Glass-encapsulated thermistors are stable for automotive use

Hermetically-sealed, glass-encapsulated thermistors in the DG series provide long-term stability and reliability for high-accuracy temperature sensing in automotive and industrial applications, claims Ametherm. According to the company, they eliminate errors in resistance readings due to moisture penetration while offering high operating temperatures and a compact size.

The thermistors are faster, more accurate, and less expensive alternatives to thermocouples and RTD probes. They are free from limitations due to solder temperature, which enables them to offer users a wide operating temperature range of -55 to +200 degree C, says the company. The diameter of only 1.5mm allows for encapsulation in a variety of housings, such as ring lugs and hex nuts.

Four resistance values are offered at 25 degree C of 10, 40, 50, and 100kOhm, with tolerances down to ± two per cent, a dissipation constant of 3.0mW/degree C, and thermal time constant of 6s. The devices provide TCRs of -3.9 per cent/degree C, -4.40 per cent/degree C, and -4.75 per cent/degree C; beta values of 3500, 3950, and 4200 degree K; and 32 AWG dumet wire leads.

The thermistors are available direct or through distributors such as Digi-Key and Mouser.


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