YOKOGAWA EJA110E Diff erential Pressure Transmitter

YOKOGAWA EJA110E Diff erential Pressure Transmitter

Product Core Overview

1. Core functions and applications

Measurement object: It can accurately measure the flow rate of liquids, gases, and vapors, as well as the liquid level, density, and pressure.

Signal output: default output 4-20mA DC analog signal, and supports BRAIN/HART digital communication overlay; There are also FOUNDATION Fieldbus, PROFIBUS PA, and 1-5V DC (low-power HART) protocols available.

Additional functions: capable of synchronously measuring static pressure, static pressure data can be displayed on integrated indicators or remotely monitored through communication; Equipped with fast response, remote parameter setting, and self diagnostic functions, some models (except for Fieldbus, PROFIBUS, and low-power models) comply with SIL 2 safety certification, and dual transmitter configuration can meet SIL 3 requirements.

2. Core Technology Highlights

Adopting monocrystalline silicon resonant sensors, it combines high precision and stability, can adapt to complex industrial environments, and supports multiple communication protocols and security certifications, adapting to industrial scenarios with different security levels.

Standard specifications

1. Range and span limitations (differentiated by capsule type)

Different capsule types (F, L, M, H, V) correspond to different measurement spans and ranges, covering multiple pressure units (kPa, inH ₂ O, mbar, mmH ₂ O, kgf/cm ², MPa, psi, bar). The following are examples of key parameters:

Capsule type applicable scenarios span range (example: kPa) range range (example: kPa)

F Wet end Material Code S Special 0.5-5-5

L Wet end material code is not S specific 0.5-10-10

M universal medium and low voltage 1-100-100-100

H medium high voltage 5-500-500-500

V high pressure 0.14-14MPa (140-14000kPa) -0.5-14MPa (-500-14000kPa)

2. Performance specifications

(1) Benchmark accuracy (including linearity, hysteresis, and repeatability)

Accuracy calculation is divided into two scenarios: "X ≤ span" and "X>span" (where X is a specific pressure threshold, such as F capsule X=2kPa). The accuracy formula varies for different capsule types, as shown in the following example:

Capsule type X threshold (kPa) accuracy formula (X ≤ span) accuracy formula (X>span)

F 2 ± 0.055% span ± (0.005+0.02 x URL/span)% span

M 5 ± 0.055% span ± (0.005+0.0025 x URL/span)% span

H 100 ± 0.055% span ± (0.005+0.01 x URL/span)% span

V 1400 (1.4MPa) ± 0.055% span ± (0.005+0.005 × URL/span)% span

Note: URL is the upper limit range value, such as F capsule URL=5kPa

If the/HAC high-precision option is specified, the accuracy of some capsules (M, H, V) can be improved. For example, when M capsule X ≤ span, the accuracy can reach ± 0.04% span.

(2) Comprehensive error index

Total possible error (M capsule): Considering the benchmark accuracy (E1), environmental temperature influence (E2, every 28 ℃ change), and static pressure span influence (E3, every 6.9MPa change), the formula is ± E 12+E 22+E 32, and the span is ± 0.20% under the range ratio of 1:1 to 5:1.

Total accuracy (M capsule): additionally taking into account the effects of static pressure zero point (E4) and overpressure (E5), the formula is ± E 12+E 22+(E 3+E 4) 2+E 52, with a span of ± 0.17% under a 1:1 range ratio and ± 0.33% under a 5:1 range ratio.

(3) Other environmental impacts

Temperature effect: For every 28 ℃ change, the F capsule error is ± (0.08% span+0.18% URL), and the M/H/V capsule error is ± (0.07% span+0.02%/0.015%/0.03% URL).

Static pressure effect: For every 6.9MPa change, the span error of all capsules is ± 0.1% span; Zero point error F capsule ± (0.04% span+0.208% URL), M/H/V capsule ± 0.028% URL.

Stability: M/H/V capsules have a ± 0.1% URL every 10 years, while F capsules have a ± 0.2% URL every year.

Functional specifications

1. Signal output and alarm

Output type, signal range, fault alarm mode

4-20mA HART/BRAN 3.6-21.6mA upper limit alarm: ≥ 21.6mA (110%), lower limit alarm: ≤ 3.2mA (-5%)

1-5V HART (low power consumption) 0.9-5.4V upper limit alarm: ≥ 5.4V (110%), lower limit alarm: ≤ 0.8V (-5%)

2. Operation and monitoring functions

Damping time: 0.00-1000s software adjustable, please note that damping<0.5s under the BRAN protocol may affect communication stability.

Integrated indicator (optional): 5-digit numerical display+6-digit unit display+bar chart, can cyclically display differential pressure, differential pressure percentage, scale differential pressure, and static pressure.

Self diagnosis: It can detect CPU faults, hardware faults, configuration errors, differential pressure/static pressure/capsule temperature exceeding the range, and supports user-defined differential pressure/static pressure high and low alarms.

Physical and Environmental Specifications

1. Material

Wet end materials: distinguished by codes (S, L, H, M, T, A, D, B, W), such as S code containing ASTM CF-8M flange and Hastelloy C-276 diaphragm; Sealing gaskets are commonly made of PTFE or fluororubber.

Non wetted material: The shell is made of low copper cast aluminum alloy (optional stainless steel), coated with polyester powder (mint green) or epoxy polyurethane (optional), and the bolts are made of B7 carbon steel, 316L stainless steel, etc.