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Ashcroft
Ashcroft F-Series Explosion-Proof Pressure Switch
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F-Series: vac–4000 psi; ±1% span; NEMA 7/9 IP66; hermetic SPDT. RFQ range.
Download datasheet PDF
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Key parameters
Measuring range
Vacuum to 4000 psi depending on actuator; Buna-N ranges 30 IMV to 1000 psi; high-pressure piston to 4000 psi
Accuracy
Setpoint repeatability ±1% of span (additional ±1% of range per 50 °F from 70 °F setpoint)
Output
1 SPDT or 2 SPDT acting as DPDT hermetically sealed snap-acting micro switches
Process connection
1/4 NPT Female or 1/2 NPT Female, 316 stainless steel
Electrical connection
1/2 NPT Male with 18 in wire leads
Wetted parts
Buna-N, Teflon, Viton, 316L SS diaphragm/actuator; stainless steel piston with Viton O-ring options
Fits hazardous-area pressure alarm and shutdown where you need an Ashcroft F-Series switch—vacuum through about 4,000 psi, ±1% of span repeatability, hermetically sealed SPDT/DPDT elements, and a NEMA 3/4/7/9 IP66 enclosure.
Key advantages
- Ranges — Vacuum through ~4,000 psi
- Repeatability — ±1% of span typical
- Switch — SPDT or dual SPDT as DPDT; hermetically sealed options
- Setpoint — Adjustable 15–100% of range; fixed deadband
- Enclosure — NEMA 3, 4, 7, 9, IP66 anodized aluminum
Typical applications
- Offshore / petrochemical alarms.
- Pipeline shutdown interlocks.
- Compressor and turbine pressure trips.
Selection guide
- Range / wetted materials
- SPDT vs DPDT
- 1/4 vs 1/2 NPT process
Common mistakes
- Ignoring Class/Div documentation.
- Wrong diaphragm for media.
- Setpoint outside 15–100% adjustable band.
When to RFQ / what to tell us
- Range, materials, switch element.
- Quantity, ship-to.
Request a Quote · Get selection help
Specs
| Spec | Value |
|---|---|
| SKU | 37051 |
| Brand | Ashcroft |
| Model | F Series |
| Product type | Pressure Switch |
| Type | Explosion-proof pressure switch (Ashcroft F-Series) |
| Ranges | Vacuum through about 4,000 psi |
| Repeatability | ±1% of span (typical; plus temperature shift allowance) |
| Switch | 1 SPDT or 2 SPDT acting as DPDT; hermetically sealed options |
| Setpoint | Adjustable 15–100% of range; fixed deadband |
| Enclosure | NEMA 3, 4, 7, 9, IP66; anodized aluminum |
| Process connection | 1/4 or 1/2 NPT Female |
| Ambient | −20 °F to 150 °F (−28…65 °C) |
Documents
FAQ
Q: Enclosure? A: NEMA 3, 4, 7, 9 and IP66.
Q: Repeatability? A: ±1% of span typical.
Q: What should I send for a quote? A: Range/materials/element, quantity, ship-to.
Links
| Parameter | Value |
|---|---|
| Measuring range | Vacuum to 4000 psi depending on actuator; Buna-N ranges 30 IMV to 1000 psi; high-pressure piston to 4000 psi |
| Accuracy | Setpoint repeatability ±1% of span (additional ±1% of range per 50 °F from 70 °F setpoint) |
| Output | 1 SPDT or 2 SPDT acting as DPDT hermetically sealed snap-acting micro switches |
| Process connection | 1/4 NPT Female or 1/2 NPT Female, 316 stainless steel |
| Electrical connection | 1/2 NPT Male with 18 in wire leads |
| Wetted parts | Buna-N, Teflon, Viton, 316L SS diaphragm/actuator; stainless steel piston with Viton O-ring options |
| Protection | NEMA 3, 4, 7, 9, IP66 explosion-proof |
| Ambient temperature | −20 °F to 150 °F (−28 °C to 65 °C) |
| Approvals | UL; CSA; Class I Div 1/2 Groups A,B,C,D; Class II Div 1 Groups E,F,G |
| Setpoint | Single setpoint, factory set or field adjustable; adjustable 15–100% of range |
| Enclosure Material | Anodized aluminum |
| Deadband | Fixed; varies by switch element and range (see OEM range/performance tables) |
| Special Features | Dual-chamber explosion-proof enclosure; hermetically sealed micro switches; compact NEMA 7 profile |