Yokogawa Absolute Pressure Transmitter

Yokogawa’s Absolute pressure transmitters are available in traditional mount and in-line configurations. Both configurations offer accurate repeatable readings.

Since this type of transmitter references absolute zero pressure, their output will not be affected by changes in local atmospheric pressure.

Our Main Business on :EJA310E EJX310A EJA510E EJX510A EJX610A…All the Yokogawa Absolute Pressure Transmitter we sell Made in Japan! 100% Original!

  • EJA310E

    EJA310E thumbnailTraditional-mount Absolute Pressure Transmitter based on the EJA-E Series.


  • EJX310A

    EJX310A thumbnailTraditional-mount Absolute Pressure Transmitter based on the EJX-A Series.


  • EJA510E

    EJA510E thumbnailIn-Line Mount Absolute Pressure Transmitter based on the EJA-E Series.


  • EJX510A

    EJX510A thumbnailIn-Line Mount Absolute Pressure Transmitter based on the EJX-A Series.


  • EJX610A

    EJX610A thumbnailHigh Performance In-Line Mount Absolute Pressure Transmitter based on the EJX-A Series.

Which Series is Right for You?

EJA-E SeriesEJX-A Series
EJA-E SeriesEJX-A Series
Accuracy
± 0.04%
± 0.055%
± 0.075%
± 0.10%
± 0.15%
± 0.20%
Stability
± 0.2% of URL per 10 years
± 0.2% of URL per 7 years
± 0.1% of URL per 1 year
Response Time
90 msec
450 msec
Mounting
Traditional-mount
In-line Mount
Safety
FMEDA Report
IEC 61508 Certified (SIL 2)
Specification Conformance
±3σ

Yokogawa Absolute Pressure 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.

Yokogawa Absolute Pressure 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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