Diaphragm seals are used to prevent process medium form entering
directly into the pressure-sensing assembly of the differential
pressure transmitter, they are connected to the transmitter using
capillaries filled with fill fluid.
EJA118E Diaphragm Sealed Differential Pressure Transmitters can be
used to measure liquid, gas, or steam flow, as well as liquid
level, density, and
pressure. EJA118E outputs a 4 to 20 mA DC signal corresponding to
the measured differential pressure.
Its highly 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 configuration, with the exception of the Fieldbus,
PROFIBUS and Low Power types, are certified as complying with SIL 2
for safety requirement.
PERFORMANCE SPECIFICATIONS
Zero-based calibrated span, linear output, wetted parts material
code SW for 3-inch flange flush type, fill fluid code B, and
capillary length of 5 m.
For Fieldbus and PROFIBUS communication types, use caribrated range
instead of span in the following specifications.
Specification Conformance
EJA-E series ensures specification conformance to at least ±3σ.
Static Pressure Effects per 0.69 MPa (100 psi) Change
Span Effects
M and H capsules
±0.02% of span
Effect on Zero
M and H capsules
±0.014% of URL
Power Supply Effects(Output signal code D and J)
±0.005 % per Volt (from 21.6 to 32 V DC, 350Ω)
Response Time (Differential pressure) “◊”
M and H capsule: 200 ms (approximate value at normal temperature)
When software damping is set to zero and including dead time of 45
ms (nominal)
Static Pressure Signal Range and Accuracy (For monitoring via
communication or on indicator. Includes terminal-based linearity,
hysteresis, and repeatability)
Range
Upper Range Value and Lower Range Value of the statice pressure can
be set in the range between 0 and Maximum Working Pressure (MWP*).
The upper range value must be greater than the lower range value.
Minimum setting span is 0.5 MPa (73 psi).
* : Maximum Working Pressure (MWP) is within
flange rating pressure.
Accuracy
Absolute Pressure
1 MPa or higher: ±0.5% of span
Less than 1 MPa: ±0.5%×(1 MPa/span) of span Gauge Pressure
Reference
Gauge pressure reference is 1013 hPa (1 atm)
Note: Gauge pressure variable is based on the above fixed reference
and thus subject to be affected by the change of atomospheric
pressure.
□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 conform to NAMUR NE43 can be preset 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)
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
| Code | Process temperature*1 | Ambient temperature*2 | Working pressure | Specific gravity*3 |
Silicone oil (general use) | A | –10 to 250°C *4 (14 to 482°F) | –10 to 60°C (14 to 140°F) |
2.7 kPa abs (0.38 psi abs) to flange rating pressure | 1.07 |
Silicone oil (general use) | B | –30 to 180°C (–22 to 356°F) | –15 to 60°C (5 to 140°F) | 0.94 |
Silicone oil (high temperature use) | C | 10 to 310°C (50 to 590°F) | 10 to 60°C (50 to 140°F) | 1.09 |
Fluorinated oil (oil-prohibited use) |
D | –20 to 120°C (–4 to 248°F) | –10 to 60°C (14 to 140°F) | 51 kPa abs (7.4 psi abs) to flange rating pressure |
1.90 to 1.92 |
Ethylene glycol (low temperature use) |
E | –50 to 100°C (–58 to 212°F) | –40 to 60°C (–40 to 140°F) | 100 kPa abs (atmospheric pressure) to flange pressure rating |
1.09 |
Silicone oil (high temp. and high vacuum use) |
1 | –10 to 250°C *4 (14 to 482°F) | –10 to 60°C *5 (14 to 140°F) |
0.013 kPa abs (0.0019 psi abs) to flange rating pressure |
1.07 |
Silicone oil (high temp. and high vacuum use) |
2 | 10 to 310°C (50 to 590°F) | 10 to 60°C *5 (50 to 140°F) |
1.09 |
Silicone oil (high vacuum use) | 4 | –10 to 100°C (14 to 212°F) | –10 to 60°C *5 (14 to 140°F) | 1.07 |