Manual Thermometers
Mercury, non-mercury (liquid in glass), or bimetallic thermometers with analog displays, for general and application-specific use, with various temperature-range capacities and accuracies; may be traceable or certified to international standards.
In 1714, the mercury-in-glass thermometer was invented in Europe by physicist Daniel Gabriel Fahrenheit. Typically, the mercury is contained in a reservoir that opens to narrow glass tube. The distance that the mercury flows into the tube is dependent on the temperature to which the thermometer is subjected. The space above the mercury may be filled with air or an inert gas, or it may be a partial vacuum.
Thermometers are calibrated by exposing them to a known temperature and then marking the height of the mercury at that temperature. For example, one might calibrate to the freezing temperature of water (0°C or 32°F) by placing the thermometer in a mixture of ice and water. Then the thermometer could be submerged in boiling water to determine the point where the water changes from a liquid to a vapor (100°C or 212°F).
Mercury thermometers are still considered to be some of the most accurate temperature indicators. They can be used for a wide range of temperatures, from -37°C to 356°C (-35°F to 673°F). Modifications such as adding an inert gas above the mercury or replacing the glass with fused quartz can extend the upper temperature limit to as high as 800°C (1,470°F).
Mercury cannot be used below -38.83°C (-37.89°F), the temperature at which it becomes a solid. Moreover, nitrogen in the thermometer can flow down into the column and become trapped if the mercury solidifies, which makes the thermometer unusable. Use a thermometer that contains a mercury-thallium alloy for measuring lower meteorological temperatures – it will remain liquid to -61.1°C (-78.0°F).
Chemglass Life Sciences Thermometer, Non-Mercury, Variable Immersion, -10°C to 250°C, Immersion Range is 76mm to 178mm 3" to 7"), 510mm OAL
Thermometer, Non-Mercury, Variable Immersion, -10¿C to 250¿C, Immersion Range is 76mm to 178mm 3" to 7"), 510mm OAL. Thermometer is mineral spirit filled to eliminate workplace and environmental hazards associated with mercury. Constructed on two types of tubing sealed together below the scale, where the stem portion is made of very fine bore glass to minimize correction factors at immersion depths other than the mid-point of the stem. The scale portion is made of wide bore glass to facilitate reading of the thermometer. Each thermometer is supplied with an instruction sheet and listing of correction factors. All ranges have 1¿ subdivisions. Thermometer has a white back and a 6 to 7mm outer diameter. Can be used with any Chemglass threaded thermometer adapter.
Thermco Products Inc NIST compliant, factory certified glass Spirit thermometer, -1 deg./51 deg.C, 0.2C div, 76mm imm, certified at 0 deg.C, 10 deg.C, 20 deg.C, 30 deg.C, 37 deg.C, 40 deg.C, 50 deg.C, 105 deg.C, 400mm
Thermco Certified Thermometers are used in temperature verification and calibration procedures. These instruments can be used to calibrate Liquid-In- Glass, RTD, Thermistors, Thermocouples, and Bi-Metal Thermometers. The certified thermometers are carefully inspected to insure they conform to exact specifications and are certified against NlST standards. Each thermometer is furnished with a document proving traceability and a felt-lined leatherette storage case.
Hach Company Thermometer, Non-Mercury, -30 to 120°F
Compact and durable, non-mercury thermometers enclosed in a protective nylon case. These thermometers are designed for ruggedness and come in many standard ranges. Suitable for all field and portable uses where an unprotected thermometer may break.
Hach Company Thermometer, Enviro-Safe, Non-Mercury, -10 to 225°C
Enviro-Safe non-Mercury thermometers feature an exclusive biodegradable liquid and dye. Easy to read, aesthetically distinctive due to dark green liquid and permanently fused markings. Each thermometer, individually calibrated against NIST traceable equipment, identified by unique serial number for ISO 9000 or other quality systems.
Thermco Products Inc CERT W/THERM 0,100,101C POINTS
ASTM 121C thermometer (Hg) certified at the ASTM recommended temperatures and calibrated against N.I.S.T. standards. A N.I.S.T. traceable document is completed in the Thermco ISO17025/ILAC accedited laboratory.
Chemglass Life Sciences Thermometer, Non-Mercury, Total Immersion, -20°C to 150°C, 305mm OAL
Thermometer, Non-Mercury, Total Immersion, -20¿C to 150¿C, 305mm OAL. Thermometer is mineral spirit filled to eliminate workplace and environmental hazards associated with mercury. All ranges have 1¿ subdivisions. Thermometer has a white back and a 6 to 7mm outer diameter.