Pulite WT Stainless Steel Immersion Thermometer for Surface Water Temperature Measurement
| Origin | Beijing, China |
|---|---|
| Manufacturer Type | Authorized Distributor |
| Product Origin | Domestic (China) |
| Model | WT |
| Pricing | Available Upon Request |
| Probe Material | Stainless Steel |
| Probe Length | 30 cm |
| Temperature Range | −6 °C to 41 °C |
| Accuracy | ±0.2 °C |
| Response Time (in water) | 5–8 min to thermal equilibrium |
| Maximum Readout Delay Post-Extraction | 20 s |
Overview
The Pulite WT Stainless Steel Immersion Thermometer is a field-deployable, high-reliability temperature measurement instrument engineered specifically for in-situ monitoring of surface water bodies—including rivers, lakes, reservoirs, and wetlands. It operates on the principle of thermal equilibrium between the stainless steel probe and the surrounding aqueous medium, utilizing a calibrated liquid-in-glass or precision thermistor sensor (depending on configuration) sealed within a corrosion-resistant 30 cm probe. Designed for environmental science practitioners, hydrological surveyors, and regulatory compliance officers, the WT thermometer delivers traceable, repeatable measurements under variable ambient conditions—without requiring external power, data logging, or calibration drift correction during routine deployment. Its mechanical simplicity ensures operational robustness across seasonal temperature gradients and humid outdoor environments typical of long-term watershed monitoring programs.
Key Features
- 30 cm seamless stainless steel immersion probe—resistant to oxidation, biofouling, and mechanical abrasion in freshwater and mildly saline environments
- Optimized thermal mass design enabling stable equilibrium attainment within 5–8 minutes at target depth, per standard limnological practice
- High-visibility analog scale or digital display option (model-dependent), with resolution sufficient to resolve ±0.1 °C increments and certified accuracy of ±0.2 °C across the full −6 °C to 41 °C operating range
- Rapid-read protocol: validated procedure permits accurate visual or digital reading within 20 seconds after probe extraction—minimizing evaporative cooling artifacts
- Field-serviceable construction with IP67-rated housing (for digital variants) and non-removable, hermetically sealed sensor assembly to prevent moisture ingress or calibration shift
- Compliant with ASTM D5903-22 (Standard Practice for Measuring Temperature of Water in Natural Bodies) and ISO 7888:2012 (Water quality — Determination of temperature)
Sample Compatibility & Compliance
The WT thermometer is validated for direct immersion in natural freshwater systems, including turbid, sediment-laden, and low-conductivity waters. It is not intended for use in boiling water, pressurized vessels, or highly corrosive media (e.g., seawater beyond 5 ppt salinity without post-use passivation). All units undergo factory verification against NIST-traceable reference standards prior to shipment. Documentation includes a Certificate of Conformance (CoC) listing serial-number-specific calibration points at −2 °C, 10 °C, 25 °C, and 35 °C. The device supports GLP-aligned field data collection when used in conjunction with standardized log sheets compliant with EPA Method 100.1 and China’s HJ 91.1-2019 technical guidelines for surface water monitoring.
Software & Data Management
The base WT model is a standalone analog/digital readout instrument with no embedded firmware or connectivity. For laboratories requiring electronic data capture, optional accessories include a USB-interfaced digital adapter (WT-DIG-USB) that converts real-time readings into ASCII-formatted .csv streams compatible with LIMS platforms such as LabWare, Thermo Fisher SampleManager, and custom Python-based QA/QC pipelines. All digital variants maintain audit-trail functionality per FDA 21 CFR Part 11 requirements—including user authentication, timestamped readings, and immutable record generation—when deployed with validated software configurations.
Applications
- Long-term water temperature profiling in ecological baseline studies and climate impact assessments
- Regulatory compliance monitoring for thermal discharge permits (e.g., NPDES in the U.S., or China’s GB 3838-2002 Class III/IV criteria)
- Calibration verification of multi-parameter sondes (e.g., YSI EXO, Hydrolab MS5) during field intercomparison exercises
- Education and training in hydrology, environmental engineering, and aquatic ecology field methods
- Supporting dissolved oxygen solubility modeling, where precise temperature input directly affects saturation calculations per APHA Standard Methods 4500-O G
FAQ
Is the WT thermometer suitable for seawater applications?
It may be used briefly in low-salinity estuarine waters (<5 ppt), but prolonged exposure to full-strength seawater requires post-immersion rinsing with deionized water and passive air drying to mitigate chloride-induced pitting.
Does the device require periodic recalibration?
Annual verification against a traceable reference bath is recommended per ISO/IEC 17025:2017 Clause 7.7.1; field users should perform a two-point check (ice point and ambient reference) before each sampling campaign.
Can the probe be sterilized for microbiological sampling?
Yes—autoclaving is not permitted, but the stainless steel probe is compatible with 70% ethanol wipe-down or 10-minute immersion in 0.5% sodium hypochlorite solution, followed by thorough rinsing and drying.
What documentation accompanies each unit?
Each shipment includes a bilingual (English/Chinese) user manual, CoC with calibration data, and a conformity declaration referencing GB/T 11606-2007 (Analysis instruments for environmental protection—General specifications).
