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Full Line of Digital and Analog Displays

Application:

Petroleum, chemicals, synthetic fibers, transportation, commerce, food, pharmaceuticals and healthcare, etc.

Measuring Range：:

0.2~340 m3/h

Protection Grade：:

IP65

Accuracy：:

±0.2% .±0.5％

Process Pressure：:

1.6~6.3Mpa

Process Temperature：:

-20~+200℃

Process Connection：:

Flange:DN10~200

Explosion proof certification:

CE.dbia [ia Ga] lIC T6 Gb

Power supply:

12~24VDC

Signal output:

4-20mA . pulse .RS485

MOQ:

1 SET

Payments:

TT, Paypal, Credit card, Western union

Shipping ways:

Express(DHL,Fedex,TNT,EMS,UPS)/Air/Sea

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Product Overview

The oval gear flowmeter is a positive-displacement metering instrument used for continuous or intermittent measurement and control of liquid flow in pipelines. It offers numerous advantages, including a wide measurement range, high accuracy, low pressure loss, strong adaptability to various viscosities, the ability to measure high-temperature, high-viscosity liquids, convenient calibration, and easy installation. It is suitable for flow measurement in industries such as petroleum, chemicals, chemical fibers, transportation, commerce, food, and pharmaceuticals and healthcare.

The LC series oval gear flowmeters are equipped with a pointer and a cumulative counter mechanism, enabling direct on-site display of the cumulative flow of liquid passing through the pipeline. By adding a signal transmitter to the counting mechanism and pairing it with an electronic display instrument, remote transmission and centralized control of cumulative, volumetric, and instantaneous flow rates can be achieved. The addition of a heat sink or an oval gear with missing teeth allows for the measurement of high-temperature, high-viscosity liquids.

Depending on the type of liquid (acids, alkalis, salts, organic solvents, etc.), the flowmeter body can be manufactured from different materials.

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Structure and Operating Principles

An oval gear flowmeter consists of a flow transmitter and a counting mechanism. When a heat sink is installed between the transmitter and the counting mechanism, the result is a high-temperature flowmeter. The transmitter comprises a measuring chamber containing a pair of oval gear rotors and a sealed coupling, while the counting mechanism includes a reduction gear, an adjustment mechanism, a counter, and a signal transmitter.

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nside the metering chamber, a pair of oval gears and a cover plate form a crescent-shaped cavity that serves as the unit of measurement for flow. The oval gears rotate due to the pressure difference between the flowmeter’s inlet and outlet, continuously metering the liquid through the crescent-shaped cavity and delivering it to the outlet. The volume of liquid passing through per revolution is four times the volume of the crescent-shaped cavity. A sealed coupling transmits the total number of revolutions and the rotational speed of the oval gears to a counting mechanism or transmitter, thereby determining the total volume of liquid passing through the pipeline and the instantaneous flow rate.

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Functions and Codes of Various Counters

Function	A1	A	Z	Type 13	J1	ELZ
Pointer with 6-digit roller totalizer	●	●	－	－	－	－
Pointer with 6-digit roller totalizer & zero-reset function	●	●	●	－	－	－
Pointer type with pulse transmitter	●	－		－	●
Single pulse output (signal output only)	－	－	●	－	－	－
LCD Display (Instantaneous flow, Total flow, 4–20mA, Pulse signal, RS485)	－	－		－	－	●

Performance (Error and Pressure Drop Curves)

Explanation:

1. For the various liquids shown in the figure, the accuracy adjustment device can be used to adjust the flowmeter’s error to just above or below the zero axis, thereby optimizing the error.

2. When the flow range ratio is reduced for any liquid, the accuracy adjustment device can be used to improve the flowmeter’s accuracy.

Technical Specifications

High-Precision Elliptical Gear Flow Meter (Accuracy: 0.2%)

Model/Technical Specifications	LC—A Cast Iron Model	LC—B Stainless Steel Model	LC—E Cast Steel Type
Nominal Pressure (MPa)	1.6	1.6、2.5、4.0、6.3	1.6、2.5、4.0、6.3
Temperature Range (°C)	Standard analog: -20 to +80; High-temperature analog: -20 to +200; Standard LCD: -20 to +60; High-temperature LCD: -20 to +150;
Accuracy Class	0.2%
Diameter (mm)	Viscosity: 0.6–2 mPa·s	Viscosity: 2–200 mPa·s
10		0.2–0.4 m³/h
15		0.5–1.5 m³/h
20	1.5–3 m³/h	1–3 m³/h
25	3–6 m³/h	1.2–6 m³/h
40	8–15 m³/h	5–15 m³/h
50	12–24 m³/h	8–24 m³/h
65	20–40 m³/h	10–40 m³/h
80 (Light Duty)	20–40 m³/h	10–40 m³/h
80 (Heavy Duty)	30–60 m³/h	15–60 m³/h
100	40–100 m³/h	20–100 m³/h
150	90–190 m³/h	56–190 m³/h
200	170–340 m³/h	68–340 m³/h

Technical Specifications

The LC-13 Elliptical Gear Flow Transmitter consists of a main unit and a transmitter. It converts the liquid flow rate in a pipeline into a flow pulse signal or an analog signal for output. It can be used in conjunction with our company’s display instruments or with other secondary instruments and systems to meet the needs of remote measurement, display, automatic control and regulation, and recording.

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Transmitter

The GF-I and GF-II transmitters are high-precision pulse sensors designed for use with the LC series oval gear flowmeters. They convert the flow rate of the measured medium into an electrical pulse signal for remote transmission.

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GF Transmitter Wiring Diagram

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MF Series 4–20 mA

The MF flow transmitter is a device that converts the flow signal from a flowmeter into a 4–20 mA signal for output to a system terminal.

The LB07 has a total of 5 parameters, namely P00–P04, described as follows:

P00: Flowmeter coefficient (pulse equivalent), units: 0.00001–9.99999 liters/pulse

P01: Maximum flow rate of the flowmeter (i.e., measurement range), in m³/h, with two fixed decimal places

P02: Minimum flow rate of the flowmeter (used to calculate zero-return time), in m³/h, with two fixed decimal places

P03: 4–20 mA zero adjustment; the higher the value, the greater the current, and vice versa

P04: 4–20 mA full-scale adjustment; the higher the value, the greater the current, and vice versa

Commissioning Procedure

The LB07 has two buttons: the left button (M) and the right button (S). After the instrument is wired, the screen will display “LB07” followed by “F 0.00,” indicating it has entered the operating state. In the operating state, briefly press the M button to switch the display to cumulative reading in liters. Press the M button again briefly to display the current value. Users can verify the readings using test equipment. Press the M key again to cycle through the three values in sequence.

Press the S key while the cumulative total is displayed to reset the cumulative total to zero. This function is used to check for lost pulses.

Parameter Modification

In run mode, press and hold the S key; the screen will display “P00” followed by the P00 value. Press the S key briefly to cycle through P01, P02, and so on. To modify a variable, after the variable value is displayed, press the M key briefly; the first digit of the value will flash. Use the S key to increment the value, then shift the display, and increment again. Once the variable is set, briefly press the M key until all digits stop flashing, then press and hold the S key to display the next variable and repeat the process. When all variables have been modified, press and hold the S key until “SaUEd” flashes on the screen and the unit returns to running mode; at this point, the parameters are saved.

Wiring Instructions

1：V+; 2：SO 3：I+ 4：GND

Function	Terminal Name	Wiring Method
Two-wire 4–20 mA output	V+	24V Power Supply Positive Terminal
Two-wire 4–20 mA output	GND	2-Wire 4–20 mA Positive Terminal
3-wire 4–20 mA output	V+	24V Power Supply Positive Terminal
	I+	4–20 mA Current Output Positive Terminal
	GND	4–20 mA Current Output Negative Terminal, 24V Power Supply Negative Terminal

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Dimensional Drawing

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Dimensions of Stainless Steel Oval Gear Flow Meters (Unit: mm) (High-Temperature Type: For DN50 Light Duty and below, add 100 mm to B; for DN50 Heavy Duty and above, add 160 mm to B)

DN (mm)	L (mm)	H (mm)	B (mm)	C (mm)	I (mm)	D (mm)	D1 (mm)	N	Ф (mm)
10	170	100	212	120	45	90	60	4	14
15	200	120	246	132	48	95	65	4	14
20	230	145	258	148	58	105	75	4	14
25	260	182	258	156	64	115	85	4	14
40	265	182	290	181	77	150	110	4	18
50	265	182	305	200	92	165	125	4	18
65	365	260	365	310	125	180	145	4	18
80 (Light Duty)	350	260	365	275	125	200	160	8	18
80 (Heavy Duty)	420	325	443	263	118	200	160	8	18
100	515	418	468	288	131	220	180	8	18

*Flange dimensions are based on the 1.6 MPa standard; (length and flange dimensions can be customized);

*Dimensions of high-temperature elliptical gear flowmeters: DN15–DN50 (light duty)—Dimension B is calculated by adding a 100 mm thermal expansion pipe to the values in the table above; DN50 (heavy duty)–DN200—Dimension B is calculated by adding a 160 mm thermal expansion pipe to the values in the table above; all other dimensions are the same as the corresponding values in the table above.

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