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US Gauge’s 1558 4" (100mm) Center Back Mount Liquid Filled Pressure Gauge - PSI & KPA (1558-4-PSI-KPA) is constructed with a SST case, brass socket, and a phosphor bronze bourdon tube for applications that need the protection of liquid filling.
The 1558 liquid filled gauges have a crimped ring and dual scale psi/bar or kPa/psi dial as standard. The pressure gauge is key for environments with high vibration, pulsation, pressure spikes and condensation build up. Liquid filling guards the pressure gauge internally, and dampens the pointer to better readability. Liquid filling also stops condensation build up due to temperature fluctuations on the inside window. The case is material is 304 SST with a crimped on window and a liquid fill plug at the top of the case for simples field filling if needed. The gauge meets Grade B+ accuracy (±1.6%) and is NEMA 4X / IP66 compliant to increase the life of your pressure gauge. Pressure ranges are from Vacuum to 10 000 psi
| Sizes | 1-1/2", 2", 2-1/2", 4" |
| Ranges | Dual scale psi/bar (100 x kPa); psi/kPa |
| Accuracy | ±3-2-3% of span(Grade B); ±1.6% for 4" (Grade B+) |
| Bourdon Tube | Phosphor bronze |
| Window | Polycarbonate |
| Movement | Brass |
| Dial | Aluminum, white background with blue and black markings |
| Pointer | Aluminum, black finish |
| Case and Ring | 300 series stainless steel case and crimped ring |
| Connection | 1-1/2" – 1/8-27 CBM, NPT; 2", 2-1/2", 4" – 1/4-18 NPT LM, CBM and CBM with front flange; 4" – 1/2-14 LM, NPT |
| Seals | BUNA-N |
| Weather Protection | NEMA 4X/IP66 |
Connection Size & Pressure Ranges
| 171985A | 1/4" NPT 0 - 30" Hg VAC |
| 171986A | 1/4" NPT 30"-0-15 PSI |
| 171987A | 1/4" NPT 30"-0-30 PSI |
| 171988A | 1/4" NPT 30"-0-60 PSI |
| 171989A | 1/4" NPT 30"-0-100 PSI |
| 171990A | 1/4" NPT 0 - 15 PSI |
| 171991A | 1/4" NPT 0 - 30 PSI |
| 171992A | 1/4" NPT 0 - 60 PSI |
| 171993A | 1/4" NPT 0 - 100 PSI |
| 171994A | 1/4" NPT 0 - 160 PSI |
| 171995A | 1/4" NPT 0 - 200 PSI |
| 171996A | 1/4" NPT 0 - 300 PSI |
| 171997A | 1/4" NPT 0 - 600 PSI |
| 171998A | 1/4" NPT 0 - 1000 PSI |
| 171999A | 1/4" NPT 0 - 1500 PSI |
| 172000A | 1/4" NPT 0 - 2000 PSI |
| 172001A | 1/4" NPT 0 - 3000 PSI |
| 172002A | 1/4" NPT 0 - 6000 PSI |
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