Support & FAQ

Our T24/T23 adopt above 3 different materials depending on their characteristic usage.
-Bakelite (Phenol-Formaldehyde -PF)
Temperarure endurance (up to 175 C)
Normally used in USA certificate thermostat item.
-PPS
PPS owns more better temperarure endurance (up to 220 C) and insulation effect.
Normally used in European certificate thermostat items.
-Ceramic
We adopt the same quality of Wako,TI material.
Its essence is superior than above two.

The three series are all with the same function and usage in a mode of heat reaction.

• The body of T36 series are ceramic material which can endure higher environment
  temperature.
• T36 ceramic is becoming main stream in the sales of heat reaction products.

T24 series is a thermostat using the bimetal to control its temperature. The interior is the low electric resistance circuit with silver-plated contact. With its constant temperature controlled design as well as small shape, T24 series can be widely applied to small home appliances like water dispenser, microwave, space heater, oven, coffee maker, electric blanket, heating pad, and so on.

The materials to be used in our T24 series and T23 series are mainly ceramic, PPS, and Bakelite.
Bakelite is generally to be applied to USA standard products, using the raw material with a material number of ”PMC-T375J”.

PPS is mostly to be applied to European standard products which is with higher heat endurance and isolated impedance, using the raw material with a material number of ”Ryton R-7”.

Ceramic is using the raw material paralleled to international manufacturers such as WAKO, TI, and so on.
It is superior to another two plastic in terms of electric property. It depends on customer special requirements for their working environment temperature as well as electric property to determine if it is appropriate to use this material.

Both series are all with the same function and usage in a mode of heat reaction, only different in the shape,dimension, and interior structure. The two big differences between the both are as set forth below:

1. Interior structure: T23 is of double-armed; T24 is of single-armed suspension.
2. The body of T24 series is approx 2.8mm higher than T23; T24 is 12.4mm high, T23 is 9.6mm high. It alldepends on the design of interior structure for user to choice T24 or smaller size T23.

This is a protective device designed for particular protection purpose. It will not come back to action function when it comes tothe set temperature, only when replaced by another unit or descended to 35℃ (-31℉) below that can return to action function.(nobutton with it usually.)

It stands for the numerical difference between action temperature and reset temperature. The general differential for T23 series and T24 series is in the range of 15℃~20℃; and for T26 series and T27 series is in the range of 30℃~50℃.

TRS is also called Magnet sensitive temperature switch

Working principle:
TRS is to make use of ferrite soft magnet temperature sensitive material and hard magnet material as well as dry reed pipe. It is a new type temperature sensor made based on the principle that ferrite soft magnet material will lose magnet near curie temperature, make the flux passing through dry reed pipe change remarkably so as to make the dry reed pipe connect or close. It has advantages of accurate action temperature, less temperature difference for action resumption, high speed, long service life and explosion resistance etc., thus it is widely used in temperature control and super-temperature protection of electric rice cooker, electric water heating, electric vacuum flask, electric shower, refrigerator, air conditioner and other products as well as cold starting, hot starting and water temperature control of automobile and overheat protection of power supply and machinery equipment.

The action temperature (-40℃～130℃）can be chosen freely and the action temperature accuracy is ±１℃, ±２℃ and ±2.5℃.

“One Shot” is a single pole, single throw, snapacting,non-adjustable thermostat designed as a high limit device for applications where automatically resettable thermostats are not desirable.

A temperature-sensitive bimetal disc, electrically and thermally isolated from the switch, is used to actuate the normally-closed contacts.

Contacts open when surface or ambient temperatures increase to the operating set point of the calibrated bimetal disc. The entire switch is enclosed in a housing; the bimetal disc is retained by a metal heat-conducting end cap.

The circuit remains open above the room ambient temperature and will reset below -35 °C [-31 °F]. For increased sensitivity, an exposed disc may be specified. A variety of mounting brackets and terminals is available.

The capillary thermostat operates on the principle of fluid expansion. A temperature change in a fluid filled sensing system consisting of probe (also called bulb), capillary and diaphragm capsule, produces a volume change. The resulting movement of the diaphragm acts through a mechanism to operate the micro switch. i.e a single pole, single throw normally closed circuit breaks (opens) on rise of temperature.

The Thermal Time Constant is a measurement of the time required for the
thermistor to respond to a change in the ambient temperature. The technical
definition of Thermal Time Constant is, “The time required for a thermistor to
change 63.2% of the total difference between its initial and final body
temperature when subjected to a step function change in temperature, under
zero power conditions”.

The thermal time constant is affected by the medium in which the test is
performed. For example, the thermal time constant will be shorter in moving air
than in still air and shorter in moving water than in still water.

The most common method used for measuring the thermal time constant of a
thermistor is by placing the device in still air at room temperature. Adequate
power is then applied to raise the thermistors body temperature well above that
of the ambient. The power is maintained until thermal stabilization at the
elevated temperature, is achieved. Then, the power is removed from the
thermistor and simultaneously, a timer is triggered. The resistance of the
thermistor is continuously monitored and when it indicates that the thermistor
body has cooled to the temperature which represents 63.2% of the temperature
difference between the elevated temperature and that of the ambient
temperature, the timer is stopped. The time indicated represents one time
constant and is usually expressed in “seconds”.

Although this is the most common method for measuring the thermal time
constant of thermistors and thermistor probe assemblies, it is not always the
best method to use for all applications. For example, if a thermistor probe
assembly is designed to be used for temperature control of a fluid, it will
usually be best to measure the thermal time constant using a step change in
fluid temperature rather than using the “Self Heating” method in still air.

Generally speaking, the larger the physical size of the thermistor or thermistor
probe assembly, the longer the thermal response time will be. However, other
factors, such as thermal conductivity, thermal mass, surface area to mass ratio
and stem conduction of lead wires etc., can affect the thermal time constant
significantly.

Source: U.S. Sensor Corp. www.ussensor.com