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LDM-51

LDM-51 open channel electromagnetic flow meter is a flow automatic measuring instrument use for continuous measurement in open pipeline(half pipe sewage or mass flow pipe with none down flow weir) by velocity-area method. It can measure and display instantaneous flow rate, flow velocity, accumulated flow rate and any other data. It’s specially applicable to the measurement of municipal rainwater、sewage water、waste water and irrigation water.

Classification:

Intelligent Open Channel Flow Meter

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Product Introduction

LDM-51 Open Channel Electromagnetic Flow Meter

I. Product function introduction

The LDM-51 open channel electromagnetic flow meter is composed by a electromagnetic velocity sensor, a water level sensor and a flow display. It continuous measure the flow rate and liquid level of the liquid in the pipe. The user only input the circular pipe diameter or width of the square pipes, LDM-51 open channel electromagnetic flow meter will automatically calculate and display the flow, instantaneous flow rate, flow velocity, accumulated flow rate and etc. measure parameters.

1.1 Basic function

(a)Low-frequency square-wave exciting, exciting frequency: 1/16 power frequency;

(b)Exciting current can be selected for 50mA, 75Ma, 100mA;

(c)Current speed range: 0.01 --- 10m/s，current speed resolution: 1mm/s;

(d)DC 3.6V switching power，range of voltage: 3.6VDC;

(e)DC 12V switching power，range of voltage：12VDC --- 30VDC;

(f)Network function：MODBUS(RTU), TTLLEV 3.6VDC power;

(g)English displaying mode(other languages can be set);

(h)Forward and reverse measurement could be customized, and record: Forward gross, reverse

gross, show 10-digits;

(i)Used for open channels(circular, Rectangular, and special channels);

(j)Used for continuous measurement of municipal rainwater, sewage water, waste water and irrigation water;

(k)Both forward and reverse flow measurement;

(l)Sensors can be in bad live and waste water quality under long-term reliable operation;

(m)The velocity measurement range: 0.05 --- 10 m/s;

(n)High measurement precision and it is not affected by the downstream tributary of harmony to

the factors of water blocking;

(o)Short measuring pipe straight pipe requirements;

(p)Big screen back light liquid crystal display, whether bright light or night to be able to clearly

read measurement data;

(q)Instrument display and output the function is available, it can display instantaneous flow

velocity of cumulative flow data, and communication interface with the computer RS485

(optional);

(r)GSM and GPRS wireless data remote transmission function (optional);

(s)Nominal diameter circular pipes: DN100 --- DN6000(ultrasonic level meter: depth DN<h; range

> 5cm; stress level meter 2DN<h; range>2cm. DN is diameter size)

(t)Rectangular pipe: width ≤6m, depth ≤32m.

1.2 Special function

Remember the historical data forever, zero point adjust automatically. It could connected with

current meter(4-20A signal)

1.3 Normal working condition

Ambient temperature： –10～+ 60℃;

Relative humidity：5%～90%;Power supply：AC220V, 110V DC12V, 3.6V battery;

Dissipation power: less than 5W.

1.4 Connection types with sensors

Remote type: squared shell, shell connect with sensor by cable;

1.5 Converter’s appearance

LDM-51 LS Converter shell series

Ⅱ.Specification Table

Category	Item	Specification
Converter	Measurement Accuracy	Water level: ±2 mm; Velocity: ±1.0%; Flow rate: ±2.5%
	Measurement Range	Velocity: 0.01–15 m/s
	Power Supply	3.6V / 12V / 24V / 220V / Solar power (multiple options available)
	Output Signals	4–20mA / 0–10mA analog output; Pulse / frequency output; Switch signal output (optional)
	Communication Interfaces	RS485, RS232, MODBUS protocol, HART protocol (optional)
	Protection Grade	IP65
	Max. Total Flow Display	9999999999
	Max. Instantaneous Flow Display	10000
	Max. Velocity Display	19.99
	Max. Water Level Display	19.999
	Power Consumption	< 5 W
Sensor	Velocity Sensor Types	Electromagnetic, Radar, Ultrasonic (customizable)
	Water Level Sensor Types	Pressure, Ultrasonic, Radar, Magnetostrictive (customizable)
	Signal Cable	Standard length: 15 m (customizable)
	Protection Grade	IP68
Optional Accessories	Optional Accessories	Solar power system, Mounting bracket, Embedded parts for bracket, Stainless steel instrument box, Buried battery box, Communication module