Geocontrol PRO Pneumatic Bladder Pump System with Integrated Controller

Overview

The Geocontrol PRO Pneumatic Bladder Pump System is an engineered solution for low-disturbance groundwater sampling—specifically designed to preserve volatile organic compound (VOC) integrity during collection. Operating on the principle of compressed-air-driven positive displacement, the system utilizes a flexible elastomeric bladder housed within a stainless-steel pump body. When pressurized air is introduced into the annular chamber surrounding the bladder, the bladder contracts, expelling water upward through the sample discharge line. Upon pressure release, the bladder re-expands passively via hydrostatic head, drawing groundwater in through the intake port located at the bottom of the pump. This cyclic, non-mechanical actuation eliminates impeller shear, motor-induced turbulence, and thermal artifacts—critical for VOC-sensitive applications governed by EPA Method 502.2, ASTM D6719, and ISO 5667-10.

Key Features

• Integrated controller with built-in oil-free diaphragm air compressor—rated for static water levels up to 60 m (197 ft), eliminating dependency on external air sources
• True low-flow sampling capability: flow rate precisely regulated via adjustable needle valve, enabling sustained rates from 10 mL/min to 500 mL/min with high reproducibility
• Ultra-portable controller unit: total mass < 4 kg (8.8 lbs), compatible with 12 V DC (automotive battery or Li-ion pack), 220 V AC mains, or portable rechargeable power stations
• Modular depth extension: optional drop-tube assembly enables effective sampling from depths exceeding 300 m—maintaining full submergence while minimizing drawdown-induced aquifer disturbance
• Optional drawdown sensor integration: real-time water-level monitoring with automatic pump shutdown when pre-set drawdown thresholds are exceeded—ensuring compliance with low-flow purging protocols per USGS TWRI 3-A17 and EPA Guidance for Low-Flow Groundwater Sampling

Sample Compatibility & Compliance

The Geocontrol PRO is validated for use with VOCs (e.g., benzene, chloroform, tetrachloroethylene), SVOCs, metals, nutrients, and isotopic tracers. Its stainless-steel wetted components (316 SS pump body, FKM-sealed bladder) meet NSF/ANSI Standard 61 requirements for potable water contact. The system supports field-deployable filtration (0.45 µm inline cartridge filters) and flow-through cell integration for real-time conductivity/pH/DO measurements. All operational logs—including cycle count, total runtime, pressure events, and (if equipped) drawdown history—are timestamped and stored locally, supporting GLP-compliant data traceability. Software export formats include CSV and XML, facilitating alignment with LIMS and regulatory reporting frameworks under 40 CFR Part 136 and ISO/IEC 17025-accredited laboratories.

Software & Data Management

The controller features an embedded microprocessor with non-volatile memory for event logging and configuration retention. No proprietary software is required for basic operation; however, optional USB-C data download enables post-hoc analysis of pump cycles, pressure profiles, and duration-weighted average flow rates. Firmware updates are performed via standard DFU mode. Audit trails comply with ALCOA+ principles (Attributable, Legible, Contemporaneous, Original, Accurate, Complete, Consistent, Enduring, Available), satisfying documentation expectations for environmental site assessments under CERCLA and RCRA corrective action programs.

Applications

• Regulatory VOC monitoring at UST sites, landfills, and brownfields per EPA Region 3 and Region 9 protocols
• Long-term trend monitoring in multi-level monitoring wells where cross-well contamination must be avoided
• Low-flow well purging prior to chemical or isotopic analysis (e.g., δ¹⁸O, ³H, SF₆)
• Time-series sampling for plume migration studies requiring minimal aquifer perturbation
• Field deployment in remote or off-grid locations using solar-charged lithium battery systems

FAQ

What is the maximum recommended sampling depth without the drop-tube extension?
Static water level up to 60 meters is supported using the integrated air compressor; deeper installations require the optional drop-tube kit and external air supply.
Can the Geocontrol PRO be used for drinking water compliance sampling?
Yes—when configured with NSF-certified wetted materials and operated per EPA Method 502.2, it meets requirements for VOC analysis in public water systems.
Is the controller compatible with dataloggers or SCADA systems?
Analog 4–20 mA output and Modbus RTU (RS-485) interface are available as factory-installed options for integration into telemetry networks.
How is calibration verified for low-flow accuracy?
Calibration is performed gravimetrically using NIST-traceable balances and certified volumetric flasks; flow rate stability is confirmed over ≥30-minute continuous operation at setpoint.
Does the system support automated unattended operation?
Yes—programmable duty cycles (on/off intervals), total volume targets, and auto-shutdown after completion are configurable via front-panel menu or USB upload.