WQ101 Submersible Water Temperature Sensor
| Origin | USA |
|---|---|
| Manufacturer Type | Authorized Distributor |
| Origin Category | Imported |
| Model | WQ101 |
| Pricing | Available Upon Request |
Overview
The WQ101 Submersible Water Temperature Sensor is a high-reliability, field-deployable precision instrument engineered for continuous, long-term temperature monitoring in aquatic environments. Based on platinum resistance thermometry (Pt100 or Pt1000 configuration, depending on calibration variant), the sensor delivers traceable, stable measurements across a wide operational thermal envelope. Its design adheres to fundamental principles of thermal equilibrium and electrical signal integrity under hydrostatic pressure — critical for applications ranging from limnological research and coastal oceanography to industrial process water monitoring and aquaculture system control. The sensor’s fully potted electronics and hermetically sealed stainless-steel housing eliminate moisture ingress pathways, ensuring measurement continuity even after prolonged submersion in saline, turbid, or biofouling-prone waters.
Key Features
- Fully encapsulated electronics using marine-grade epoxy resin for corrosion resistance and dielectric stability
- Stainless-steel 316L housing rated for extended deployment in seawater and aggressive freshwater chemistries
- Standard 7.6 m (25 ft) submersible cable with Kevlar-reinforced tensile core; extendable up to 150 m without signal degradation when used with appropriate shielded twisted-pair cabling and proper grounding practices
- 4–20 mA analog output with HART-compatible signal conditioning (optional firmware upgrade available)
- Low-power operation compatible with battery-powered data loggers and solar-powered telemetry systems
- Two mechanical configurations: open-water probe (cylindrical, low-drag profile) and inline flow-through housing for pipe or channel installation
Sample Compatibility & Compliance
The WQ101 is validated for direct immersion in natural and engineered water matrices including seawater, brackish estuaries, municipal wastewater effluents, cooling tower circuits, and recirculating aquaculture systems (RAS). It meets IP68 ingress protection rating per IEC 60529 and complies with NEMA 6P environmental enclosure standards. While not certified for explosive atmospheres (e.g., ATEX or IECEx), its passive construction and absence of internal batteries or active electronics render it intrinsically safe for Class I, Division 2 hazardous locations when installed per NEC Article 501. Calibration traceability follows NIST-traceable protocols, and documentation supports GLP-compliant data acquisition workflows. The sensor is routinely deployed in studies aligned with ASTM D5128 (Standard Test Method for Field Measurement of Water Temperature) and ISO 7888 (Water quality — Determination of electrical conductivity).
Software & Data Management
The WQ101 operates as a standalone analog transducer and integrates seamlessly with industry-standard SCADA platforms (e.g., Ignition, Siemens Desigo, Campbell Scientific LoggerNet), PLCs, and programmable data loggers (e.g., HOBO U22, Onset RX3000). When paired with compatible signal conditioners or smart gateways supporting Modbus RTU or SDI-12 protocols (via optional adapter modules), it enables time-synchronized, multi-sensor deployments. All analog output signals are linearized and temperature-compensated within the sensor’s internal circuitry, eliminating the need for post-acquisition polynomial correction in most routine applications. Audit trails, calibration history, and configuration metadata can be maintained in accordance with FDA 21 CFR Part 11 requirements when used within validated data acquisition ecosystems.
Applications
- Real-time thermal profiling in lakes, rivers, estuaries, and continental shelf monitoring networks
- Regulatory compliance monitoring for thermal discharge permits (e.g., EPA NPDES requirements)
- Process temperature verification in HVAC chilled-water loops and industrial heat exchanger circuits
- Environmental impact assessment during offshore construction and dredging operations
- Long-term baseline studies supporting climate change modeling and phenological shift analysis
- Automated feedback control in aquaculture tanks, hydroponic nutrient solutions, and bioreactor systems
FAQ
What is the maximum recommended cable length for maintaining signal accuracy?
For standard 4–20 mA operation, the WQ101 supports up to 150 m when using 22 AWG shielded twisted-pair cable with proper grounding at the controller end. Longer runs require voltage drop compensation or signal repeaters.
Can the sensor be calibrated in-house?
Yes — two-point calibration (at 0 °C and 25 °C) is supported using NIST-traceable reference baths. Full recalibration documentation and certificate generation require use of manufacturer-authorized software tools.
Is the sensor suitable for pressurized pipeline applications?
The inline version (203 mm × 43 mm) is rated for continuous operation at 50 psi (3.4 bar); intermittent exposure up to 75 psi is permissible with prior engineering review.
Does the WQ101 support digital communication protocols out of the box?
No — it natively provides only 4–20 mA analog output. Digital interfaces (Modbus, SDI-12, RS-485) require external signal converters or OEM-integrated gateway modules.
How frequently should field recalibration be performed?
Annual calibration is recommended for regulatory or QA/QC-critical deployments; biannual verification suffices for general environmental monitoring where drift validation is conducted via redundant sensor cross-checking.
