The principal characteristics of the most common sensors are indicated on the following pages. These sensors are in stock and can be delivered within our normal lead times. In addition to these, we can install many other types of temperature sensors in most of the standard probe configurations.
Those sensors listed below as PT100 or PT1000 are platinum film based, while the others are wirewound platinum. Differences in performance are indicated in the Technical Notes Section. We offer sensors with two alpha characteristics- .00385, which complies with DIN 43760 and IEC 751- and .00392. This second characteristic is based on high purity platinum wire, in as nearly strain-free condition as is practical in a commercial quality sensor. The table lists part numbers and accuracies of our standard sensors.
|MP Matched Pair|
|Matching of a pair of P tolerance sensors within .05°C at any specified temperature between 0 and 125°C, or within .1°C at any specified temperature above this range to a maximum temperature of 420°C. Requires PSN probe option and bath setup charges for temperatures other than 0 or 100°C. Specify in probe part number. Example, -MP,75°C.|
Selection of a P tolerance sensor, or group of sensors, to nominal value ± 0.05°C at any specified temperature between 0 and 100°C. Requirements similar to MP. Example, -S, 75°C.
Our wire conforms to standard limits of accuracy and is of duplex construction, #20 or #24AWG solid, insulated and temperature rated as indicated in the appropriate probe categories.
The G and U in the part numbers indicate grounded or ungrounded construction. We can offer wire with calibrations not listed, or with special limits of accuracy.
We maintain a small stock of thermistors manufactured by YSI, Incorporated, BetaTherm, and others. Because of the great variety available, we purchase most items as we need them. If you have a requirement for a particular manufacturer's product, give us a call.
Platinum Sensor Data
These tables provide resistance vs. temperature data on the ITS90 for all our standard platinum sensors. The set of ITS-90 coefficients below will recreate the tables within about ± 0.01°C. A form of the Callendar-Van Dusen equation with coefficients which will recreate the tables within about ± 0.1°C is also shown.
Callendar Van-Dusen Coefficients
A, B, and C are coefficients in the equation of the form R=R0 [ 1 + At + Bt 2 + [ C (t-100) t 3 ] ] . t is temperature in degrees Celsius. For temperature ranges which do not extend below 0°C, the equation becomes R=R0 (1 + At + Bt 2 ).
A, B, and C are derived using the following equations.
A= Alpha x 1+(Delta x10-2)
B= -Alpha x Delta x10-4
C= -Alpha x Beta x10-8
These are coefficients for low sub-range 4
(83.8058K to 273.16K) and high sub-range 7
(273.15K to 933.473K).