Ni120 – Resistance

Ni120 are components for measuring the temperature on a nickel basis. The resistance changes depending on the temperature. At 0 °C the resistance is 120 ohms.

The resistance develops almost linearly to the measured temperature. Nickel resistances can be calculated in the range from -60 °C to 250 °C according to DIN 43760 using the Callendar–Van Dusen equation.

Ni120 have a more pronounced change in resistance than resistance thermometers made from alloys. For example, nickel is more sensitive than platinum.

The limit deviation in the range below 0 °C is slightly larger than with Pt resistors.

Ni120 Construction

Nickel resistors are almost always provided with insulated cables - at temperatures below 250 °C, usually made of PVC, silicone rubber or PTFE. The measuring parts require a housing or sheathing made of a metal alloy that does not react with the environment to be measured.

 

Terms from the illustration:

  • Resistance thermometer
  • Connection to power lines
  • Connection lead/wire
  • Sheathing
  • Insulation