Yokogawa Absolute Pressure Transmitter EJA310
Introduction
The high performance gauge pressure transmitter model EJA310A can be used to measure liquid, gas,or steam pressure. It outputs a 4 to 20 mA DC signal corresponding to the measured absolute pressure.
Model EJA310A also features remote setup and monitoring through communications with the BRAIN™
terminal and CENTUM-CS™ or XL™ or HART® 275 host.
Feature
Functional specifications
1)Zero Adjustment Limits
Zero can be fully elevated or suppressed, within the Lower and Upper Range Limits of the capsule.
2)External Zero Adjustment
External zero is continuously adjustable with 0.01 % incremental resolution of span. Span may be
adjusted locally using the digital indicator with range switch.
3)Mounting Position Effect
Rotation in diaphragm plane has no effect. Tilting up to 90° will cause zero shift up to 0.4 kPa {1.6 inH2O}
which can be corrected by the zero adjustment.
4)Output
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.
5)Failure Alarm
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-2.5%, 3.6 mA DC or less (Optional code /F1)
Note: Applicable for Output signal code D and E
6) Damping Time Constant (1st order)
The sum of the amplifier and capsule damping time constant must be used for the overall time constant.
Amp damping time constant is adjustable from 0.2 to 64 seconds.
| specification |
EJA310A Absolute Pressure Transmitter |
| L Capsule |
M Capsule |
A Capsule |
| Range |
0 to 10 kPa abs |
0 to 130 kPa abs |
0 to 3 MPa |
| (0 to 2.95 inHg abs) |
(0 to 38 inHg abs) |
(0 to 430psia) |
| Span |
0.67 to 10 kPa |
1.3 to 130 kPa |
0.03 to 3 MPa |
| (0.2 to 2.95 inHg) |
(0.38 to 38 inHg) |
(4.3 to 430 psi) |
| Accuracy |
±0.2% |
±0.15% |
±0.15% |
| Degrees of protection |
IP67, NEMA 4X, and JIS C0920 immersion proof |
| Certificates |
FM, CENELEC ATEX, CSA, IECEx |
| Output |
4 to 20 mA DC or FOUNDATION™ fieldbus or PROFIBUS PA 2-wire system with digital communication |
| Supply voltage |
BRAIN and HART:10.5 to 42 V DC (10.5 to 30 V DC for Intrinsically safe type) |
| Fieldbus:9 to 32 V DC (9 to 24 V DC for Entity model and 9 to 17.5 V DC for FISCO model) |
| Ambient temperature |
-40 to 85 deg C (-40 to 185 deg F) (general use type) |
| -30 to 80 deg C (-22 to 176 deg F) (with integral indicator) |
| Process temperature |
-40 to 120 deg C (-40 to 248 deg F) (general use type) for M and A capsule |
| -40 to 100 deg C (-40 to 212 deg F) (general use type) for L capsule |
| Maximum overpressure |
500 kPa abs |
500 kPa abs |
4.5 MPa abs |
| (72psia) |
(72psia) |
(645psia) |
| Mounting |
2-inch pipe mounting |
| Wetted parts material |
Capsule |
SUS316L (Diaphragm material is Hastelloy C-276) |
| Cover flange |
SUS316 |
| Housing |
Cast aluminum alloy or SUS316 equivalent stainless steel (optional)
|
