Abstract: An automatic operation method for setting temperature compensation coefficients of a digital pressure gauge is revealed. Primarily, a microcontroller unit (MCU) in the pressure gauge is equipped with built-in calibration procedures. The gauge is placed into a temperature-controlled chamber in order to obtain the temperature coefficient of offset (Tco) and temperature coefficient of span (Tcs). This method is the automatic measuring outputs of zero pressure/full scale at two temperatures to calculate the temperature coefficients Tco/Tcs. The two temperature compensation coefficients are stored in the MCU inside the pressure gauge. As the pressure gauge operates in any working temperature environments, the gauge based on a certain algorithm formula with the two stored temperature coefficients shows an accurate pressure reading.

Abstract: An automatic operation method for setting temperature compensation coefficients of a digital pressure gauge is revealed. Primarily, a microcontroller unit (MCU) in the pressure gauge is equipped with built-in calibration procedures. The gauge is placed into a temperature-controlled chamber in order to obtain the temperature coefficient of offset (Tco) and temperature coefficient of span (Tcs). This method is the automatic measuring outputs of zero pressure/full scale at two temperatures to calculate the temperature coefficients Tco/Tcs. The two temperature compensation coefficients are stored in the MCU inside the pressure gauge. As the pressure gauge operates in any working temperature environments, the gauge based on a certain algorithm formula with the two stored temperature coefficients shows an accurate pressure reading.

Abstract: A digital pressure meter is equipped with an operational (OP) amplifier circuit, and a thermistor circuit is connected with the OP amplifier circuit for causing change of an amplification ratio of the OP amplifier circuit with such that a temperature compensation for output signals is effected; the thermistor circuit includes thermistors with positive temperature coefficient or ones with negative temperature coefficient; with the help of the thermistor circuit, the digital pressure meter can perform a measurement with an accuracy of ±1% FSO (full scale output) within the working temperature range.

Abstract: A digital pressure meter is equipped with an operational (OP) amplifier circuit, and a thermistor circuit is connected with the OP amplifier circuit for causing change of an amplification ratio of the OP amplifier circuit with such that a temperature compensation for output signals is effected; the thermistor circuit includes thermistors with positive temperature coefficient or ones with negative temperature coefficient; with the help of the thermistor circuit, the digital pressure meter can perform a measurement with an accuracy of ±1% FSO (full scale output) within the working temperature range.

Abstract: A chiral smectic liquid crystalline polymer having the following formula is disclosed: ##STR1## wherein m is an integer of about 40-80; n is an integer of about 1-12;R is ethylene or trimethylene;R' is methylene or oxyethylene;Ar is phenylene, chlorophenylene or ##STR2## wherein x is chlorine or hydrogen; and Ar' is phenylene or phenylenecarbonyl.

Abstract: A side-chain liquid crystalline polysiloxane having the following formula is disclosed: ##STR1## wherein Me is methyl; m is an integer of 40 to 80; n is an integer of 1 to 12; Ar is phenylene, biphenylene or naphthalene; Ar' is phenylene or naphthalene; X is halogen or methyl; and R is C.sub.1 -C.sub.4 alkyl.