Ⅰ、Overview of system

  In our country metallurgy, nonferrous metal, chemical, building materials and coal and other departments, fan has been widely used. In order to keep the fan running in the high efficiency zone, the operating condition point of the fan must be selected according to the fan performance curve. Therefore, the fan performance test must be carried out before the fan leaves the factory to accurately draw the performance curve. In order to meet the requirements of modern test technology, increase the stability of the experimental process, improve the accuracy and efficiency of the test, this system adopts a set of fan performance automatic detection and analysis system based on Windows environment. The system can realize the collection and analysis of test data in the fan performance test, control and test data storage, query and other functions, and has intuitive and convenient man-machine The results of field operation show the effectiveness and superiority of the system.

  This system refers to the national standard GB 1236-85 "Ventilator Aerodynamic performance test method", hardware structure and function The hardware of the system mainly realizes the acquisition, conversion, amplification, shaping and processing of each physical signal. The hardware of the test bench is mainly composed of sensors, data acquisition system, computer, etc. The main structure is shown in Figure 1.

Figure 1 Portable aerodynamic performance test system for fan

  The hardware of the signal acquisition system uses a CompactDAQ chassis to control the timing, synchronization and data transmission between the C series I/O module and the external host. These cases offer connectivity options such as USB, Ethernet, or WiFi, with multiple slots to provide sufficient I/O for a variety of applications. The CompactDAQ chassis features a bus-powered USB chassis designed for small portable sensor measurement systems. You can use these cases with C-Series I/O modules to create combinations of analog I/O, digital I/O, and counter/timer measurements. The CompactDAQ chassis can include multiple general-purpose counters/timers that you can access through the installed hardware Timing Digital C Series module for applications involving quadrature encoders, PWM, event counting, pulse train generation, and period or frequency measurements. The CompactDAQ chassis also provides multiple timing engines that run multiple hardware timing operations simultaneously at independent rates against analog inputs.

  The signal acquisition system hardware also includes the Model Model 9216 electronic pressure scanning valve, which integrates 16 silicon piezoresistive pressure sensors with the latest microprocessor technology for any pressure range in a compact, rugged package. Each field replaceable pressure sensor includes a temperature sensor and EEPROM to store calibration data as well as sensor identification information such as pressure range, factory calibration date, and last or next calibration date managed by the user. The microprocessor uses the data from the EEPROM to correct for sensor offset, range, linearity, and thermal errors. The microprocessor's digital temperature compensation algorithm can reduce the sensor thermal error compensated by traditional sensors by a factor of 10 or more. The microprocessor also controls the actuation of the overall manifold to calibrate the zero or range online upon request. This function actually eliminates the sensor offset drift error, so that the system accuracy error is less than ±0.05% FS (full scale). 9216 Up to three concurrent scan lists can be used to sample through time stamps at a continuous rate of up to 500 measurements per second per channel in an engineering unit. Pressure data within the engineering unit are output via an auto-negotiated 10 or 100Mbit Ethernet interface that supports both TCP and UDP protocols.

Ⅱ、System composition

1.Model 9216 electronic pressure scanning valve

  Model 9216 electronic pressure scanning valve supports 16 pressure channels; The measurement accuracy of the system (including nonlinear, hysteresis and repeatability errors) was ±0.05% FS. The sampling rate of each channel was adjustable, and the maximum was 500 Hz. The operating temperature of the host is -30 to 80°C, and the storage temperature is -30 to 80°C; Temperature compensation range: -30°C to 60°C; Automatically set 10/100 Base-T Ethernet interface; Support TCP/IP, UDP protocol, static or dynamic IP allocation; Instruction trigger, external trigger (TTL level), timing trigger, support PTP time synchronization protocol, data with time stamp; The protection level is IP66; The input voltage was 12~36VDC, and the reference terminal tolerated pressure was more than 500kPa. The calibration period of measurement accuracy was 12 months. Support self-testing and factory recovery; Support zero calibration, full scale calibration, custom calibration; Support high-speed data stream acquisition; Support 32 times, 64 times and other mean filtering; The air path connection specification is φ1.6mm×0.3mm (outer diameter × wall thickness), with a stop clamp; The external dimensions were 241.3 mm×88.9 mm×89.92 mm.

FIG. 2 9216 electronic pressure scanning valve

2. NH122W atmospheric temperature sensor

  NH122W atmospheric temperature sensor adopts imported sensing core, metal shell structure; It has the characteristics of strong structure, long service life, high measurement accuracy, good stability, long transmission distance, and strong resistance to external interference, which conforms to the WMO World Meteorological Organization specification (CIMO Guide). It can be widely used in environment, agriculture, aquaculture, greenhouse, laboratory and other occasions where pressure measurement is required. Output signal: 4-20mA current loop; The accuracy was ±0.2℃. The measurement range is -50℃-80℃; The lead length is 0.5m; Power consumption ≤240mW@12V; The operating voltage is DC 7.5V-36V.

Figure 3 NH122W atmospheric temperature sensor

3. NH122Y atmospheric pressure sensor

  NH122Y atmospheric temperature sensor adopts imported sensing core, metal shell structure; It has the characteristics of strong structure, long service life, high measurement accuracy, good stability, long transmission distance, and strong resistance to external interference, which conforms to the WMO World Meteorological Organization specification (CIMO Guide). It can be widely used in environment, agriculture, aquaculture, greenhouse, laboratory and other occasions where pressure measurement is required. Output signal: 4-20mA current loop; The measurement range was 100-1100hpa. Power consumption ≤240mW@12V; The operating voltage is DC 7.5V-36V.

Figure 4 NH122Y atmospheric temperature sensor

4. PT100 platinum thermal resistance temperature sensor

  PR-11-2-100-1/16-6-E temperature sensor is precision 100ΩA DIN platinum element; Small 1/16in diameter or 1.5mm probe; There are four probe styles to choose from: PR-11 immersion probe with conversion function; PR-13 standard size quick disconnect probe; PR-16 handheld probe; PR-17 micro quick disconnect probe; Four sheath lengths are readily available in standard sizes (6in, 12in, 18in and 24in) or metric sizes (150mm, 300mm, 450mm and 600mm). System equipped with temperature sensor conversion plug probe, 100Ω grade A DIN platinum element with PFA lead, 1/16in diameter sheath, 6in sheath length.

Figure 5 PT100 platinum thermal resistance temperature sensor

5.ROLS-W laser speed sensor

  Monarch-ROLS laser speed sensor, the sensor housing is made of threaded stainless steel for easy fixation, using red visible laser source. After the effective signal is collected, the green LED light in the tail is on, indicating that the measurement is effective, the range is large, and the application range is wide. The measuring distance is 7.62m, the maximum inclination Angle is 70°, and the range is 1-250,000 RPM. The temperature range is from -10℃ to 70℃; The power supply voltage is 3.3Vdc-15Vdc, the signal output is TTL, and the connecting line length is 2.4m. The size is 79.4×ɸ18(mm) long, which is suitable for most applications with long measurement distances.

Figure 6 The ROLS-W laser speed sensor

6.cDAQ-9185 chassis

  cDAQ-9185 is a 4-slot, TSN-based Ethernet CompactDAQ chassis. The cDAQ-9185 is a bus-powered CompactDAQ Ethernet chassis designed for small or distributed sensor measurement systems. The chassis also controls the timing, synchronization, and data transfer between the C Series I/O module and the external host. You can combine a variety of C-Series I/O modules to create combinations of analog I/O, digital I/O, and counter/timer measurements. The chassis provides accurate, synchronized timing through the use of TSN's network, ideal for long-distance high-distribution measurements. The chassis has an integrated network switch, and the chassis also has four 32-bit universal counters/timers accessible through the hardware timing Digital C-Series module for applications involving quadrature encoders, PWM, pulse train generation, and more.

Figure 7 cDAQ-9185

7.NI-9217 temperature input module

  Ni-9217 temperature input module is 4 channels, 400S/s total sampling rate, 0Ω-400Ω, PT100 RTD C series temperature input module, NI 9217 is a resistance temperature detector (RTD) input module. NI‑9217 can be configured for two sampling rate modes: high sampling rate or high resolution. NI‑9217 can be compatible with 3 - and 4-wire RTD measurements, can automatically detect the type of RTD connected to the channel (3 - or 4-wire) and can automatically configure each channel into the correct mode. The module provides a per-channel current excitation. The NI-9217 features a calibration function and a dual-channel ground isolation barrier to achieve safety, immunity, and a high common-mode voltage range.

Figure 8 NI-9217

8.NI-9253 current input module

  The NI-9253 current input module is a 50kS/s/ch, ±20mA, 24-bit, 8-channel C-series current input module. The NI-9253 is an 8-channel analog input module for ComapctDAQ and CompactRIO systems. Each channel provided ±20 mA input range and 24-bit resolution with a sampling rate of 50kS/s. The NI-9253 has multiple diagnostic functions to ensure proper system operation, with open channel detection, power supply detection, and configurable thresholds. The NI-9253 has eight LED indicators to indicate the status of each channel and power supply so that field users can easily verify that the system is operating properly. The NI-9253 also has a number of programmable hardware filters. The selection of specific Butterworth and comb filters for the application can significantly reduce the noise of the system.

Figure 9 NI-9253

9. NI-9265 current output module

  The 4-channel C-Series current output module, NI‑9265 is ideal for high-speed connection and control of industrial current-driven actuators. The module has a built-in open loop detection function, which interrupts the software when an open loop is detected, and at the same time zeros the output to ensure safety and avoid driving the actuator when the system is powered on. NI 9265 requires an external power supply, through the channel ground/ground double isolation barrier to ensure security and noise resistance.

Figure 10 NI-9265

10. NI-9401 digital input module

  The NI-9401 is a bidirectional digital module that can be used in NI CompactDAQ or CompactRIO chassis. The eight DIO channels are divided into two groups of ports, and the input or output can be configured independently. Custom digital systems such as counters/timers, digital communication protocols, pulse generation, and more can be implemented with the NI 9401.

Figure 11 NI-9401

11.PS-15 power supply module

  The PS-15 power module is used to power CompactDAQ and CompactRIO systems, CompactRIO single-board controllers, smart cameras, touch panel computers (TPCS), and more. 24 VDC to 28 VDC, 5 A, 120 W, DIN rail mounted industrial power supply that includes DIN rail mounted accessories for field connection and tool-free installation of spring clamp terminals. The PS-15 has an output power of 120 W and operates at temperatures ranging from -25°C to +60°C. The PS-15 has an input range of 100 VAC to 240 VAC to meet regional requirements for power cords. In addition, the industrial power supply copes with load fluctuations through a 20% power reserve, and this additional current can be used continuously when the ambient temperature is below 45°C.

Figure 12 PS-15 power module

12.9IFC scanning interface

  The 9IFC scan interface provides power and communication for the Model 9216 smart pressure scan valve, provides the user with DC power and hardware trigger inputs, and an Ethernet interface for TCP communication. The 9IFC provides industry-standard connectivity for every input and a reliable design for multiple installation options. The input voltage is 110 V AC or 220 V AC; 10/100 Base-T Ethernet interface; Trigger interface option (optional).

FIG. 13 Scanner interface, universal AC power supply