Manogauge vacuum pressure gauge - axial model ZX-02-A. Range −760 mmHg–0. Accuracy ±1.6 / 2.5%. Steel. Connection G/PT/NPT 1/4". 2 configurations available. ISO 9001 / CE / KS certified.
| Pressure Range | −760 mmHg–0 |
| Dial Size | Ø40–100mm |
| Material | Steel |
| Accuracy | ±1.6 / 2.5% |
| Connection | G/PT/NPT 1/4" |
| Filling | Dry |
| Configurations | 2 variants |
| Vacuum range | −760 mmHg to 0 (−101.3 kPa / −14.7 psi / −1 bar) |
| Media temp. range | −20 °C to +60 °C |
| Ambient temp. range | −20 °C to +60 °C |
| Overload | Bourdon tube rated for positive-pressure surge to 0.3 bar |
| Dual scale option | mmHg + kPa, inHg + kPa, or bar (negative) + mmHg |
ZX-02 vs vacuum gauges across market tiers
| Feature | Manogauge ZX-02 | European Tier-1 | American Tier-1 | Generic (unbranded) |
|---|---|---|---|---|
| Price range (USD) | $5–14 | $20–45 | $22–50 | $2–6 |
| Accuracy class | Class 1.6 / Class 2.5 | Class 1.6 | Class 1.6 | Class 2.5 |
| Standard | EN 837-1 | EN 837-1 | ASME B40.100 | Varies by supplier |
| Wetted material | P-bronze / 316L SS opt. | P-bronze or 316L SS | Brass or 316L SS | P-bronze typical |
| Dual scale options | mmHg+kPa, inHg+kPa, bar+mmHg | mmHg+kPa standard | inHg+kPa standard | mmHg only |
| Lead time | 5–10 business days | 2–5 weeks | 3–6 weeks | 3–7 days |
| Minimum order | No MOQ | No MOQ | No MOQ | 50–100 units typical |
| Custom dial | Yes — no tooling fee | Available, setup fee | Available, setup fee | Limited options |
A vacuum gauge (ZX-02) reads only negative pressure, from 0 to −760 mmHg (full vacuum). A compound gauge reads both vacuum (negative) and positive pressure on a single dial — useful when the same line can swing between both. ZX-02 gives finer vacuum resolution when positive pressure excursions never occur.
The bourdon tube is rated for brief positive-pressure surges up to 0.3 bar. Sustained positive pressure will over-range and permanently damage the tube. Install a pressure-relief valve upstream if positive overpressure is possible.
Bourdon tube: phosphor bronze (standard) or 316L SS (optional). Socket/connector: brass (standard) or 316L SS (optional). Specify SS wetted parts for moist or mildly corrosive vapours.
Standard: mmHg. Dual scale: mmHg + kPa, inHg + kPa, or bar (negative) + mmHg. Custom: mbar, Torr. Specify at order.
At full atmospheric vacuum, the pointer should read −760 mmHg (0 Torr, 0 mbar absolute). Note that gauge accuracy is ±2.5% FS = ±19 mmHg at the vacuum extreme — use a calibrated reference if absolute vacuum depth is critical.
Only with the optional 316L SS bourdon tube and socket. Standard phosphor-bronze tube is not rated for steam or aggressive vapours. Ensure there is no condensate trap that could cause a water hammer hit on the bourdon tube.
50 mm, 63 mm, 100 mm, and 160 mm. 100 mm is recommended for vacuum service — the expanded scale improves readability near full vacuum.
Yes, but note that refrigerant-compatible wetted parts (brass) are standard. For R-410A or CO₂ (transcritical), the gauge serves only the evacuation/dehydration phase; install a dedicated refrigerant gauge (ZX-10) for operating pressure monitoring.
Class 2.5 (±2.5% FS = ±19 mmHg) standard. Class 1.6 (±12 mmHg) available for tighter process control. Both are calibrated against a reference standard before shipment.
Yes — this is covered by a separate compound range model. Contact us specifying the positive pressure range required (e.g. −1 to +5 bar), and we will quote the appropriate compound gauge.