Dwyer Photohelic A3000 Series Differential Pressure Switch-Gauge for Air or Gas
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4" dial differential pressure switch and gauge for air and non-combustible compatible gases, ±2% to ±4% full scale accuracy. 1/8" NPTF process connections, plastic case and lens, aluminum dial, two setpoint adjustment knobs on front face. Ranges 0" to 150" WC standard. Rated for pressures to 25 PSIG. Each switch setpoint has two Form C relays (DPDT). CE, CSA, UL approvals.
DwyerA3000 Photohelic combination switch/gauges are versatile, highly repeatable pressure switches combined with a precise pressure gauge. Photohelic measures and controls positive, negative or differential pressures of air and compatible gases. Standard models are rated to 25 PSIG.
- Typical applications include air conditioning systems, clean rooms, and fume exhaust systems
- Transformer power to the relay coil: 120 VAC input
- Two Form C DPDT relays for low/high limit control
- Setpoint knobs and zero adjustment screw on front face
- Setpoints can be interlocked to provide variable deadband for control of fans or dampers
- Continuous gage reading unaffected by switch operation, even during loss of electrical power
- Optical limit switches, used for reliability and long service life, attach directly to set pointers and align individually to ensure precise switching accuracy
- Standard models in "WC ranges; Also available in WC with air velocity/FPM, mm WC, pA and kPA
Model Selection Guide
Use this table to find the right model for your application. If the model, range, or engineering unit you need isn't listed here, call Lesman at 800-953-7626.
| Range | Accuracy (%FS) | Click for Price
and Availability |
Range |
Accuracy (%FS) | Click for Price
and Availability | |
|---|---|---|---|---|---|---|
| Dwyer A3000 Photohelic Indicating Switch/Gage, Lo-Limit, and Hi-Limit Control | ||||||
| 0-0.25" WC | ±4% | A3000-00 | 0-15" WC | ±2% | A3015 | |
| 0-0.50" WC | ±3% | A3000-0 | 0-20" WC | ±2% | A3020 | |
| 0-1" WC | ±2% | A3001 | 0-25" WC | ±2% | A3025 | |
| 0-2" WC | ±2% | A3002 | 0-30" WC | ±2% | A3030 | |
| 0-3" WC | ±2% | A3003 | 0-40" WC | ±2% | A3040 | |
| 0-4" WC | ±2% | A3004 | 0-50" WC | ±2% | A3050 | |
| 0-5" WC | ±2% | A3005 | 0-60" WC | ±2% | A3060 | |
| 0-6" WC | ±2% | A3006 | 0-80" WC | ±2% | A3080 | |
| 0-8" WC | ±2% | A3008 | 0-100" WC | ±2% | A3100 | |
| 0-10" WC | ±2% | A3010 | 0-150" WC | ±2% | A3150 | |
| Dial Size | 4 Inch |
|---|---|
| Process Connection | 1/8" NPTF Side |
| Case Material | Plastic |
| Liquid Filled | No |
| Accuracy | ±2% to ±4% FS (range-dependent) |
| Dial Material | Aluminum |
| Measuring Range | 0" to 150" WC |