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How to choose a proper type caustic soda flow meter?

Date:2019-03-28
Caustic soda, the chemical formula is NaOH, commonly known as sodium hydroxide, caustic soda, is a kind of aggressive alkali with strong corrosivity.

Caustic soda is highly corrosive. If you want to measure the flow of caustic soda solution, it is a tough job. Turbine flowmeter, Vortex flowmeter is easily corroded by NaOH. We generally choose electromagnetic flowmeter to measure the caustic soda flow.

Magnetic flow meter is based on Faraday’s low of induction, it can measure conductive liquid flow rate, and due to caustic soda is conductive, we can use mag meter to measure caustic soda. Besides, it can measure portable water, milk, juice, waste water and so on. It is now a kind of widely used flow meters.

Choose the suitable caustic soda flow meter. We need to provide the following parameters to the electromagnetic flowmeter manufacturer:

NaOH concentration and operating temperature

Different concentrations and working temperatures of sodium hydroxide have different degrees of corrosively. We choose different electrode materials and lining materials. Please refer to below tables:

concentration

Temperature

Electrodes material

Liner

316L

Hastelloy c

Titanium

Tantalum

Platinum

PTFE

PFA

10~20%

Room temperature

34~50%

Room temperature

10~20%

150

30~50%

70~150

50%

180

60~100%

~150

Sodium hydroxide flow range and pipe line size

Caustic soda flow meters

The flow meter sensor size is based on the flow range. See the following table for reference:

Size(DN)

Pressure

Min flow range

velocity(0-0.5)m/s

Max Flow range

velocity(0-10)m/s

10

4.0 Mpa

(0-2.25)L/min

(0-45)L/min

15

4.0 Mpa

(0-5)L/min

(0-100)L/min

20

4.0 Mpa

(0-7.5)L/min

(0-150)L/min

25

4.0 Mpa

(0-10L)/min

(0-200)L/min

32

4.0 Mpa

(0-20L)/min

(0-400)L/min

40

4.0 Mpa

(0-30L)/min

(0-600)L/min

50

4.0 Mpa

(0-3)m³/h

(0-60)m³/h

65

4.0 Mpa

(0-6)m³/h

(0-120)m³/h

80

4.0 Mpa

(0-9)m³/h

(0-180)m³/h

100

1.6 Mpa

(0-12)m³/h

(0-240)m³/h

125

1.6 Mpa

(0-21)m³/h

(0-420)m³/h

150

1.6 Mpa

(0-30)m³/h

(0-600)m³/h

200

1.6 Mpa

(0-54)m³/h

(0-1080)m³/h

Flow meter process connections, especially flange standards

The flange standard Silver Automation Instruments provide is DIN standard. If the ANSI standard and JIS standard are required, please specify to the electromagnetic flowmeter supplier at the time of inquiry.

Flow meter function

Caustic soda flow meters have different functions, below we list the normally request functions:

  • RS 485(Modbus RTU)
  • Hart Protocol
  • Profibus DP
  • Remote display or integral type display
  • Protection level, such as IP 65 or, IP67 or IP68?

Provide power supply for the magnetic flow meter

For caustic soda flow meter, we have 3 power supply types

220V AC±20%

24V DC

Battery power supply (3.6V lithium battery)

Welcome to contact us to obtain more technical specifications about caustic soda flow meters .

Caustic soda flow meters


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