Views: 1 Author: Site Editor Publish Time: 2021-10-19 Origin: Site
Today, I will give you a brief introduction to a 120E differential pressure transmitter among Yokogawa EJA transmitters. This is a high-performance differential pressure transmitter using single crystal silicon resonant sensor technology, which is suitable for measuring liquids. , Gas or steam flow, liquid level, density and pressure. EJA120E converts the measured differential pressure into a 4 ~ 20 mADC current signal output, with fast response, remote setting and self-diagnosis functions. EJA-E series products provide BRAIN, HART/HART (1~5V) low power consumption, FF fieldbus and PROFIBUS PA communication protocol, and the standard configuration has passed SIL 2 safety certification.
Ambient temperature influence/289C (50* F)+(0.15% range+0.2%URL)
Power influence (output code D &J)
+0.005 %/V (21.6 ~32 V DC, 3502)
Amplifier codes 1 and 3:
When testing according to the requirements of IEC607 70-1 high vibration level (10-60 Hz amplitude 0.21 mm/60-2000 Hz 3 g), <0.1% URL amplifier code 2: according to IEC607 70-1 low vibration level (10-60Hz , Amplitude 0.15m/60-500 Hz 2g) when testing, <+0. I%URL
Influence of installation location
Rotating parallel to the diaphragm surface has no effect. A 90-degree tilt will cause a zero drift of 0.4kPa (1.6inH2O), which can be corrected by zero adjustment.
Response time (differential pressure) "0"
4~20mA HART/BRAIN (output signal code D&J) Two-wire system with digital communication, 4~20mA DC output, can be set to linear or square root. BRAIN or HART FSK protocol is loaded on 4~-20mA signal, output range: 3.6mA~21.6mA.
If you need to comply with NAMUR NE43, you can pre-set the output limit through the option code C2 or C3. 1~5V HART (output signal code 0) Three-wire or four-wire 1~5V low power consumption type can be set linear or square root. HART protocol is loaded on the 1~5V signal, the output range is 0.9 -5.4VDC
Fault alarm (output signal code D& J)
4~ 20mA HART /BRA IN (output signal code D&J) The analog output status when CPU failure and hardware error occur: high output: 110%, 221.6mADC (standard) low output: -5%, ≤ 3.2mA DC1~5V HART (Output signal code 0)
Analog output status when CPU failure and hardware error occur: high output: 110%, 25.4V DC (standard) low output: -5%, ≤0.8V DC
Damping time constant
The damping time constant of the amplifier can be adjusted in the range of 0.00~100.00 s through the software, and the response time will increase accordingly.
Refresh time "V"
Differential pressure: 45 ms
Within the upper and lower limits of the diaphragm, the zero point can be adjusted arbitrarily.
External zero adjustment
The zero can be adjusted continuously within the range with a resolution of 0.01%, and the range can be adjusted using the range setting switch on the meter head. Built-in display meter (LCD display, optional) "V0" 5-digit display, 6-digit unit display and histogram. The display meter can periodically display the following 1~3 variables: measured differential pressure value, differential pressure percentage, and scale differential pressure. See "Factory settings". Local parameter setting (output signal code D, J&Q) through external zero adjustment screw and button switch (built-in display meter code E), providing simple and fast parameter setting, such as: position number, range unit, LRV. URV. damping time, Output mode, display output 1, etc.
CPU failure, hardware failure, configuration error, and over-limit error of differential pressure and diaphragm temperature. The user can configure the differential pressure high/low alarm. Signal curve (output signal code is D, J&Q) can be set to 10 segments of signal curve to characterize 4-20mA output, used for measurement
Measure the level of boiler steam drum, cone tank, etc.
EJA-E series transmitters, except FF fieldbus, PROFIBUS PA and HART low power consumption type, all meet the following standards:
IEC 61508:2000; Part 1~Part 7 Functional safety of electrical/electronic programmable electronic related systems; the station complies with SIL 2 safety requirements, and redundant use complies with SIL 3 safety requirements.
0 Normal operating conditions
-25~ 809C(-13~ 176°F)
Working pressure (silicone oil)
-50 ~50kPa (-7.25~ 7.25 psi)
Power & load requirements
(Output signal code D &J)
When the power supply voltage is 24V DC, the maximum load is 55092,