Yokogawa Pressure Transmitters Liquid Level

Inaccurate level measurement can cause a host of problems in your plant:

  • Overflow can cause safety and enviromental problems.
  • Low levels can casue pumping issues or actual pump damage.
  • Incorrect reading can casue poor product quality or plane effeciently.

All these issues have a direct impact on the profitable operation of your plant.

Which Series is Right for You?

EJA-E SeriesEJX-A Series
EJA-E SeriesEJX-A Series
EJA210EEJX210A
Accuracy
± 0.075 of Span
Stability
± 0.1% of URL per 1 year
± 0.1% of URL per 5 years
Response Time
120 msec
750 msec
Diaphragm seal type
Flush Flanged
Extended Flange
Safety Certified
FMEDA Report
IEC 61508 Certified (SIL 2)
Multi-Sensing
Differential Pressure
Static Pressure
  • EJA210E

    EJA210E thumbnailFlange-mounted Differential Pressure Transmitter designed for Liquid-level applications based on the EJA-E series.


  • EJX210A

    EJX210A thumbnailFlanged-mounted Differential Pressure Transmitter designed for Liquid-level applications based on the EJX-A Series.


  • EJXC40A

    EJXC40A thumbnailDigital Remote Sensor (DRS) Transmitter connects two pressure sensors, master (high pressure side) and slave (low pressure side) in a remote location, with DRS dedicated communication cable to measure differential pressure.


  • EJXC80A, EJAC80E (Diaphragm Seal)

    EJXC80A, EJAC80E (Diaphragm Seal) thumbnailDiaphragm Seal System consists of gauge pressure or differential pressure transmitter with one or two diaphragm seal.


  • EJXC80A, EJAC80E (Direct Mounted)

    EJXC80A, EJAC80E (Direct Mounted) thumbnailDirect Mounted Diaphragm Seal System consists of gauge pressure or differential pressure transmitter with single direct mount diaphragm seal.


  • EJXC50A, EJAC50E

    EJXC50A, EJAC50E thumbnailDirect Mounted Diaphragm Seal System consists of gauge pressure or differential pressure transmitter with single direct mount diaphragm seal.

Liquid Level Introduction

Level transmitter configuration can be very time consuming. Calculations required to determine proper range values for traditional transmitters can become complex due to the physical layout of an application.

With maintenance shops getting smaller, finding equipment that allows us to do more with fens becomes a priority. DPharp transmitters with advanced software functionality can eliminate these complex calculations.

Liquid Level Application

Using typical smart or conventional products, all the following must be considered:

The specific gravity of the processSGP
Precise location of 0% and 100%

Specific Gravity of the capillary fill fluid
(or sealing fluid used in impulse piping)

SGFF
Exact orientation oi the transmitter to the vesselH2
Vertical distance between the process conn.H1

Depending on the application, the vessel may be open (referencing atmosphere) or closed (under a blanket pressure).

Elevation is typically used when the vessel is closed. To reference the blanket pressure, a low side remote seal may be used (or a wet leg). The capillary on remote seal creates a negative force on the transmitter equal to the vertical height times the specific gravity of the fill fluid.

Elevation = (H1 + H2) x SGFF

Suppression is a positive pressure created on the high-pressure side of the transmitter typically due to the transmitter being positioned below the 0% process connection. Suppression is present in both open arid closed vessels. Suppression is equal to the vertical distance between the 0% process connection and the transmitter times the Specific Gravity of the fill livid.

Suppression = H2 x SGFF

Span is the vertical distance between the process connections times the process medium’s Specific Gravity.

Span = H1 x SGP

Figure 1: Closed Tank
Figure 1: Closed Tank

Now that you have the ElevationSuppression, and Span, the calibration values can be calculated for the 0% (Empty) arid the 100% (Full).

Cal Value (0%) = Suppression – Elevation

Cal Value (100%) = (Suppression + Span) – Elevation

Example: (using figure 1)

SGP0.9H210 inches
SGFF0.8H120 inches

Cal Value 0%) = Suppression – Elevation
Cal Value (0%) = (H2 x SGFF) – (H1 + H2 x SGFF)
Cal Value (0%) = (10 x 0.8) – (20 + 10) x 0.8
Cal Value (0%) = 8 – 24
Cal Value 0%) = -16 inH2O

Cal Value (100%) = (Suppression + Span) – Elevation
Cal Value (100%) = ((H2 x SGFF) + (H1 x SGP)) – (H1 + H2) x SGFF
Cal Value (100%) = ((10 x 0.8) + (20 x 0.9)) – (20 + 10) x 0.8
Cal Value (100%) = (8 + 18) – 24
Cal Value (100%) = +2 inH2O

Therefore, Calibrated Range would be:

-16 inH2O +2 inH2O
0%100%
EmptyFull

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