Better Ways to Use Differential Pressure Transmitter for Liquid Level Measurement

1. Overview

Differential pressure transmitters measure the difference between two pressures.

This equipment will sense the difference in pressure, between two ports and produce an output signal, with reference to a calibrated pressure range.

The industrial differential pressure transmitters are made of two housings.

The pressure sensing element is housed in the bottom half, and the electronics are housed at the top half.

It will have two pressure ports marked as “High” and “Low”.

It is not compulsory that the high port will be always at high pressure and the low port always at low pressure.

This labeling has its relation to the effect of the port on the output signal.

2. Function Parameters

• Applicable Object: Liquid, gas, steam
• Measuring Range: 0~0.1KPa--0~40MPa
• Output Signal: 4-20mA
• Power Supply: 12~45VDC, 24VDC is general
• Load Characteristic: Relative with power supply. The load capability in certain power supply and voltage refers to Pic2. Load impedance RL and supply voltage VS relation: RL≤50(Vs-12)
• Indicating Meter: Multiple parameters and multiple methods LCD indicating header
• EX-proof: a. Exd Type ExdIICT6 b. Intrinsic Safety Type ExidIICT4
• Range & Zero: Outer continually adjustable
• Positive & Negative Shift: When zero passes positive and negative shift, upper limit and lower limit of measuring range cannot exceed 100% of measurement upper limit. The maximum positive shift is 500% that of minimum adjustment range; the maximum negative shift range is 600% that o minimum adjustment range.
• Temperature Range:

Working temperature range of amplifier: -29~+93℃(LT Type: -25~+70℃)

Filling silicon oil measuring element: -40~+104℃

Filling high temperature oil with flange transmitter: +15~+315℃

Common silicon oil: -40~+149℃

• Static Pressure: 4, 10, 25, 32MPa
• Humidity: Relative humidity 0~100%
• Volume Absorb Quantity: <0.16cm³
• Damping(Step Response): Continually adjustable between 0.2s to 1.67s when filling oil

3. Other Parameters

• Isolation Diaphragm: 316L Stainless Steel, Hastalloy C, Monel or Tantalum
• Venting/Drain Valve: 316L Stainless Steel, Hastalloy C, Monel
• Flange & Joint: 316L Stainless Steel, Hastalloy C, Monel
• Contact Medium O-Ring: Chemigum, Fluorous Rubber
• Filliing Liquid: Silicon Oil or Inert Oil
• Bolt: 316 Stainless Steel
• Electronic Shell Material: Low Copper Aluminum Alloy
• Impulse Connection: Flange 1/4NPT, Center Distance 54mm, Joint 1/2NPT or M20*1.5 Male Thread Ball Cone Seal, Center Distance with Joint 50.8, 54, 57.2mm(NPT Spinal Canal Thread According to GB/T12716-91)
• Signal Wire Connection Hole: G1/2’’, M20*1.5
• Weight: 3.9KG(Standard)

4. Configuration

ML3000W Micro Differential Pressure Transmitter:

The max static pressure is 4MPa, the min measuring range is 0-0.125~1.5KPa.

They can shift to a negative pressure transmitter.

Medium:liquid, gas, steam.

6. Photos

Melan Measurement & Control Instruments is located in Shanghai City. It is a high-tech manufacturer specialized in the design, development, manufacturing and sale of measurement and control instruments.

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