Used Hyfra Water Cooler Cooling Unit for sale (39,279)

Condition: used, Year of construction: 2007, functionality: fully functional, type of input current: three-phase, input voltage: 400 V, type of cooling: water, Equipment: type plate available, Technical specifications: see nameplate (Figure 7) Dimensions: 1000 x 1000 x 1300 mm (L x W x H) Ljdpfxjwmptyj Afueac The machine can be tested and demonstrated live on-site. All information is subject to change without notice. Subject to prior sale.

Condition: used, Cooling unit, cooling water recooler, water chiller, chiller O. Hellwig Year of manufacture: approx. 1995 Cooling capacity: approx. 8 kW Rated power of cooling unit: 3 kW Refrigerant: R422D Water tank volume: approx. 35 liters Circulation pump flow rate: 40 liters/min Lsdopu R Ncepfx Afujac Pump output: 0.63 kW Water connections: 1/2 inch Power supply: 380 Volt, 50 Hz - Temperature setting via rotary potentiometer Space requirement (L x W x H): 1100 x 750 x 140 mm Weight: 285 kg

Condition: good (used), Year of construction: 2021, Eurodifroid RFI 100 Water Chiller The Eurodifroid RFI 100 water chiller is designed for the professional, constant cooling of water or glycol in industrial and research settings. Typical applications include cooling CNC machines, laser systems, laboratory test rigs, or process engineering systems (e.g., in the hydrogen/fuel cell sector) where precise medium temperature control (rated here for 20°C) is essential. Lodpfx Afozcm Hzouoac Typical Areas of Application Machine and tool cooling: Precise temperature control for test rigs, analytical instruments, or reactors in research institutes. Renewable energies / Process engineering: Cooling of mixing vessels or production systems where precise temperatures are required. Technical Data: Manufacturer: Eurodifroid (France) Model / Type: RFI100THIECHV3VIP [SYLFEN] Product Type: Industrial water cooler / chiller / cooling unit Cooling capacity: 7,000 watts (7 kW) at 20°C outlet / 32°C ambient Operating voltage: 400 V / 3-phase / 50 Hz Power consumption: 5,140 W (5.14 kW) Rated current / Starting current: 9.9 A / 51.8 A Required fuse protection: 12 A Refrigerant: R513A (charge: 2.65 kg) Tank volume: 100 liters (2x 50 L) Pump flow rate: 3 – 50 l/min Pump pressure: 0.2 – 3.7 bar Max. pressure (HP / LP): 30 bar / 19 bar Operating range (ambient): -10°C to +50°C Noise level: 69 dBA Year of manufacture: 03/2021 Weight: 295 kg You can find more items—new and used—in our shop! International shipping costs available upon request!

Condition: used, Year of construction: 2020, functionality: fully functional, machine/vehicle number: NTC20 - 14720, cooling capacity: 21 kW (28.55 HP), type of input current: three-phase, type of cooling: water, overall weight: 225 kg, input voltage: 400 V, total width: 950 mm, total length: 1,080 mm, total height: 1,400 mm, warranty duration: 3 months, input frequency: 50 Hz, Equipment: type plate available, Air-cooled chiller / water chiller, Type: NOVATECH NTC 20 NOVATECH NOVATECH NTC 20 are air-cooled compact water chillers suitable for indoor/outdoor installation (IP 54). Includes a shell-and-tube evaporator, 110-liter buffer tank, and built-in circulation pump. Galvanized steel frame, hot-painted with polyester powder. Ledowcflwepfx Afueac Special features: - Mounted expansion tank for internal water only - Shut-off valve between water inlet and outlet - Water outlet balancing valve Cooling capacity: 21 kW Cold water temp. Outlet/Inlet (°C): 15 / 20 Flow rate (l/min) max. 100 Available pump pressure (bar) max. 3.3 Ambient temperature (°C) 35 Refrigerant: R 410A Electrical data: Voltage: 400 V, Frequency: 50 Hz, Phases: 3 Max. power consumption (kW) 8.85 Max. current (A) 12.5 Starting current (A) 19 Protection class: IP54 Dimensions: Length (mm) 1080, Width (mm) 950, Height (mm) 1400 Weight (kg) 225 Connection: Rp 1" Serial no.: 14720 Year of manufacture: 2020 Condition: Visually 1-2, Technically OK Used, like new Price: Available upon request in euros (plus VAT from Nettetal) – 3-month warranty Used machines may have cosmetic defects due to use. (Subject to technical changes and prior sale!) Location: MTA Deutschland GmbH, 88131 Lindau

Condition: new, Year of construction: 2022, functionality: fully functional, machine/vehicle number: PNG2 3201HE - 2200xxxxxx, cooling capacity: 354 kW (481.31 HP), type of input current: three-phase, type of cooling: water, overall weight: 3,765 kg, ambient temperature (max.): 46 °C, ambient temperature (min.): -20 °C, input voltage: 400 V, pressure: 3 bar, temperature: 7 °C, volume flow: 60.4 m³/h, pump pressure: 3.18 bar, total width: 2,190 mm, total length: 3,465 mm, total height: 2,425 mm, warranty duration: 12 months, input frequency: 50 Hz, Equipment: type plate available, Process chiller / air-cooled water chiller Type: Phönix PNG2 3201 HE Manufacturer: MTA S.p.A. The Phönix PNG2 3201 HE are compact water chillers suitable for outdoor installation. The unit is Eurovent certified. Equipment: - HE version, xDRIVE controller - Operating ambient temperature down to -20°C, EC brushless fans - Buffer tank and P3 pump - Compressor inlet/outlet valves - Filters at condenser coils - NO microchannels Cooling capacity (kW): 354 Chilled water temperature out/in (°C): 7 / 12 Flow rate (m³/h): 60.4 Available pump head (bar): 3.18 Ambient temperature (°C): 35 Refrigeration circuit: Refrigerant R513A, GWP 631, safety classification A1 Number of circuits: 1 Number of compressors: 1 Capacity control (%): infinitely variable from 25 to 100 Electrical data: Voltage: 400 V, Frequency: 50 Hz, Phases: 3 Max. power consumption (kW): 170 Max. current (A): 277 Laedpfxjxay H Ue Afuec Starting current circuit (A): 453 Protection class: IP54 Dimensions: Length (mm): 3465, Width (mm): 2190, Height (mm): 2425 Weight (kg): 3767 Connection: Victaulic DN 100 Serial no.: 2200xxxxx Year of manufacture: 2022 Condition: Visually excellent, technically ok Stock item, new Price: on request in EUR (plus VAT, ex works MTA Italy) – 12-month warranty (Subject to technical changes and prior sale!) Location: MTA, Tribano

Condition: used, Year of construction: 2018, functionality: fully functional, machine/vehicle number: GLT135SHE -2200333157, cooling capacity: 354 kW (481.31 HP), type of input current: three-phase, type of cooling: water, overall weight: 4,428 kg, ambient temperature (max.): 46 °C, ambient temperature (min.): -20 °C, input voltage: 400 V, pressure: 3 bar, temperature: 7 °C, volume flow: 60.7 m³/h, pump pressure: 2.51 bar, total width: 2,190 mm, total length: 4,530 mm, total height: 2,425 mm, warranty duration: 3 months, Equipment: type plate available, Process Chiller / Air-cooled Chiller, Type: Galaxy GLT 135 SHE Manufacturer: MTA S.p.A. The Galaxy GLT 135 SHE units are compact air-cooled chillers designed for outdoor installation (operational from -20°C to +43°C). Features include a plate evaporator, scroll compressors, control and switch cabinet, compressor shut-off valves, equipment suitable for low ambient temperatures down to -20°C (EC fans), P2 pump, 510-liter buffer tank, electric frost protection heater, condenser filter mats including Victaulic couplings. Cooling capacity (kW): 354 Chilled water temperature out/in (°C): 7 / 12 Flow rate (m³/h): 60.7 Available pump pressure (bar): 2.51 Ambient temperature (°C): 32 Refrigeration circuit: Refrigerant: R 410A Number of refrigeration circuits: 2 Number of compressors: 6 Capacity steps (%): 0-17-33-50-67-83-100 Electrical data: Voltage (V): 400, Frequency (Hz): 50, Phases: 3 Max. power input (kW): 167.7 Max. current (A): 273.3 Starting current per circuit (A): 421.8 Protection class: IP54 Dimensions: Length (mm): 4530, Width (mm): 2190, Height (mm): 2425 Weight (kg): 4428 Connection: Victaulic DN 125 Serial number: 2200333157 Year of manufacture: 2018 Condition: Cosmetically: 2, Technically: OK & tested Used Price: on request in EUR (plus VAT, ex works Nettetal) – 3 months warranty MTA offers, upon request, a functional test of the chiller together with the buyer prior to collection at the Nettetal branch. Used machines may have visual imperfections due to previous use. Ledpfx Afoxqnydsusac (Subject to technical changes and prior sale!)

Condition: new, Year of construction: 2023, functionality: fully functional, machine/vehicle number: PNG2 2501HEX-special - 2200xxxxxx, cooling capacity: 270 kW (367.10 HP), type of input current: three-phase, type of cooling: water, overall weight: 3,767 kg, ambient temperature (max.): 46 °C, ambient temperature (min.): -10 °C, input voltage: 400 V, pressure: 10 bar, temperature: 7 °C, volume flow: 46.3 m³/h, total width: 2,190 mm, total length: 3,465 mm, total height: 2,425 mm, warranty duration: 12 months, input frequency: 50 Hz, Equipment: type plate available, Process chiller / Air-cooled chiller unit Type: Phönix PNG2 2501 HEX Special Manufacturer: MTA S.p.A. The Phönix PNG2 2501 HE models are compact water chillers suitable for outdoor installation. The unit is Eurovent certified. Equipment features: - xDRIVE controller system - Microchannel condenser coil - Sound-insulated compressor housing - Oversized evaporator and coil; evaporator flow rate: 35 m³/h / 88 m³/h Cooling capacity (kW): 270 Chilled water outlet/inlet temperature (°C): 7 / 12 Flow rate (m³/h): 46.3 Available pump head (bar): 0 Ambient temperature (°C): 35 Refrigeration circuit: - Refrigerant: R513A, GWP 631, safety classification A1 - Refrigeration circuits (number): 1 - Compressors (number): 1 - Capacity control (%): stepless from 25 to 100 Electrical data: - Voltage (V): 400 - Frequency (Hz): 50 - Phases: 3 - Max. power input (kW): 122 - Max. current (A): 201 - Starting current (A): 314 Lsdpfx Aexazidefusac - Protection class: IP54 Dimensions: - Length (mm): 3465 - Width (mm): 2190 - Height (mm): 2425 - Weight (kg): 3767 - Connection: Victaulic DN 100 Serial No.: 2200xxxxx Year of manufacture: 2023 Condition: visually excellent, technically good Stock unit, new Price: on request in EUR (plus VAT, ex works MTA Italy) – 12 months warranty (Technical modifications and prior sale reserved!) Location: MTA, Tribano

Condition: used, Cooling unit cooling water cooler ARO type VWK 31/1-S Factory number year of manufacture 2007 Cooling capacity 3500 watts Ambient temperature max. 32°C Refrigerant R407C Refrigerant filling quantity 0.98 kg Operating pressure of cooling compressor max. 29.5 bar Water tank capacity approx. 8 liters Discharge volume of circulation pump 27 liters/min. (1620 liters/h) Lasdpfx Asvw A T Nofuec Water connections quick release coupling Rectus type 26 Power connection 230 volts, 50 Hz, 2.2 kW - Temperature setting via DANFOSS thermostat controller - Built-in circulation pump (250 watts) Space requirement L x W x H 700 x 550 x 520 mm Weight 75 kg Good condition

Condition: used, Power source for orbital welding machine MESSER GRIESHEIM - POLYSOUDE PS204 Water cooling unit for orbital welding machine MESSER GRIESHEIM - POLYSOUDE RC200 Welding power source, inverter welding machine POLYSOUDE PS 204 + RC 200 Year of manufacture: 1997 Power source serial no.: 9885186 Cooling unit serial no.: 97861? Output: 200 amps = 20% duty cycle 90 amps = 100% duty cycle Power supply: 230 volts, 50 Hz, Schuko plug - Remote control cable type BP 1436 with 7.5 m connection cable - Adjustable output from 1 to 200 amps - DC only - HF ignition - Cooling water unit for torch cooling - 44,895 operating hours (read) - Operating and maintenance manual included Space requirements welding machine (L x W x H): 550 x 360 x 500 mm Space requirements cooling unit (L x W x H): 550 x 360 x 550 mm Weight welding machine: 45 kg Weight cooling unit: 25 kg Good condition Lsdpfx Ajt Awm Dofusac Sold without accessories The price refers to a set consisting of 1x power source and 1x water cooler.

Condition: used, Cooling unit, water-cooled condenser, DALEX Type DRF 2 Machine No. 38913719, Year of manufacture 1989 Flow rate 0.35 m3/h Cooling capacity 1950 Watts Operating pressure 2 to 3 bar Refrigerant R 134a; unit was converted from R12 to R134a Operating overpressure 18 bar Pipe connection thread 3/4" Tank volume 600 x 400 x 350 mm = approx. 80 liters Mains connection 380 Volts, 50 Hz Space requirement L x W x H 900 x 800 x 1020 mm Weight 100 kg Good condition Lasdpfeg D H Ruox Afujc

Condition: used, MF welding machine with water-cooled projection welding head Medium-frequency projection welding head Manufacturer: TECNA (Italy) Model 3670 E CF00 Serial No.: Year of manufacture 2014 Rated welding power 25 kVA Max. welding power 160 kVA Mains connection 400 Volt, 50 Hz - Welding control TE750 or TE760 - Projection welding head for single-sided spot welding - Ideal for repair work in the bodywork area, ensuring the best welding quality - Water-cooled, type 2BHPLN - Mobile transport trolley Lsdog U A Uzjpfx Afueac Weight approx. 155 kg Very good condition - like new

Condition: used, Power source for orbital welding machine MESSER GRIESHEIM - POLYSOUDE PS204 Water cooler for orbital welding machine MESSER GRIESHEIM - POLYSOUDE RC200 Welding power source, inverter welding unit POLYSOUDE PS 204 + RC 200 Year of manufacture: 1996 Serial number welding source: 9785153 Serial number cooling unit: 968628 Output: 200 amps = 20% duty cycle 90 amps = 100% duty cycle Mains connection: 230 volts, 50 Hz, Schuko plug - Note: Display on the power source becomes illegible after some time - Remote control cable type BP 1436 with 7.5 meter connection cable - Adjustable output from 1 to 200 amps - DC only - HF ignition - Cooling water unit for torch cooling - 118,643 operating hours (read off) - Operating and maintenance manual Space requirement welding machine (L x W x H): 550 x 360 x 500 mm Space requirement cooling unit (L x W x H): 550 x 360 x 550 mm Ledpfeyhq A Rex Afueac Weight welding machine: 45 kg Weight cooling unit: 25 kg Good condition Note: Display on power source becomes illegible after some time Without accessories Price applies to one set consisting of 1x power source and 1x water cooler.

Condition: excellent (used), Year of construction: 1993, functionality: fully functional, type of input current: three-phase, input voltage: 400 V, overall weight: 390 kg, cooling capacity: 9.5 kW (12.92 HP), Coolling water recooler Lajdpfx Afew D T T Eeuec cooling capacity: 6 kW weight: 110 Kg.

Condition: like new (used), Rittal Ljdsuy N Nmjpfx Afusac Type: SK 3336.509 Technical details: Voltage 3/400V 50 Hz Max. current 6.7 A Starting current 30.4 A Nominal cooling capacity 5040 W Max. power consumption 3340 W Refrigerant R134a 2.2 kg Temperature range +15 / +43 C° 150 kg Condition: gebraucht / used Scope of delivery: (see picture) (Changes and errors in the technical data, specifications are reserved!) We will be happy to answer any further questions you may have on the phone.

Condition: good (used), Year of construction: 2004, EMA high frequency welding unit with cold water chiller EMA High Frequency Welding Unit MFA with Thermotec PT2000 water cooling system Welding unit range 0 - 1000 ° C MF output: 80A Frequency MF-Gen.: 10 KHz Mains connection: 380V 106 A foot pedal Water cooling, cold water chiller Thermotec PT2000 Dimensions approx. L1500x W730x H1900mm Volume 1730 Ltr. Year: 2004 The drip pan is not included in the scope of delivery. Financing through our bank is also possible. komplett-konzept.leasingo.de More articles - new and used - can be found in our shop! International shipping costs on request! Laodpfod Tv H Dox Afuec

Year of construction: 1997, condition: good (used), Chiller, cooling water circuit, heat exchanger, cooling for spot welding equipment, spot welding machine, spot welding system, spot welding gun, cooling unit -Individual components: see photos -Manufacturer: Deltatherm, Deltatherm Type: DE-HI -Power: 1.7 kW -Dimensions: 1300/800/H1760 mm -Weight: 321 kg Lasdpfxjzcwu Ns Afujc

Condition: excellent (used), DELTATHERM LT 5.5 Process Chiller Manufacturer: DELTATHERM Type: LT 5.5 Year of manufacture: 06/2021 Process chiller / industrial chiller for water and glycol cooling. Suitable for machine cooling, machine tools, laser systems, test benches, production systems, and industrial applications. Technical data Cooling capacity: 6 kW Cooling medium: Water / Glycol Tank capacity: 30 liters Refrigerant: R407C Refrigerant charge: 1.8 kg Max. operating pressure: 28 bar Max. ambient temperature: 42 °C Connection voltage: 400 / 460 V Frequency: 50 / 60 Hz Connected load: 5.3 kW Operating current max.: 9.1 A Max. circuit breaker rating: 16 A Protection class: IP54 Pump capacity: 20 l/min Pump pressure: 3.0 bar Dimensions (W x D x H): approx. 600 x 600 x 1296 mm Weight: approx. 140 kg Equipment Digital temperature controller Integrated water tank Air-cooled condenser Industrial design on rollers Water/glycol operation Main switch on the front of the unit Condition Lasdpfx Afszcx Hgjuoc Used equipment. Signs of wear and tear due to age and use. Optical condition as shown in the pictures. Scope of delivery 1x DELTATHERM LT 5.5 process chiller Accessories as shown in the pictures Shipping or freight shipping possible. Subject to changes, errors and prior sale. We will be happy to answer any further questions by telephone.

Condition: good (used), Year of construction: 2005, functionality: fully functional, cooling capacity: 47 kW (63.90 HP), type of input current: three-phase, overall weight: 240 kg, noise level: 34 dB, input frequency: 50 Hz, Equipment: freezer, Ciat Dynaciat LGN 120 CIAT DYNACIAT LGN120 liquid chiller without condenser. manufacturer: CIAT DYNACIAT year of manufacture: 2005 Lasdpfxsvzrxce Afusc Electronic control cooling capacity: 34/47kw Compressor 1pc - Hermetic SCROLL type SZ125S4CC refrigerant R407C Evaporator - Brazed plate heat exchanger heat exchanger capacity: 4.2 liters - Plate patterns optimized for high efficiency - 19 mm armaflex thermal insulation connection: 1.5" machine dimensions: height: 121cm full core: 160cm width:79cm length:88cm weight: 190kg - Electronic expansion valves - Service valves on the liquid line ■ Control and safety devices - Water temperature control sensors - Evaporator frost protection sensor - Factory-installed evaporator water flow regulator - 24V control circuit - Connect the Touch microprocessor-controlled electronic control

Condition: good (used), Year of construction: 2009, functionality: fully functional, cooling capacity: 495 kW (673.01 HP), type of input current: three-phase, type of cooling: air, overall weight: 4,550 kg, input voltage: 400 V, total width: 2,450 mm, total length: 5,050 mm, total height: 2,750 mm, input current: 170 A, input frequency: 50 Hz, Equipment: compressor, freezer, Used, well maintained Trane RTAC 140 Air-cooled Helical-Rotary Liquid Chiller Brand Trane RTAC 140 Product type Air Cooled Chiller Capacity kW 491.9 Refrigerant HFC 134a Refrigerant Circuits 2 Evaporator Model EH140 2x Trane CHHP012TKEON092A compressors Water Storage l 112 Minimum Flow l/s 13 Maximum Flow l/s 44 Number of water passes 2 Condenser Fans Quantity (1) 4/4 Diameter mm 762 Ledet Tfbqepfx Afusac Total Air Flow 35.45 m3/s Refrigerant Freon Refrigerant Type R 134 A 74kg Weight in kg. 4500 Sizes 5041x2260x2750mm (LxWxH)

Condition: used, Technical details: voltage: 360-730 / 50 V / Hz weight of the machine ca.: 0,150 t Lsdeu N Afyepfx Afusac *

Condition: used, - Dimensions: 1050 x 660 x 990 mm Lajdpew Ducbjfx Afuec - Empty weight: 62 kg - Operating weight: 192 kg - Precise water cooling down to +0.5°C, ideal for bakery and pastry applications - Double-walled insulated stainless steel tank, useful volume: 135 litres - Easy cleaning: rounded corners, hygienic and accessible design - Water flow rate up to 10 L/min (gravity-fed) - Includes DMA dosing kit for precise water metering in your recipes

Condition: used, Dimensions: 880 × 560 × 1120 mm Brand: Arévalo Model: T.E.A.-175 Type: Vertical water chiller Capacity: 175 litres Voltage: 220 V / 50 Hz Rated power: 746 W Plug power: 0.75 kW Refrigerant: R404A Refrigerant charge: 0.625 kg Net weight: 88 kg Lasdpfx Afsy Nnv Eeuoc

Condition: new, Year of construction: 2026, The device is designed to cool tubes in CO2 laser plotters thanks to the use of a cooling unit. The CW3000 chiller keeps the water temperature at the right level. Thanks to such cooling, the tube has stable operating parameters. The CO2 chiller ensures optimal working conditions of the tube, effectively protecting it against overheating and damage. The device is intended for people / companies where a laser plotter is an everyday work tool. Technical data Voltage 230 V Power consumption 0,45 A Cooling efficiency 50 W Container capacity 9 L Connections (inlet/outlet) 10 mm Maximum working height 10 m Maximum flow 10 L/min Weight 9,5 kg Dimensions 49 x 27 x 38 cm Security: - Compressor overvoltage protection - Alarm for incorrect water flow in the system - Over temperature alarm Laodpfx Afey Sg H Ieuec The price is a net price. Price does not include shipping costs.

Condition: used, Year of construction: 2021, functionality: fully functional, machine/vehicle number: AST2 190HE-MWT - 2200370969, cooling capacity: 539 kW (732.84 HP), type of input current: three-phase, type of cooling: water, overall weight: 5,098 kg, ambient temperature (max.): 46 °C, ambient temperature (min.): -20 °C, input voltage: 400 V, pressure: 3 bar, temperature: 7 °C, volume flow: 92.1 m³/h, pump pressure: 3.4 bar, total width: 2,191 mm, total length: 5,445 mm, total height: 2,423 mm, warranty duration: 3 months, Equipment: type plate available, Process Chiller / Air-Cooled Chiller Unit Type: Aries TECH AST2 190 HE-MWT – 539 kW Manufacturer: MTA S.p.A. The Aries TECH AST2 190 HE-MWT are compact air-cooled chiller units suitable for outdoor installation (from -20°C to +48°C), equipped with a shell-and-tube evaporator, six scroll compressors, compressor shut-off valves, crankcase heater, phase monitoring, P3 twin pump, 800-liter buffer tank, electric frost protection heater, EC fans, condenser filter, and control panel. Comes with a new condenser coil. Chilled water outlet temperatures adjustable from -10°C to +20°C. Cooling capacity (kW): 539 Chilled water temperature out / in (°C): 7 / 12 Flow rate (m³/h): 92.1 Available pump pressure (Bar): 3.4 Ambient temperature (°C): 32 Refrigeration circuit: Refrigerant: R 410A Number of refrigeration circuits: 2 Number of compressors: 6 Number of capacity stages: 6 Electrical data: Voltage: 400 V, frequency: 50 Hz, phases: 3 Max. power consumption (kW): 261 Max. current (A): 431 Laodpfx Aox E S S Njfusc Starting current per circuit (A): 636 Protection class: IP54 Dimensions: Length (mm): 5445, Width (mm): 2191, Height (mm): 2423 Weight (kg): 5098 (operating weight) Connection: DN 125 (Vitaulic) Serial no.: 2200370969 Year of manufacture: 2021 Condition: Cosmetic 2, Technically OK (Used machine) Price: on request in EUR (plus VAT, ex works Nettetal) – 3-month warranty Used machines may show visual imperfections due to previous use. (Subject to technical changes and prior sale!) Location: MTA Deutschland GmbH, 41334 Nettetal

Condition: used, Container capacity: 75 l Coolant pump, immersion depth: 110 mm 1 fan for each heat exchanger Electrical connection: 380 V Lsdpsckc Upsfx Afujac Space requirement: 650 x 400 x 900 mm Weight: 32 kg