JP WRS-1B Automatic Melting Point Apparatus

Overview

The JP WRS-1B Automatic Melting Point Apparatus is a precision optical instrument engineered for accurate, repeatable determination of melting point ranges in solid organic compounds. Based on the principle of optical transmission photometry, the system continuously monitors light transmission through a capillary tube containing the sample as it undergoes controlled thermal ramping. At the onset of melting, a measurable reduction in optical density occurs due to increased light scattering at the solid–liquid interface; this photometric inflection is detected by a calibrated silicon photodiode and translated into precise temperature values. The WRS-1B operates within a thermally stabilized metal block heater with ±0.1 °C temperature uniformity across the sample zone and supports programmable heating rates from 0.5 to 20 °C/min—enabling method optimization per pharmacopeial standards including USP , EP 2.2.17, and JP 18 . Its single-sample configuration ensures minimal cross-contamination risk and simplifies calibration traceability, making it especially suitable for regulated environments where procedural consistency and data integrity are mandatory.

Key Features

• Single-capillary analysis platform with integrated Peltier-controlled heating block and high-stability platinum resistance thermometer (Pt100)
• Alphanumeric LCD display with real-time temperature readout, heating rate indication, and status prompts in English
• Optical detection system based on dual-beam photometry: reference and sample channels compensate for ambient drift and lamp aging
• Automatic identification and logging of onset, clear point, and endpoint temperatures—each timestamped and stored with operator ID field
• Non-volatile memory retains up to 100 measurement records with full thermal profile metadata (ramp rate, final temp, date/time)
• Compliance-ready design: supports manual entry of batch numbers, sample IDs, and analyst initials; all outputs meet minimum ALCOA+ data integrity criteria

Sample Compatibility & Compliance

The WRS-1B accepts standard 1.0 mm OD glass capillaries (length: 80–100 mm), compatible with both loose powder and crystalline samples prepared per ICH Q5C guidelines. Sample loading volume is 1–3 mg, optimized for reproducible packing density and consistent heat transfer. Instrument validation follows IQ/OQ protocols aligned with ASTM E325-22 (Standard Practice for Calibration of Melting Point Apparatuses) and includes verification of temperature accuracy against NIST-traceable reference standards (e.g., caffeine, indomethacin, vanillin). For pharmaceutical QC labs operating under FDA 21 CFR Part 11, the device’s manual data entry workflow—paired with lab notebook integration—enables compliant record retention without electronic signature functionality.

Software & Data Management

While the WRS-1B operates as a standalone unit with embedded firmware, its ASCII-formatted print output (via optional RS-232 or USB-to-serial adapter) is fully compatible with LIMS and ELN systems. All measurements export as tab-delimited text files containing: sample ID, test date/time, onset (°C), clear point (°C), endpoint (°C), heating rate (°C/min), and operator code. Audit trails are maintained manually via printed reports bearing instrument serial number, calibration due date, and environmental conditions logged at time of use. Firmware versioning (v2.4.1+) includes checksum-verified memory writes and power-fail recovery to prevent record corruption during unexpected shutdowns.

Applications

• Pharmaceutical R&D: Verification of synthetic intermediate purity prior to crystallization scale-up
• Quality control laboratories: Release testing of active pharmaceutical ingredients (APIs) per USP monographs
• Academic research: Characterization of polymorph transitions and eutectic behavior in small-molecule libraries
• Contract manufacturing organizations (CMOs): Supporting regulatory submissions with documented, repeatable thermal analysis
• Food and cosmetic ingredient verification: Detection of adulteration or degradation via deviation from reference melt profiles

FAQ

What standards does the WRS-1B comply with for pharmaceutical testing?
USP , EP 2.2.17, JP 18 , and ASTM E325-22 — with built-in reference material verification workflows.
Can the WRS-1B store calibration history internally?
No — calibration records must be maintained externally per GLP; however, each measurement report includes instrument ID and date stamp for traceability.
Is the heating block interchangeable with other JP models?
No — the WRS-1B uses a proprietary thermal module designed specifically for single-capillary geometry and photometric alignment.
Does the device support automated pass/fail evaluation against specification limits?
Not natively — pass/fail decisions require post-acquisition review using exported data in Excel or LIMS; no embedded decision logic is present.
What maintenance is required for long-term photometric accuracy?
Annual verification of photodiode responsivity and lamp spectral output using JP-certified optical test kits (Order Code: OPT-CAL-WRS1B).