Dwyer A3000 Series Photohelic® Differential Pressure Switch/Gauge
Photohelic differential pressure switch/gauge with pointer indication and 2 sets of DPDT photoelectric relays, high and low limits settable.
- Original Factory Genuine, Tenfold Compensation for Counterfeits
- Full Machine Warranty, Lifetime Maintenance
- In Stock, Shipped on the Same Day
The A3000 Series Photohelic differential pressure switch/gauge provides continuous pointer indication with 2 sets of phototransistor-driven DPDT relays for high and low limit control. The gauge reading is unaffected by switch operation and remains readable on power loss. Standard pressure rating 25 psig; ranges from 0-0.25″ w.c. to 30 psi.
| Parameter Name | Technical Specifications |
|---|---|
| Main specifications | |
| Medium | Air and non-combustible, compatible gases |
| Material | Please consult the manufacturer |
| Accuracy | ±2% of full scale at 70°F (21.1°C). ±3% for -0 models, ±4% for -00 models |
| Pressure limit | -20" Hg. to 25 psig (-0.677 to 1.72 bar) MP option; 35 psig (2.41 bar) HP option; 80 psig (5.52 bar) 36003S-36010S; 150 psig (10.34 bar) 36020S and higher; 1.2 range |
| Temperature Range | 20 to 120°F (-6.67 to 48.9°C); low temperature option available |
| Connections | 1/8" NPT female |
| Size | 4" (101.6 mm) dial, 5" (127 mm) OD x 8-1/4" (209.55 mm) |
| Weight | 4 lb (1.81 kg) |
| Switch type | Two Form C relays (DPDT) per set point |
| Repeatability | ±1% of full scale |
| Electrical Specifications | 10A @ 28 VDC, 10A @ 120, 240 VAC |
| Electrical Connection | Screw terminals |
| Power Supply | 120VAC, 50/60 Hz; optional 240VAC & 24 VAC |
| Installation positioning | Diaphragm in vertical orientation. Consult factory for other mounting positions |
| Set Point Adjustment | Via externally adjustable knob mechanism |
| Certification | UL, CSA, CE |
| Model selection | |
| Selection table | Published on the official website as a screenshot of the model selection table; for complete model numbers and ranges, see the official manual "A3000.i.pdf" in the documentation package. |
- Continuous pointer indication; reading unaffected by switch actuation; readable even when power is off
- 2 sets of DPDT relays, adjustable high/low limits, deadband less than 1% of full scale
- Set points can be interlocked to form a variable deadband, suitable for fan/damper control
- Standard pressure rating 25 psig, optional 35 or 80 psig
- Ranges cover 0-0.25" w.c. to 30 psi
Cleanroom positive pressure interlock control
When differential pressure falls below the lower limit, the relay is triggered to increase supply air volume or raise an alarm.
Fan and damper linkage
Start/stop the fan or adjust damper opening according to the set differential pressure to maintain room differential pressure.
Need selection advice or bulk quotation?
Send us the working condition parameters (signal type, medium, range, pressure, temperature, connection method), and our engineers will provide a selection scheme and quotation within 1 working day.
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