Image is for reference only, refer to product info for complete details.
Bezel and front cover (with set point knobs and zero adjustment screw) removed to expose Photohelic® switch/gage set point mechanism. Cover is clear polycarbonate plastic. Gage pointer and light shutter are mounted on helix and balancing counterweight.
Bezel and front cover (with set point knobs and zero adjustment screw) removed to expose Photohelic® switch/gage set point mechanism. Cover is clear polycarbonate plastic. Gage pointer and light shutter are mounted on helix and balancing counterweight.
Photohelic® Switch/Gauges function as versatile, highly repeatable pressure switches combined with a precise pressure gauge employing the time-proven Magnehelic® gauge design. The Photohelic® switch/gage measures and controls positive, negative or differential pressures of air and compatible gases.
| Switch Specifications | |
| Switch Type | Each set point has 2 Form C relays (DPDT) |
| Repeatability | ±1% of FS |
| Electrical Rating | 10 A at 28 VDC 10 A at 120 240 VAC |
| Electrical Connections | Screw terminals. Use 167°F (75°C) copper conductors only |
| Power Requirements | 120 VAC, 50/60 Hz 240 VAC and 24 VAC power optional |
| Mounting Orientation | Diaphragm in vertical position. Consult factory for other position orientations |
| Set Point Adjustment | Adjustable knobs on face |
| Agency Approvals | CE, CSA, UL |
| Gauge Specifications | |
| Service | Air and non-combustible, compatible gases |
| Accuracy | ±2% of FS at 70°F (21.1°C) ±3% on -0 ±4% on -00 models |
| Pressure Limits | -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) |
| Temperature Limits | 20 to 120°F. (-6.67 to 48.9°C) -20 to 120°F (-28 to 48.9°C) with low temperature option |
| Process Connections | ⅛ female NPT |
| Dimensions | 4" (101.6 mm) dial face 5 x 8¼" (127 x 209.55 mm) |
| Weight | 4 lb (1.81 kg) |
| Switch Specifications | |
| Switch Type | Each set point has 2 Form C relays (DPDT) |
| Repeatability | ±1% of FS |
| Electrical Rating | 10 A at 28 VDC 10 A at 120 240 VAC |
| Electrical Connections | Screw terminals. Use 167°F (75°C) copper conductors only |
| Power Requirements | 120 VAC, 50/60 Hz 240 VAC and 24 VAC power optional |
| Mounting Orientation | Diaphragm in vertical position. Consult factory for other position orientations |
| Set Point Adjustment | Adjustable knobs on face |
| Agency Approvals | CE, CSA, UL |
| Gauge Specifications | |
| Service | Air and non-combustible, compatible gases |
| Accuracy | ±2% of FS at 70°F (21.1°C) ±3% on -0 ±4% on -00 models |
| Pressure Limits | -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) |
| Temperature Limits | 20 to 120°F. (-6.67 to 48.9°C) -20 to 120°F (-28 to 48.9°C) with low temperature option |
| Process Connections | ⅛ female NPT |
| Dimensions | 4" (101.6 mm) dial face 5 x 8¼" (127 x 209.55 mm) |
| Weight | 4 lb (1.81 kg) |
