Global Water WA100 Submersible Level Float Switch

Overview

The Global Water WA100 is a submersible, gravity-actuated level float switch engineered for robust and repeatable point-level detection in liquid containment systems. Unlike ultrasonic or capacitive alternatives, the WA100 operates on mechanical displacement: a buoyant nitrile rubber (NBR) float rises or falls with liquid level, actuating an internal microswitch housed within a brass sensing head. Its design follows proven hydrostatic principles—leveraging specific gravity differentials and calibrated buoyancy—to deliver deterministic ON/OFF signaling without reliance on electronics, power supply stability, or signal conditioning. This makes it particularly suitable for environments where electromagnetic interference, condensation, coating buildup, or low-power operation are operational constraints—common in wastewater infrastructure, remote monitoring wells, double-walled tank leak detection, and industrial sump applications.

Key Features

• Submersible architecture with 6 m pre-terminated 22 AWG PVC-jacketed twin-core cable—rated for continuous immersion in aggressive aqueous media including sewage, leachate, and process water.
• Field-configurable switching logic: user-selectable normally open (NO) or normally closed (NC) output via internal jumper—enabling deployment as either high-level alarm or low-level pump protection without hardware modification.
• Integrated PBT baffle shield minimizes false triggering caused by surface turbulence, wave action, or fluid agitation—critical for reliable operation in open channels, lift stations, and aerated basins.
• Modular mechanical design: baffle shield is removable to accommodate high-solids environments (e.g., raw sewage, slurry tanks), where debris accumulation would otherwise impede float mobility.
• Compact cylindrical form factor (Ø37 mm × 100 mm L) and 181 g mass allow flexible mounting—free-hanging from tank lids, direct suspension in monitoring wells, or bottom-weighted submersion without anchoring hardware.
• Brass housing provides corrosion resistance per ISO 9223 C3–C4 classification; NBR float ensures compatibility with oils, aliphatic hydrocarbons, and pH 4–10 aqueous solutions.

Sample Compatibility & Compliance

The WA100 is validated for use in non-pressurized, ambient-temperature liquid systems containing suspended solids up to 3% w/w. It complies with IEC 60529 IP68 (submersion at 3 m for 30 days) and meets RoHS Directive 2011/65/EU material restrictions. While not intrinsically safe certified, its passive switching mechanism (no internal power required) permits installation in Zone 2 hazardous locations when paired with appropriately rated external barriers per ATEX 2014/34/EU. The device supports regulatory workflows aligned with EPA Method 1664 (oil & grease monitoring), ASTM D3921 (leak detection in secondary containment), and ISO 5667-3 (water quality sampling point integrity). It is routinely deployed in facilities operating under ISO 14001 environmental management and ISO 45001 occupational health and safety frameworks.

Software & Data Management

As a discrete binary sensor, the WA100 does not incorporate embedded firmware or digital communication protocols. Its output interfaces directly with programmable logic controllers (PLCs), SCADA I/O modules, or standalone alarm panels via dry-contact closure. When integrated with Global Water’s WA400 Level Alarm Controller or WS700 Series Automatic Samplers, the WA100 triggers event-driven actions—including relay latching, audible/visual alerts, time-stamped log entries, and programmable sample initiation—fully traceable under FDA 21 CFR Part 11-compliant audit trails when deployed with validated data acquisition software (e.g., Global Logger Pro v5.2+). All configuration changes—including NO/NC selection and baffle removal—are physically documented during commissioning and retained in site-specific maintenance logs per GLP/GMP Annex 11 requirements.

Applications

• Wastewater treatment: sump pump control, wet well level monitoring, and overflow prevention in lift stations.
• Environmental monitoring: groundwater level tracking in piezometers and nested monitoring wells per USGS NWIS standards.
• Secondary containment: interstitial space leak detection in double-walled fuel storage tanks (ASTM D7946 compliant).
• Industrial process support: feed tank level supervision for chemical dosing systems, boiler feedwater reservoirs, and cooling tower make-up control.
• Drinking water infrastructure: reservoir level verification, elevated tank low-level shutoff, and pump station dry-run protection.

FAQ

Can the WA100 be used in pressurized vessels?

No—it is designed exclusively for open or vented liquid systems operating at atmospheric pressure.
What is the maximum temperature rating of the NBR float?

Continuous service up to +70 °C; short-term excursions to +85 °C are permissible for ≤30 minutes.
Is calibration required prior to installation?

No—mechanical actuation is factory-set; only physical depth adjustment of suspension determines trip point.
Does the WA100 meet UL or CSA certification requirements?

It carries CE marking per EMC Directive 2014/30/EU and LVD Directive 2014/35/EU; UL/cULus listing is not held but may be achieved via system-level evaluation.
How is trip point repeatability verified in field service?

Repeatability is maintained through consistent suspension geometry and verified using calibrated dip tapes or ultrasonic reference measurements per ISO 11663:2021 Annex B.