Micro differential pressure transmitter -1151DR type

The 1151DR micro differential pressure transmitter has a wide variety, which can accurately measure micro differential pressure to large differential pressure, low pressure to high pressure, liquid level, vacuum degree, and specific gravity. Combined with a throttling device, flow can also be measured without using a square root.

Flange type liquid level transmitter, with flat flange and plug-in flange; There are four combinations available for installing flanges: 3 # and 4 #, 150 # (working pressure of 1.89Mpa), and 300 # (working pressure of 4.95Mpa) for users to choose from. In addition to 316 stainless steel, there are also Hastelloy, Monel, and Tantalum materials that can be used in corrosive media.

Using a metal sealed delta chamber as the sensing element, the transmitter eliminates the problems of impact resistance and vibration difference when transmitting force mechanically; Eliminate errors caused by external stress and torque, ensure high stability performance of the transmitter, and reduce errors caused by static pressure (13.79Mpa~31.0Mpa); Due to the use of approximately the same external dimensions of the delta chamber for each variety, the entire 1151 series has approximately the same appearance and weight, ranging from the micro differential pressure type measuring 0.12Mpa to the pressure type measuring 41.37Mpa.

The 1151 transmitter is exquisitely designed with explosion-proof and all-weather structure. Installation, use, and calibration are all very convenient and simple. The wiring terminals and amplification circuits are placed in a sealable electrical chamber at the top, and are separated from each other. So when wiring on site, the amplifier is still working in a sealed state. The amplification circuit has reverse polarity protection to prevent damage to the transmitter due to misconnection. The volume change during operation of 1151 is less than 0.16 milliliters, which can prevent excessive changes in the liquid column of the measured medium. Therefore, there is no need to add a condenser or liquid level cylinder to compensate for the volume change. Using corrosion-resistant materials such as tantalum, Hastelloy, and Monel alloys to adapt to the measurement of corrosive media. By using integrated circuit components and plug-in printed circuit boards, there are fewer faults, easier maintenance, reduced spare parts, and lower maintenance costs.

working principle

The pressure of the measured medium is transmitted to the central measuring diaphragm through the isolation diaphragm of the δ chamber (LT and DP/GP remote transmitters with 1199 are used to transmit the measured pressure first through an isolation diaphragm and a fully sealed capillary system filled with silicone oil or fluorine oil before being transmitted to the isolation diaphragm of the δ chamber) and the filling oil in it. Except for the AP type absolute pressure transmitter, which measures the absolute vacuum reference point on the other side of the diaphragm, other types of measuring diaphragms have either atmospheric pressure or the low-pressure side of the measured differential pressure. The measuring diaphragm is a pre tensioned elastic element, whose displacement is proportional to the pressure of the measured medium, with a maximum displacement of only 0.10mm. The position of the measuring diaphragm is detected by the capacitor fixed plates on both sides. The differential capacitance between the measuring membrane and the fixed plates of the two capacitors is linearly converted into a two-wire current signal of 4-20mADC by the amplification circuit.