Name: EJXC80A, EJAC80E Differential / Gauge Pressure Diaphragm Seal System
Brand: Yokogawa
SKU: ejxc80a-ejac80e-diaphragm-seal

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The EJXC80A and EJAC80E Diaphragm Seal Systems consist of gauge pressure or differential pressure transmitters with one or two diaphragm seals.

What Are the Benefits of Diaphragm Seal Systems?

Diaphragm Seal Systems can measure high/low temperature fluids, highly corrosive/high viscosity fluids, fluids that may cause clogging of impulse piping in low temperatures, and toxic fluids.

How Are Diaphragm Seal Systems Built?

Compensation capillary type has a compensating capillary to help balance the volume and temperature of the fill fluids between high and low pressure side capillaries. This solution reduces the influence of ambient temperature drift whether it is caused by swings day-to-night, season-to-season, or shady-to-sunny.

This compensation capillary is attached to the high pressure side of the transmitter and runs along the low-pressure capillary. It is actually bundled to it. This allows the volume of fill fluid to be the same between the two sides of the transmitter and allows for ambient temperature balance between them.

Ambient Temperature Drift

Ambient temperature is the temperature around the process. If the tank is located outdoors, the transmitter and capillary system could see temperature swings day-to-night, season-to-season, or even shady-to-sunny. This change in temperature affects the fill fluid just like any liquid. The fluid contracts and expands within the capillary with the change. This can cause inaccuracy in the reading. The reading reflects a change in the fill fluid instead of an actual change in the level.

Ambient Temperature Compensation capillary type Level Transmitter

Comparison Data

Following data shows the effect of temperature drift due to sunshine on both the compensation-type and standard-type differential pressure transmitters. The effect of sunlight was simulated by changing the temperature only within the area extending 50cm from the end of the capillary tube and the diaphragm seal on the low pressure side.
When the temperature of the low pressure side rose by 50ºC, the output of the standard-type increased by 14.0% in the 10 kPa measurement range. Meanwhile, the output of the Compensation-type increased by only 0.8%, which is 13.2% difference of the change in the standard-type.

Comparison data

Remote Mount Flanged Diaphragm Seal System

EJXC80A Differential Pressure Remote Mount Flanged Diaphragm Seal System

		Measurement Span	Range
M		2 to 100 kPa	−100 to 100 kPa
H		10 to 500 kPa	−500 to 500 kPa
V	Flush type	0.28 to 14 MPa	−0.5 to 14 MPa
V	Extended type	0.28 to 7 MPa	−0.5 to 7 MPa

EJAC80E Differential Pressure Remote Mount Flanged Diaphragm Seal System

		Measurement Span	Range
M		2.5 to 100 kPa	−100 to 100 kPa
H		25 to 500 kPa	−500 to 500 kPa
V	Flush type	0.28 to 14 MPa	−0.5 to 14 MPa
V	Extended type	0.28 to 7 MPa	−0.5 to 7 MPa

EJXC80A Gauge Pressure Remote Mount Flanged Diaphragm Seal System

		Measurement Span	Range
A		0.035 to 3.5 MPa	−0.1 to 3.5 MPa
B	Flush type	0.16 to 16 MPa	−0.1 to 16 MPa
B	Extended type	0.16 to 7 MPa	−0.1 to 7 MPa

EJAC80E Gauge Pressure Remote Mount Flanged Diaphragm Seal System

		Measurement Span	Range
A		0.06 to 3.5 MPa	−0.1 to 3.5 MPa
B	Flush type	0.46 to 16 MPa	−0.1 to 16 MPa
B	Extended type	0.46 to 7 MPa	−0.1 to 7 MPa

Item	Specifications
Applicable Products (transmitter)	Differential Pressure Transmitter: EJX110A, EJA110E Gauge Pressure Transmitter: EJX430A, EJA430E
Process connection size	Flush Flanged Seal 1 1/2-inch (40 mm), 2-inch (50 mm), 3-inch (80 mm) Extended Flanged Seal 3-inch (80 mm), 4-inch (100 mm) Inner Diaphragm Seal, Adapter Connection Type 1/2-inch (15 mm), 3/4 inch (20 mm), 1-inch (25 mm) Inner Diaphragm Seal, Flange Connection Type 1/2-inch (15 mm), 3/4 inch (20 mm), 1-inch (25 mm)