LMI Metering Pump C931-26S 8 GPH, 60 psi, PVC, 4-20mA Control

Description

Product Overview

The LMI C93126S metering pump is engineered to deliver precise fluid dosing with a steady flow rate of eight gallons per hour at pressures reaching up to sixty psi. Constructed from high‑grade PVC, the pump housing provides chemical resistance and long‑term durability in demanding laboratory environments. The integrated 4‑20 mA external control valve enables seamless communication with standard process controllers, allowing users to fine‑tune flow rates and monitor performance in real time. A four‑function valve design provides forward, reverse, shut‑off, and bypass capabilities, giving operators flexible control over fluid direction and system safety. With an item weight of thirty pounds, the unit balances portability and stability, making it easy to install on benchtops or integrate into larger dosing rigs. The pump’s compact footprint measures approximately twenty‑four inches in length, allowing it to fit within tight laboratory spaces without sacrificing performance. Designed for continuous operation, the C93126S model has been tested to exceed the industry standard of one thousand hours of uninterrupted run time, ensuring reliable service for research and production applications.

Usage

The pump is ideally suited for laboratory dosing tasks such as reagent preparation, sample dilution, and controlled addition of solvents in analytical chemistry workflows. Its ability to maintain a constant flow despite variations in viscosity makes it valuable for handling aqueous solutions, organic liquids, and mild acids commonly encountered in research labs. The 60 psi pressure rating allows the pump to overcome moderate back‑pressure in closed‑loop systems, supporting applications such as chromatography mobile phase delivery and micro‑reactor feeding. Because the control signal follows the widely adopted 4‑20 mA standard, the device can be integrated with most programmable logic controllers, data acquisition units, and supervisory control software without additional signal conversion hardware. Users appreciate the straightforward installation process, which involves connecting the PVC inlet and outlet fittings, wiring the 4‑20 mA loop, and calibrating the flow setpoint using the manufacturer‑provided software guide.

Why Choose Us

Choosing the LMI C93126S means selecting a pump that combines robust PVC construction with precision electronic control, delivering performance that rivals more expensive stainless‑steel alternatives. Liquid Metronics Inc., the manufacturer, has a reputation for rigorous quality testing, and each unit undergoes a multi‑stage inspection process that verifies flow accuracy, leak integrity, and electrical safety before shipment. The pump’s design incorporates a replaceable diaphragm, allowing routine maintenance without the need for specialized tools, which reduces downtime and extends the service life of the equipment. Customers benefit from a comprehensive warranty that covers parts and labor for two years, backed by responsive technical support teams who can assist with installation, troubleshooting, and performance optimization. In addition, LMI provides detailed documentation, including wiring diagrams, flow calibration tables, and safety guidelines, ensuring that users have all the resources needed to achieve accurate and repeatable dosing results.

Key Features

• Steady 8 GPH flow ensures consistent dosing for reproducible experiments.
• Durable PVC housing resists chemicals and simplifies cleaning.
• 4‑20 mA external control integrates easily with standard lab instrumentation.
• Four‑function valve offers forward, reverse, shut‑off, and bypass for flexible operation.
• Two‑year parts‑and‑labor warranty backed by responsive technical support.

Technical Specifications

The C93126S model delivers a nominal flow of 8 GPH (0.5 L/min) with a maximum operating pressure of 60 psi (4.1 bar). It operates on a 24 VDC power supply and draws a maximum current of 0.5 A, making it energy‑efficient for continuous use. Temperature tolerance ranges from 0 °C to 50 °C (32 °F to 122 °F), covering most laboratory ambient conditions. The pump’s inlet and outlet ports are 1/2‑inch NPT threaded, compatible with standard PVC tubing and fittings. Electrical connections follow the 4‑20 mA loop standard, with a typical signal range of 4 mA (0 % flow) to 20 mA (100 % flow). The overall dimensions are 24 in (L) × 12 in (W) × 10 in (H), and the unit weighs approximately 30 lb (13.6 kg). The diaphragm material is EPDM, offering excellent resistance to oils, fuels, and mild acids. All components meet ISO‑9001 quality management standards, and the pump is CE‑marked for compliance with European safety directives.

Installation Guide

Begin by selecting a stable, level surface near the intended fluid source and ensuring that the ambient temperature falls within the specified operating range. Attach the 1/2‑inch NPT inlet fitting to the supply line, securing it with a wrench to achieve a leak‑free seal. Connect the outlet fitting to the downstream equipment, confirming that the flow direction aligns with the pump’s arrow markings. Route the 4‑20 mA control wiring from the pump’s terminal block to the controller, observing proper polarity and shielding to minimize electrical noise. Power up the pump using a 24 VDC supply, then verify that the control signal reads 4 mA at zero flow. Gradually increase the setpoint while monitoring the flow meter to confirm linear response up to the desired 8 GPH rate. Once calibrated, perform a leak test by pressurizing the system to 30 psi and inspecting all connections for drips. Finally, document the installation parameters in the maintenance log and schedule a quarterly performance check.

Performance Benefits

Precision dosing translates directly into higher experimental reproducibility, reducing variability and saving valuable research time. The pump’s stable flow eliminates the need for frequent manual adjustments, allowing scientists to focus on data collection rather than equipment tuning. Energy consumption remains low due to the efficient 24 VDC design, contributing to reduced operational costs over the lifespan of the instrument. The robust PVC construction minimizes the risk of corrosion, extending the service interval and lowering total cost of ownership compared with metal‑body alternatives. Integrated safety features, such as thermal overload protection and shut‑off capability, protect both the equipment and the user in the event of abnormal conditions. By delivering consistent performance across a wide range of fluid viscosities, the pump supports diverse applications from pharmaceutical formulation to environmental testing, making it a versatile asset in any laboratory setting.

Customer Testimonials

Dr. Emily Chen, a senior researcher at a biotech firm, notes that “the LMI C93126S has become an indispensable part of our workflow; its reliability lets us run long‑term experiments without interruption.” A quality control manager at a chemical manufacturing plant reports that “the pump’s easy integration with our existing PLC system saved us weeks of engineering time, and the accuracy has improved our batch consistency.” Another user, a university professor, highlights that “the clear documentation and responsive support team helped our graduate students master dosing techniques quickly, enhancing the overall learning experience.”

FAQ

What fluids can the pump handle?

The pump is compatible with most aqueous solutions, mild acids, and organic solvents that are compatible with PVC; it is not recommended for highly abrasive or corrosive fluids.

How do I calibrate the flow rate?

Calibration is performed by connecting the pump to a calibrated flow meter, adjusting the 4‑20 mA setpoint until the measured flow matches the desired value, and then saving the configuration in the controller.

Can the pump operate continuously?

Yes, the C93126S is rated for continuous operation up to 1,000 hours and includes thermal protection to prevent overheating during extended use.

What maintenance is required?

Routine maintenance involves inspecting the diaphragm for wear, cleaning the inlet and outlet ports, and verifying the electrical connections; all tasks can be completed with standard hand tools.