WIKA · Pressure measurement · Family PSM
Pressure switch, heavy-duty version
For superior industrial applications
Range
-1…30 bar
Accuracy
≤ 1 % of span
Protection
IP67
RoHSCELow Voltage Directive
Price
On request
Depends on configuration
Description
The PSM-550 is used in industrial control, monitoring and alarm applications.
The switch point can be be specified by the customer on site.
The instrument can switch electrical loads of up to AC 230 V, 10 A.
The PSM-550 pressure switch offers many application possibilities with non-corrosive media like oil, water and air.
∙ 04/2026
Pressure switch, heavy-duty version, model PSM-550
Special features
- Non-repeatability ≤ 1 %
- Setting ranges for vacuum, +/- and gauge pressure
Identification
| Model | PSM-550 |
| Product family | PSM |
| Subcategory | Pressure switch |
Measuring range
| Pressure ranges | 0…300 mbar · 0.1…1.1 bar · 0.2…3 bar · 0.2…6 bar · 1…10 bar · 2…17 bar · 4…17 bar · 10…30 bar · -1…0 bar · -0.8…5 bar |
Accuracy
| Accuracy class | ≤ 1 % of span |
| Accuracy standard | BS 6134 |
Process conditions
| Process connection | G ⅜ BG 3/8 B |
| Process temperature | −20…+170 °C |
Electrical characteristics
| Electrical connection | Cable gland ½ NPT |
| Switching function | Adjustable switch differential (hysteresis) |
| Switching contacts | 1 |
Materials
| Wetted parts material | Stainless steel 1.4401, Free cutting steel EN1A, tin-plated, Copper alloy CuSn6, NBR, Bellow, copper alloy CuSn6, Copper alloy, Bellow, stainless steel 1.4401, Diaphragm, NBR |
| Sealing material | NBR |
Operating environment
| Ambient temperature | −40…+70 °C |
| IP rating | IP67 |
| Weight | 1.2 kg |
Certifications and approvals
| Certifications | RoHSCELow Voltage Directive |
Additional details
| Datasheet languages | EN |
Tables from datasheet
| Unit | Setting range 1) | Permissible switch point on rising pressure | Permissible switch point on falling pressure | Adjustable switch differential 2) | Max. working pressure depending on measuring element | ||
|---|---|---|---|---|---|---|---|
| Bellow, copper alloy | Bellow, stainless steel | Diaphragm, NBR | |||||
| mbar | 0 ... 300 | 10 ... 300 | 0 ... 250 | 10 ... 50 | - | - | 500 |
| bar | 0.1 ... 1.1 | 0.17 ... 1.1 | 0.1 ... 0.94 | 0.07 ... 0.16 | 7 | 7 | - |
| 0.2 ... 3 | 0.32 ... 3 | 0.2 ... 2.25 | 0.12 ... 0.75 | 7 | 7 | - | |
| 0.2 ... 6 | 0.45 ... 6 | 0.2 ... 4.8 | 0.25 ... 1.2 | 15 | 25 | - | |
| 1 ... 10 | 1.3 ... 10 | 1 ... 8.7 | 0.3 ... 1.3 | 16 | 25 | - | |
| 2 ... 17 | 2.3 ... 17 | 2 ... 15 | 0.3 ... 2 | - | 25 | - | |
| 4 ... 17 | 5.2 ... 17 | 4 ... 13 | 1.2 ... 4 | 25 | 25 | - | |
| 10 ... 30 | 11 ... 30 | 10 ... 26 | 1 ... 4 | 45 | 45 | - | |
| -1 ... 0 | -0.91 ... 0 | -1 ... -0.4 | 0.09 ... 0.4 | 7 | 7 | - | |
| -0.8 ...+5 | -0.3 ...+5 | -0.8 ...+3 | 0.5 ... 2 | 15 | 25 | - |
| Current consumption 4) | Voltage | Current |
|---|---|---|
| Resistive load AC-1 | AC 230V | 10 A |
| Inductive load AC-15 | AC 230V | 4 A |
| Process connection per | Thread size |
|---|---|
| ISO 228-1 | G⅜B |
| Logo | Description | Country |
|---|---|---|
| EU declaration of conformity | European Union |
Industry
Machinery
Hydraulic systems
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1 standard articles of family PSM
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Stock:
SKUConfigurationPriceStockAction
PSM-550-BG311A-1-GCF-ZUnit: B · Pressure type: BG · Measuring range: BG311+ 4 moreOn requestOn orderRequest →
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