This flat Platinum resistance detector represents NEWPORT’s latest development in miniature temperature sensing devices. It combines the precision 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 surface
temperature measurement.

The TFD achieves rapid response times because:
1) It has a high ratio of surface area to volume
2) 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 to users measuring temperature in gaseous environments, such as wind tunnels and air conditioners. The TFD is also extremely vibration-resistant.

The resistance values and tolerances comply with DIN 43760 and BS 1904 ratings (Pt100 Ω).
The TFD element is supplied in an encapsulated sensor screw-mounted brass housing with PFA insulated leads. Two-, 3- or 4- wire configuration is available. Sensor design provides cost effective, fast response and easy mounting on flat surfaces. The maximum temperature of the probe assembly is 260°C (500°F). Termination options are available for easy operation in conjunction with NEWPORT meters or other instruments.

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 1 m/sec
t(50%) = 13.5 sec
t(90%) = 55 sec.

Specifications
Element: TFD-design glassencapsulated Platinum layer on a ceramic substrate
Leads: Platinum wire 0.2 mm dia, about 10 mm long
Temperature Range: -70 to 500°C (-95 to 930°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): 1.9 mW/°C in still air; 75 mW/°C in still water