1. Product overview

   apsl801 pneumatic full-automatic piston pressure gauge is a product designed and developed by our company with advanced anti-wear patent. It is fully automatic to load weights and pressurize. In the verification process, wear prevention can be achieved at any time to ensure that the maximum error of the piston system in a verification cycle does not exceed the allowable error. The system includes the function of full-automatic pressure calibration table, which has the functions of sending 24V power supply, measuring real-time pressure, input current, input voltage, piston position, weight rotation speed, piston head temperature, humidity and so on. It can fully calibrate pressure transmitters, digital pressure gauges, precision pressure gauges and so on, and automatically set the verification points. The verification speed is fast, and it takes only about 10 minutes to verify the two pressure transmitters.

   before starting the verification, automatically start the high-power vacuum pump, quickly pump the pressure in the vacuum cover to within 20Pa, then automatically load the weight according to the fixed value, and automatically pressurize until the piston is jacked up and stabilized for a specified time, and then enter the lower point.

Since the atmospheric pressure sensor is installed, the absolute pressure and gauge pressure can be switched.

   as shown in the figure below, the fixed value can be operated by the "set value increase" and "set value decrease" keys according to the control step step method, or it can be directly operated by the input window on the touch screen, and the control step can be modified at will; After the piston is jacked, the descent speed is automatically calculated. When the pressure is controlled, the weight will automatically rotate, and when it stops, the rotation will automatically stop; Automatically measure two circuits of current, and can verify two absolute pressure transmitters at the same time.

2. Function

Automatically verify the pressure transmitter, automatically record the verification results, and automatically print the verification report;

Automatic verification of precision digital pressure gauge, automatic recording of verification results, automatic printing of verification report;

Automatic verification of precision pressure gauge, automatic calculation of error, automatic recording of verification results, automatic printing of verification report.

If the kilogram weight is used, the piston pressure gauge can be calibrated automatically.

3. Related patents

two hundred and one billion eight hundred and ten million five hundred and sixty-seven thousand four hundred and eight point five

two hundred and one billion eight hundred and twenty million eight hundred and fifty-eight thousand nine hundred and twenty-nine point one

two hundred and one billion nine hundred and twenty million four hundred and sixty-two thousand two hundred and seventy-five point five

two hundred and one billion nine hundred and ten million two hundred and seventy-six thousand two hundred and ninety-seven point seven

4. Technical indicators

1) Absolute pressure and positive pressure measurement range and resolution:

2) Measurement range and resolution of positive and negative voltage

3) Accuracy:

Pressure: 0.005, 0.01, 0.02, 0.05.

Current: (0 ~ 22) MA, level 0.02.

Voltage: (0 ~ 5.5) V, level 0.02.

4) Others:

24V power output function, with 2 electric quantity measurement channels, which is convenient to verify the pressure transmitter.

Weight material: non magnetic stainless steel.

Material of piston rod and cylinder: tungsten carbide.

Pneumatic working medium: high purity nitrogen.

Overall dimension: Ф 400*500mm

It can be connected with tmms-2000 software to automatically print the verification report.

You can query the verification results on the touch screen or export the verification results with a USB flash disk.

5. Performance characteristics

Fully automatic loading of weights.

All weights rotate synchronously, and there is no wear during weight loading.

Built in special pressure source, automatic pressurization.

Built in pressure, current, voltage, temperature and humidity sensors.

Built in piston position and speed measurement.

Conform to the national metrological verification regulations of jjg1086-2013 gas piston pressure gauge and jjg99-2006 weights.

Full automatic weight addition and subtraction: the weight not placed on the hanging blue rotates synchronously with the weight placed on the hanging blue. The weight is loaded at the synchronous speed. The weight loading process has no wear, good stability and fast pressurization speed.

Wear free anti break rod piston system is adopted, rolling mode is adopted at the limit position, and the piston disc is free of wear.

The full-automatic pressure source dedicated to the piston is used for full-automatic pressurization, which has fast pressurization speed and fast stability speed.

Digital terminal monitoring parameters: touch screen operation, which displays information such as ambient atmospheric pressure, ambient temperature, ambient humidity, current pressure, piston position, piston temperature, piston speed and weight combination;

Correction of pressure value: parameters such as pressure, gravity acceleration and piston temperature in the vacuum cover are automatically corrected by software;

Automatic weighting: block weights and cylindrical weights are freely combined and automatically loaded; Internal hanging weight is adopted, with no failure point and extremely low failure rate;

Three tested fast interfaces are configured as standard, and multiple (3-4) extensions can be configured to verify multiple sensors;

Function: automatic verification of pressure transmitter, digital pressure gauge and pressure gauge.

6. Advantages

6.1 wear resistance is achieved

with patented anti-wear design (patent numbers: 201920462275.5 and 201910276297.7), the weight quality stability can be maintained for a long time.

with patented anti-wear design (patent numbers: 201810567408.5 and 201820858929.1), the quality stability of piston chassis can be maintained for a long time.

   1) all weights (the suspended weight and the weight loaded on the hanging blue) rotate synchronously, and there is no relative movement and wear during the weight loading process.

   2) the limit of piston disc adopts bearing limit. The piston rotates at its limit position, and the piston head is free of wear under any working condition.

   at present, the full-automatic piston pressure gauge, including imported ones, has a relatively slow pressure stabilization speed. The main reason is that the weight can be rotated only when the piston is in suspension. When the piston is at the upper and lower limits, it is not allowed to rotate the weight because of fear of wear. Moreover, the piston pressure gauge is a precision instrument, and impact is not allowed, so the acceleration of rotating and stopping the weight must be very slow. Resulting in a slow stabilization speed. It usually takes 3-5 minutes.

   apsl801 fundamentally solves the problem, and the weight can keep rotating all the time. It only takes 30 to 60 seconds to stabilize a pressure.

   only by preventing wear and tear, the annual stability can be guaranteed, the verification speed can be fast, and the efficiency can be improved.

6.2 internal hanging weights are used, with few faults

   the circumferential hook of apsl801 weight is processed as a whole with the weight. There is no moving part. When loading the weight, the four sides rise and fall at the same time, which is quite stable. There is basically no fault point, and generally there will be no fault. Sudden power failure during use will not cause failure.

   there are many failure points of pneumatic loading. Each weight has three telescopic hooks or rotating hooks, which are driven by the cylinder. Due to wear and lubrication problems, it is easy to fail, and any one of them will not work if it fails. If a hook fails, the weight will be unbalanced and fail. Pneumatic loading has high requirements for air source. Sudden power failure or gas failure during use may cause failure.

6.3 stable weight loading

   apsl801 loading weight is realized by lifting and dropping the suspended weight, which is relatively stable without impact. Pressurization and loading weight are carried out at the same time.

   when loading binary weights, all weights must be put down, and then the unused weights must be hoisted. Moreover, the speed is fast (the cylinder controls the hook, and it is impossible to move slowly) and the impact is large. During the downward stroke, the piston rod drops rapidly, and then rises rapidly. Generally, an automatic shut-off valve is equipped in the front of the tested connecting pipe to ensure that the pressure overshoot or too low does not affect the tested instrument during the weight switching process.

6.4 piston pressure gauge and pressure source are arranged separately, without vibration

   apsl801 piston pressure gauge and pressure source are arranged separately and connected through wires and pipes. The small vibration of the motor of the pressure source during operation will not be transmitted to the piston pressure gauge, ensuring that the piston pressure gauge has accurate measurement, fast pressure stabilization speed and long service life.

6.5 others

   built in pressure, current, voltage, temperature and humidity sensors, sent by 24V power supply. It is convenient to calibrate the pressure transmitter.

   built in piston position, speed and lifting speed measurement.

7. Model selection