ChemTron GXLa Series Electromagnetic Diaphragm Metering Pumps

Overview

The ChemTron GXLa Series electromagnetic diaphragm metering pumps are precision-engineered laboratory and pilot-scale dosing systems designed for accurate, pulseless, and maintenance-minimized liquid delivery under variable process conditions. Operating on electromagnetic actuation—where a solenoid-driven armature directly displaces a PTFE-reinforced elastomeric diaphragm—the GXLa pumps eliminate mechanical linkages, gearboxes, and lubricated components typically found in motor-driven or cam-based metering pumps. This architecture ensures high repeatability (±1% typical volumetric accuracy over full stroke range), zero leakage risk, and immunity to backpressure fluctuations up to 10 bar. The series is optimized for continuous or intermittent dosing of aggressive, viscous, or shear-sensitive fluids—including acids, alkalis, solvents, catalysts, and biological reagents—in analytical chemistry, water treatment R&D, pharmaceutical formulation, and microreactor feed control applications.

Key Features

• Electromagnetic drive mechanism: Contactless, wear-free actuation with no rotating parts or lubrication requirements; enables stable operation across ambient temperatures from 5 °C to 40 °C.
• Self-venting metering head: Integrated air-release valve eliminates manual priming and prevents gas lock during startup or low-flow operation—critical for consistent dosing of degassed or volatile media.
• Bypass-free design: All models feature a single-path fluidic path with check valves rated for >1 million cycles, minimizing dead volume and ensuring quantitative transfer without recirculation losses.
• Modular port configuration: Standardized G¼” BSP threaded connections; nominal inlet/outlet diameters support laminar flow profiles and reduce turbulence-induced pulsation (measured <3% peak-to-peak at 100% stroke frequency).
• Digital communication interface: RS-485 Modbus RTU protocol standard; optional analog 4–20 mA or 0–10 V input for external flow rate modulation; compatible with SCADA, PLC, and LIMS integration for audit-trail-compliant operation.
• IP65-rated enclosure: Sealed front panel with membrane keypad and LED status indicators; suitable for installation in controlled laboratory environments or ventilated technical cabinets.

Sample Compatibility & Compliance

The GXLa Series is constructed with wetted materials compliant with ISO 15001 and USP Class VI standards: PTFE-coated diaphragms, EPDM or Viton® valve seats (model-dependent), and 316 stainless steel pump heads. It supports aqueous solutions, organic solvents (e.g., methanol, THF, acetone), dilute mineral acids (HCl ≤10%, H₂SO₄ ≤5%), and alkaline media (NaOH ≤5%) without degradation over extended service intervals. The design adheres to EN 61000-6-2 (immunity) and EN 61000-6-4 (emission) for electromagnetic compatibility. While not certified for hazardous area use (ATEX/IECEx), the pumps meet CE marking requirements for machinery safety (2006/42/EC) and RoHS 2011/65/EU directives. For GLP/GMP workflows, firmware supports time-stamped event logging (start/stop, fault, parameter change) traceable to internal real-time clock.

Software & Data Management

ChemTron provides the GXLab Control Suite—a Windows-based configuration and monitoring application enabling remote setup of stroke frequency, stroke length (0–100%), and run mode (continuous, timed batch, or external trigger). The software records time-synchronized flow data at user-defined intervals (1 s to 10 min resolution), exports CSV-formatted datasets with metadata (date, model ID, firmware version), and generates calibration reports per ISO/IEC 17025 guidelines. Audit trail functionality complies with FDA 21 CFR Part 11 requirements when deployed with Windows domain authentication and electronic signature modules. Firmware updates are delivered via signed .hex files verified using SHA-256 checksums to ensure integrity and traceability.

Applications

• Automated reagent addition in titration and colorimetric analyzers
• Precise co-feed control in continuous-flow synthesis platforms
• Calibration standard delivery for ICP-OES and HPLC autosamplers
• pH and ORP adjustment loops in bioreactor and fermentation studies
• Low-volume dosing of enzyme inhibitors or cytotoxic compounds in assay development
• Trace nutrient injection in algal cultivation and wastewater nitrification trials

FAQ

What is the minimum controllable flow rate for the GXLa 1020 model?

The GXLa 1020 achieves stable dosing down to 0.15 L/h (1% of max flow) using micro-step frequency modulation and fixed-stroke operation—verified per ISO 5167 Annex E test protocols.
Can the pump handle slurries or particulate-laden fluids?

No. The GXLa Series is intended for clean, low-viscosity liquids (≤500 mPa·s). Suspended solids >50 µm may impair valve seating and accelerate diaphragm fatigue; inline filtration (≤25 µm) is mandatory for borderline media.
Is external pressure regulation required upstream or downstream?

Not for standard operation. The pump’s inherent pressure compensation maintains set flow rate within ±2% across 0–10 bar backpressure; however, a pressure relief valve is recommended downstream if system blockage risk exists.
How often does the diaphragm require replacement under continuous duty?

Based on accelerated life testing at 200 strokes/min and 10 bar, PTFE-diaphragm service life exceeds 15,000 operating hours (≈1.7 years at 24/7 use); replacement kits include diaphragm, valves, and gaskets with serialized traceability.
Does ChemTron provide calibration certificates with NIST-traceable documentation?

Yes. Factory calibration is performed using gravimetric reference standards traceable to PTB (Physikalisch-Technische Bundesanstalt); optional UKAS-accredited certificates available upon request.