CME-25

Summary

Product identification

The Grundfos CME 25 is a horizontal, multistage centrifugal pump designed for 50/60 Hz operation. CME pumps are based on the CM pump range, with the key difference being the motor. CME pumps feature a Grundfos MGE motor, which incorporates a frequency converter for continuously variable speed control. This allows the pump to operate at any duty point, adapting performance to specific requirements.

Key features of CME pumps include:

• Controlled operation for fluctuating consumption
• Constant pressure maintenance
• Communication capabilities with the pump

Product variants are available in different material versions:

• CME 25-A: Cast iron (EN-GJL-200) version
• CME 25-I: Stainless steel (EN 1.4301/AISI 304) version
• CME 25-G: Stainless steel (EN 1.4401/AISI 316) version

Operating limits

The CME 25 pump is designed for variable flow applications, utilizing frequency-controlled speed to achieve optimum operating economy.

• 100 % speed: Approximately 3400 min⁻¹ (irrespective of input frequency).
• Performance range (50/60 Hz):
  • Flow rates (Q) up to approximately 34 m³/h or 9 l/s.
  • Head (H) up to approximately 65 m or 600 kPa.
  • Motor output power (P₂) up to approximately 6 kW.
  • NPSH values up to approximately 15 m.
  • Efficiency (Eta) up to approximately 60%.

See the official PDF for detailed performance curves (H-Q, P₂-Q, NPSH-Q, Eta-Q) for exact values across the operating range.

Electrical

The CME pump motor is a Grundfos MGE motor designed to EN standards, incorporating a frequency converter. This enables continuously variable control of the motor speed. A pressure sensor can be connected to the built-in frequency converter.

Supply Voltage:

• 3 x 380-480 V, 50/60 Hz (supply voltage L)
• 3 x 460-480 V, 60 Hz (supply voltage N)

Motor Output Power (P₂):

• CME 25-1:
  • 3.0 kW (3 x 380-480 V, 50/60 Hz)
  • 4.0 kW (3 x 460-480 V, 60 Hz)
• CME 25-2:
  • 7.5 kW (3 x 380-480 V, 50/60 Hz)
  • 5.5 kW (3 x 460-480 V, 60 Hz)

Mechanical / Hydraulic

The CME 25 is a horizontal, multistage centrifugal pump.

Materials of Construction: The pump materials are identical to those of the CM pump range. Key components and their materials include:

• Shaft seal, steel parts: Stainless steel (EN 1.4301/AISI 304 or EN 1.4401/AISI 316)
• Shaft seal, seal faces: Al₂O₃/carbon or SiC
• Pump shaft: Stainless steel (EN 1.4057/AISI 431, EN 1.4301/AISI 304, or EN 1.4401/AISI 316)
• O-rings: EPDM, FKM or FFKM
• Discharge part (CME-A): Cast iron (EN-GJL-200)
• Inlet part (CME-A): Cast iron (EN-GJL-200)
• Chamber: Stainless steel (EN 1.4301/AISI 304 or EN 1.4401/AISI 316)
• Plug: Stainless steel (EN 1.4404/AISI 316L)
• Impeller: Stainless steel (EN 1.4301/AISI 304 or EN 1.4401/AISI 316)
• Spacing pipe: Stainless steel (EN 1.4401/AISI 316)
• Clamp: Stainless steel (STX2000)
• Flange (CME-I/G): Cast iron
• Sleeve: Stainless steel (EN 1.4301/AISI 304 or EN 1.4401/AISI 316)
• Nut: Stainless steel A4
• Washer (NORD-LOCK®): Steel (EN 1.4547)

See the official PDF for a complete material specification table, including DIN W.-Nr. and ISO/AISI/ASTM equivalents for all components.

Dimensions: The pump dimensions vary by model and supply voltage.

• Connections: A1 and A2 are Rp 2 or NPT 2. A3 is Rp 3/8. A4 is 12.
• All other dimensions (B1, B2, B3, H, H1, H2, L1, L2, L3, L4, L5, L6, L7, L8, L9) are provided in millimeters.

See the official PDF for exact tabulated dimensional values for CME 25-A, CME 25-I, and CME 25-G models across different supply voltages.

Weights and Shipping Volume:

• CME 25-A, CME 25-I, CME 25-G (3 x 380-480 V, 50/60 Hz):
  • CME 25-1: 39.5 kg (net), 43.0 kg (gross), 0.0847 m³ (shipping volume)
  • CME 25-2: 61.8 kg (net), 65.3 kg (gross), 0.0847 m³ (shipping volume)
• CME 25-A, CME 25-I, CME 25-G (3 x 460-480 V, 60 Hz):
  • CME 25-1: 54.1 kg (net), 57.6 kg (gross), 0.0847 m³ (shipping volume)
  • CME 25-2: 58.0 kg (net), 61.5 kg (gross), 0.0847 m³ (shipping volume)

Control and Monitoring

Communication with CME pumps is possible via:

• A central building management system, allowing remote monitoring and adjustment of control modes and setpoint settings.
• A Grundfos R100 remote control (accessory), which enables monitoring and changing control modes and settings via an IR signal.
• A control panel on the CME pump terminal box for manual setpoint adjustments.

Communication can take place over various networks using Grundfos CIU units:

• CIU 100: LON
• CIU 150: PROFIBUS DP
• CIU 200: Modbus RTU
• CIU 250: GSM
• CIU 270: GRM
• CIU 300: BACnet MS/TP

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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)

Lenntech datasheet mirror