90 to BNK 7.4-90 at 50 Hz (60 Hz models available upon request). **DIN EN ISO 3744, Class 3 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 curves): Pspez = P / ETD Cooling performance in kW Oil flow rate Specific heat capacity of the oil (approx. 2.0 kJ / kgK) Gravity of oil = 0.9 kg/dm’ (V)...

BNK ATEX-3GDDimensions T Connection G % for temperature switch DE360003 ◦ 06/2017 We reserve the right to amend specification. Buhler Technologies GmbH 5

BNK ATEX-3GD Functional diagram Standard version BNK 2 The oil inlet is on the left of the cooling battery. The oil outlet is The oil inlet is on the bottom left of the cooling battery. The always on the opposite side. second connection at the top must be closed. The oil outlet is always on the opposite side. Internal bypass IB/ITB (BNK 3-7) External bypass AB/ATB (BNK 2-7) The oil inlet and outlet is always on the same side of the cooling The oil inlet is always at the bottom left of the cooling battery. battery. The connection on the opposite side must be closed. The second connection must...