Thermocouples & Temperature Sensors for Industrial

Salient Features
In a process industry the temperature detector is an integral part of the machine, and is subjected to various shocks vibrations in a rotating machine. It may be subjected to direct compression forces as in case of slot RTDs. We manufacture our RTDs Accordingly; All the Materials used are as per particular process requirements. The reproducibility is a very important factor. We ensure proper reproducibility in long run of use.
For some requirements, IR values are very important; we ensure proper sealing for good IR values. Where high voltage surges are likely the RTDS are tested for enhanced high voltage values. For some applications thermal response time is an important factor we test and declare the value for each type.
For RTDs which are to be embedded in the rotating machines the long run reliability is ensured by a vibration and compression proof design.
For bearing metal temperature measurements, air, gas or flue gases requirements and for pipeline measurements sealed units Assembled with or without thermowells are available.
Some of the RTDs are provided with interchangeable measuring inserts especially in thermowell type measuring systems.
Protective tubes
The elements (Sometimes measuring inserts) are protected in metal sheaths, it is constantly subjected to hazardous conditions and material of protective tubes is decided as per DIN43763 and DIN 437230. Normally for temperatures up to 600'C SS304, SS316 and SS321 sheathe are used. Thermowells are made of SS321 or chromium molybdenum wieldable alloy steels.
Connection heads
These are light metal alloy weather proof to IP. 67 (IS2147) category heads with hinged lids. The heads are provided with one or more cable entry glands as per customer choice. The connection Terminal Block is of pure Alumina with plated brass terminals.

Terminals ensures very good grip of inside and outside leads.
Thermal Response
Even slight difference in wall thickness or material will cause substantial increase in Thermal Response Time and values are reported accordingly.
Leads
The RTDs with Integral leads such as slot RTDs are provided with silver plated copper conductor having PTFE insulation. Some designs are provided with braids of SPc or SS and again provided with PTFE jacket, other leads available are of silicon and ETFE for nuclear radiation resistance. All the leads are tested for enhanced HV, IR and pull test values. The specs conform to BHEL Customer requirements.
Each RTD/TC is provided with with following Routine test.

• Calibration accuracy at minimum2 points
• Material T.C
• Dimensions TC
• H.V.test results (for RTD's'only)
• IR test results
• Hydraulic pressure test for'thermowells

Each lot is tested for followings additional tests.

• Lead Pullout test.
• Insulation resistance at elevated Temperature.
• Thermal response time test.

Type test for RTD’s as per BS 1904:84,IS 2848:86 are conducte regularly (IS 7358 for TC’s)

• Accuracy test for full range.
• Thermal Stability test.
• Vibration / Endurance test.
• Pressure / Compression strength test.
• Measuring insert leak tightness test.
• IP-55 weather proof test for connection head.
• Immersion error test.
• Thermo electric effect test.
• Thermal response time test.