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Flow Rate Calibrator ЭнИ-251

Category: Metrological equipment

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The check, verification and calibration of vortex flow transducers (flow meters) Metran-300, Metran-305, Metran-320 by means of a no-spill (simulation) method.

Replaces the impulse generator, frequency meter, oscillograph, digital voltmeter, resistance box, timing device;
Conduct of flowmeter check and verification without their disassembly from the pipelines;
Duration of autonomous operation not less than 8 hours;
Compact body frame;
Opportunity to store up to 3,840 calibration protocols in a non-volatile memory storage.

Manufactured in accordance with the technical conditions EI.147.00.000 TC

Использование

Etc

A calibrator is a specialized impulse generator, frequency meter and milliampermeter functionally combined in one device.

The calibrator operation principle consists in the generation of a periodic signal coming on a special calibrated input of a verified vortex flow transducer and the calibrator measurement of corresponding transducer output signals, in particular: output frequency signal, output unified current signal, output pulse repetition period. The parameters of an output signal, measured impulse and current signals, are calculated by the calibrator according to the calibrating table and chosen calibration point.

The flow transducer calibration is performed in compliance with the calibration table stored in the calibrator non-volatile memory storage. For each flow transducer there is a separate calibration table. In total, the calibrator non-volatile memory storage can store up to 40 tables separated in four sets containing 10 tables each. Each calibration table can have calibration data for several inside diameters of a flow transducer (up to 10). Up to six calibrating points can be entered for each nominal diameter. In the process of the flow transducer calibration the flow value (m³/h) can be corrected by the operator for any calibration point.

The flow transducer calibration is conducted both manually and automatically. In case of manual calibration it is necessary to manually choose a calibration point and start the calibration operation. In case of automatic calibration is is enough to give a command for a flow transducer calibration. The calibration is conducted for all the points provided in the calibration table and the final report on the results is completed. At the completion of the calibration one makes up a calibration protocol saved into the calibrator non-volatile memory storage.

The contents of delivery includes a software providing for the following functions:

calibrator-PC communication through the interface of the standard RS-232 (with the help of an interface cable);
reading the calibration protocols for the flow transducer from the calibrator memory and transfer to a PC;
management of the protocol archive in the calibrator memory storage;
keeping protocol archive on a PC;
completion and printing a flow transducer calibration protocol;
setting the date and time in the calibrator;

calibration table editing.

Key technical characteristics

Parameter	Value
A.C. supply voltage range, V (for the calibrator external power supply unit)	183...242
A.C. supply voltage frequency, Hz (for the calibrator external power supply unit)	49...51
Power consumed by the calibrator (in the accumulator battery charge mode), V×А	4,5
Range of the calibrator supply voltages from the external power supply unit, V	12...20
Duration of autonomous calibrator operation at a fully charged accumulator battery, h	not less than 8
Repetition period of the calibrator-generator pulses in the interval, sec	0,002...6000
Generated impulse signal form	squarewave
Generated impulse signal amplitude at the load 2,7 kOm, V	6,5 ±0,5
Measured signal pulse repetition period, sec	0,002...900
Measured impulse signal amplitude, sec	3...40
Measurement range of the pulse repetition period, kHz	0...15
Ranges of a D.C. unified signal measurements, mA	0...5, 5...0, 4...20, 20...4, 0...20, 20...0
Input resistance of the calibrator on the pulse input, kOm	not less than 100
At the measurement of the D.C. Unified signal the voltage decrease on the calibrator does not exceed, V	2,5
Number of calibrated tables for a type of the calibrated flow transducer stored in the non-volatile memory storage	up to 40
Number of nominal diameter sections for each flow transducer type	up to 10
Number of calibration protocols for calibrated flow transducers stored in the non-volatile memory storage	up to 3840
Structural design	plastic body frame
Overall dimensions, mm	134×58×169
Assembly weight, kg	0,9

Parameter	Value
Limits of permissible basic percentage error in the reproduction of a pulse repetition period do not exceed, %	±0,04
Limits of permissible basic percentage error in the measurement of a pulse repetition period do not exceed, %	±0,04
Limits of permissible basic relative error in the measurement of a pulse repetition period frequency change do not exceed, %	±0,04
Limits of permissible basic percentage error in the measurement of a D.C. unified signal from the range of 0...20 MA do not exceed, %	±0,05
Limits of permissible complementary error in the measurement and reproduction of calibrator signals at the ambient temperature change within the operating range for every 10 °С of the temperature (20±2) °С, do not exceed	a half of the limit of permissible basic percentage error
Calibration interval, year	2

Diagram of ЭнИ-251 electric connection to flow transducers МЕТРАН-30ПР, МЕТРАН-305ПР

Diagram of ЭнИ-251 electric connection to flow transducers МЕТРАН-320ПР

Parameter	Value
Ambient temperature, °С	0...+50
In terms of the climatic version type the calibrator corresponds to the version under GOST 15150–96	УХЛ 3.1
In terms of mechanical impact resistance at operation it corresponds to the version group, under GOST R 52931–2008	N1
Ingress protection level, under GOST 14254–96	IP40

Warranty liabilities

Parameter	Value
Warranty operating life, months	36 months since the commissioning date but no more than 42 months since the date of manufacture

Contents of delivery

Name	Designation	Number	Note
ЭнИ-251		1
Data Sheet		1
Operation manual		1	it is allowed to supply 1 piece per 20 devices delivered to one address
Calibration method		1
Optical disc with software		1
Power supply unit		1
Interface cable for PC connection	null-moden cable DB9M-DB9M	1
Cable for connection of Метран-300ПР, Метран-305ПР		1
Cable for connection of Метран-320ПР		1
Bag (case)		1

Designations at the order

ЭнИ-251	360	ГП
1	2	3

Name.
Additional technological no-failure operating time 360 hours.
State calibration.

Certificates

ЭнИ-251 Certificate of Conformity for Measuring Equipment Type 19.01.2020 (RU))

Documents

Software

ЭнИ-251 Software 01.03.0001 (rar)

Feedback

Gazprom Transgaz Tchaikovsky, LLC

Articles

Flowmeter Calibration Without Disassembly is Possible!

Frequently asked questions

1. How can one use a flow transducer in production conditions?

Calibrator ЭнИ-251 is very convenient for the use in plant conditions to set and adjust flow transducers. In the continuous change mode a calibrator generates a simulation signal and measures an output signal from a flow transducer. It is one of the signals: current, period or frequency. The indicator shows the measured signal value (absolute), calculated value and error (signed). After error demonstration (for several seconds) the calibrator again measures an input signal (in a cycle). The measurement mode is accessible in any point given in the calibration table. Besides, it is allowed to enter an arbitrary flow value. Other parameters for measurement and generation are calculated by the calibrator in the automatic mode.