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Multi-Variable Differential Pressure Transmitter

The ALDP-MV measures three separate process variables simultaneously and provides dynamic calculation of fully compensated mass flow rate for steam and liquids as well as standard volume flow for gases. It measures differential pressure and absolute pressure from a single sensor and process temperature from a standard PT 100 Resistance Temperature Detector (RTD). Flow calculation includes compensation of pressure and/or temperature as well as more complex variables such as discharge coefficient, thermal expansion, Reynolds number and compressibility factor. The ALDP-MV includes flow equations for steam, gases and liquids so that one model is all you need in your system. It can also measure static pressure with either integral or remote electronics and has an optional HART output. Many plants calculate mass flow in a host computer using a simplified mass flow equation. The ALDP-MV provides full compensation of over 25 different parameters to achieve a 5X improvement in flow performance compared to uncompensated DP flow. The ALDP-MV is ideally suited to work with SMC's ACONE primary flow elements.

Differential Pressure Measuring Range 0~200Pa to 0~2000 kPa
Absolute Pressure Measuring Range up to 40 MPa
Fluid Media liquid, gas and steam
Temperature –50 ~ 650 °C
Response Time 0.1 sec
Accuracy Grades 0.075, 0.2, 0.5 of reading
Turn-down 100:1
Sensor damping 0.1~1.6 sec
Amplifier damping 0 to 60 seconds adjustable
Drift (Micro) 0.1%FS/3 years
Process Connection Flange with ⁷⁄₁₆ -20 UNF mounting threads and ¼-18 NPT female ports on both sides
Weight 3.5 kg
Relative humidity 0 ~ 100% RH
Sensor Body and Flange Materials SS #316L
Power Supply 24 VDC supply, R≤(Vs-12V)/Imax kΩ, Imax=23 mA / Max. Voltage to 42VDC, Min. to 12VDC; 15VDC(with display) / 230Ω to 600Ω for digital communication
Fill Fluid Silicone oil/Fluorinated oil
Diaphragm Materials 316L stainless steel / Hastelloy C / Gold plated on 316L / EFP plated on 316L / Tantalum
Nuts & Bolts Materials SS# 304
Process Connection Materials SS #316
Storage Temperature -20 ~ 85 °C
O-ring Perbunan(NBR) / Viton (FKM) / Teflon(PTFE)
Electrical Enclosure Materials Aluminum with epoxy resin coat; gasket: Perbunan (NBR)
Approvals Isolated explosion ExdIIBT5 or ExdIICT6
Output Signals 4~20 mADC , MODBUS, HART
Protection IP 67
Related Files:
Metric Catalog
  • Multi-parameter capablity in a single transmitter – up to three measured values
  • May be used for level and flow measurement of gas, liquid and steam
  • Modular: interchangeable electronics with self-reconfiguration
  • Advanced diagnostics capabilities
  • Dynamic flow correction with continuous calculation of Reynolds's number and flow
  • Displays process value(s) and alarm status
  • Mass and standard volume flow in accordance with AGA 3 or DIN EN ISO 5167
  • Convenient; configurable via local operating keypad
  • Linearization of the primary elements
  • Analog 4~20 mA DC two wire linear output
  • HART protocol

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