Yokogawa EJA120A Draft Range Differential Pressure Transmitter
Excellent performance and stability
Small lightweight design
Live bus communication capability
Sealing level: IP67, NEMA4X, JISC0920 Waterproof level
Parameter
Conditions for power and load: The power supply voltage is 24V, and the maximum load is 570Ω
Communication interval: Using multi -core twisted wire, the communication interval can reach a maximum of 1.5km, and the communication interval varies from the cable type
Power voltage: 10.5 ~ 30VDC (normal and explosion) 10.5 ~ 30VDC (Ben An, N, or Non -flame) 10.5 ~ 32VDC (with lightning protection) BRAIN and Hart protocol at least 16.4VDC
Sealing level: IP67, NEMA4X, JISC0920 Waterproof level
Communication interval: When using CEV cables, the communication interval can reach 2km. The communication interval varies from cable types
Connect: See the "Type and Standard Code" table to break the process interface and electrical interface process connection scale: DIN192137/16 "-20UNF internal thread
Specifications
| EJA120A Draft Range Differential Pressure Transmitter | ||
| E Capsule | ||
| Range | -1 to 1 kPa(-4 to 4 inH2O) | |
| Span | 0.1 to 1 kPa(0.4 to 4 inH2O) | |
| Accuracy | ±0.2% | |
| 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 | -25 to 80 deg C (-13 to 176 deg F) | |
| Process temperature | -25 to 80 deg C (-13 to 176 deg F) | |
| Maximum working pressure | 50 kPa (7.25 psi) | |
| 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) | |
Specific operation of fine -tuning
Model fine -tuning (sensor fine -tuning): The main work is to fully fine -tuning and minimal fine -tuning. Completely fine -tuning requires three times the accuracy of the transmitter. In the handwaller menu: device settings-> diagnosis and maintenance-> inspection-> lower limit for fine -tuning for operation. If the accuracy of the transmitter is 0.25, the lower -limit fine -tuning value is 0.06. In the process of overall exercise, we only need to follow the instruction operation provided by the hand operator. Then adjust the upper limit sensor at the same position. Note that the upper limit is fine -tuned than the maximum measurement range of the transmitter.
Zero minimum tuning: First of all, the transmitter must be connected with the hand operator and measurement circuit. Then in the device settings-> diagnosis and maintenance-> inspection-> sensor fine -tuning-> zero fine -tuning. Finally, press the prompt of the hander to fine -tune at zero. It should be noted that the transmitter must be fine -tuning within 3%based on zero.
When fine -tuning, we need to turn off the transmitter protection settings. The transmitter protection setting is generally a red switch in front of the head. There are ON and OFF. If the protection function is turned on, fine -tuning will not be successful.
Model fine -tuning (output fine -tuning)
Equipment settings in the hand operator menu-> diagnosis and maintenance-> inspection-> output fine -tuning-> number/modular adjustment. Set the "control loop" to manual way. Then, according to the prompt of "Connection Reference Form", an accurate reference Ampel table is connected to the transmitter. Pay attention to the wiring of both ends, and then select OK. Finally, set the on -site device output to 4mA. At this time, the transmitter output is 4mA. Then record the actual value of the reference table, and input the value in the "Input Instrument Value" prompt to observe that the output of the hand operator is consistent with the reference table value. If it is not consistent, continue to enter the reference value and check whether it is consistent with the output of the hand operator. If consistent, change the 4mA to 20mA and then compare the reference value and the output value of the hand operator. Until accurate. The last step is to set the "control circuit" to automatic control. After completing all operations.
