This flat platinum resistance detector represents the latest development by NEWPORT in miniaturization of temperature sensing devices. It combines the precision temperature measuring capability of the platinum resistance detector with the small temperature sensing tip and rapid response time of the thermocouple.

An immediate field of application for the TFD is in the area of surface temperature measurement. If required, the TFD can be supplied in a moisture-proof encapsulation, and the leads can also be protected from moisture with silicone rubber. Order No. TFD-EN.

Rapid response times are achieved with the TFD because..
– it possesses a large surface-area- to-volume ratio; and
– the temperature-sensitive platinum layer is separated from the medium to be measured by a thin ceramic substrate of high thermal conductivity.

This is of particular interest for temperature measurement in gaseous media, such as in wind tunnels and air conditioners. The TFD is also an extremely vibration-resistant device. The resistance values and tolerances comply with DIN 43760 and BS 1904 (Pt100 ohm).

Response Time in water moving at 0.4 m/sec
t(50%) = 0.25 sec
t(90%) = 1.1 sec

Response Time in air moving at 1m/sec
t(50%) = 13.5 sec
t(90%) = 55 sec.

Specifications
Element: TFD, TFD-EN for moisture-proof capsulation Design Glass-encapsulated platinum layer on a ceramic substrate
Leads: Platinum wire 0.25 mm dia, about 20 mm long, on a narrow side
Temperature Range: -50 to 550°C (-60 to 1020°F) (TFD-EN to 125°C (255°F))
Insulative resistance at 500°C (930°F): >108 ohm
Voltage Necessary for Destruction: 100 Vdc
Hysteresis Error (observed only after rapid temperature cycling): Max. 0.25 ohm
Self-heating error at 20°C (70°F): in still air 1.9 mW/°C in still water 75 mW/°C To Order (Specify Model Number)

*Provided with 24-inch, 2-wire lead.