Longer GD Series Dispensing Peristaltic Pumps

Overview

The Longer GD Series Dispensing Peristaltic Pumps provide controlled liquid transfer and repeatable dispensing for laboratory research, analytical workflows and engineering applications. The series comprises GD200-1B, GD400-1B and GD650-1B, offering maximum motor speeds of 200, 400 and 650 rpm respectively. Each model combines a 5-inch touchscreen, programmable time- and volume-based dispensing, calibration functions and multiple control interfaces. Compatible pump heads and tubing allow users to configure the fluid path for different liquid-handling requirements.

How the GD Series Works

The GD Series operates using a peristaltic mechanism in which rotating rollers progressively compress flexible tubing. This movement transfers liquid through the tubing without requiring direct contact between the liquid and the pump-drive mechanism.

Unlike basic speed-controlled pumps, the GD Series provides multiple dispensing modes:

• Continuous mode: For ongoing liquid transfer or circulation with speed- or flow-rate-based operation.
• Time mode: For repeated pumping over defined operating periods.
• Volume mode: For dispensing specified liquid volumes in repeated sequences.

Flow-rate and volume calibration help account for differences between nominal settings and actual liquid delivery.

A compatible external flow meter may also be integrated for automatic flow calibration and feedback-based operation. This flow meter is optional and must not be assumed to be included with the pump.

Key Features

• Three drive models: Maximum speeds of 200, 400 and 650 rpm.
• 5-inch colour touchscreen: Displays operating parameters, dispensing information and pump status.
• Programmable dispensing: Continuous, time-based and volume-based operating modes.
• Calibration functions: Flow-rate calibration and volume calibration, with optional automatic flow-meter-assisted calibration.
• Dispensing recipes: Store and recall up to 100 dispensing parameter configurations.
• Repeat dispensing: Programmable dispensing count and interval settings.
• Remote operation: External-control inputs and RS485 communication supporting Modbus RTU or Longer OEM protocols.
• Voice-control capability: Supported operating commands include start, stop, pause, direction and full-speed operation.
• User and operational records: Three-level access management with exportable operating logs.
• Interchangeable fluid path: Multiple compatible pump heads and tubing configurations for different flow requirements.
  
  

Model Comparison

Specification	GD200-1B	GD400-1B	GD650-1B
Motor-speed range	0.01–200 rpm	0.01–400 rpm	0.01–650 rpm
Maximum reference flow, single channel	1,000 mL/min	2,000 mL/min	3,250 mL/min
Power consumption	30 W	50 W	70 W

Maximum reference flow rates apply to the specified compatible YZ25-13X (YZII25) pump head and tubing configurations. They are not universal flow rates for every pump-head arrangement.

Technical Specifications

Parameter	Specification
Product family	Longer GD Series
Models	GD200-1B, GD400-1B, GD650-1B
Pump type	Dispensing peristaltic pump
Operating modes	Continuous, time-based and volume-based
Speed resolution	0.01 rpm below 100 rpm; 0.1 rpm at or above 100 rpm
Motor-speed accuracy	±0.1%
Dispensing volume setting	0.001–9999 with selectable µL, mL or L units
Dispensing count	0–999999; 0 indicates unlimited cycles
Operating/interval time setting	0.1 seconds to 9999 hours
Calibration	Flow-rate and volume calibration
Automatic calibration	Optional, with compatible flow meter
Display	5-inch colour LCD touchscreen
Local controls	Touchscreen and physical keypad
Rotation	Clockwise and counter-clockwise
External speed-control signals	4–20 mA, 0–5 V, 0–10 V or 0–10 kHz
Start/stop and direction control	Compatible 5–24 V logic signals or relay contacts
Communication	RS485, Modbus RTU / Longer OEM protocol
Dispensing parameter recipes	Up to 100
Operating logs	Up to 4,000 entries
Power supply	AC 100–240 V, 50/60 Hz
Dimensions (L × W × H)	305 × 190 × 201 mm
Weight, drive only	Approximately 3.5 kg
Enclosure protection	IP32
Operating temperature	0–40 °C
Relative humidity	Below 80%

Important: The ±0.1% specification refers to motor-speed accuracy, not guaranteed liquid-volume accuracy. The minimum dispensing setpoint is also not a guarantee that every pump-head and tubing configuration can physically deliver that volume.

Compatible Pump Heads and Flow-Rate References

The GD Series can accommodate several manufacturer-specified pump heads. The achievable flow range changes with the selected head and tubing dimensions.

Pump-head configuration	GD200-1B	GD400-1B	GD650-1B
YZ1515X, 3 rollers	730 mL/min	1,460 mL/min	2,350 mL/min
YZ2515X	530 mL/min	1,060 mL/min	1,730 mL/min
YZ25-13X / YZII25	1,000 mL/min	2,000 mL/min	3,250 mL/min
DMD15-13	690 mL/min	1,380 mL/min	2,240 mL/min
FG15-13	800 mL/min	1,600 mL/min	2,600 mL/min
DG15-24	600 mL/min	1,200 mL/min	1,950 mL/min

These are manufacturer-specified single-channel maximum reference flow rates. Actual delivery depends on operating speed, pump-head geometry, tubing properties, liquid characteristics and system resistance.

Pump heads, tubing and optional accessories should be selected for the required configuration and confirmed before ordering.

Selecting the Appropriate GD Model

GD200-1B is suitable for applications where the required pumping capacity can be achieved within a maximum motor speed of 200 rpm.

GD400-1B provides additional drive-speed capacity and greater maximum reference flow with compatible pump heads.

GD650-1B offers the highest maximum speed and reference flow capacity within the three-model family.

The appropriate model should be selected based on required dispensing volumes, flow range, calibration requirements, tubing compatibility and operating conditions—not maximum speed alone.

Typical Applications

The GD Series may be considered for:

• Repetitive laboratory reagent dispensing
• Controlled liquid addition to experimental reactors
• Sample preparation and analytical workflows
• Flow-chemistry experiments and method development
• Compatible electrochemical flow-cell systems
• Automated laboratory fluid transfer and dispensing
• Research systems requiring timed or volume-based pumping

For aggressive electrolytes, solvents or specialised chemicals, verify the compatibility of the tubing and all wetted fluid-path components.

Integration and Configuration

The GD Series can be operated through its touchscreen, physical controls or compatible remote interfaces.

RS485 communication allows integration with appropriately configured laboratory controllers and automation systems. External control may be useful where the pump must operate alongside other research equipment.

Before ordering, confirm the required pump model, pump head, tubing material and dimensions, dispensing volume, flow range, number of channels and any external-control accessories.

For applications requiring a different multichannel drive arrangement, the Longer GD200-1C should be evaluated separately rather than treated as an interchangeable GD-1B model.

Why Source Through ScienceGears?

ScienceGears assists laboratory researchers and engineering customers with selecting dispensing pump configurations, compatible pump heads, tubing and control options.

Our team can help assess application requirements and prepare quotations for suitable equipment. Product availability, supply regions and delivery arrangements are confirmed in accordance with the relevant manufacturer agreements.

Frequently Asked Questions

What is the difference between the GD200-1B, GD400-1B and GD650-1B?

The main difference is their maximum motor speed: 200, 400 and 650 rpm respectively. The maximum reference flow rate also changes with the model and pump-head configuration.

Can the GD Series dispense a specified liquid volume?

Yes. The pumps provide volume-based dispensing and calibration functions. Actual delivery accuracy depends on the pump-head and tubing selection, operating conditions and calibration.

What is the difference between the GF and GD Series?

The GF Series focuses on controlled flow-rate operation and calibration, while the GD Series adds more extensive repeat-dispensing functions, including stored dispensing recipes and programmable dispensing sequences.

Does the GD Series include a flow meter?

A compatible external flow meter may be used for automatic calibration and feedback-based operation. It is an optional component and should not be assumed to be supplied as standard.

Can the pumps be integrated into laboratory automation systems?

Yes. The GD Series supports external-control signals and RS485 communication with Modbus RTU or Longer OEM protocols. Integration must be checked for the intended controller and operating requirements.

Can the GD Series be used with electrochemical electrolytes?

Potentially, where the pump and selected fluid path satisfy the experimental requirements. Chemical compatibility, operating pressure, tubing life and acceptable flow pulsation should be assessed.

What information should I provide when requesting a quotation?

Provide the liquid composition, required dispensing volume, flow range, expected operating duration, tubing requirements, number of channels and any communication or automation needs.

Contact ScienceGears

Contact ScienceGears to discuss the Longer GD Series, including dispensing performance, model selection, compatible pump heads, tubing, calibration and quotation requirements.