Used Db Engineering Traserscreen Db-40Xl for sale (21,169)

Condition: used, Year of construction: 2005, Second-hand machine Year of manufacture: 2005 Features and technical specifications: - Motor: 400 V, 50 Hz, 3-phase, 1.5 kW - Pneumatic single-head drilling machine with 23 spindles - Aluminium ruler with 4 stops (2 profiles on the right/left, 1500 mm each) - with quick-action chuck - 2 patented, accident-proof pressure clamping cylinders - Connection for extraction system in accordance with EC standards - Aluminium drilling beam, spindle centre distance 32 mm - Work table made of MDF and cast iron - Patented spiral system for fine adjustment of the drilling depth - Pneumatic drilling head oscillation with Lockable in any position between 0° and 90° - Fold-down side stops with fine adjustment via counters with decimal display - Drilling height adjustment via dial gauges with decimal display - Back stop, travel up to 300 mm - Fixed stops 37 mm for fitting pot-type band drills - Complies with EC standards - Max. drilling width 704 mm - Max. drilling depth 65 mm - Max. workpiece width 960 mm - Max. workpiece length 3000 mm - Max. workpiece thickness 60 mm Availability: at short notice Storage location: 63934 Röllbach Prsdpfxjzk N S Uo Airjc

Year of construction: 2024, condition: used, Manufacturer : IMMEQUIP Engineering Model : CEMH-LAM360 Year : 2024 Type : Cutter / Laminator Structure & design: All-stainless steel 304L mechanically welded frame Fitted with 4 swivel wheels with brakes Fully enclosed machine (compliant with 2006/42/EC) Access secured by coded magnetic sensors Dimensions Longueur totale : 3550 mm Hauteur tapis entrée : 1025 mm (±15 mm réglable) Hauteur tapis sortie : 737 mm Largeur bandes : 360 mm Convoyage : Tapis d’entrée - Bande NEOBELTING silicone blanc - Température max : 90°C en continu - Vitesse : 17 m/min - Motorisation : 0,37 kW – triphasé 400V - Option fournie avec la machine : guidage produits par peigne inox + rouleaux presseurs (voir photo) Conveyor system: Exit conveyor - White silicone NEOBELTING belt - Speed: 43 m/min - Motor: 0.37 kW – three-phase 400V - Integrated air blow-off ramp Cutting unit - Cutting wheel Ø350 mm - 3 blade holders (45° and 90°) - Hardened and ground steel blades (Z30C13 – 40/42 HRC) - Rotation speed: 72 rpm - Motor: 0.37 kW – three-phase 400V - Stainless steel housing with adjustable pressure roller - Stainless steel roller guide Psdpjy D Ugyefx Airsrc - Cutting kit options: 90° and 45° Product orientation kit: 2 symmetrical sets, each comprising 1 cell, 1 stop flap and 1 pneumatic cylinder Laminating / rolling function - Hollow stainless steel roller, Ø140 x 350 mm - Motor: 0.12 kW - Speed: 29 m/min - Precise gap adjustment (1 to 30 mm) - Adjustable anti-clogging scraper Conveyor system: Intermediate conveyor - HABASIT belt, type WVT-140 - Speed: 29 m/min - Motor: 0.18 kW - Stainless steel drum, Ø44 mm - Tension and position adjustment Power supply: Three-phase 400V – 50 Hz SIEMENS G120C frequency converters (x5) SIEMENS 7-inch operator display (HMI) Full machine control Buzzer + power-on indicator light Emergency stop buttons (including 1 on the cutting unit side) Technical documentation available

Year of construction: 1997, condition: excellent (used), functionality: fully functional, machine/vehicle number: 697/2, Equipment: 4th hydraulic function, Hounsell Engineering 50 Tonne 4-Column Hydraulic Press – 1997 We are pleased to offer this Hounsell Engineering Ltd (UK) 50-tonne 4-column hydraulic press, manufactured in 1997. A substantial, British-built industrial hydraulic press with heavy-duty construction, previously used in a production environment and now available for sale due to surplus requirements. Suitable for a wide range of pressing, forming, assembly, fabrication, maintenance and general engineering applications. Machine specification: Manufacturer: Hounsell Engineering Ltd, UK Type: 4-Column Hydraulic Press Rated capacity: 50 tonnes Year of manufacture: 1997 Machine / Serial No.: 697/2 Stroke: 200 mm System pressure: 250 bar Pump motor: 5.5 kW Electrical supply: 415 V Control voltage: 110 V Hydraulic fluid: Texaco HD 32 Construction: Heavy-duty industrial steel Condition: Very good used condition The press was in service prior to removal and is being offered for sale as surplus equipment. With a rated capacity of 50 tonnes, the machine is capable of generating approximately 500 kN of compressive force, making it suitable for a broad range of industrial and workshop applications. Condition & Inspection The machine is offered in good used condition. Prospective purchasers are welcome and encouraged to inspect the press before purchase to satisfy themselves as to its condition, specification and suitability for their intended application. Sold as seen. No warranty is given or implied. Collection & Loading Prodpfx Asz Ib R Ijirjc Location: Kent, England, UK Collection only due to the size and weight of the machine. Loading assistance may be available by prior arrangement. Further photographs and information can be provided, including serial plate details, overall dimensions, weight and loading arrangements. A good opportunity to acquire a substantial 50-tonne industrial hydraulic press at considerably below the cost of a comparable new machine. Please contact via the links within for further details, photographs, or to arrange an inspection. Many Thanks, Search terms: Hounsell Hydraulic Press, 50 Tonne Press, 4 Column Press, Hydraulic Workshop Press, Industrial Press, Engineering Machinery, Pressing Machine, Forming Press, Manufacturing Equipment, Fabrication Machinery.

Year of construction: 2021, condition: used, Manufacturer : IMMEQUIP Engineering Model : CEMH-LAM360 Year : 2021 Type : Cutter / Laminator Structure & design: All-stainless steel 304L mechanically welded frame Fitted with 4 pivoting wheels with brakes Dimensions Longueur totale : 3550 mm Hauteur tapis entrée : 1025 mm (±15 mm réglable) Hauteur tapis sortie : 737 mm Largeur bandes : 360 mm Conveyor: Inlet conveyor - White silicone NEOBELTING belt - Maximum temperature: 90°C continuous - Speed: 17 m/min - Motor: 0.25 kW – three-phase 400V - Product guidance via stainless steel comb Conveyor system: Exit conveyor - White silicone NEOBELTING belt - Speed: 43 m/min - Motor: 0.37 kW – three-phase 400V - Integrated air blow-off ramp Cutting unit - Cutting wheel Ø350 mm - 3 blade holders (45° and 90°) - 3 ground hardened steel blades (Z30C13 – 40/42 HRC) – additional blades can be fitted - Rotational speed: 72 rpm - Motor: 0.37 kW – three-phase 400V - Stainless steel housing with adjustable pressure roller - Stainless steel roller guide - Cutting kit available: 90° and 45° Product orientation kit: 2 symmetrical sets, each comprising 1 cell, 1 stop flap and 1 pneumatic cylinder Rolling function - Non-motorised hollow stainless steel roller, Ø140 x 350 mm - Gap adjustment: manual - Adjustable anti-clogging scraper Power supply: Three-phase 400V – 50 Hz Predpfx Asy Dvpvsirsc Danfoss VLT frequency converters Operator display (HMI) Full machine control Buzzer + power-on indicator light Emergency stop buttons (including 1 on the cutting unit side) Electrical documentation available

Condition: ready for operation (used), We offer this ready for use B.I.P. Engineering BIPEL 150 T Rubber Vulcanising Press. Predez D Igbspfx Airsc It is currently installed so can be seen running in situation. We have attached a data sheet which shows the key Dimensions. Type: 150 FAOL Serial Number: 8620 Voltage: 440 V Phase: 3 Frequency: 50 Hz Apparent power: 100 kVA Price in GBP = £16,000 If you have any questions or need more information, feel free to send us a message or give us a call.

Condition: good (used), For sale: professional Vision Engineering Lynx Compact X6 stereo microscope, manufactured in the UK. This is a modern eyepiece-free microscope, providing a spatial 3D image without the need to place eyes against eyepieces – offering exceptional comfort for quality control and precision assembly tasks. Technical specifications: • Manufacturer: Vision Engineering Ltd. (UK) • Model: Lynx Compact X6 • Magnification: 6× (Compact X6 objective) • Type: stereo, eyepiece-free • Illumination: integrated LED in the base • Power supply: 230 V • Head with focus and height adjustment • Serial number: MFS 11572 • DGUV safety inspection – current safety test certification Condition: • Used item, optics are clean, mechanics fully operational. • Damaged upper cover of the plastic element (visible in photos) – does not affect operation or image quality. • Illumination is fully functional. • Device tested and ready for use. Applications: Laboratories, quality control, electronics, optics, and medical industries. Excellent for precision work, SMD soldering, PCB inspection, micromachining, and micromechanics. Psdpfjz Sli Ejx Airorc

Condition: used, Year of construction: 2021, Available in OEM version without manufacturer markings on the housing, or with markings. Price per unit; 15 units in stock (including OEM version – 13 units in stock). The Opto Engineering TC23144 is a professional bi-telecentric lens designed for use in machine vision systems, metrology, and precision measurement applications. Its bi-telecentric design ensures a constant magnification regardless of the object distance, minimizing perspective errors and image distortion. This makes the TC23144 model ideal for quality control systems, dimensional measurements, and automated industrial inspection. The lens is compatible with cameras equipped with sensors up to 2/3″ and offers a magnification of 0.061x and a C-mount. It is characterized by very high telecentricity, low distortion, and a large depth of field, which allows for repeatable and accurate measurement results, even in demanding industrial environments. Applications: - Machine vision systems, - Quality control and production inspection, - Industrial metrology, - Dimensional measurements, - Industrial automation, - Research and development (R&D) laboratories. Key parameters: Manufacturer: Opto Engineering Model: TC23144 Type: Bi-telecentric lens Maximum sensor size: 2/3″ Magnification: 0.061x Mount: C-Mount Working distance: 396 mm Working aperture: f/8 Telecentricity: < 0.05° Prsdpozi S Ivofx Airjc Distortion: < 0.04% Front diameter: 200 mm Weight: approx. 5.8 kg The device was used in applications related to vision systems and industrial measurements. If you have any questions or need further information, please send a message or contact us by phone.

Condition: excellent (used), functionality: fully functional, Feller hot runner controller, 70-channel. Prepared for expansion to 80 channels! In excellent condition, sourced from a cleanroom injection molding facility in the medical technology sector. Prjdpfx Aijzdu Hqerjc The original new price was over €20,000.

Condition: used, Year of construction: 2014, functionality: fully functional, Single-shaft machine. Dimensions of the feed hopper: 1300 x 1400 mm. Hydraulic pusher with adjustable pressure and speed, depending on the power consumption of the rotating drum. Drive via gear motor with V-belt. Robust rotor made of certified construction steel. Rotor width: 1300 mm. Hopper length: 1400 mm. Pjdpjx Anq Hjfx Airorc Rotor diameter: 368 mm. Main motor power: 30 kW. Teeth and counter-blades made from wear-resistant material. Replaceable reversible blades. Dimensions of reversible blades: 40x40x20 mm. Replaceable screen basket. Total weight: approx. 3,100 kg. Supply voltage: 380 V – 50 Hz.

Condition: used, pure engineering Prjdpfezd Ukiex Airec Type: pureGMC18 System for manual weighing processes Climate chamber for highly sensitive weighing processes with ultra-microbalances. The weighing chamber is specifically designed for the gravimetric determination of particulate emissions in exhaust gas analysis and meets the regulatory requirements of environmental authorities. All necessary climate control components are integrated. In combination with the particulate filter, a contamination-free and precisely conditioned weighing and storage area for the filters is ensured. Features: Precise temperature and humidity control Weather station (p, t, h) for buoyancy correction Dew point mirror (optional) Vibration-isolated granite for low-vibration mounting of an ultra-microbalance Ionization device against static charging Flow protection for shielding the weighing cell Touch panel for intuitive operation Ethernet interface for process data exchange Interior with power outlets, grounding bolt Advantages: Meets regulatory requirements for particle weighing according to: ECE-R83 (light duty), ECE-R49 (heavy duty), EPA1065 (U.S. Environmental Protection Agency) Tested, ready-to-connect design Designation: pureGMC18 Temperature: 22°C ± 1 K Humidity: 45% RH ± 3% Dimensions W/D/H: 1,800/800/1,980 mm Cleanroom class 5 (ISO14644-1) Voltage supply: 400V, 15A 50/60 Hz Weight: 650 kg Condition: used Scope of delivery: (See picture) (Changes and errors in the technical data are subject to change!) We will be happy to answer any further questions you may have by telephone.

Condition: used, Year of construction: 2007, functionality: fully functional, Machine available with or without camera system. New spindle integrated. Pjdsx Hyd Nepfx Airorc

Condition: used, Year of construction: 2018, functionality: fully functional, number of spindles: 35, SECOND-HAND MULTISPINDLE DRILL WITH 35 SPINDLES MAGGI BORING SYSTEM 35 YEAR 2018 Psdpfx Ajx Rcqgoirsrc - Center distance 32 mm.

Condition: excellent (used), Catalog number 8048 TECHNICAL DATA - max. disc diameter 400mm - disc bore diameter 30mm - disc guard - cutting height 100mm - max. cutting width 640mm - possibility of angled cutting in the vertical plane - arm adjustment or disc adjustment - arm rotation capability: right/left - motor 400V, 3kW - table dimensions 1600x950mm - dust extraction nozzle diameter 60, 100mm - dimensions (L/W/H) 1500x1600x1500mm - weight 240kg ADVANTAGES – Made in Italy – Unpainted – DTR documentation included – Very good condition – Used saw Net price: 9500 PLN Net price: 2209 EUR, depending on the exchange rate of 4.30 EUR Podpfxezx Sqps Airjrc (Prices are subject to change due to exchange rate fluctuations)

Condition: new, functionality: fully functional, Our state-of-the-art automatic tube filling machine is a versatile all-rounder, specifically designed to optimally support companies with the highest quality requirements. Thanks to its superior build quality and wide application range, it offers intuitive operation to efficiently and reliably optimise your tube filling processes. Powerful drives and a user-friendly colour touchscreen control system enable maximum flexibility for format and product changes, greatly simplifying your tube filling operations. The machine features memory slots for rapid and reproducible setting of all relevant machine parameters. Pedpjyq Hgkefx Airerc If you are looking to optimise your tube filling processes with strong production performance while maintaining high quality, Impuls Packaging is your ideal partner. System Overview Parameters: Power supply: AC 220V / 50Hz or 110V / 60Hz Power: 4 kW Filling range ● 2–5 ml ● 5–30 ml ● 10–140 ml ● 30–300 ml (customisable) Tube diameter: 10–50 mm (customisable) Tube length: 30–250 mm (customisable) Hopper volume: 50 L Filling accuracy: ±1 % Capacity: 40–60 tubes/minute Machine dimensions: 2050 × 900 × 1900 mm Net weight: 850 kg

Condition: used, functionality: fully functional, Year of construction: 2017, operating hours: 14,022 h, machine/vehicle number: 2621150, control type: CNC control, degree of automation: automatic, actuation type: hydraulic, controller manufacturer: VARIOBEND / ASCO, controller model: VARIOBEND Touch Control, working width: 6,400 mm, sheet thickness (max.): 1 mm, sheet thickness steel (max.): 1 mm, sheet thickness stainless steel (max.): 1 mm, sheet thickness aluminum (max.): 2 mm, back gauge adjustment: CNC-controlled, back gauge: 1,300 mm, overall weight: 8,800 kg, total length: 7,200 mm, total width: 2,150 mm, total height: 1,600 mm, input voltage: 400 V, input frequency: 50 Hz, type of input current: AC, year of last overhaul: 2025, Equipment: CE marking, angle stop, centralized greasing system, cone bending device, documentation/manual, emergency stop, foot remote control, We are offering for sale a VARIOBEND CNC sheet metal folding machine, manufactured by ASCO GmbH, Germany. The machine is currently owned by DIMING d.o.o., a company based in Slovenia, specializing in construction and sheet metal works. The machine is designed for precise and efficient sheet metal bending and is particularly suitable for roofing, façade construction and architectural sheet metal fabrication. Its robust construction and CNC-controlled operation ensure accurate, consistent and repeatable bending results, making it suitable for professional sheet metal processing. Prsdpfxoz Sz Txo Airsc We are upgrading our machinery and investing in a newer-generation folding machine. The machine is available for inspection in Slovenia by prior arrangement.

Condition: used, Multi-spindle drilling machine Maggi BS 35 2/26. Prjdpfxozkh Rce Airsc

Condition: excellent (used), Year of construction: 2008, functionality: fully functional, Belt Fryer Prsdpfx Aewatvrjirsc Brand Technoinvest Engineering Ltd Model FML-3M Number: 350 Year of construction: 2008 Mesh belt with partitions Belt width: 680 mm Distance between partitions: 200 mm Band height: 40 mm Overall dimensions: 9800 mm x 1500 mm x 2350 mm

Condition: good (used), Full Onion Peeling Line, Comprising of- -Onion Peeler, manufactured by M&P Engineering MP 16584, The Large Onion Peeling Machine from M&P Engineering tops, tails and peels onions of 45mm to 115mm diameter using self adjusting floating knife assemblies over a range of up to 25mm on any one setting. It then slits the onion horizontally from top to tail, the depth of slit is determined by onion quality and grade. The machine finally removes the skin using compressed air providing an end product of optimum appearance -Dolav Tipper -Elevated Conveyor -Roller Table -Onion Washer Predpfx Aszzpu Doirec

Condition: good (used), Year of construction: 1992, machine/vehicle number: 1213255, REF: MM6183 1 x Double D Food Engineering double rack industrial oven, including baking racks and chimney. Features fan assist / air circulation (electric). Supplied with 15 x bakery racks. Podpfx Asxb Alveirerc Located in Northern Ireland and ready to collect. Technical specification ⚙️ ✅ Manufacturer - Double D Food Engineering Ltd ✅ Burner model - n 2-4 ✅ Date of manufacture - 1992 ✅ Rating 500-000 General overview ℹ️ Designed for precision thermal processing, this oven delivers consistent and reliable results for a wide range of applications, including baking, roasting, drying, and cooking. This oven provides superior temperature control and uniform heat distribution, which is critical for product quality and safety. Key Features & Benefits 📋 ✅ Consistent Results: Ensures uniform cooking, baking, or drying for consistent product quality. ✅ High-Volume Capacity: Built to handle large production batches, significantly increasing efficiency and throughput. ✅ Precise Control: Offers accurate temperature and time control, allowing for fine-tuning of the cooking process. ✅ Hygienic Design: Constructed with materials and features that facilitate easy cleaning and meet food safety standards. ✅ Versatile Applications: Suitable for a broad spectrum of food products, from baked goods and snacks to meats and ready meals.

Condition: used, Primus Engineering Type: DST 350 This test setup was designed for performing IP protection tests for “dust” according to, for example, DIN 40050 Part 9 and DIN EN 60529. The test setup is intended for testing technical components under the influence of dust and negative pressure within the limits specified in the technical data. Operation / HMI Control panel with screen and buttons Manual controls Pre-programmed test sequences Integrated vacuum circuit with flow measurement Technical data: Total electrical power: Max. 5 KW Connection voltage: 400V/50HZ 3-N/PE (16A EEC socket) Dimensions: Width approx. 920 mm, Depth approx. 710 mm, Height approx. 1,770 mm Test chamber dimensions: Width approx. 700 mm, Depth approx. 650 mm, Height approx. 770 mm Volume approx. 350 l Weight: approx. 200 kg Vacuum: 0 to -100 mbar Suction air flow: 0 to approx. 5 l/min Podpfezgbtiox Airsrc Operating climate range: Temperature: +12 °C to +30 °C Humidity: 25 % rel. to 75 % rel., non-condensing IP protection tests according to DIN 40050 Part 9 and DIN EN 60529 (VDE 0470 Part 1) Dust test: Dust-protected IP5X and IP5KX Dust-tight IP6X and IP6KX with and without vacuum Condition: used Scope of delivery: (See image) (Changes and errors in the technical data are subject to change!) We will be happy to answer any further questions you may have by telephone.

Condition: excellent (used), Catalog number 7866 TECHNICAL DATA - max. disc diameter 300mm - disc bore diameter 30mm - disc guard - cutting height with installed disc 250mm, 60mm - max. cutting width 600mm - possibility of angled cutting in the vertical plane - arm adjustment or disc adjustment Prsdpfx Aszkg H Noiroc - arm rotation possible: right/left - motor 3kW - table dimensions 1130x1010mm - dust extraction port diameter 50mm - dimensions L/W/H 1150x1190x1510mm - weight 220kg ADVANTAGES - Made in Italy - Unpainted - DTR documentation included - Very good condition - Used saw Net price: 6500 PLN Net price: 1512 EUR, depending on the exchange rate of 4.30 EUR (Prices may vary due to significant exchange rate fluctuations)

Condition: used, Used Vale Engineering Services approximately 12,000 litre working capacity (13,110 litre total capacity) 316L stainless steel vertical reactor / hydrogenation vessel. Unit measures approximately 1,750mm diameter x 5,000mm straight side (tan to tan). Unit has welded dished top and bottom heads. Internal rated 18 bar / full vacuum design pressure at -10 to 180 deg.c. External 304L stainless steel coil jacket rated 11 bar design pressure at -10 to 180 deg.c. Unit has top entry 316L stainless steel 4-tier, 6-blade agitator driven by 15kW, 1465rpm, 50hz electric motor with mechanical seal and reduction gearbox. Unit is mounted on (4) side support lugs. Specifications: Capacity: 12,000 L Type of Stainless: 316 Stainless Steel Internal Pressure: 18 bar Internal Temperature: 180°C Jacket Pressure: 11 bar Predpfx Aiszun D Dorec Jacket Temperature: 180°C Legs/Lugs/Mounting Ring: Lugs

Condition: used, Used BCD Engineering Ltd stainless steel vertical reactor body. Approximately 4,000 litre nominal capacity. Unit measures approximately 1,800mm diameter x 1,700mm straight side. Has welded dished top and bottom heads. Internal rated 10 bar / full vacuum design pressure at -29 to 200 deg.c. External stainless steel coil jacket rated approximately 324 litre capacity, 6 bar / FV design pressure at -29 to 200 deg.C. Unit includes top mounted stainless steel anchor type agitator but no drive/gearbox currently fitted. Unit mounted on side support lugs. Prjdpfxszimv Ie Airoc Specifications: Capacity: 4,000 L Internal Pressure: 10 bar Internal Temperature: 200°C Jacket Pressure: 6 bar Jacket Temperature: 200°C Legs/Lugs/Mounting Ring: Lugs

Condition: new, Year of construction: 2020, SEE photos + PDF layout ATTACHED 1 NEW CSP Aut. complete parquet shrink foil packing line (year 2020) never in use. Podpfxjypb U Te Airerc TOTAL LINE consisting of: roller track + industrial parquet scanner + strapping machine + shrink foil packing line AVM 700 + roller conveyor + heating unit + aut. labelling + collect accumulator with double lenght cross conveyor. (see pdf layout)

Condition: new, Year of construction: 2026, functionality: fully functional, A multi-head weigher is a highly precise weighing system that weighs products on multiple load cells simultaneously. The ideal combination is calculated automatically, ensuring that the target weight is achieved with minimal deviation. Multi-head weighers are particularly suitable for bulk products. When combined with a vertical packaging machine, they provide a continuous, automated packaging process. Multi-head weighers reduce product loss through exact weight combinations and enable higher throughput rates, especially for expensive or sensitive products. In the picture, the 10-head precision weigher exemplifies the upgrade of product-contacting parts to stainless steel 316 and other upgrades. Features: - Available with 10-36 heads - Automatic frequency control of vibration for uniform and precise product distribution - Automatic zeroing during operation ensures better accuracy - Self-diagnosis alarm in a pop-up window for easy troubleshooting - For higher weights, a choice between single and multiple discharge is available - Software-controlled side discharge for non-conforming weights, thus avoiding film and product waste - Live display of individual amplitudes for precise monitoring and control of each vibrator - Live display of individual weight measurements - Central load cell input control replaces the photoelectric sensor - Forced discharge for frozen products prevents melting due to non-selection - Load cells from HBM - Memory space for programs based on parameter settings - As an option, the weigher is available as a waterproof system Technical data: - Max. speed: 60 weighments per minute (wpm) Prjdpfx Aijw Ekh Njrsc - Weight: 430 kg - Weighing range: 10-5000 g - Accuracy: +/- 1.0-1.5 g - Hopper capacity: 1.3L, 2.5L, 4L & 5L - Control panel: 7" touchscreen - Drive system: Stepper motor - Level control: Load cell - Surface: Stainless steel, surface-treated, Teflon (modifications possible on request) - Material: Stainless steel 304 - Connection: 220V / 50Hz