Gost 22666-77. Copper and kopel alloy wire for low-temperature thermocouples. Technical conditions.

Gost 1790-77
GOST 22666-77
GOST 1791-67
Tu 48-21-686-80
Tu 48-21-172-72
Tu 48-21-128-72
GOST 5307-77
GOST 5189-75
GOST 1173-93
Gost 495-92
GOST 546-2001

Technical characteristics

The wire is made in accordance with the requirements" of this standard according to the technological regulations approved in the prescribed manner, of copper grades not less than M1E

Thermal conductivity

According to GOST 2266-77 thermo-electromotive force developed by kopel wire paired with copper in the temperature range from minus 200 to plus 100 ° C, must comply with the values given in the table below

Temperature Value Thermo-EFM
-196°С -6.084±0.060 mV
-196°С -6,084±0,027 mV High accuracy thermocouple
-78°G -2,998±0,060 mV
-78°G -2,998±0,046 mV High-accuracy thermocouple
+100°С +4,721±0,060 mV

TEMF parameters

According to GOST 2266-77 on any length of 100 m at boiling point of liquid nitrogen thermoelectric emf must not exceed

for kopel wire - 15 μV;

copper wire - 5 μV;

Quality

The wire surface should be clean, smooth, without films, cracks, delaminations, burrs, rolls, dents, scratches, marks. In accordance with GOST 22666-77, some surface defects are allowed, which are within the limiting diameter deviation during control sweeping.

Delivery

According to GOST 22666-77 wire is produced in annealed (soft) condition with light surface. The surface may have discoloration colors. The wire on a reel shall consist of a single segment with no bridges, twists or knots.


Diameter, mm
 Weight of wire on a spool, kg
not less
 not more
0,2
0,3
0,4
0,5		 0,15
0,25
0,30
0,50		 3,5
3,5
3,5
3,5

Mechanical properties

Mechanical properties of the wire at a temperature of 20±± 5°С shall be as specified below.

Material designation Diameter, mm Tensile breaking strength Â, MPa (kgf/mm2), not less Relative elongation d, %, min
Kopel 0,2
0,3
0,4
0,5		 390 (40) 15
15
15
20
Copper 0,2
0,3
0,4
0,5		 200 (20) 20
20
20
20

Specific electrical resistance

The specific electrical resistance of kopel at (20±5)°C shall be:(0.47±0.05)x10-6 Ohm;

Supplier

Supplier Evek GmbH offers to buy thermocouple wire, the price is the best in this segment of rolled products. We offer to buy a thermocouple wire, from the specialized warehouses of the company Evek GmbH with delivery in any city. Full compliance with GOST 22666-77. Supplier Evek GmbH invites you to partner cooperation.

Buy, bargain price

Supplier offers to buy thermocouple wire, price - due to technological features of production without including additional costs. On the website of the supplier Evek GmbH information about the latest arrivals of products. We have the best price-quality ratio for thermocouple wire. Timely delivery is ensured by representatives in Eastern European cities. Supplier Evek GmbH offers today to buy thermocouple wire, the price is optimal from the supplier.