Electronic Pressure Switch YX-18

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A mechanical switch gives you one fixed trip point and no way to see the pressure. The YX-18 does the three jobs a modern panel actually needs: it shows the live pressure on a digital display, lets you set two trip points from the buttons without a gauge and a screwdriver, and sends a 4–20 mA analog signal so the same device that switches also reports. That turns one electronic pressure switch into a switch, a gauge, and a transmitter in one body.

Overview

The YX-18 is an electronic, digital pressure switch built around a sensor, a small processor, and a display. It measures across a wide span, up to 60 MPa, holds an accuracy of 0.5% FS, and rates 10 million switching cycles because the outputs are solid-state, not a wearing contact. Two setpoints let it run a pump-and-alarm or lead-lag scheme from a single unit, and the analog output feeds a PLC or recorder in parallel. It runs on 24 VDC and carries an IP65 housing for plant use.

Where the duty is a simple fixed trip with no power and no display, a mechanical model from our pressure switch range is cheaper. For hazardous areas, the explosion-proof YX18-F adds two more setpoints and a flameproof build.

Working principle

A pressure sensor converts the process pressure to an electrical signal. A processor reads it, shows the value on the display, and compares it against the setpoints you entered; when the pressure crosses a point, the matching solid-state output changes state to drive a relay, valve, or alarm. The same reading is scaled to a 4–20 mA analog output that runs continuously, so the unit switches and reports at once. Because the switching is electronic, there is no contact to arc or wear, which is why it is rated for ten million operations.

Technical specifications

Representative specifications; confirm the exact build per datasheet.

Parameter	Specification
Control range	-0.1 to 60 MPa (vacuum, gauge, and compound)
Accuracy	≤ 0.5% FS
Outputs	Two switch points plus one analog signal (4–20 mA)
Switch contact rating	DC 24 V 1.2 A; AC 250 V 3 A (resistive)
Overload capacity	150% of range
Switching cycles	1 x 10^7 (solid-state)
Supply voltage	24 VDC ± 15% (220 VAC optional)
Medium temperature	-30 to +85 °C
Protection	IP65
Display	Digital, with button setting of points

Models and outputs

The YX-18 comes in connection and output variants. Pick by the process thread and how many switch points you need:

Model	Connection	Output
YX18-X	G1/4 (customizable)	Two switches + one analog
YX18-B	M20 x 1.5 (customizable)	Two switches + one analog
YX18-F	M20 x 1.5, explosion-proof	Four switches + one analog

The explosion-proof, four-setpoint version is covered on its own page: the YX18-F explosion proof pressure switch.

Setpoints and analog output

This is where a digital pressure switch pulls ahead of a mechanical one. You set each trip point from the front buttons against the live reading on the display, with no test gauge and no opening the cover, and you set the reset hysteresis for each point separately so neither chatters. Two independent points let one unit run a real scheme: point one starts a pump, point two raises a high alarm, or the pair drives lead-lag on two pumps. Meanwhile the 4–20 mA analog output carries the continuous pressure to a PLC or recorder, so the same device that switches also trends, which a mechanical switch cannot do. For a continuous reading with no switching at all, our pressure transmitters are the dedicated choice.

Applications

The YX-18 suits control that needs setpoints, a reading, and a signal together:

• Pump and compressor control with start, stop, and alarm points
• Hydraulic and pneumatic systems needing a visible set value
• Water and HVAC plant where one unit must switch and report
• Machine builds that monitor pressure on a PLC and trip locally

FAQ

What is a pressure switch used for?

A pressure switch turns an electrical contact on or off when pressure crosses a set point, so it can start or stop a pump, sound an alarm, or interlock a machine without a separate controller. An electronic switch like the YX-18 does this with a digital set point and a display, and it can also send a 4-20 mA signal, so one device both switches and monitors.

Does a pressure switch require power?

A simple mechanical pressure switch needs no power: the process pressure moves the contact directly. An electronic pressure switch like the YX-18 does need a supply, typically 24 VDC, to run its display, its set-point electronics, and its analog output. In return you get adjustable trip points, a clear reading, and repeatable switching a mechanical unit cannot match.

How do you tell if a pressure switch is normally open or closed?

On a mechanical switch you read it from the wiring: normally open (NO) contacts stay open until pressure reaches the set point, normally closed (NC) stay closed until then. The YX-18 is configured electronically, so you choose whether each of its two set points acts as a normally open or normally closed output, and you set the reset (hysteresis) point separately, letting one switch cover both rising and falling alarms.

Request a quote

Tell us five things and we configure one unit, not a shelf part:

• Pressure range and whether it sees vacuum or compound
• Setpoints you need (two, or four on the YX18-F)
• Outputs (switch contacts plus 4–20 mA) and supply
• Process connection (G1/4, M20, or custom)
• Area (standard or hazardous)

Ordering example: YX18-B, range 0–1.6 MPa, two setpoints, 4–20 mA analog, M20 x 1.5, 24 VDC.

Tell us the application and we configure one unit, not a shelf part. Building control we have not listed? Reach our application engineers.