Diaphragm pressure switch | 1–5 bar | 1–10 bar | 10–20 bar | 20–50 bar | 4A | 250VAC | 42VDC | IP65/67

Technical Specifications

Contact type: SPDT (Single Pole, Double Throw)

Contact material: Silver-cadmium alloy

Housing material: Galvanized steel / Stainless steel / Brass

Maximum operating voltage: 250 VAC / 42 VDC

Maximum current: 4 A

Operating temperature: -40°C ~ +100°C (depending on diaphragm type)

Mechanical durability: 1,000,000 cycles

Electrical durability: 100,000 cycles

Accuracy repeatability: ±2%

IP protection rating: Wires – IP00 / Hirschmann connector – IP65 / Sealed wires – IP67

Compliance standard: EN 60730-1

Maximum working pressure: Galvanized steel / stainless steel – 150 bar; Brass – 40 bar

Burst pressure: Galvanized steel / stainless steel – 300 bar; Brass – 80 bar

Weight: ~140 g

Selectable parameters – determined by order code:
Order code: ESLF727- 1(A) 1(B) 1(C) 1(D) 1(E) 1(F) -3bar

A - Connection (X3):

1. G1/8 male

2. NPT1/8 male

3. M10*1 male

4. UNF7/16 male

5. G1/4 male

6. NPT1/4 male

7. G1/2 male

8. G1/4 female

9. M12*1.5 female

B - Housing material:

1. Galvanized steel

2. Stainless steel

3. Brass

C - Diaphragm:

1. NBR

2. FKM

3. EPDM

4. HNBR

5. VMQ

D - Electrical connections:

1. Flat connector

2. DIN 43650A Pg9

3. DIN 43650A Pg11

4. Resin-coated wires

E - Pressure range:

1. 1–5 bar (±0.3 bar)

2. 1–10 bar (±0.5 bar)

3. 10–20 bar (±1 bar)

4. 20–50 bar (except brass) (±2 bar)

F - Pressure direction:

1. Increasing

2. Decreasing

Functions and Features

SPDT contact system: ensures flexible signal control – suitable for alarms and actuators

High pressure resistance: steel models withstand up to 150 bar (working), 300 bar (burst)

Long lifespan: up to 1 million mechanical cycles

Wide usage: suitable for air and liquids (not for corrosive or chlorine-based media)

Broad temperature range: -40°C to +100°C

Multiple IP ratings: IP00, IP65, or IP67 available

Applications

Fire suppression systems – pressure detection and signaling

Industrial hydraulics – pressure control, pump or valve management

Automotive – oil or air pressure monitoring

Automated lines – device triggering and protection

Alarm systems – triggers audible/visual alarm when limit is reached

Pros

High pressure and temperature resistance

Robust steel or stainless housing

Reliable SPDT contact switching

Long service life

Compact and easy to install

Cons

No digital setting or display

Not for aggressive media (chlorine, acids)

Requires precise calibration on installation

Single pressure setpoint – unsuitable for dynamic systems