The flow accumulation control instrument collects, displays, controls, transmits, communicates, prints, and processes various signals such as temperature, pressure, and flow on site, forming a digital acquisition system and control system. It has LCD and digital displays, various external dimensions, and is suitable for flow accumulation measurement and control of various liquids, general gases, superheated steam, and saturated steam; It can perform quantitative/batch control on the medium (with start, stop, and reset functions), and can be used in conjunction with various flow sensors or transmitters to adapt to various measurement and control scenarios.

Characteristics of flow integrator:
1. The flow integrator can be used in conjunction with various flow sensors or transmitters, temperature sensors or transmitters, and pressure transmitters to measure and display flow parameters of various liquids, steam, natural gas, general gases, etc., accumulate calculations, alarm control, transmission output, data acquisition, and communication.
Functional features:
(1) Full range automatic temperature and pressure compensation calculation, with compensation methods set arbitrarily;
(2) Linear integration and square root integration can be set arbitrarily;
(3) Display of multiple parameters including instantaneous flow rate, cumulative flow rate, temperature, and pressure;
(4) Small signal resection function, with a selectable resection range of 0-5%;
(5) The accumulated traffic value can be reset to zero through the panel buttons, and the reset operation can be locked.
2. The flow integrator can accumulate and calculate the mass, volume, and length of substances, and can also perform batch control. It adopts mature and mass-produced AI series instrument universal hardware, combined with excellent flow integrator software, making the instrument feature rich functions, easy programming, good anti-interference, high reliability, fast delivery, low cost and low price.
The main features of the instrument are as follows:
(1) Programmable input specifications, flow input signals can be programmed to 1-5V, 0-5V, 4-20mA, frequency, etc. The temperature signal can be programmed as a Pt100 thermistor, K, E, J type thermocouple, or standard current signal, while the pressure signal can be a standard voltage or current signal.
(2) It can install various universal modules and rich programmable functions of AI series instruments, and can achieve upper and lower limit alarm functions for instantaneous flow, temperature, and pressure. It also has multiple functions such as transmission output, communication, 24V/12V voltage output, etc.
(3) Equipped with an 8-bit accumulator and a 4-digit instantaneous measurement value display, it can select square root/non square root processing and set the small signal cutoff function within any range.
(4) It has complete temperature and pressure compensation functions, without the need to replace different instruments or models. Temperature and pressure compensation calculations for general gases, saturated steam, superheated steam, and liquids can be achieved through programming. Using a lookup table to perform compensation calculations on steam has high accuracy.
(5) When used as a batch controller, the instrument has independent 4-digit control accumulator and 12 bit total accumulator, as well as dedicated display status, which is powerful and easy to operate.
(6) Advanced computational methods ensure sufficient flow calculation accuracy for frequency signals even at very low frequencies.
Model definition: The instrument adopts advanced modular design. The functions of traffic signal input, communication, and transmission can be configured with different modules according to the actual needs of users, making configuration flexible and convenient. The instrument allows for a maximum of 5 modules to be installed. The pressure and temperature input methods of any instrument can be freely set, so the input methods of temperature and pressure are independent of the model.
Main technical indicators of flow integrator:
Basic error: 0.5% fs or 0.2% fs ± 1 word
Resolution: 1/20000, 14 bit A/D converter
Display mode: dual row simultaneous display, the upper four digit digital tube displays instantaneous flow, and the lower eight digit digital tube displays cumulative flow. Sampling period: 0.5s
Alarm output: instantaneous flow limit alarm, relay output contact capacity ac220V/3a
Transmission output: 4-20mA, 0-10mA, 1-5V, 0-5V
Accuracy: ± 0.3%
Communication output: Interface mode - isolated serial bidirectional communication interface rs485/rs422/rs232/modem
Baud rate: 300-9600bps, freely adjustable internally
Feed output: DC24V/50ma
Power supply: Switching power supply 85-265vac, power consumption below 4W
Input characteristics:
Frequency type: Input impedance greater than 10kW
Voltage type: Input impedance greater than 300kW
Current type: Input impedance 250W
Output characteristics:
Relay capacity: 3A/220V AC or 3A/24V DC, resistive load
Current type transmitter output load impedance: less than 600W
Voltage type transmission output load: greater than 200KW
Scope of application of flow integrator:
Suitable for measuring, displaying, controlling, and integrating flow parameters of industrial processes such as tap water, oil, liquids, and solid fluids that do not require compensation. Can receive differential pressure input from orifice plates or input signals from various flow meters such as vortex street flow meters, electromagnetic flow meters, turbine flow meters, etc.
Applicable environment for flow integrator:
Environmental temperature: -10~55 ℃;
Environmental humidity: 10-90% RH.
Verification method for flow integrator:
There are generally two methods for calibrating flow meters: direct measurement and indirect measurement.
The direct measurement method, also known as the real flow verification method, is a method of measuring the actual flow rate through the calibrated instrument using other standard devices, comparing it with the flow rate value of the calibrated instrument, or dividing the instrument to be calibrated. The indirect measurement method is to measure the structural dimensions of the flow accumulation instrument sensor or other quantities related to the calculation of flow accumulation, and use them according to the prescribed method to indirectly verify the flow accumulation value and obtain the corresponding accuracy. The flow accumulation value obtained by indirect method verification is not as accurate as that obtained by direct method, but it avoids the difficulty of using flow accumulation standard devices, especially for large flow accumulation devices. Therefore, some flow accumulation instruments have already adopted indirect verification method.
In summary, there are various methods for calibrating flow integrating instruments, but the real flow calibration method is always the most basic and important calibration method. The reason why some instruments can be calibrated using indirect calibration methods is also based on the accumulation of rich experimental data using the real flow calibration method.