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Temperature Switches
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A Thermowell is a protective enclosure for Temperature Gauges and Temperature Sensors ( Inserts), which enhance the life of the Inserts from the corrosive and abrasive( harsh) service conditions at the installation point without affecting the performance of the Temperature Sensors or Gauges. A Thermowell allows the temperature sensor to be removed and replaced without compromising either the ambient region or the process.
We at Goa Instruments, strive to provide Thermowells, which suit the Process Parameters like Pressure, Temperature, Density, Viscosity, and Velocity in accordance with International PTC Standards.
Three Major Types of Thermowells.Using BarBar Stock Thermowells are offered for Insertion Lengths up to 600mm as a Standard.
Insertion Lengths can also be provided up to 900mm in Bar Stock if required.
Fabricated Thermowells are generally preferred for Insertion Lengths above 600mm.
We have a IN HOUSE Wake Frequency Calculator , in accordance with ASME PTC 19.3 TW-2010 for determining the Insertion Length and the Type of Construction best suited for the Process Parameters as required by the Client.
Our extensive internal database, on material selection, for the Thermowells , assist us in recommending and suggesting a suitable MOC for the product which will bring out the Optimum performance of the Thermowells under the process parameters and different types of Process Fluids.
We also offer Thermowells with Sleeves, Coatings and Linings customized to suit the Clients requirements.
Thermowells with more than one material as MOC can also be offered for minimizing cost and improving the efficiency, response and longetivity of the Thermowell under harsh and corrosive conditions.
| Type: | Bar Stock Flanged ( BF), Bar Stock Threaded (BT), Bar Stock Weld In (BW) |
| Std rod diameter in mm | 28,32,34,36,45,50,55 (any other on request). Hex Head can also be provided |
| Material of Construction(M.O.C) For Bar and Flange : |
SS304, SS316, SS310, SS321, SS446, SS316L, SS317, CS, A105 INCOLOY- 825, INCONEL- 600, INCOLOY-800, HASTELLOY C-276, MONEL-400, TITANIUM-II, NICKEL-200, KANTHAL (Any other on request) |
| CONSTRUCTION | Straight, Tapered, Stepped |
| INSTRUMENT CONNECTION | ½”NPT(F), ½”BSP(F), ½”BSPT(F), PF(F), NPSM(F) (any other on request) in all thread sizes |
| PROCESS CONNECTION | For Flanged Type (As per ANSI, BS, JIS, DIN or any other) Size - ½”, 1”, 1 ½”,2”,3” (any other on request) Rating - 150#, 300#, 600#, 900#, 1500#, 2500# Facing - RF, FF, RTJ, LT, LG, WNRF, SORF (any other on request) For Threaded Type Size - ¼”, 3/8”, ½”, ¾”, 1”, 1.1/4”, 1.1/2” ( Any other on request) Threads - M18X1.5, M20X1.5, M24X1.5, M27X2, M33X2 (any other on request) NPT, BSP, BSPT, PF, NPSM (any other on request) For Weld In Type Socket Weld, Direct Weld. |
| BORE in mm | 6.5, 7, 8.5, 9, 10.5, 11, 12, 13 (any other on request, suitable for the Insert OD) |
| COLD END DIAMETER in mm | Provided as per requirement |
| HOT END OD in mm | Provided as per requirement |
| INSERTION LENGTH “U” in mm |
Provided as per requirement |
| EXTENSION LENGTH ”T” in mm |
Provided as per requirement |
| TIP THICKNESS in mm | Provided as per requirement( Standard-6mm) |
| WALL THICKNESS in mm |
2.5mm as a standard ( Any other as per Bore / Hot End OD size) |
| SURFACE FINISH | 16-32 Rs as standard 4 to 12 Ra on request |
| WELDING FOR FLANGED TYPE TW |
By TIG( Argon) “V” Groove welding on both sides of Flange. |
| ADDITIONAL REQUIREMENTS |
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Indicating temperature switch combines indication with switching (in order to make or break the associated electrical circuit). Can be offered with contact assembly as well as microswitch assembly (as a combination of switch and movement)
FeaturesCombination of indication and switchingFast responseChoice of contact assembly or microswitchSwitching accuracy 2%FSDHigh repeatability and low hysteresisCase compensated system
| System | Mercury filled or Gas (N2) filled case compensated in accordance with SAMA C1. V B/IIIB |
| Dial | 100mm or 150mm, white anodised, black markings |
| Case | SS304 / SS316 with bayonet bezel or Aluminium Case/Bezel (See note) |
| Protection | Weatherproof to IP - 67 (IS/IEC 60529:2001) |
| Window | Acrylic |
| Pointer | Aluminium, black |
| Stem | SS304 or SS316, 6mm, 8mm,10mm,12mm |
| Connection | 1/2" NPT (M) adjustable three piece compression fitting as standard |
| Capillary | 1/2" NPT (M) adjustable three piece compression fitting as standard |
| Capillary Covering | SS Solid drawn SS covered or SS armoured or SS covered with PVC up to 10 Mtrs for Mercury Filled and 25 Mtrs for Gas Filled. |
| Range | (-) 40°C to 600°C with a minimum span 50°C for mercury filled temperature switch / (-)200 to 600°C or upto 0-800°C for gas filled temperature switch (minimum span 80°C) |
| Accuracy | ± 1% FSD for indication, ± 2% FSD for switching |
| Over range | 125% FSD as standard (130% FSD on request upto 500°C) |
| Contacts | 1) 1 SPST, single, normally open, closed on rise in temperature or vice versa, rated 30 VA @230V AC 2) 2 SPST, two contacts, independently adjustable, one normally open other normally closed or both normally open or both normally closed, rated 30VA @ 230 V AC 3) 1 SPDT, single microswitch, adjustable over entire range, rated 5 amp @ 230 V AC (3A @ 28 VDC) 4) 2 SPDT, double microswitch, adjustable over entire range, rated 5 amp @ 230 V AC (3A @ 28 VDC) |
| Accessory | Relay for the contact assembly to suit 5 amp @ 230 V AC, separately mounted. |
| Note | 1) 2 SPDT only in 150mm dial size. 2) SPDT contacts in SS case only 3) SPST contacts in Aluminium Case only 4) For minimum immersion length essential for proper sensing, contact our design department. |
| Advantages of Microswitch Type Models | 1) Microswitch is rated 5 amp @ 230 V AC (3A @ 28 VDC). No relay is required. 2) Microswitch assembly is imported, having combination of movement and switch. 3) Microswitch assembly gives better switching accuracy. Compact design. |
A thermocouple is a device that is used for measuring temperature. It basically consists of two dissimilar metals , that are joined to form a junction, which when heated , produce a thermoelectric voltage. This voltage changes as the temperature increases or decreases. Thermocouples are self powered and require no external form of excitation. Thermocouples are widely used in science and industry applications include, temperature measurement for kilns, gas turbine exhaust, diesel engines, and other industrial processes
| Element | J,K,E,T,N, Type (Simplex or Duplex) |
| Sheath OD | 3mm, 6mm, 8mm, 10mm ( Any other size on request) |
| Sheath Material | SS316,SS321, INC 600, SS310 ( Any other on request) |
| Insulation | Mineral Insulated , Compact Mgo ( Over99% Purity) |
| Calibration STD | IEC-584/ ANSI MC 96.1 ( Class 1 or 2) |
| Junction | Grounded, Ungrounded, Exposed |
| Open End | Pot Seal, Plug & Jack, Terminal Block with SS Disc |
| Head | Die Cast Aluminium, SS304,SS316 (Simplex/Duplex) with one or two cable entries. |
| Protection | Weatherproof to IP 67 Flameproof IIA, IIB as per IS/IEC:60079-1:2007. Flameproof IIC as per IS/IEC:60079-1:2007. |
| Cable Entry | ¾" ET, ½" NPT, ¾" NPT( Any other on request) |
| Extension | Nipple Union Nipple assembly In Cd plated Cs,SS304,SS316( Any other on request) Minimum 100 mm but 150mm as a standard .( Any other on Request) : Adjustable Gland( NPT,BSP,) ( Any other on request) In SS304,SS316( Any other on request) : Nipple 75mm/100mm long as standard, any other on request : In Cd plated Cs, SS304 ,SS316 as standard, ( Any other on request) |
| Process Connection: | ½", ¾" as standard.( Any other on request) |
| Accessories | Single/Double Compression Cable Gland in Ni Plated Brass, SS304, SS316( Any Other on Request) : Metallic Plug for Head in Aluminium, SS304, SS316( Any other on Request) |
| Optional | Can be provided with Head/ Remote Mounted Transmitter Can Be provided with all types of Thermowell |
| NOTE FOR BEADED TYPE OF RTD :1. Normal Ceramic Beaded Thermocouples packed with MgO powder and encapsulated with sensing metallic Tube can also be supplied. 2. For selection of Thermocouple with respect to temperature please refer our selection chart A and B |
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Such Type of thermocouples are ideal for the reliable measurement of tube wall temperatures in fired heaters which is important for prolonging tube life and ensuring safe and efficient operation.
The Tube temperature Thermocouple is designed to be responsive to tube wall temperature by placing the thermo-junction in fused contact with the tube wall thus providing a direct and total metallic heat transfer path from the sheath to the Tube wall. Such type of thermocouples provides better accuracy, superior reliability, improved longevity and ease of installation . Tube or Skin type thermocouples can be designed and factory formed to suit nearly any installation or application based on the clients requirement.
Flameproof Indicating temperature switch combines indication with switching (in order to make or break the associated electrical circuit). Can be offered with microswitch assembly (as a combination of switch and movement)
FeaturesCombination of indication and switchingFast responseSwitching accuracy 2% FSDHigh repeatability and low hysteresisFlameproof housingCase compensated system
| System | Mercury filled or Gas (N2) filled case compensated in accordance with SAMA C1. V B/IIIB |
| Dial | 100mm (Internal), white anodised, black markings |
| Housing | Flameproof to IIA IIB (Equivalent to NEC C1. I Div 2 Gr. C & D) |
| Housing Material | Aluminium LM 6 |
| Dimensions | 230mm x 255mm |
| Window | Toughened Glass |
| Stem | SS304 or SS316, 6mm, 8mm,10mm,12mm |
| Connection | 1/2" NPT (M) adjustable three piece compression fitting as standard |
| Capillary | SS Solid drawn |
| Capillary Covering | SS covered or SS armoured or SS covered with PVC up to 10 Mtrs. For Mercury filled and 25 Mtrs for Gas filled. |
| Range | ((-) 40°C to 600°C with a minimum span 50°C for mercury filled temperature switch / (-) 200 to 600°C for gas filled temperature switch (minimum span 80°C) |
| Accuracy | ± 1% FSD for indication, ± 2% FSD for switching |
| Over range | 125% FSD as standard (130% FSD on request upto 500°C) |
| Contacts | 1) 1SPDT, single microswitch, adjustable over entire range, rated 5 amp @ 230 V AC (3A @ 28 VDC) 2) 2 SPDT, double microswitch, adjustable over entire range, rated 5 amp @ 230 V AC (3A @ 28 VDC) |
| Note | 1) Surface mounted flameproof housing is available with capillary. 2) Flameproof (conforming to IIC) version also available with microswitch. 3) For minimum immersion length essential for proper sensing, contact our design department |
| Advantages of Microswitch Type Models | 1) Microswitch is rated 5 amp @ 230 V AC (3A @ 28 VDC). No relay is required 2) Microswitch is imported from reputed international supplier as combination of movement and switch. 3) Microswitch assembly gives better switching accuracy. Compact design. |
Thermocouples are generally used with an outer protecting tube or pocket / thermowell to protect it from corrosive process conditions. This improves the life of the thermocouple. However, response time is compromised.
To overcome above problem, MI Thickwall Thermocouple are designed having thicker wall with relatively larger conductor diameters. This construction enables the user to insert the thermocouple directly in the process medium without a protecting tube or pocket/ thermowell, thus improving the response time to a great extent in some process conditions.
Thickwall thermocouple offers high performance and longer life in harsh process environments, providing improved resistance to temperature, vibration, impact, corrosion and abrasion.
These type of thermocouples, are very well suited to harsh, high temperature process environments such as incinerators, heat treatment furnaces and industrial ovens, and hence can be used effectively for measuring the temperature of molten metal also.
In such type, the gap between the element and the thick wall sheath is densely filled with high purity magnesium oxide (MgO), which prevents any residual air from penetrating the sheath and enables the product to withstand severe conditions, providing excellent corrosion and heat resistance.
This enables faster response times compared to conventional standard thermocouple assembly. The thermocouple element is protected by the thick wall sheath and high purity magnesium oxide, which can be supplied in large diameters with a very thick wall sheath providing a high resistance to vibration and impact shocks
| Element | J ( Iron constantan) K ( Chromel alumel) E ( Chromel constantan) |
| Sheath Material | SS316, SS310, INCONEL 600, INCOLOY 800, SS446 |
| STD Sheath Diameter | 10mm, 12.7mm, 15mm, 17mm,19mm |
A Indicating Pressure Switch is a form of switch that closes an electrical contact when a certain set pressure has been reached on its input. It offers a dual advantage of Indication and Switching. The switch may be designed to make contact either on pressure rise or on pressure fall. Because of their robust design, they are suitable for harsh environment and most corrosive media and meet stringent demands to bring the advantages of high accuracy, long term stability and protection against water jets and dust on their moving parts.
FeaturesReliable and accurate multi-stage Pressure SwitchesDual Performance of Indication and SwitchLow HysterisisFlameproof or Weatherproof Housing
| Dial | 100mm,150mm, in aluminium white background with black markings |
| Case | SS304 with Bayonet Bezel as a standard SS316, Diecast Aluminium with screwed bezel, epoxy painted black (on request) |
| Protection | Weatherproof to IP-67 (IS/IEC 60529:2001), Flameproof to IIA IIB |
| Bourdon Size | 63mm dia as a Standard, 110mm dia (on request) |
| Bourdon Material | SS316 as Standard, Monel on request |
| Socket Material | SS316 as Standard, Monel on request |
| Movement | SS304 / SPDT Microswitch movement (Imported from Germany) as per the type of switch required |
| Range | (-)1 to 600 kg/cm2 |
| Accuracy | ±1% FSD for Indication and ±2% FSD for Switching |
| Over range | 130% FSD |
| Blow Out Disc | Provided |
| Contacts for Switching | a) 1 SPST, Single, Open Normally, Closes on rise in Pressure or Vice Versa rated 30VA@230VAC b) 2 SPST, Dual Contacts, Individually adjustable, one closed one open, both open, both closed rated 30VA@230VAC c) 1 SPDT, Single Microswitch, adjustable over entire span rated 5A@230VAC d) 2 SPDT, Dual Microswitch, adjustable over entire span rated 5A@230VAC |
| Optional | 1) Glycerine Filled Case 2) NACE Certification |
High Temperature Thermocouples are especially designed for the temperature range from 600 C upto 1600 C. Noble metal thermocouples (also called rare metal thermocouples) are used to make the thermocouples. The most common types are R, S & B rare metal thermocouple assemblies. Major Applications include, Glass Industry, Steel Plants, electric arc furnace etc.
| Element | R, S, B ( PtPt Rh Type) (Simplex or Duplex) |
| Sheath OD | 6mm, 8mm, 10mm, 12mm |
| Sheath Material | Inconel 600, SS310 |
| Insulation | Ceramic Beaded , KER 710 Insulation packed with Mgo Powder. |
| Calibration STD | IEC-584/ ANSI MC 96.1 ( Class 1 or 2) |
| Junction | Ungrounded |
| Open End | Terminal Block with SS Disc |
| Head | Die Cast Aluminium, SS304,SS316 (Simplex/Duplex), with One or Two Cable entries |
| Protection | Weatherproof to IP 67 Flameproof IIA, IIB as per IS/IEC:60079-1:2007. Flameproof IIC as per IS/IEC:60079-1:2007. |
| Cable Entry | ¾" ET, ½" NPT, ¾" NPT( Any other on request) |
| Extension | Nipple Union Nipple assembly In Cd plated Cs,SS304,SS316( Any other on request) Minimum 100 mm to 150mm as standard .( Any other on Request) : Adjustable Gland( NPT,BSP,) ( Any other on request) In SS304,SS316( Any other on request) : Nipple 75mm/100mm long as standard, any other on request : In Cd plated Cs, SS304 ,SS316 as standard, ( Any other on request) |
| Process Connection: | ½", ¾" as standard.( Any other on request) |
| Accessories | Single/Double Compression Cable Gland in Ni Plated Brass, SS304, SS316( Any Other on Request) : Metallic Plug for Head in Aluminium, SS304, SS316( Any other on Request) |
| Optional | Can be provided with Head/ Remote Mounted Transmitter Provided with Protecting Tubes made out of a. KER 710 b. Barstock Inconel 600 c. Fabricated in Inconel 600 with sensing portion in Bar stock |
A Resistance Temperature Detector (RTD) senses heat, based on the principle, that a change in temperature, results in a corresponding change in the resistance of a wire. A small excitation current is passed along the element, the resultant voltage is measured and converted to units of temperature.
RTDs have achieved a well deserved reputation in various Industries for their superior stability and accuracy. The result makes these devices well suited for a wide variety of applications.
| Element | 1 x Pt100 or 2 x Pt100( Simplex or Duplex). ( Any other like Pt 1000, Pt 46 etc on request.) |
| Range | 0 to 500 Deg C |
| Sheath OD | 3.2mm,5mm, 6mm,8mm ( Any other size on request) |
| Sheath Material | SS316, as Standard, SS316L, SS321 on request |
| Insulation | Compact Mgo ( Over99% Purity) for Metal sheathed Type and Ceramic for Beaded Type |
| Calibration STD | IEC-751/DIN 43760( Class A or B) |
| Conductor | Copper for MI type and Silver only for Beaded type, Nickel for MI type on request. |
| Configuration | 2 Wire, 3 Wire, 4 wire |
| Open End | Pot Seal, Plug & Jack, Terminal Block with SS Disc |
| Head | Die Cast Aluminium, SS304,SS316 (Simplex/Duplex) with one or two cable entries. |
| Protection | Weatherproof to IP 67 Flameproof IIA, IIB as per IS/IEC:60079-1:2007. Flameproof IIC as per IS/IEC:60079-1:2007. |
| Cable Entry | ¾" ET, ½" NPT, ¾" NPT( Any other on request) |
| Extension | Nipple Union Nipple assembly In Cd plated Cs,SS304,SS316( Any other on request) Minimum 100 mm but 150mm as a standard .( Any other on Request) : Adjustable Gland( NPT,BSP,) ( Any other on request) In SS304,SS316( Any other on request) : Nipple 75mm/100mm long as standard, any other on request : In Cd plated Cs, SS304 ,SS316 as standard, ( Any other on request) |
| Process Connection: | ½", ¾" as standard.( Any other on request) |
| Accessories | Single/Double Compression Cable Gland in Ni Plated Brass, SS304, SS316( Any Other on Request) : Metallic Plug for Head in Aluminium, SS304, SS316( Any other on Request) |
| Optional | Can be provided with Head/ Remote Mounted Transmitter Can Be provided with all types of Thermowell |
| NOTE FOR BEADED TYPE OF RTD : Resistance Temperature Detectors with Conductors of Silver, in Ceramic Beaded Construction , and packed with MgO powder and encapsulated in a sensing Metallic Tube in SS316.(Any other material on request) can be supplied | |
Instruments Industries Pvt . Ltd (Instruments Industries Pvt . Ltd)
710, Shakuntla Apartments, 59, Nehru Place, New Delhi 110 019, India
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