Manogauge isolating-diaphragm gauge - radial type 1 model ZX-04-R1. Range 0–60 MPa. Accuracy ±1.6%. SS / Brass. Connection Flange / Thread. 2 configurations available. ISO 9001 / CE / KS certified.
| Pressure Range | 0–60 MPa |
| Dial Size | Ø40–100mm |
| Material | SS / Brass |
| Accuracy | ±1.6% |
| Connection | Flange / Thread |
| Filling | Dry |
| Configurations | 2 variants |
| System fill fluid | Silicone oil (standard); glycerine, halocarbon oil (for O₂), or PFPE (for aggressive media) |
| Diaphragm material | 316L SS standard; Hastelloy C-276, tantalum, PTFE-lined (specify at order) |
| Process connection | Threaded (G, NPT, BSPT) or flanged (DIN, ASME) — wide range available |
| Over-range protection | Hardstop inside diaphragm housing limits deflection to prevent rupture at 2× FS |
| Transmitter-compatible | Glycerine- or silicone-filled variant can be used as diaphragm seal on electronic transmitters |
ZX-04 vs diaphragm-seal gauge assemblies across market tiers
| Feature | Manogauge ZX-04 | European Tier-1 | American Tier-1 | Generic (unbranded) |
|---|---|---|---|---|
| Price range (USD) | $35–120 | $100–300 | $120–350 | $15–45 |
| Accuracy class | Class 1.6 (system) | Class 1.6 (system) | Class 1.0 (system) | Class 2.5 typical |
| Diaphragm materials | 316L / HC-276 / Ta / PTFE | Wide range | Wide range | 316L typical |
| Fill fluid options | Silicone / glycerine / PFPE / halocarbon | Full range | Full range | Silicone or glycerine |
| Max pressure | 0–60 MPa | 0–100 MPa | 0–100 MPa | 0–25 MPa typical |
| Lead time | 7–30 business days (config. dep.) | 6–12 weeks | 6–14 weeks | 7–14 days |
| Minimum order | No MOQ | No MOQ | No MOQ | 10–20 units typical |
| Transmitter compatible | Yes | Yes | Yes | Varies by supplier |
| Sanitary / 3-A | Yes — optional | Yes — wide range | Yes — wide range | Varies by supplier |
A diaphragm seal assembly separates the process medium from the pressure gauge's Bourdon tube by interposing a thin, flexible metal diaphragm. Process pressure deflects the diaphragm, which transmits pressure through a fill fluid (silicone oil, glycerine) to the Bourdon tube. The gauge wetted parts never contact the process medium — allowing corrosive, viscous, crystallising, or contaminated media to be measured safely.
316L SS (most chemical media), Hastelloy C-276 (mixed acids, chlorinated media, wet HCl), tantalum (concentrated mineral acids including HF and HCl at all concentrations), PTFE-lined (HF, strong oxidisers). Select based on chemical resistance data — contact engineering for mixed-acid or uncommon solvent service.
Silicone oil (standard): compatible with most media, −40 °C to +200 °C. Glycerine: food-grade alternative, −20 °C to +120 °C. Halocarbon oil: oxygen and chlorine service (non-flammable). PFPE (e.g. Galden): aggressive fluorochemicals, concentrated oxidisers. Specify fill fluid at order — changing fill fluid in the field requires complete disassembly and re-filling.
The diaphragm seal assembly is rated to 60 MPa (600 bar) with an appropriate Bourdon tube gauge. High-pressure versions use thick-wall diaphragm construction with a hardstop at 2× FS to prevent diaphragm rupture. Confirm with engineering for pressures above 40 MPa.
Yes, with silicone oil fill (rated to +200 °C). For saturated steam above 150 °C, glycerine fill is not suitable — use silicone oil. The diaphragm seal eliminates the need for a siphon pot, which is one of its main advantages on steam lines.
A small accuracy reduction occurs due to the capsule stiffness and fill-fluid compressibility adding to the gauge's total error. Typical system accuracy (seal + gauge) is Class 1.6. For high-accuracy requirements, specify a Class 1.0 gauge to achieve a combined system Class 1.6.
Yes. The glycerine- or silicone-filled diaphragm seal can be coupled to an electronic pressure transmitter instead of a Bourdon-tube gauge. This is common in process control applications where both a local indication (gauge) and a 4–20 mA output (transmitter) are required at the same process connection.
For sanitary service: the diaphragm contact surface is electropolished to Ra ≤ 0.8 µm. CIP-compatible elastomers (EPDM for NaOH/HNO₃ cleaning, Viton for SIP steam to 135 °C) are specified at order. The fill fluid does not contact the process — only the diaphragm surface requires sanitary compliance.
Threaded: G1/2, G1, G1½, G2, NPT 1/2", NPT 1". Flanged: DIN 2501 (PN10–PN400), ASME B16.5 (150#–2500#). Hygienic: DIN 11851, DIN 11864 (aseptic), SMS, RJT, BS 4825. Sanitary tri-clamp (ISO 2852). Specify connection standard, size, and pressure rating at order.
Standard assemblies (316L diaphragm, silicone fill, threaded connection): 7–14 business days. Hastelloy or tantalum diaphragm: 15–25 business days. Flanged assemblies with ASME or DIN certification: 20–30 business days. Rush production available on request.