MITR Red-Liquid Glass Thermometer for Water & Oil Temperature Measurement in Industrial and Laboratory Applications

Overview

The MITR Red-Liquid Glass Thermometer is a precision-calibrated, liquid-in-glass (LIG) thermometric instrument engineered for reliable temperature measurement of water, oils, and other non-corrosive liquids in industrial process monitoring, educational laboratories, and quality control environments. Utilizing the thermal expansion principle of organic red-dye alcohol-based fluid sealed within borosilicate glass tubing, this thermometer delivers stable, repeatable readings without the regulatory and safety constraints associated with mercury-containing devices. Designed to ISO 865 and ASTM E1, it operates via direct immersion and visual scale reading, offering a passive, calibration-maintained solution for routine temperature verification where electronic logging is not required.

Key Features

• Borosilicate glass stem and bulb for enhanced thermal shock resistance and chemical inertness against water, mineral oils, and glycol-based fluids
• Red-dye alcohol filling (non-toxic, non-mercury) compliant with RoHS Directive 2011/65/EU and EU REACH Annex XVII restrictions on hazardous substances
• Linear, etched scale with clear black-on-white or black-on-amber graduations; standard increments of 1 °C or 2 °F depending on range configuration
• Calibration traceable to national metrology institutes (NIM, China); optional NIST-traceable certificate available upon request
• Robust construction with reinforced bulb tip and integrated suspension loop for secure mounting in baths or tanks
• No power supply, batteries, or firmware required — ideal for explosion-proof zones, electromagnetic-sensitive labs, and long-term archival use

Sample Compatibility & Compliance

This thermometer is validated for immersion in aqueous solutions, lubricating oils (ISO VG 32–220), heat transfer fluids, and low-viscosity organic solvents. It is unsuitable for use with strong oxidizers (e.g., concentrated nitric acid), halogenated hydrocarbons, or high-vapor-pressure solvents that may diffuse through glass or degrade the dye. Compliant with ISO/IEC 17025:2017 requirements for calibration laboratories, its design meets general-purpose accuracy class B per ISO 3822-1:2019 (Liquid-in-glass thermometers for general use). Not intended for sterile or GMP-critical applications unless accompanied by documented cleaning validation and individual calibration records.

Software & Data Management

As an analog, non-electronic instrument, the MITR Red-Liquid Thermometer does not interface with software, data loggers, or SCADA systems. Temperature values are recorded manually into laboratory notebooks, LIMS entries, or paper-based batch records. For users requiring digital traceability, MITR recommends pairing this thermometer with certified manual entry protocols aligned with FDA 21 CFR Part 11 Annex 11 principles — including controlled access to recording personnel, dated handwritten signatures or electronic equivalents, and audit-trail documentation of all observed readings. Calibration intervals should be established per internal SOPs, typically every 6–12 months or after mechanical impact.

Applications

• Monitoring coolant and quench oil temperatures in metalworking and heat treatment facilities
• Verifying bath temperatures in microbiology incubators, sterilization validation studies, and enzymatic reaction setups
• Field verification of digital sensor drift in HVAC commissioning and chiller plant maintenance
• Classroom instruction on thermal expansion, calibration hierarchy, and uncertainty budgeting in metrology courses
• Backup reference during power outages or electronic instrument failure in QC/QA laboratories
• Temperature spot-checking in food-grade oil storage tanks and pharmaceutical water-for-injection (WFI) distribution loops

FAQ

Is this thermometer calibrated before shipment?
Yes — each unit undergoes factory calibration at two points (typically 0 °C and 100 °C) using reference standards traceable to NIM. A calibration statement is included; NIST-traceable certification is available as an add-on service.
Can it be used in pressurized vessels?
No — this is a standard atmospheric-pressure immersion thermometer. Use only in open baths, tanks, or vented containers. Do not insert into sealed or pressurized systems.
What is the typical measurement uncertainty?
At 20 °C, expanded uncertainty (k=2) is ±0.5 °C for Class B instruments per ISO 3822-1. Uncertainty increases linearly toward range extremes.
How should it be cleaned and stored?
Wipe with lint-free cloth dampened with isopropyl alcohol. Store vertically in protective sleeve, away from direct sunlight and mechanical stress. Avoid rapid thermal cycling beyond ±10 °C/min.
Does MITR provide repair or recalibration services?
Yes — MITR offers recalibration and bulb replacement services through authorized service centers in Changsha and Shanghai. Contact technical support for return authorization and lead time estimation.