YOKOGAWA EJA110E Diff erential Pressure Transmitter

The high performance diff erential pressure transmitter

EJA110E features single crystal silicon resonant

sensor and is suitable to measure liquid, gas, or

steam fl ow as well as liquid level, density and

pressure. EJA110E outputs a 4 to 20 mA DC signal

corresponding to the measured diff erential pressure.

Its accurate and stable sensor can also measure the

static pressure which can be shown on the integral

indicator or remotely monitored via BRAIN or HART

communications. Other key features include quick

response, remote set-up using communications and

self-diagnostics. FOUNDATION Fieldbus, PROFIBUS

PA and 1 to 5 V DC with HART (Low Power) protocol

types are also available. EJA-E series models in

their standard confi guration, with the exception of

the Fieldbus, PROFIBUS and Low Power types,

are certifi ed as complying with SIL 2 for safety

requirement.

 STANDARD SPECIFICATIONS

Refer to GS 01C31T02-01EN for Fieldbus

communication type and GS 01C31T04-01EN for

PROFIBUS PA communication type for the items

marked with “◊.”

□ PERFORMANCE SPECIFICATIONS

Zero-based calibrated span, linear output, wetted

parts material code S and silicone oil, unless

otherwise mentioned.

For Fieldbus and PROFIBUS PA communication

types, use calibrated range instead of span in the

following specifi cations.

Specifi cation Conformance

EJA-E series ensures specifi cation conformance to at

least ±3σ.

Reference Accuracy of Calibrated Span

(includes terminal-based linearity, hysteresis, and

repeatability)

□ FUNCTIONAL SPECIFICATIONS

Output “◊”

For 4 to 20 mA HART / BRAIN

(Output signal code D and J)

Two wire 4 to 20 mA DC output with digital

communications, linear or square root programmable.

BRAIN or HART FSK protocol are superimposed on

the 4 to 20 mA signal.

Output range: 3.6 mA to 21.6 mA

Output limits conforming to NAMUR NE43 can be

pre-set by option code C2 or C3.

For 1 to 5 V HART

(Output signal code Q)

Three or four wire low power 1 to 5 V DC output with

HART, linear or square root programmable.

HART protocol are superimposed on the 1 to 5 V DC

signal.

Output range: 0.9 V to 5.4 V DC

Failure Alarm

For 4 to 20 mA HART / BRAIN

(Output signal code D and J)

Analog output status at CPU failure and hardware

error;

Up-scale: 110%, 21.6 mA DC or more (standard)

Down-scale: −5%, 3.2 mA DC or less

For 1 to 5 V HART

(Output signal code Q)

Analog output status at CPU failure and hardware

error;

Up-scale: 110%, 5.4 V DC or more (standard)

Down-scale: −5%, 0.8 V DC or less

Damping Time Constant (1st order)

Amplifier damping time constant is adjustable from

0.00 to 100.00 s by software and added to response

time.

Note: For BRAIN protocol type, when amplifier software

damping is set to less than 0.5 s, communication

may occasionally be unavailble during the

operation, especially while output changes

dynamically. The default setting of damping

ensures stable communication.

Update Period “◊”

Differential pressure: 45 ms

Static pressure: 360 ms

Zero Adjustment Limits

Zero can be fully elevated or suppressed, within the

lower and upper range limits of the capsule.

External Zero Adjustment

External zero is continuously adjustable with

0.01% incremental resolution of span. Re-range

can be done locally using the digital indicator with

rangesetting switch.

Integral Indicator (LCD display, optional) “◊”

5-digit numerical display, 6-digit unit display and bar

graph.

The indicator is configurable to display one or up to

four of the following variables periodically.;

Measured differential pressure, differential pressure

in %, scaled differential pressure, measured static

pressure. See also “Factory Setting.”

Local Parameter Setting

(Output signal code D, J and Q)

Parameter configuration by the external zero

adjustment screw and push button (Integral indicator

code E) offers easy and quick setup for parameters

of Loop test, Tag number, Unit, LRV, URV, Damping,

Output mode (linear/square root), Display out 1. and

Re-range by applying actual pressure (LRV/URV)

and Device Information.

Burst Pressure Limits

69 MPa (10.000 psi) for wetted parts material S,

except for Measurement span F.

47 MPa (6.800 psi) for wetted parts material other

than S or Measurement span F.

Self Diagnostics

CPU failure, hardware failure, configuration error,