Amarex N

Summary

Product identification

The KSB Amarex N is a fully floodable, non-self-priming, close-coupled submersible motor pump designed for waste water applications. It operates at 50 Hz and is available in nominal diameters from DN 50 to DN 100.

Key design features include:

• Drive: Three-phase asynchronous squirrel-cage motor.
• Shaft seal: Two bi-directional mechanical seals in tandem arrangement, with a liquid reservoir.
• Bearings: Grease-lubricated, sealed for life, and maintenance-free. Reinforced bearings are optionally available for S impeller models.
• Impeller types:
  • F (Free-flow impeller): Suitable for fluids containing solid substances, stringy material, entrapped air or gas, activated sludge, digested sludge, heating sludge, mixed water, raw waste water, raw sludge, and recirculated sludge. Free passage ranges from 40 mm to 100 mm depending on the model.
  • S (Cutter): Designed for faeces, domestic sewage, and waste water containing long fibres. Offers a free passage of 6 mm.
  • D (Open, diagonal single-vane impeller): For fluids containing solid substances and long fibres, activated sludge, digested sludge, heating sludge, mixed water, raw waste water, raw sludge, and recirculated sludge. Free passage ranges from 65 mm to 76 mm depending on the model.
• Coating: Standard environmentally-friendly KSB top coat (two-component epoxy paint), colour RAL 5002, film thickness = 80 µm. An optional 300 µm coating is available.

Operating limits

• Flow rate (Q): ≤ 190 m³/h (≤ 53 l/s)
• Head (H): ≤ 49 m
• Fluid temperature (T):
  • Motor version YL: ≤ 40 °C
  • Motor version UL: ≤ 55 °C (can operate for short periods, 3 to 5 minutes or until temperature guards trip, at up to 80 °C)
  • Motor version WL: ≤ 60 °C (can operate for short periods, 3 to 5 minutes or until temperature guards trip, at up to 80 °C)
• Mode of operation: S1 (submerged, max. 25 m) or S3 (outside the fluid).
• Maximum switching frequency: 30 starts per hour (for DOL starting method).
• Installation depths:
  • Stationary, with guide hoop: 1.5 m / 1.8 m / 2.1 m
  • Stationary, with single guide rail: 4.5 m (standard), 6.0 m (standard variants)
  • Stationary, with twin guide rail: 4.5 m (standard), 6.0 m (standard variants)
  • Stationary, with guide wire: 4.5 m (standard), 9.5 m (standard variants)
  • Transportable: 4.5 m

Feed water

The Amarex N pump is suitable for a wide range of waste water applications, including:

• Waste water management
• Drainage systems
• Sewage treatment plants
• Sludge disposal
• Drainage of rooms and areas at risk of flooding on municipal, commercial and industrial premises

Fluids handled:

• Service water, Grey water
• Waste water with faeces
• Waste water containing long fibres and solid substances
• Fluids containing gas (up to 8% for F impeller)
• Activated sludge, Digested sludge, Raw sludge (pumpable up to a dry substance content of 13% for D impeller, 8% for F impeller)
• Contaminated surface water, River water, Mixed water
• Industrial waste water containing paint suspensions (solvent-free), lacquer/paint/varnish suspensions (solvent-free), fibres/pulp, chips/swarf, or abrasive substances.
• Mildly acidic industrial waste water (pH value ≥ 6.5).
• Non-corrosive waste water, including ammonium water, ammonium hydroxide 5% NH₄OH, urea 25% (NH₂)₂-CO, potassium hydroxide 10% KOH, calcium hydroxide 5% Ca(OH)₂, sodium hydroxide 5% NaOH, sodium carbonate 30% Na₂CO₃.
• Non-corrosive waste water containing aliphatic hydrocarbons (e.g., oils, petrol, butane, methane), aromatic hydrocarbons (e.g., benzene, styrene), or chlorinated hydrocarbons (e.g., tetrachloroethylene, ethylene chloride, chloroform, methylene chloride).
• Highly abrasive industrial waste water (chemically neutral), such as lime water (for sinter contents < 5 g/l), lime milk containing quartz and pigment suspension (up to 15% lime milk), and water/sand mixture (up to 5 g/l solids content).

Recommended materials for specific fluids:

• EN-GJL-250 (grey cast iron): For most waste water types, grey water, river water, contaminated surface water, mixed water, sludges, and non-corrosive industrial waste water.
• Norihard 0.9635 (white cast iron): For highly abrasive waste water causing wear (solids contents < 5 g/l), chips/swarf, abrasive substances, lime water, lime milk, and water/sand mixtures.
• Noridur 1.4593 (duplex stainless steel): For corrosive waste water.

Electrical

• Motor rating (P2): 0.8 - 4.2 kW
• Power input (P1): 1.29 - 5.40 kW
• Nominal current (IN): 2.90 - 9.30 A
• Starting current (IA): 17.4 - 50 A
• Voltage: Standard 400 V. Optional voltages include 230 V, 415 V, 500 V, 690 V.
• Explosion protection:
  • Motor version YL is supplied in Ex d IIB T4 Gb type of protection and is required in countries stipulating explosion-proof units for handling sewage with faeces.
  • Motor versions UL and WL are non-explosionproof.
• Power cable: Standard 10 m rubber-sheathed cable (H07RN8-F 7G1.5²). Optional lengths of 15 m, 20 m, 30 m, 40 m, 50 m are available. Other cable types include 8-core rubber-sheathed cable (H07RN8-F 8x1.5²) for pumps with leakage sensors, TEHSITE power cable (8G1.5), and shielded rubber-sheathed cable (S07RC4N8-F-8G1.5) for frequency inverter operation.
• Monitoring equipment:
  • Winding temperature (YL version): Includes a temperature monitoring circuit (bimetal switch with automatic reset and start-up) and a limiting circuit (bimetal switch via a tripping unit with manual reset).
  • Winding temperature (UL, WL versions): Includes a temperature monitoring circuit (bimetal switch with automatic reset and start-up).
  • Optional: Leakage sensor in the motor space (requires an 8-core connection cable).

Mechanical / hydraulic

• Nominal diameter: DN 50 - DN 100.
• Materials (Standard variant G):
  • Casing: EN-GJL-250
  • Intermediate casing: EN-GJL-250
  • Impeller: EN-GJL-250
  • Cutter (S impeller): 1.2080.02 (K100)
  • Shaft: 1.4021
  • Mechanical seal (Drive end): Carbon/Al₂O₃
  • Mechanical seal (Pump end): SiC/SiC
  • Screws/bolts: A2
  • Elastomers: NBR
• Optional material variants:
  • G1: Impeller made of Noridur 1.4593 (duplex stainless steel).
  • G2: Impeller made of Norihard 0.9635 (white cast iron).
  • GH: Intermediate casing and impeller made of Norihard 0.9635 (white cast iron).
  • Optional shaft material: 1.4462 + C45 N.
  • Optional elastomers: FPM (Viton) O-rings and flange gaskets.
  • Optional mechanical seal: Special mechanical seal (HJ977) with covered spring, featuring SiC/SiC seal faces, Viton sealing elements, and stainless steel spring/metal parts.
• Discharge line connections:
  • Flanged connection (DN 50/DN 65).
  • Threaded connection in the flange (DN 50 - G 2″, DN 65 - G 2 1/2″).
  • Clamped connection (DN 50/DN 65) for standard pipes (e.g., steel with 60.3 mm OD or PVC with 63 mm OD for DN 50; steel with 76.1 mm OD or PVC with 75 mm OD for DN 65).
• Pump flange: DN 50 and 65 are ISO 7005 PN 16 / DIN 2501 PN 16. DN 80 and 100 are ISO 7005 PN16 / DIN 2501 PN16. An optional suction flange drilled to ASME 150 lb is available.
• Dimensions and characteristic curves: Exact tabulated values for pump dimensions, connection elbows, and detailed characteristic curves (n = 2900 rpm and n = 1450 rpm) are available in the official PDF.

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Disclaimer: This summary is based on extracted text and may not include all figures, footnotes, or the latest revisions from the complete OEM PDF datasheet. Contractual data must always match the specific OEM PDF revision used on the project.

Official datasheet (PDF)

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