Liquid turbine flow meter with MODBUS - SILVER AUTOMATION INSTRUMENTS LTD.

Liquid turbine flow meter with MODBUS

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Liquid turbine flow meter is low price flow measuring instrumentation for clean, low viscosity and low corrosive liquid flow measurement. It can be used for clean water, hot water, diesel, gasoline, milk, chemical addictive. It is a kind of cost-effective turbine flow sensor with current 4-20mA output. Silver Automation Instruments sell liquid turbine flow meter from China flow meter manufacturers at competitive price and good quality; it is a kind of stainless steel flow meter sensor.

Principle

Liquid passing the turbine sensor where there is rotor inside, the rotor is spinning at a speed which has close relationship with the fluid flow rate.

Features & Specifications

✔ High accuracy: 0.5% of Reading
✔ Large turn down ratio: 10:1
✔ Compact construction
✔ Protection level: IP65
✔ Output: 4-20mA or Pulse
✔ Communication: RS485,MODBUS-RTU
✔ Display: digital display
✔ Flow sensor size: DN4 to DN200 (8 inch turbine flow meter)
✔ Process connection: Thread, wafer, flange, tri-clamp
✔ Power supply: 24V
✔ Power consumption < 0.5W
✔ Input signal frequency: 0~3000Hz
✔ Material: 304 or 316 stainless steel

MODBUS RTU Turbine Flow meter Configuration.

This type of liquid turbine flow meter (TUF flow meter ) is MODBUS RTU.
The data format is n,8,1 ( 1 start bit,8 data bits, no check,1 stop bit.)
Baud rate options: 1200, 2400,4800 , 9600,19200
The instrument address is “01-99”, “0”is for broadcasting.
Our protocol does not support broadcasting, others address is reserved.

The turbine flow instruments applied MODBUS 0 x03 commands

Command 03(HEX)

Read single or multiple registers

THE data in the protocol is single floating-point number ,format is IEEE754, the data is from high to low.

Command 3 formats (read the register command)

Modbus Query

Address	1 BYTE	01-F7
Function	1 BYTE	03
Starting Address	2 BYTE	0-FFFF
Read Numbers	2 BYTE	N(1-7D)
CRC Low	1 BYTE
CRC High	1 BYTE

MODBUS Response

Address	1 BYTE	01-99
Function	1 BYTE	03（06、10）
Byte Count	1 BYTE	N*2
Input state	N*2 BYTE
CRC Low	1 BYTE
CRC High	1 BYTE

Error Response

Address	1 BYTE	01-F7
Function	1 BYTE	83
Error code	1 BYTE	01、02、03 (see note)
CRC Low	1 BYTE
CRC High	1 BYTE

Note: 01-Register address wrong, 02- Register length wrong, 03- CRC wrong

Date Definition

Property	Address (hex)	Register length(word)	Data type	Illustration
R	0001	2	Float	Instant flow
R	0003	2	Float	Totalized flow
R	0005	2	Float	CPU voltage, unit V

Example (turbine flow meter instrument address 01)

Query

01 03 0001 0004 15C9

CRC low in the front, and at the same time read instant flow and totalized flow.

Response

01 03 08

00 00 00 00 (instant flow =0)

42 84 00 00 (Totalized flow=66)

C1 86

Float high in the front, CRC low in the front

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