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Pressure and Temperature Measurement • Thermometers
Bi-Metal Thermometer - Continued • BIMETAL COIL
• Super sensitive bimetallic helix coil • Fabricated to tight tolerances • Heat treated for stress relief
• Silicone coated to minimize pointer vibration and maximize heat transfer and response time • Angular deflection of each coil is tested for perfect match with dial graduation layouts in precision calibration baths designed and built by Tel-Tru with accuracy to ±1⁄10°F
D • IMMERSION:
• Groove around stem shows minimum immersion point on each thermometer • For most accurate reading sensitive portion of stem must be completely immersed
• BIMETAL BUSHING • Pressed into groove on stem • Centers coil in stem
• 302 stainless steel stem wire goes through center of bushing connecting bimetal element to pointer, minimizes coil touching tube wall
• Centering bearings are used at regular intervals on long stem thermometers • STEM
• 304 Stainless steel tubing is welded/drawn and fabricated to exacting tolerances • 316 stainless steel optional
• Standard stem diameter is .250" (6.35mm) – options include .375" (9.52mm), .236" (6mm) and .315" (8mm)
• Stem lengths available from 21⁄2" to 120" • Tip is welded and finished for hermetic seal and unique look
• TEMPERATURE RANGES
• 20 Standard Fahrenheit ranges from -100° to 1000° • 20 Standard Celsius ranges from -75° to 550° • 13 Standard Dual scale ranges • Availability of over 120 ranges developed, may vary by dial size
• OVER TEMPERATURE LIMITS • Up to 250°F: 100% • 250° F to 550°F: 50%
• 550° F to 1000°F: 800°F for continuous use, intermittent use over 800°F
• QUALITY SYSTEM • ISO 9000 comparable • Assures that all materials, methods and processes meet Tel-Tru’s highest standards for form, fit, and function • Statistical Process Control QA methods used to assure component quality and process consistency • Calibration lab for NIST traceable verification of all standard thermometers and measuring instruments used in manufacturing process
• ACCURACY • Per ASME B40.3 Grade A ±1% full span is guaranteed • Calibration is to standards traceable to National Institute of Standards and Testing (NIST) • Tel-Tru methods:
* Most careful and precise in the industry * Produces typical accuracy better than ASME B40.3 Grade AA (1%-1⁄2%-1%) full span