Please help me list the equipment needed to calibrate these instruments

Piston pressure gauges and standard meters. 0～1.5MPa, 0～1.6MPa, 0～2.5MPa, Class 0.5. 0–130 kPa pressure gauge. Signal generators for pneumatic control valves, and specialized calibrators for thermistor bimetallic thermometers.

The pressure gauge has measurement ranges of 0~1.6 MPa, 0~1.0 MPa, and 0~2.5 MPa. (Precision pressure gauges required: what level of accuracy and range is needed?) Standard gauges have measurement ranges of 0~2.5 MPa, 0~2.0 MPa, and 0~4.0 MPa. The accuracy of the standard gauge needs to be 1/3 of the accuracy of the gauge being calibrated. The piston pressure gauge can be used to calibrate smart pressure transmitters. Measurement ranges: 0～130 kPa, 0～1.5 MPa, 0～1.6 MPa, 0～2.5 MPa. FLUK744 can verify standard tables; measurement ranges: 0~200kPa, 0~2.0MPa, 0~2.5MPa, 0~4.0MPa. The accuracy of the standard table need only be 1/3 of the accuracy of the table being calibrated. Pneumatic control valve: Requires a gas source signal, a positioner, a multimeter, and a signal generator. Thermal resistor: Calibration is carried out using FLUK744 or a resistance box. Last edited by 13897295006 on 2009-2-6 12:22.]

Precision pressure gauges should use a 0.25 grade.

General-purpose pressure gauges are of class 1.6; a standard pressure gauge of class 0.4 should be sufficient for use.

The fourth floor explained it in great detail, thank you!

Additional information: Pressure gauge: In addition to using a piston-type pressure calibration bench, pressure can also be applied using a manual pump, with calibration carried out using standard weights, standard pressure gauges, or digital pressure meters. Control valve: For small air compressors, the pressure is 0.6 Mpa (equipped with a filter-pressure reducing valve); for pneumatic regulators, the range is 0–0.1 Mpa, with a precision of 0.5 grade

Calibrating pressure gauges requires standard pressure gauges of class 0.4 at 2.5 MPa and 4.0 MPa, that is, piston pressure gauges. The calibration of intelligent pressure transmitters requires a pressure pump, a digital standard pressure gauge, or alternatively a pressure calibration bench. Calibrating a pneumatic control valve requires: if it is a pneumatic valve, a pneumatic positioner or a standard pressure gauge is needed ； If it is an electrical valve positioner, a current signal generator or a current signal calibrator is required. The calibration stations for thermoresistors and bimetallic thermometers are relatively expensive, costing around 70,000 to 150,000 yuan.

The accuracy of the standard precision pressure gauge used to calibrate the pressure gauge should be less than one-third of the accuracy of the gauge being calibrated. For smart pressure transmitters operating at low pressures, a multi-functional calibration bench is sufficient; for those working at high pressures, a pressure pump is required. If the transmitter uses the HART protocol, an HRTA is also needed. To test control valves, a pressure reducing valve, a setpoint regulator, and a precision pressure gauge are required; if a valve positioner is used, a signal generator is also necessary. Calibrating thermal resistors requires specialized equipment.

Thermistors and bimetallic thermometers need to be calibrated using a heating furnace and a standard thermometer; in addition, the insulation resistance of thermistors must also be measured with a megohmmeter.

Thermoresistors and bimetallic thermometers require calibration using a dry well heater.