Tender For Procurement Of Various Temperature Measurement Instruments Thermocouples And Rtds Installed At Different Auxiliaries And Locations In Btg And Bop Area At 2X600mw, Sstpp, Mppgcl, Dongalia, Khandwa-Madhya Pradesh

Procurement Of Various Temperature Measurement Instruments Thermocouples And Rtds Installed At Different Auxiliaries And Locations In Btg And Bop Area At 2X600mw, Sstpp, Mppgcl, Dongalia , Fw Temp At Eco I / L , Fw Temp At Eco Outlet Left & Right , Stm Temp At Ltsh I / L Hdr L & R , Stm Temp At Rh I / L Hdr-L & R , Heating Stm Temp Aft Hotcv , After Sbprv Temp , Ms Temp At Sh 0 / L- L & R , Hrh Stm Temp At Rh 0 / L L & R , Stm Temp At Ltsh 0 / L Temp L&R , Sh Div Panelette 1 / L Temp – L&R , Platen Sh I / L Temp L&R , Sh Platen 1 / L Hdr Temp L&R , Sec. Air Temp. L&R , Primary Air Temp. Atah-O / L , Sec. Air Temp. Atah- O / L , Fg Temp At Ah - I / L , Mixed Air Temp. Beforemill , Mill O / L Temp. ( For Fire Protection ) , Fg Temp At Ah 0 / L , Fg Temp At Id Fan I / L , Rtd Pt 100 Location: Fd Fan Bearing Rtd Configuration : Head Less Assembly Element Type : Rtd Pt 100 No Of Element : Duplex No Of Leads : 3+3 Wire , Rtd Rtd Pt 100 Location: Pa Fan Bearing Rtd Configuration : Head Less Assembly Element Type : Rtd Pt 100 No Of Element : Duplex No Of Leads : 3+3 Wire , Rtd Pt 100 Configuration : Head Type Assembly Element Type : Rtd Pt 100 Location: Bearing No Of Element : Duplex , Rtd Pt 100 Rtd Pt 100 Bhel Part No.: 962561900000 Configuration : Head Less Assembly Element Type : Rtd Pt 100 No Of Element : Duplex No Of Leads : 3+3 Wire , Thermocouple Configuration : Head Type Assembly Element Type : K Type Thermocouple Location: Bcw Boiler No Of Element : Duplex Calibration Standard: As Per Iec 60584 , Thermocouple Configuration : Head Type Assembly Element Type : K Type Thermocouple Location: Bcw Boiler No Of Element : Duplex Calibration Standard: As Per Iec 60584 Accuracy Class : Class Ii , Rtd Pt 100 Configuration : Head Type Assembly Element Type : Rtd Pt 100 Location: Mill Thrust Pad Bearing No Of Element : Duplex Calibration Standard: As Per Iec 60751 Accuracy Class : Class B , Rtd Pt 100 Configuration : Head Type Assembly Element Type : Rtd Pt 100 Location: Mill Shaft No Of Element : Duplex Calibration Standard: As Per Iec 60751 Accuracy Class : Class B , Rtd:- Element: Pt-100X2, Type: Duplex, 4 Wires, Head: Die Cast Alu. Weather Proof Ip-67, Terminal & Ceramic Block, Cable Entry: 01 No. , 1 / 2 Npt ( F ) , With Cable Gland, Standard: Cali: Iec 60751, Class-B Insulation: Mineral Insulated With Compact Mgo, Sheath Material: Ss-316, Sheath Dia: 8Mm, Nipple: 1 / 2 Npt ( M ) 1 / 2 Sch80s, Ss-304 Ext.Length: 75Mm, Sheath Length: 190Mm Below Head , Rtd:- Element: Pt-100X2, Type: Duplex, 4 Wires, Head: Die Cast Alu. Weather Proof Ip-67, Terminal & Ceramic Block, Cable Entry: 01 No. , 1 / 2 Npt ( F ) , With Cable Gland, Standard: Cali: Iec 60751, Class-B Insulation: Mineral Insulated With Compact Mgo, Sheath Material: Ss-316, Sheath Dia: 12Mm, Nipple: 1 / 2 Npt ( M ) 1 / 2 Sch80s, Ss-304 Ext.Length: 75Mm, Sheath Length: 230Mm Below Head. , Rtd:- Element: Pt-100X2, Type: Duplex, 4 Wires, Head: Die Cast Alu. Weather Proof Ip-67, Terminal & Ceramic Block, Cable Entry: 01 No. , 1 / 2 Npt ( F ) , With Cable Gland, Standard: Cali: Iec 60751, Class-B Insulation: Mineral Insulated With Compact Mgo, Sheath Material: Ss-316, Sheath Dia: 10Mm, Nipple: 1 / 2 Npt ( M ) 1 / 2 Sch80s, Ss-304 Ext.Length: 75Mm, Sheath Length: 270Mm Below Head. , Rtd:- Element: Pt-100X2, Type: Duplex, 4 Wires, Head: Die Cast Alu. Weather Proof Ip-67, Terminal & Ceramic Block, Cable Entry: 01 No. , 1 / 2 Npt ( F ) , With Cable Gland, Standard: Cali: Iec 60751, Class-B Insulation: Mineral Insulated With Compact Mgo, Sheath Material: Ss-316, Sheath Dia: 10Mm, Nipple: 1 / 2 Npt ( M ) 1 / 2 Sch80s, Ss-304 Ext.Length: 75Mm, Sheath Length: 305Mm Below Head. , Rtd:- Element: Pt-100X2, Type: Duplex, 4 Wires, Head: Die Cast Alu. Weather Proof Ip-67, Terminal & Ceramic Block, Cable Entry: 01 No. , 1 / 2 Npt ( F ) , With Cable Gland, Standard: Cali: Iec 60751, Class-B Insulation: Mineral Insulated With Compact Mgo, Sheath Material: Ss-316, Sheath Dia: 12Mm, ( 16Mm Is N / A ) Nipple: 1 / 2 Npt ( M ) 1 / 2 Sch80s, Ss-304 Ext.Length: 75Mm, Sheath Length: 131Mm Below Head. , Rtd:- Element: Pt-100X2, Type: Duplex, 4 Wires, Head: Die Cast Alu. Weather Proof Ip-67, Terminal & Ceramic Block, Cable Entry: 01 No. , 1 / 2 Npt ( F ) , With Cable Gland, Standard: Cali: Iec 60751, Class-B Insulation: Mineral Insulated With Compact Mgo, Sheath Material: Ss-316, Sheath Dia: 12Mm, Nipple: 1 / 2 Npt ( M ) 1 / 2 Sch80s, Ss-304 Ext.Length: 75Mm, Sheath Length: 167Mm Below Head. , Rtd:- Element: Pt-100X2, Type: Duplex, 4 Wires, Head: Die Cast Alu. Weather Proof Ip-67, Terminal & Ceramic Block, Cable Entry: 01 No. , 1 / 2 Npt ( F ) , With Cable Gland, Standard: Cali: Iec 60751, Class-B Insulation: Mineral Insulated With Compact Mgo, Sheath Material: Ss-316, Sheath Dia: 12Mm, Nipple: 1 / 2 Npt ( M ) 1 / 2 Sch80s, Ss-304 Ext.Length: 75Mm, Sheath Length: 215Mm Below Head. , Rtd:- Element: Pt-100X2, Type: Duplex, 4 Wires, Head: Die Cast Alu. Weather Proof Ip-67, Terminal & Ceramic Block, Cable Entry: 01 No. , 1 / 2 Npt ( F ) , With Cable Gland, Standard: Cali: Iec 60751, Class-B Insulation: Mineral Insulated With Compact Mgo, Sheath Material: Ss-316, Sheath Dia: 12Mm, Nipple: 1 / 2 Npt ( M ) 1 / 2 Sch80s, Ss-304 Ext.Length: 75Mm, Sheath Length: 254Mm Below Head. , Rtd:- Element: Pt-100X2, Type: Duplex, 4 Wires, Head: Die Cast Alu. Weather Proof Ip-67, Terminal & Ceramic Block, Cable Entry: 01 No. , 1 / 2 Npt ( F ) , With Cable Gland, Standard: Cali: Iec 60751, Class-B Insulation: Mineral Insulated With Compact Mgo, Sheath Material: Ss-316, Sheath Dia: 12Mm, Nipple: 1 / 2 Npt ( M ) 1 / 2 Sch80s, Ss-304 Ext.Length: 200Mm, Sheath Length: 397Mm Below Head. , Multipoint Thermocouple:- Element: Cr / Al K Type ( 2 Nos. ) , Type: Duplex, Ungrounded, Head: Die Cast Aluminium, Ip-67 Terminal & Ceramic Block, Cable Entry: 1 / 2 Npt ( F ) With Cable Gland, Insulation: Mineral Insulated With Comp. Mgo, Standard: Cali: Ansi Mc 96.1, Class-1, Sheath Material: Ss-316, Sheath Dia: 3Mm, Process Conn: Ss Flange With Nut Bolt, 1 / 4 Npt ( M ) Adj. Comp. Fitting, Length L1: 432.2Mm, Length: L2: 499.5Mm. , Rtd With Cable: Element: Pt 100X1, Type: Simplex, 4 Wire, Cable: 4 Mtr. Long Ptfe Insulated Ss Braided Flexible Cable With Ss Tube ( Odxlength: 4X60mm ) , Standard: Cali: Iec 751 / Is:2848, Class-A Sheath Material: Ss-316, Sheath Dia: 3Mm, Sheath Length: 12Mm With Hard Crimping , Length L 690Mm Below Ss Tube. , Rtd With Cable: Element: Pt 100X1, Type: Simplex, 4 Wire, Cable: 4 Mtr. Long Ptfe Insulated Ss Braided Flexible Cable With Ss Tube ( Odxlength: 4X60mm ) , Standard: Cali: Iec 751 / Is:2848, Class-A Sheath Material: Ss-316, Sheath Dia: 3Mm, Sheath Length: 12Mm With Hard Crimping , Length L 200Mm Below Ss Tube. , Rtd With Cable: Element: Pt 100X1, Type: Simplex, 4 Wire, Cable: 4 Mtr. Long Ptfe Insulated Ss Braided Flexible Cable With Ss Tube ( Odxlength: 4X60mm ) , Standard: Cali: Iec 751 / Is:2848, Class-A Sheath Material: Ss-316, Sheath Dia: 3Mm, Sheath Length: 15Mm With Hard Crimping , Length L 80Mm Below Ss Tube. , Rtd With Cable ( Headless ) :- Element: Pt-100X2, Type: Duplex, 3 Wire, Cable: 3 Mtr Long Tef / Tef Insulated Ss Braided Flexible Cable Insulation: Mineral Insulated With Comp Mgo, Standard: Cali: Iec-60751, Class-A Sheath Material: Ss-316, Sheath Dia: 8Mm Sheath Length: 20Mm. , With Cable: Element: Pt 100X2, Type: Duplex, 3 Wire, Cable: 3 Mtr. Long Teflon / Teflon Insulated Ss Braided Flexible Cable, Insulation: Mineral Insulated With Comp. Mgo, Standard: Cali: Iec 751 Class-B Sheath Material: Ss-316, Sheath Dia: 3.2Mm ( + / -0.2Mm ) , Sheath Length: 20Mm With Crimping , Spring: Od: 3.5Mm, L: 120Mm. , Type : K Type Thermocouple, K Type Thermocouple Assy. Should Be Manufactured With Metallic Plate To Be Bolted / Riveted To Bottom Of Thermocouple Ceramic Head And That Metallic Plate Should Be Stamped To Tc Stem Mineral Insulated K Type Thermocouple ( Ungrounded Junction ) Measuring Range: 0-660 °C Additional Sample Testing At 900 °C Immersion Length Of Element Below Head: 400 Mm. Stem: To Be Provided With Adjustable M20 X 1.5 Coupling With Suitable Teflon Ferrule Inside Accuracy: ±3 / 8% Of Reading ( For 0-277 °C Accuracy Requirement Is ± 1.1 °C And For 277 To 1260 °C The Accuracy Requirement Is ±3 / 8% Of Reading. Tc Stem: 6 Mm Od Ss-304 Sheathing For Protection. Filling: Mgo / Alumina Measuring Junction Element Should Not Be Welded To Protection Tube. Mineral Insulation For Measuring Junction Leads Inside Protection Tube. Thermocouple To Be Provided With Porcelain Connector And Light Weight Metallic Head. Porcelain Insulated Terminal Block

Sr No	CorrigendumDate	Corrignedum	CorrigendumType	NewSubmissionDate
1	01-Aug-2023	first extension of due date	Date	16-08-2023
2	18-Aug-2023	second extension of due date	Date	31-08-2023
3	01-Sep-2023	third extension of due date	Date	15-09-2023

INR 1000 /-

INR 62200.0 /-

INR 31.08 Lakhs /-

Name of Work: Procurement of various temperature measurement instruments thermocouple’s and RTD’s installed at different auxiliaries & locations in BTG and BOP area at 2X600MW, SSTPP, MPPGCL, Dongalia.

Sl. No.	Item Description
1	FW Temp at ECO I/L
2	FW TEMP AT ECO outlet Left & Right
3	STM TEMP AT LTSH I/L HDR L & R
4	STM TEMP AT RH I/L HDR-L & R
5	HEATING STM TEMP AFT HOTCV
6	AFTER SBPRV TEMP
7	MS TEMP AT SH 0/L- L & R
8	HRH STM TEMP AT RH 0/L L & R
9	STM TEMP AT LTSH 0/L TEMP L&R
10	SH DIV PANELETTE 1/L TEMP – L&R
11	PLATEN SH I/L TEMP L&R
12	SH PLATEN 1/L HDR TEMP L&R
13	SEC. AIR TEMP. L&R
14	Primary Air Temp. atAH-O/L
15	Sec. Air Temp. AtAH- O/L
16	FG Temp at AH - I/L
17	Mixed air temp. beforeMILL
18	MILL O/L TEMP. (FOR FIRE PROTECTION)
19	FG "TEMP AT AH 0/L
20	FG "TEMP AT ID FAN I/L
21	RTD PT 100 Location: FD Fan Bearing RTD CONFIGURATION : HEAD LESS ASSEMBLY ELEMENT TYPE : RTD PT 100 NO OF ELEMENT : Duplex NO OF LEADS : 3+3 wire
22	RTD RTD PT 100 Location: PA Fan Bearing RTD CONFIGURATION : HEAD LESS ASSEMBLY ELEMENT TYPE : RTD PT 100 NO OF ELEMENT : Duplex NO OF LEADS : 3+3 wire
23	RTD PT 100 CONFIGURATION : HEAD TYPE ASSEMBLY ELEMENT TYPE : RTD PT 100 LOCATION: Bearing NO OF ELEMENT : Duplex
24	RTD PT 100 RTD PT 100 BHEL PART NO.: 962561900000 CONFIGURATION : HEAD LESS ASSEMBLY ELEMENT TYPE : RTD PT 100 NO OF ELEMENT : Duplex NO OF LEADS : 3+3 wire
25	"THERMOCOUPLE" CONFIGURATION : HEAD TYPE ASSEMBLY ELEMENT TYPE : K TYPE THERMOCOUPLE LOCATION: BCW boiler NO OF ELEMENT : Duplex CALIBRATION STANDARD: As per IEC 60584
26	"THERMOCOUPLE" CONFIGURATION : HEAD TYPE ASSEMBLY ELEMENT TYPE : K TYPE THERMOCOUPLE LOCATION: BCW boiler NO OF ELEMENT : Duplex CALIBRATION STANDARD: As per IEC 60584 ACCURACY CLASS : Class II
27	RTD PT 100 CONFIGURATION : HEAD TYPE ASSEMBLY ELEMENT TYPE : RTD PT 100 LOCATION: Mill Thrust Pad bearing NO OF ELEMENT : Duplex CALIBRATION STANDARD: As per IEC 60751 ACCURACY CLASS : Class B
28	RTD PT 100 CONFIGURATION : HEAD TYPE ASSEMBLY ELEMENT TYPE : RTD PT 100 LOCATION: Mill Shaft NO OF ELEMENT : Duplex CALIBRATION STANDARD: As per IEC 60751 ACCURACY CLASS : Class B
29	Rtd:- Element: Pt-100x2, Type: Duplex, 4 Wires, Head: Die Cast Alu. Weather Proof Ip-67, Terminal & Ceramic Block, Cable Entry: 01 No. ,1/2" Npt (F), with Cable Gland, Standard: Cali: IEC 60751, Class-B Insulation: Mineral Insulated With Compact Mgo, Sheath Material: Ss-316, Sheath Dia: 8mm, Nipple: 1/2" Npt(M)1/2" Sch80s,Ss-304 Ext.Length: 75mm, Sheath Length: 190mm Below Head
30	Rtd:- Element: Pt-100x2, Type: Duplex, 4 Wires, Head: Die Cast Alu. Weather Proof Ip-67, Terminal & Ceramic Block, Cable Entry: 01 No. ,1/2" Npt (F), with Cable Gland, Standard: Cali: IEC 60751, Class-B Insulation: Mineral Insulated With Compact Mgo, Sheath Material: Ss-316, Sheath Dia: 12mm, Nipple: 1/2" Npt(M)1/2" Sch80s,Ss-304 Ext.Length: 75mm, Sheath Length: 230mm Below Head.
31	Rtd:- Element: Pt-100x2, Type: Duplex, 4 Wires, Head: Die Cast Alu. Weather Proof Ip-67, Terminal & Ceramic Block, Cable Entry: 01 No. ,1/2" Npt (F), with Cable Gland, Standard: Cali: IEC 60751, Class-B Insulation: Mineral Insulated With Compact Mgo, Sheath Material: Ss-316, Sheath Dia: 10mm, Nipple: 1/2" Npt(M)1/2" Sch80s,Ss-304 Ext.Length: 75mm, Sheath Length: 270mm Below Head.
32	Rtd:- Element: Pt-100x2, Type: Duplex, 4 Wires, Head: Die Cast Alu. Weather Proof Ip-67, Terminal & Ceramic Block, Cable Entry: 01 No. ,1/2" Npt (F), with Cable Gland, Standard: Cali: IEC 60751, Class-B Insulation: Mineral Insulated With Compact Mgo, Sheath Material: Ss-316, Sheath Dia: 10mm, Nipple: 1/2" Npt(M)1/2" Sch80s,Ss-304 Ext.Length: 75mm, Sheath Length: 305mm Below Head.
33	Rtd:- Element: Pt-100x2, Type: Duplex, 4 Wires, Head: Die Cast Alu. Weather Proof Ip-67, Terminal & Ceramic Block, Cable Entry: 01 No. ,1/2" Npt (F), with Cable Gland, Standard: Cali: IEC 60751, Class-B Insulation: Mineral Insulated With Compact Mgo, Sheath Material: Ss-316, Sheath Dia: 12mm, (16mm is N/A) Nipple: 1/2" Npt(M)1/2" Sch80s,Ss-304 Ext.Length: 75mm, Sheath Length: 131mm Below Head.
34	Rtd:- Element: Pt-100x2, Type: Duplex, 4 Wires, Head: Die Cast Alu. Weather Proof Ip-67, Terminal & Ceramic Block, Cable Entry: 01 No. ,1/2" Npt (F), with Cable Gland, Standard: Cali: IEC 60751, Class-B Insulation: Mineral Insulated With Compact Mgo, Sheath Material: Ss-316, Sheath Dia: 12mm, Nipple: 1/2" Npt(M)1/2" Sch80s,Ss-304 Ext.Length: 75mm, Sheath Length: 167mm Below Head.
35	Rtd:- Element: Pt-100x2, Type: Duplex, 4 Wires, Head: Die Cast Alu. Weather Proof Ip-67, Terminal & Ceramic Block, Cable Entry: 01 No. ,1/2" Npt (F), with Cable Gland, Standard: Cali: IEC 60751, Class-B Insulation: Mineral Insulated With Compact Mgo, Sheath Material: Ss-316, Sheath Dia: 12mm, Nipple: 1/2" Npt(M)1/2" Sch80s,Ss-304 Ext.Length: 75mm, Sheath Length: 215mm Below Head.
36	Rtd:- Element: Pt-100x2, Type: Duplex, 4 Wires, Head: Die Cast Alu. Weather Proof Ip-67, Terminal & Ceramic Block, Cable Entry: 01 No. ,1/2" Npt (F), with Cable Gland, Standard: Cali: IEC 60751, Class-B Insulation: Mineral Insulated With Compact Mgo, Sheath Material: Ss-316, Sheath Dia: 12mm, Nipple: 1/2" Npt(M)1/2" Sch80s,Ss-304 Ext.Length: 75mm, Sheath Length: 254mm Below Head.
37	Rtd:- Element: Pt-100x2, Type: Duplex, 4 Wires, Head: Die Cast Alu. Weather Proof Ip-67, Terminal & Ceramic Block, Cable Entry: 01 No. ,1/2" Npt (F), with Cable Gland, Standard: Cali: IEC 60751, Class-B Insulation: Mineral Insulated With Compact Mgo, Sheath Material: Ss-316, Sheath Dia: 12mm, Nipple: 1/2" Npt(M)1/2" Sch80s,Ss-304 Ext.Length: 200mm, Sheath Length: 397mm Below Head.
38	MULTIPOINT THERMOCOUPLE:- ELEMENT: CR/AL "K" TYPE (2 NOS.), TYPE: DUPLEX, UNGROUNDED, HEAD: DIE CAST ALUMINIUM, IP-67 TERMINAL & CERAMIC BLOCK, CABLE ENTRY: 1/2" NPT(F) WITH CABLE GLAND, INSULATION: MINERAL INSULATED WITH COMP. MGO, STANDARD: CALI: ANSI MC 96.1, CLASS-1, SHEATH MATERIAL: SS-316, SHEATH DIA: 3MM, PROCESS CONN: SS FLANGE WITH NUT BOLT, 1/4" Npt(m) Adj. Comp. Fitting, LENGTH "L1": 432.2MM, LENGTH: "L2": 499.5MM.
39	Rtd With Cable: Element: Pt 100x1, Type: Simplex, 4 Wire, Cable: 4 Mtr. Long Ptfe Insulated Ss Braided Flexible Cable With Ss Tube (ODXLENGTH: 4x60mm), Standard: Cali: Iec 751/Is:2848, Class-A Sheath Material: Ss-316, Sheath Dia: 3mm, Sheath Length: 12mm with Hard Crimping , Length "L" 690mm Below Ss Tube.
40	Rtd With Cable: Element: Pt 100x1, Type: Simplex, 4 Wire, Cable: 4 Mtr. Long Ptfe Insulated Ss Braided Flexible Cable With Ss Tube (ODXLENGTH: 4x60mm), Standard: Cali: Iec 751/Is:2848, Class-A Sheath Material: Ss-316, Sheath Dia: 3mm, Sheath Length: 12mm with Hard Crimping , Length "L" 200mm Below Ss Tube.
41	Rtd With Cable: Element: Pt 100x1, Type: Simplex, 4 Wire, Cable: 4 Mtr. Long Ptfe Insulated Ss Braided Flexible Cable With Ss Tube (ODXLENGTH: 4x60mm), Standard: Cali: Iec 751/Is:2848, Class-A Sheath Material: Ss-316, Sheath Dia: 3mm, Sheath Length: 15mm with Hard Crimping , Length "L" 80mm Below Ss Tube.
42	Rtd With Cable (HEADLESS):- Element: Pt-100x2, Type: Duplex, 3 Wire, Cable: 3 Mtr Long Tef/Tef Insulated Ss Braided Flexible Cable Insulation: Mineral Insulated With Comp Mgo, Standard: Cali: IEC-60751, Class-A Sheath Material: Ss-316, Sheath Dia: 8mm Sheath Length: 20mm.
43	With Cable: Element: Pt 100x2, Type: Duplex, 3 Wire, Cable: 3 Mtr. Long Teflon/Teflon Insulated Ss Braided Flexible Cable, INSULATION: MINERAL INSULATED WITH COMP. MGO, Standard: Cali: IEC 751 Class-B Sheath Material: Ss-316, Sheath Dia: 3.2mm (+/-0.2mm), Sheath Length: 20mm with Crimping , Spring: OD: 3.5mm, L: 120mm.
44	Type : K Type Thermocouple, K type thermocouple assy. should be manufactured with metallic plate to be bolted /riveted to bottom of thermocouple ceramic head and that metallic plate should be stamped to TC stem Mineral insulated k type thermocouple (ungrounded junction) Measuring range: 0-660 °C Additional sample Testing at 900 °C Immersion length of element below head: 400 mm. Stem: to be provided with adjustable M20 x 1.5 coupling with suitable Teflon ferrule inside Accuracy: ±3/8% of reading (for 0-277 °C accuracy requirement is ± 1.1 °C and for 277 to 1260 °C the accuracy requirement is ±3/8% of reading. TC stem: 6 mm OD SS-304 sheathing for protection. Filling: MgO/Alumina Measuring junction element should not be welded to protection tube. Mineral insulation for measuring junction leads inside protection tube. Thermocouple to be provided with porcelain connector and light weight metallic head. Porcelain insulated terminal block