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Dwyer Instruments
Dwyer A3000 Photohelic Pressure Switch/Gage
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A3000: Photohelic DP gage+2 setpoints; ±2% FS; air/gas. RFQ range.
Download datasheet PDF
RFQ cart holds BOM lines only. Submit for engineering quote.
Key parameters
Measuring range
Full-scale ranges from 0–0.25 in w.c. up to 30 psi
Accuracy
±2% FS at 70 °F (21.1 °C); ±3% on -0 and ±4% on -00 models
Process connection
1/8 in female NPT
Approvals
CE; CSA; UL
Service
Air and non-combustible compatible gases
Pressure Limits
−20 in Hg to 25 psig standard; MP 35 psig; HP 80 psig
Fits combined differential pressure indication and dual set-point switching where you need a Dwyer A3000 Photohelic—air/gas DP ranges with about ±2% FS accuracy at 70 °F and two adjustable set-point switches plus an analog gage dial.
Key advantages
- Function — Combined gage and two set-point switches
- Ranges — in w.c., Pa, kPa bands; up to ~25 psig class
- Accuracy — ±2% FS at 70 °F (±3%/-0, ±4%/-00 models)
- Medium — Air and compatible gases
- Use — Panel DP monitoring with alarms
Typical applications
- Cleanroom / filter DP with alarms.
- Fan status with visual gage.
- Building pressurization panels.
Selection guide
- Range / units
- Set-point wiring
- Panel cutout
Common mistakes
- Liquid media.
- Expecting ±2% on -00 models (they are looser).
- Wrong voltage for switch circuit.
When to RFQ / what to tell us
- Range model.
- Quantity, ship-to.
Request a Quote · Get selection help
Specs
| Spec | Value |
|---|---|
| SKU | 37049 |
| Brand | Dwyer Instruments |
| Model | A3000 Photohelic |
| Product type | Differential Pressure Switch Gage |
| Type | Photohelic differential pressure switch/gage (Dwyer A3000) |
| Range | Differential ranges in in w.c., Pa, kPa; up to about 25 psig class |
| Medium | Air and compatible gases |
| Accuracy | ±2% FS at 70 °F (±3% on -0, ±4% on -00 models) |
| Output | Combined gage with two set-point switches |
Documents
FAQ
Q: Accuracy? A: ±2% FS at 70 °F on standard models.
Q: Set-points? A: Two adjustable set-point switches plus gage.
Q: What should I send for a quote? A: Range model, quantity, ship-to.
Links
| Parameter | Value |
|---|---|
| Measuring range | Full-scale ranges from 0–0.25 in w.c. up to 30 psi |
| Accuracy | ±2% FS at 70 °F (21.1 °C); ±3% on -0 and ±4% on -00 models |
| Process connection | 1/8 in female NPT |
| Approvals | CE; CSA; UL |
| Service | Air and non-combustible compatible gases |
| Pressure Limits | −20 in Hg to 25 psig standard; MP 35 psig; HP 80 psig |
| Temperature Limits | 20 to 120 °F (−6.67 to 48.9 °C); low-temperature option available |
| Size | 4 in dial face; 5 in OD × 8-1/4 in deep |
| Weight | 4 lb (1.81 kg) |
| Switch Type | Each setpoint has 2 Form C relays (DPDT) |
| Repeatability | ±1% of FS |
| Electrical Rating | 10 A @ 28 VDC; 10 A @ 120/240 VAC |
| Power Requirements | 120 VAC 50/60 Hz standard; 240 VAC and 24 VAC optional |
| Setpoint | Front-knob adjustable hi/lo; individual deadband <1% FS (one pointer width) |
| Special Features | 3-in-1 Magnehelic gage + phototransistor hi/lo switch; continuous gage reading independent of switch/power |