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Member Since 11 Years
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Nagman is a 4 decade old organisation dedicated to the cause of Instrumentation, serving industries in India & worldwide thro’ their Calibration Products & Services and Temperature Sensors. Nagman’s infrastructure & facilities (Manufacturing, Quality Assurance & Calibration), skills & capabilities (with respect to Design & Applications Engineering) are widely recognized (& accepted) by leading project consultants / executants & major industries.
Nagman’s “Centre for Calibration” with its sophisticated facility is accredited by NABL (equivalent to UKAS) for Thermal / Mechanical (Mass & Pressure), Electro-Technical & Fluid Flow Parameters & provide the vital calibration traceability link to the products manufactured by them.
Nagman have pioneered manufacturing Temperature Sensors – Platinum / Nickel & Copper – in India – especially custom designed – to International Standards & have, over the past 3 decades, been involved actively in the manufacture of Thermocouple / RTD – Elements / Inserts / Probes / Assemblies, tens of thousand of which are in good use in industries – in India and overseas. These Probes & Assemblies, produced to meet stringent International Quality Standards are also available in extensive custom design configurations offering ultimate flexibility.
HERMOCOUPLES / RESISTANCE THERMOMETERS– Elements, Inserts, Probes & Assembles with screwed / flanged Thermowells
THERMOWELLS
– Barstock / Built up types
– Coated / Solid Sintered (in Tungsten Carbide) / Carbide Matrix
– Tantalum / Lead clad & Teflon coated (upto 150 micron)
| Type | ISA Type K, J, T, E, N, R, S & B : Simplex / Duplex |
| Standard | ANSI MC 96.1 / DIN 43710 / IEC 584 |
| Insulation | Ceramic beaded / Mineral Insulated |
| Hot Junction | Grounded / Ungrounded |
| Size | |
| Ceramic | 22 / 20 / 16 SWG Base Metals
26 / 25 / 24 SWG Noble Metals |
Probes
| Sheath | SS 304 / 316 |
| OD
Extension Cable | 4 / 5 / 6 / 8 mm
Thermocouple / Compensating Cable |
| Termination | Polarised Connectors / Terminal lugs |
Inserts
Complete with metal sheath, ceramic terminal block mounted on a SS flange disc.
| Ceramic bead insulated | |
| Sheath | SS 316 / Inconel |
| OD | 5 / 6 / 8 mm |
| Mineral Insulated | |
| Sheath | SS 316/Inconel |
| OD | 3 / 4.5 / 6 mm |
| Insulation | Fibre glass / PTFE; SPC / SS braided |
| Fitting | Bayonet / screwed, Adjustable / free running |
| Weld Pad | Mineral Insulated Thermocouples – for skin temperature measurement – supplied complete with contoured WELD PAD, M.I. Thermocouple, clamps etc. |
RESISTANCE THERMOMETER
Elements
| Type | Copper / Nickel / Platinum – Simplex / Duplex |
| Standard | DIN 43760 / IS 2848 / JIS / GOST / IEC 751/ Class B/A |
| Nominal Resistance | Platinum : 46 / 100 ohms
Copper : 53 ohms / 10 ohms Nickel : 100 / 200 ohms |
Other Standards / Nominal Resistance on request.
Inserts
Complete with Metal Sheath, Ceramic Terminal Block mounted on a S.S. Flange Disc.
| Ceramic bead insulated : | |
| Sheath | SS 316 |
| OD | 4 / 5 / 6 / 8 mm; Interior filled with MgO / alumina powder |
| Mineral Insulated : | |
| Sheath | SS 316 / Inconel |
| OD Tip | 6 / 8 mm |
| Extension | 4.5 / 5 mm |
| Transition | 6 / 8 mm |
Probes (Special : Custom Designed / OEM)
2. Thermowells
| Type | Barstock / Built-Up / Protection Sheath |
| Design | |
| Barstock | Single piece solid hexagon / round barstock, deep drilled and machined with a tapered hot end & parallel stock, designed as per ASME PTC 19.3 or to suit the Temperature / Pressure rating velocity etc. Bore dia : To suit OD of insert / element; Bore concentricity within 10% W.T. |
| Built-Up | Beyond 600 mm immersion and for medium pressure application, a built up construction with 100/150 mm tapered barstock drilled tip, welded to seamless ½” sch 40/80 pipe for balance length is offered. |
| Material | SS 304 / 316 / 321 / 310 / 446 / Incoloy / Hastelloy / Monel / Alloy 20 |
| Protection Sheath | Fabricated from seamless tube with hot end plug welded & process connection welded on are available for low pressure applications.
Materials : SS 304 / 316 / 321 / 310 / 446 / Inconel / incoloy / Furnite 4A (for sulphurous atmosphere / hastelloy / Alloy 20) / Monel. Noble Metal (Type R, S) Thermocouples are offered with High alumina / recrystallised alumina sheathing – single or double, with SS reinforcement upto 200 mm from cold end. |
| Specials | For Coal Mill / Abrasive Applications : Solid Sintered Tungsten Carbide / Carbide Matrix Thermowells Single length max 450 mm, OD max 22 mm – Microweld joined, with reinforcement upto 1000 mm.
Barstock / built up thermowells as above with 0.5/1 mm thick tungsten carbide / stellite hard facing / coating for coal mill temperature measurement / flue gas temperature applications. Crown, Bottom, Fore hearth & Multi-depth Thermocouples for Glass Industries. |
3. Process Connections
| Type | |
| Screwed | BSP / Metric / Taper threaded, Integral (for barstock), welded / adjustable for built-up / Fabricated designs. |
| Flanged | Welded & Adjustable; Forged / Plate |
| Material | Screwed : SS 304 / 316 / 321 |
| Flanged | C.S., Alloy Steel, Stainless Steel to ANSI / ASTM standards. |
| Flange Finish | FF, RF, FTJ, SG / ST / LG or to suit |
| Flange Standards | ANSI / DIN / BS |
| Specials | Weldable type thermowells |
TIG welding facilities available.
4. Lagging Extensions
Between Thermowell & Head; only Nipple, Threaded, from ½” sch 80/40 seamless pipe, 100/150 mm long (or to suit) or Nipple/Union/Nipple, BSP/NPT Threaded; Material : C.S. Cadmium / Chromium plated, or SS.
5. Heads
Cast Aluminium, with screwed cap, chain, weather proof to IP 55 / IP 65 / NEMA 4, or Flame Proof / Explosion Proof to IS-2148 (certified by CMRS) / Group II A / II B / II C.
| Cable Entry | ¾” ET / ½” BSP / NPT; other sizes on request. Single or Double entries. |
| Grounding Terminal | Optional. |
| Glands | Single / Double compression Types to suit cable size; Brass / Nickel plated. |
| Chain | Plated Brass Standard, S.S. on request. |
| Finish | Stoving enamelled black paint standard; Epoxy / Acid Resistant paint optional. |
Special miniature Heads in Aluminium / SS / Cast Iron are also available.
6. Terminal Blocks
Ceramic block with High Dielectric strength, glazed
| Terminal | Baked ceramic paint markings |
| Identification | Nickel plated brass (vibration proof terminals optional) |
| Mounting | Anti-vibration spring loaded rivets for positive contact of insert to Thermowell |
| Gasket | Compressed Asbestos (Klingerite) |
| Flange | S.S. / C.S. Nickel Plated; 42/55 mm dia. |
| Fixing screws | 32/45 mm apart, M4. |
7. Name Plate / Identification
Anodised aluminium, giving relevant details, provided at the bottom of inset flange & on the cover of head. S.S. Identification Tag & Punching on flange / thermowells optional.
8. Testing
A) Routine Tests
| a) Calibration | 3 Points over the range. All calibration standards traceable thro’ NABL Accredited Calibration Lab to International Standards. |
| b) Bore Concentricity | For Barstock Thermowells only; in process & after finishing (10% of wall thickness typical) |
| c) Hydraulic Test | Internal / External at specified Test Pressure / Time (100 kg/cm2 typical) |
| d) Insulation Resistance | Cold at ambient temp. as per relevant standards (> 100 MOhms at 30°C at 250 VDC typical) |
| e) Dimensions & Threads | Certified standard ring / plug gauges are used to check threads. |
| f) Nitrogen leak test | For Mineral Insulated RTD’s /Thermocouple Inserts (30 Kg/cm2 pressure). |
Dye Penetrant Test for weld joints – optional.
B) Type Tests – On Sampling Basis (Optional)
| Response Time Test | From 0 to 100°C (boiling water), for inserts / complete assemblies.
(5 to 7 sec. typical for 6 mm OD MITC / RT) |
| Insulation Resistance Tests | Elevated Temp. (5 Mohms at 500°C at 50 VDC typical for M.I.T.C.) |
| Calibration | 5 Points over the range |
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Nazarathpet, Chennai, Tamil Nadu 
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