Technical Specifications

Reference Model	7121-3
Product Type	Miniature diaphragm air/liquid pump
Flow Rate	300 mL/min at atmospheric pressure
Pump Body Material	PP
Diaphragm Material	EPDM, FKM
Port Size	4 mm ID silicone tubing
Pressure Range	Output ≥ 200 kPa; suction ≤ -80 kPa in liquid state (specific parameters under different conditions, please refer to Keyto specification）
Rated Power	7 W
Rated Voltage	12 V DC or 24 V DC optional
Medium	Water, weak acid and weak base solutions, etc.
Life Span	Up to 10,000 hours with BLDC motor; PWM optional
Safety Current	N/A, 1.2A
Rate Current	12V:≤0.36A, 24V:≤0.16A or 12V:≤0.5A, 24V:≤0.25A

Miniature Diaphragm Pump · 7121 Series

7121-3 Miniature Diaphragm Pump for Compact Liquid Handling Systems

The Keyto 7121-3 is a compact miniature diaphragm air/liquid pump designed for stable suction, transfer, cleaning, waste discharge, mixing, and vacuum generation in automated instruments.

With 300 mL/min flow rate, 12 V/24 V options, PP pump body, EPDM/FKM diaphragm choices, and up to 10,000-hour BLDC service life, it supports reliable integration in medical, laboratory, environmental, and analytical equipment.

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Why Choose the 7121-3 Miniature Diaphragm Pump?

This model is built for equipment designers who need compact size, stable liquid transfer, material compatibility, and long service life in OEM fluidic systems.

Compact Liquid Transfer

300 mL/min flow rate supports liquid suction, cleaning, waste discharge, and transfer in space-limited instruments.

Long BLDC Service Life

Brushless motor configuration supports up to 10,000 hours of operation, helping reduce maintenance frequency.

Material Options

PP pump body with EPDM or FKM diaphragm options helps support different fluids such as water and weak acid/base solutions.

Pressure and Suction Capability

Output pressure ≥ 200 kPa and liquid-state suction ≤ -80 kPa support stable pumping across different system conditions.

12 V / 24 V Integration

Optional 12 V and 24 V DC configurations make the pump easier to integrate into different control architectures.

Low Noise and Low Vibration

The 7121 series is designed for applications where stable operation, low noise, and reduced vibration are important.

Typical Applications

Medical device fluid control
Laboratory automation systems
Analytical instruments
Environmental monitoring equipment
Cleaning, rinsing, and waste liquid discharge modules
Compact OEM liquid handling systems

Material and Medium Compatibility

PP pump body for compact fluidic pump structures
EPDM and FKM diaphragm options for different fluid requirements
Suitable for water, weak acid, and weak base solutions
4 mm ID silicone tubing connection for system integration
For special fluids, confirm compatibility with Keyto engineering support before final selection

Model Selection Notes

Choose the 7121-3 when your system requires a compact miniature diaphragm pump with moderate flow, stable suction, and long-life brushless motor performance. If your project requires higher flow, dual-head structure, brush motor configuration, or higher pressure resistance, compare it with other Keyto miniature diaphragm pump models.

miniature diaphragm pumps 7121-6 micro diaphragm pump 7521-3 high pressure diaphragm pump 7101 miniature air pump

Frequently Asked Questions

What is the Keyto 7121-3 miniature diaphragm pump used for?

The 7121-3 is used for compact liquid transfer, suction, cleaning, waste discharge, mixing, and vacuum generation in automated medical, laboratory, environmental, and analytical instruments.

What is the flow rate of the 7121-3 pump?

The flow rate is 300 mL/min at atmospheric pressure. Actual performance may vary depending on tubing, medium, pressure conditions, and system design.

What voltage options are available?

The 7121-3 supports 12 V DC and 24 V DC options, making it suitable for different OEM equipment control systems.

Which wetted materials are available?

The standard pump body material is PP, and diaphragm options include EPDM and FKM. Fluid compatibility should be confirmed based on the actual medium.

Is the 7121-3 suitable for long-life applications?

Yes. The brushless motor version supports up to 10,000 hours of service life, which helps reduce maintenance needs in long-running equipment.

Need help selecting a miniature diaphragm pump?

Share your flow rate, pressure, medium, voltage, tubing, and installation requirements. Keyto can help evaluate a suitable pump configuration for your system.

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