Each ashcroft industrial bimetal thermometer is backed by a limited five year warranty. A bimetallic strip is made up of metal a and b, having different thermal expansion coefficient. Process industrial bimetal thermometer with steel case. The resultant expansion of bimetal is proportional to temperature that is sensed. Guaranteed to be accurate to within 1% of full scale grade a per asme b40.
An antiparallax feature allows for error free reading. The bimetal helix is coated with a viscous silicone to minimize pointer oscillation and improve temperature transmission. Product drawing mounting 1 dial size parameters a b c 100 100 110 21 d. Trend bimetal thermometers are ideal for most rugged industrial temperature measurement applications. Stainless steel pressure gauges also available in different styles and pressure ranges. Wmo recommends to measure atmospheric temperature at the height from. The resultant expansion of bimetal is proportional to temperature. The rototherm range of heavyduty bimetallic thermometers from.
Data sheet bdtb18 bimetal thermometer page 3 of 4 drawings and dimension bdtb18 d drawings dimensions ns d d1 l h s s1 63 68 63 15. Ei bimetal thermometer ashcroft pdf catalogs technical. Bimetal thermometers all stainless steel construction ds. Teltru sanitary pressure gauges are engineered to meet the stringent performance and material demands within dairy, food, chemical, biotechnology and pharmaceutical environments. Bimetal dial thermometer general instruments consortium. Bimetallic devices take advantage of the expansion of metals when they are he. Whether its a thermometer or a thermocouple, different kinds of sensors.
Types of temperature gauges for temperature measurement. Temperature variations cause the bimetal strip to unwind or wind tighter, which in turn rotates the pointer. The range of bimetallic temperature gauges from hma instrumentation are designed for accurate temperature measurement, featuring a reliable, robust design for industrial purposes. Bimetal thermometers are available with a wide range of options, and can offer accurate visual temperature readings from 70600c. Plumbing heating temperature, pressure instruments cooling. Bimetal dial thermometers are simple in construction, yet rugged.
The platinum measurement winding is placed stress free in a slot in a plastic band and. Bimetal thermometer for the process industry per en 190. Ei series bimetal thermometers features 1% full span accuracy asme b40. Liquidfilled gauges preventmoistur condensation build up. The bimetal thermometer employs a bimetal strip in the form of helix it works on the principle of thermal expansion two metals having different coefficient of expansions are joined to form a bimetal. These thermometers use the following two principles. Switch contacts built into mechanical temperature measuring instruments close or open. Economy bimetal models dial size connections peb 212 12 npt brass thermowell peb140 4 peb2 212 b rass wet lfo 34te peb142 4 case zinc plated steel. Bimetal thermometers are actuated by a helical bimetal while gasactuated thermometers use expanding or contracting gas in a closed bulb and capillary system. Adjustable angle bimetal thermometer reotemp instruments. Thermometer winters bimetallic thermometer trupply llc. The transistor as a temperature sensor thermal properties. The measuring system itself is filled with a liquid. Now were going to talk about winters tbm series, which is the bimetal thermometer.
Bimetal thermometers all stainless steel construction ds 4, 5, 6 100125150 mm these instruments are designed for use in chemical, petrolchemical processing industries. This condition shows up as a failure of the thermometer to read accurately below 32f or 0c. Noshoks eight year warranty applies to our 3 and 5 300 series bimetal thermometers. As a temperature measuring device, the bimetallic element, similar in design to that of the actuator. Temperature is the most commonly measured process parameter in the world as it is often critical to the success or failure of a process. The highquality thermometer has been designed especially for the requirements of the process industry. Bimetal thermometers all stainless steel construction ds 4. An extremely responsive temperature sensing helix which has been carefully sized and tested, heat treated and aged to relieve inherent stresses and ensure continued accuracy. This thermometer is the most common used in, mainly, the industrial application. The different expansions force the flat strip to bend one way if heated, and in the opposite direction if cooled below its initial temperature. Epdm dial ranges over 500f 260c lens glass, polycarbonate, or safety glass wetted components listed in italics. Bimetal stainless steel thermometer with bottom or back entry and anyangle versions available.
Xs1 silicone free xyw 316 ss housing4 and stem 1 2560 lengths available. The speciallydesigned head provides for 180 movement, allowing users to set the best position for maximum readability upon installation. Especially in the chemical and petrochemical, oil and gas, and power engineering industries, the temperature measuring. The maximum length recommended for bimetallic temperature gauge should be taken as 700 mm. The bimetal thermometer measures by thermal expansion. Consult ashcrofts ei bimetal thermometer brochure on directindustry. The sensor signal, proportional to the deflection, is converted to an electrical output signal via an amplifier us patent no. Bimetallic thermometer hereafter referred to as simply thermometer is a coiling. Since my grandfather harry germanow started making household products in 1916 to todays temperature and pressure instruments, serving industrial, commercial, and oem markets, our tradition has been to meet or exceed customer expectations. Otherwise known as a bimetallic dial thermometer, they operate by employing the use of two dissimilar metals that react to temperature at. Wika s unique twin temp thermometers combine the accuracy, reliability and easy to read dial of a bimetal thermometer with the precision readout and data. Expansion temperature gauge an expansion temperature gauge consists of a temperature sensor, a capillary and a bourdon tube. The strip consists of two strips of different metals which expand at different rates as they are heated. They are used in almost every area of manufacturing, but are especially suited for laboratories, food processing, concrete, asphalt and oem equipment.
The model 55 bimetal thermometer has been developed and is manufactured in accordance with the en 190 standard. The correction is for the temperature of the gauge, not the temperature of the measured medium. Instruction manual bimetal thermometer model a ashcroft. A bimetallic strip is used to convert a temperature change into mechanical displacement. Bimetal plus b i m e t a l t h e r m o m e t e r s all dimensions are nominal.
Product drawing mounting 1 dial size parameters a b c 100 100 110 21 d 689. Bimetal dial thermometers are simple in construction, but rugged. Furthermore, other than heat measurement, the bimetal temperature gauge are also vital when dealing with areas that require temperature regulations like in the storage of perishable products. Bimetal element varies with temperature range dampening media silicone free inert gel lens gasket neoprene dial ranges 500f 260c and under. Bimetal thermometers are a simple and cost effective way to achieve a visual indication of temperature in a process. Noshok guarantees all products to be free from defects in material and workmanship, to remain.
An expansion temperature gauge consists of a temperature sensor, a capillary and a bourdon tube. Bimetal thermometers operating below freezing must have a perfectly tight case to prevent entrance of moisture which eventually will condense and freeze inside the stem. There is a long history of superior quality in engineering, manufacturing and customer service of these products. Two metal strips of identical length at a given temperature having high. Bimetal thermometers generally come in 304 stainless steel cases. The bimetal system is helically wound and heat treated for long term stability.
The curvature of the bimetal changes in response to temperature variations, and this. Lets talk about how a bimetal thermometer works and how theyre set up. Economy bimetal models dial size connections peb 212 12 npt brass thermowell peb140 4 peb2 212 b rass wet lfo 34te peb142 4 case zinc plated steel ring 304 stainless steel stem brass, 9mm diameter. If a thermostatic bimetal element is initially straight or has an initial uniform curvature, the resulting curvature for uniform temperature change is uniform. When the temperature changes, the free end of the temperature sensor.
They are built to resist the most severe operating conditions created by the ambient environment and the process medium. This emphasizes key information for efficient, fault free operation. The required manual reading of the liquidinglass thermometer often induces errors far. An antiparallax feature allows for errorfree reading. All metals change in dimension, that is expand or contract when there is a change in temperature. For this reason it is important to avoid damage to the glass front while the. The hermeticallysealed case offers protection from weather and dust and is guaranteed against fogging up. Since my grandfather harry germanow started making household products in 1916 to todays temperature and pressure instruments, serving industrial, commercial, and oem markets, our tradition has been to. Ashcroft bimetal thermometers and gas actuated thermometers provide easytoread temperature measurement on a dial indicator. The bimetal type temperature gauge series tetrotemp 100, are made of two cold welded metal strips with different thermal expansion coefficient. Bimetal temperature gauges are available with a scale range of 70. Anodized aluminum with black marks on satin matte finish background. External adjustment permits zero reset from outside the case. Digital temperature gauge with rtd and thermocouple input.
Back connect thermometers are ideal for local, eyelevel temperature readings in most process applications. The bimetal thermometer employs a bimetal strip in the form of helix, it works on the principle of thermal expansion two metals having different coefficient of expansions are joined together to form a bimetal. The bimetallic thermometer uses the bimetallic strip which converts the temperature into the mechanical displacement. Temperature gauges operate on the gasactuated, bimetal or expansion principle. Bimetal temperature gauges operate with a measuring system in the form of a helical or spiral tube. The great success of the bimetal thermometer is due to its outstanding.
This highquality thermometer has been designed especially for the requirements of the process industry. Bimetal thermometer model 55, highquality process version. Noshok type 150 bimetal thermometers are high quality, costeffective, and designed for general purpose testing applications or where a weatherresistant, tamperproof case is required. The bimetal thermometer was designed to be a less accurate, but more rugged measuring device than the glass thermometer. To allow optimum fitting to the process, individual insertion lengths and different process connections can be selected. Configure product now request a quote adjustable angle bimetal thermometer reotemps bimetal thermometers are reliable and accurate temperature sensors requiring no electricity or wiring. Mm minmax pointer this is a manual indicator that is moved by the temperature indicator and shows the max. They are used for measurement of temperature in most of the industrial applications. Versions are available with up to ip68 ingress protection and atex versions are avialable for use in potentially epxplosive atmospheres.
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