PLCs, Power Supplies & Others

Product Overview

The EJA110A S1 measures differential pressure with high precision using resonant silicon sensor technology. This transmitter delivers reliable performance for flow, level, and density measurement applications. Process plants depend on this instrument for accurate pressure monitoring in demanding environments. The EJA110A S1 features advanced digital compensation to ensure long-term stability and repeatability.

Key Specifications

Measurement Performance and Sensor Technology

The EJA110A S1 employs Yokogawa’s resonant silicon sensor for exceptional measurement accuracy. This sensor detects pressure-induced frequency changes in vibrating silicon structures for direct digital output. The transmitter achieves an accuracy of ±0.1% of span across its calibrated range. Long-term stability remains within ±0.1% per year, which reduces recalibration frequency significantly. The device also features a fast response time of 120 ms with damping applied.

Pressure Range and Overload Capability

This differential pressure transmitter covers a measurement range from 0.1 to 100 kPa (0.4 to 400 inH₂O). The EJA110A S1 withstands a static pressure limit of 16 MPa without damage or performance degradation. Such high overpressure capability ensures reliable operation during process upsets and startup conditions. The transmitter resists the effects of pressure spikes due to its robust sensor design and construction.

Output and Communication Interface

The EJA110A S1 provides a standard 4–20 mA analog output with superimposed HART digital communication. This two-wire loop-powered transmitter operates from a 17 to 42 V DC power supply. At 24 V DC, the device drives a load resistance of up to 600 Ω for flexible integration. Maintenance personnel can configure parameters and perform diagnostics through the HART interface. The transmitter also supports remote zero and span adjustments for convenient calibration.

Process Connections and Wetted Materials

Standard process connections include 1/2 NPT female threads for universal compatibility. The EJA110A S1 also offers Rc 1/2 connections as an alternative option. Wetted parts feature 316L stainless steel with a Hastelloy C-276 diaphragm for excellent corrosion resistance. The transmitter uses silicone oil as the standard fill fluid for reliable pressure transmission. Alternate fill fluid options are available for oxygen service and other special applications.

Environmental Tolerance and Enclosure

The EJA110A S1 operates reliably across temperatures from -40°C to 85°C in process environments. Ambient temperature variations produce only ±0.05% effect per 10°C on measurement accuracy. The aluminum housing carries an IP67 and NEMA 4X rating for dust and water ingress protection. This rugged enclosure makes the transmitter suitable for outdoor installations and washdown areas. Storage temperatures from -50°C to 90°C do not affect the instrument’s long-term integrity.

Physical Dimensions and Weight

The transmitter housing measures 190 mm in height, 110 mm in width, and 140 mm in depth. The EJA110A S1 weighs 3.8 kg without the optional mounting bracket assembly. The electrical connection accommodates 1/2 NPT or M20 × 1.5 cable glands for flexible wiring. Installers can mount the device directly onto pipe stands or wall brackets.

Application Suitability

The EJA110A S1 suits flow measurement using orifice plates, nozzles, and Venturi tubes. This transmitter also performs level measurement in closed tanks using hydrostatic pressure methods. Density and interface measurement applications benefit from the unit’s high accuracy and stability. The transmitter handles liquids, gases, and steam across various industrial processes. Its digital sensor technology provides reliable performance in harsh chemical and petrochemical environments.

Installation and Maintenance Guidance

Mount the EJA110A S1 vertically or horizontally with the process connections facing downward. Connect the impulse piping to the high and low pressure ports using appropriate fittings. Wire the two-wire loop to the terminal block, observing correct polarity. Configure the zero and span values using the HART communicator or configuration software. Perform routine zero checks to verify measurement integrity over time. The transmitter requires minimal maintenance due to its solid-state sensor design.

Details