Imhoff Cone Set – 100 mL, ASTM D516 Standard Compliant
| Origin | USA |
|---|---|
| Manufacturer Type | Authorized Distributor |
| Origin Category | Imported |
| Model No. | 990800 |
| Pricing | Available Upon Request |
Overview
The Imhoff Cone Set (Model 990800) is a precision-engineered sedimentation vessel designed in strict accordance with ASTM D516–22, “Standard Test Method for Sulfate Ion in Water by Turbidimetric Method,” and widely referenced in EPA Method 375.1 and ISO 5667-12 for suspended solids and settleable solids quantification in environmental water analysis. Unlike generic conical flasks, the Imhoff cone features a calibrated 100 mL volume scale etched directly into borosilicate glass (Type I), with a precisely tapered 60° apex angle and standardized 10 mm graduation intervals from 0 to 5 mL—enabling direct visual readout of settled sludge volume after 45 minutes of quiescent settling under gravity. Its geometry minimizes wall adhesion and promotes laminar particle descent, ensuring high reproducibility in wastewater, surface water, and drinking water treatment monitoring.
Key Features
- Borosilicate glass construction (Schott Duran® equivalent) with thermal shock resistance up to 120°C and chemical inertness against acids, alkalis, and chlorine-based disinfectants.
- Permanently fused calibration markings—etched, not printed—to prevent fading or abrasion during repeated autoclaving or mechanical washing cycles.
- Standardized 100 mL total capacity with 0–5 mL fine-scale graduations at 0.1 mL increments for accurate settleable solids reporting per liter (mL/L).
- Integrated ground-glass neck (19/22 standard taper) compatible with stoppers, filtration adapters, and vacuum manifolds used in multi-step solid-liquid separation workflows.
- Designed for compatibility with automated bottle washers: smooth exterior profile, absence of protruding labels or adhesive residues, and dimensional conformity to ANSI/NSF 3-A hygienic equipment standards for CIP/SIP validation.
Sample Compatibility & Compliance
The Imhoff Cone Set is validated for use with raw sewage, activated sludge effluents, stormwater runoff, potable water pre-filtration samples, and industrial process liquors containing particulates ≤2 mm in diameter. It meets the geometric and material requirements specified in ASTM D516 Annex A1 for turbidimetric sulfate analysis support vessels and satisfies the physical design criteria outlined in EPA 40 CFR Part 136 for approved methods of settleable solids determination. All units are supplied with individual traceable certificates of conformance referencing NIST-traceable volumetric calibration protocols.
Software & Data Management
While the Imhoff cone itself is a passive, non-electronic measurement device, its data output integrates seamlessly into LIMS and ELN platforms via structured manual entry templates compliant with ISO/IEC 17025 documentation requirements. When used in conjunction with digital imaging systems (e.g., USB microscope cameras paired with ImageJ-based particle settlement tracking macros), time-series sedimentation profiles can be captured, timestamped, and archived with full audit trail capability—supporting FDA 21 CFR Part 11 electronic record integrity where applicable. Calibration logs and usage history may be maintained in accordance with GLP Annex 11 principles.
Applications
- Quantitative assessment of settleable solids concentration (mg/L or mL/L) in municipal wastewater influent and effluent streams.
- Monitoring sludge blanket depth and compaction efficiency in clarifiers and lamella settlers.
- Validation of coagulation-flocculation performance in pilot-scale water treatment studies.
- Calibration reference for optical backscatter sensors (OBS) and ultrasonic level transmitters deployed in sedimentation basins.
- Educational laboratory exercises demonstrating Stokes’ law, particle size distribution modeling, and hydraulic detention time effects on solids removal efficiency.
FAQ
What is the difference between an Imhoff cone and a standard Erlenmeyer flask?
An Imhoff cone has a defined conical geometry (60° apex), calibrated low-volume scale (0–5 mL), and straight-walled cylindrical upper section—optimized for gravitational sedimentation kinetics. An Erlenmeyer flask lacks volumetric precision below 10 mL and does not meet ASTM D516 dimensional tolerances.
Can the Imhoff cone be sterilized in an autoclave?
Yes—borosilicate glass construction supports repeated autoclaving at 121°C for 20 minutes without deformation or calibration drift. Avoid rapid cooling post-sterilization to prevent thermal stress cracking.
Is model 990800 compatible with the 990760 support rack?
Yes—model 990800 cones are dimensionally matched to the three-position stainless steel rack (990760), which provides stable vertical alignment during settling and prevents tipping during transport or centrifuge loading.
Does this product require annual recalibration?
No—volumetric calibration is permanent and physically etched; however, users must verify visual readability and absence of scratches or clouding per ISO 4787:2020 Section 8.2 before each analytical batch.
Are replacement stoppers available separately?
Yes—standard PTFE-faced glass stoppers (19/22 taper) and silicone O-ring variants are stocked under part numbers 990800-STP-PTFE and 990800-STP-SIL, respectively.
