WIKA Flush Diaphragm Pressure Transmitter For Viscous & Particle-Laden Media Model S-11

The WIKA S-11 is designed for: viscous media (oils, polymer melts, syrups, glycerine, molasses), paste-like and semi-solid media (tomato paste, chocolate, putty, caulk), adhesive and sticky substances (hot-melt adhesives, resins, gums), crystallising media (sugar solutions, salt solutions, chemical crystallisates), particle-laden media (slurries, pulp, sand suspensions, ceramic slips), and contaminated or fouling media that would block a conventional pressure port.

Gauge pressure: 0–0.1 bar to 0–600 bar (G½B flush), 0–0.1 to 0–1.6 bar (G1B flush), 0–0.1 to 0–25 bar (G1B Hygienic). In psi: 0–15 psi to 0–6,000 psi. Absolute pressure: 0–0.25 to 0–16 bar abs (0–15 to 0–250 psi abs). Vacuum and compound: –0.6/0 to –1/+24 bar; –30 inHg/0 to –30 inHg/+300 psi. All ranges also available in mbar, MPa, and further units. The instrument is vacuum-tight as standard.

Yes — the WIKA S-11 is specifically listed for food and beverage applications. The G1B Hygienic flush connection is 3-A Sanitary Standard certified (USA), with 316L stainless steel wetted parts and surface roughness Ra ≤0.76 µm for cleanability. A food-compatible system fill fluid per FDA 21 CFR 178.3750 is available as an option. Welding sockets with leak-control channels per 3-A Sanitary Standards are available as accessories. It is suitable for dairy, beverage bottling, brewing, food packaging, and sauce/paste production.

Standard accuracy is ≤±0.5% of span — including non-linearity, hysteresis, zero offset, and end value deviation per IEC 61298-2. An improved option of ≤±0.25% of span is available for measuring ranges ≥0.25 bar. Non-linearity (BFSL) per IEC 61298-2 is ≤±0.2% of span. Non-repeatability is ≤0.1% of span. Long-term stability is ≤±0.2% of span per year at reference conditions. Temperature coefficients for zero and span are ≤±0.2% of span per 10K within the rated range 0–80°C.

Three flush connections: G½B flush — for industrial applications, high-pressure ranges to 600 bar; larger bore for better flow-through cleanability; cooling element option for up to 150°C. G1B flush — larger diaphragm diameter for very low pressure ranges (0–0.1 to 0–1.6 bar); ideal for extremely viscous pastes at low pressure. G1B Hygienic — 3-A Sanitary Standard certified; 316L wetted parts with Ra ≤0.76 µm; for food, dairy, pharma; up to 25 bar; FDA fill fluid option. Choose G½B for high-pressure industrial; G1B for low-pressure viscous; G1B Hygienic for sanitary applications.

Without cooling element (standard): medium temperature –30 to +100°C. Extended option without cooling: –30 to +125°C. With integrated cooling element: medium –20 to +150°C (302°F) — ambient temperature –20 to +80°C applies in all cases. The cooling element is required for process temperatures exceeding +100°C (or +125°C for extended version). Note: with cooling element, vibration resistance reduces from 20g to 10g and shock resistance from 1000g to 400g.

IP65 (DIN angular connector DIN 175301-803 A) — suitable for dusty and splash environments. IP67 (M12×1 circular connector 4-pin, or cable outlet IP67) — suitable for occasional water immersion and washdown. IP68 (cable outlet IP68) — rated for continuous submersion; note: zero point and span potentiometer adjustment is not available in IP68 version. The stated IP code only applies when used with mating connectors of the corresponding IP rating.

Available seals: NBR (standard for G½B and G1B, –30 to +100°C, up to 600 bar); FKM/FPM (for higher temperature or media incompatible with NBR, minimum –20°C); EPDM (for hygienic applications and CIP/SIP cleanability, up to 200 bar); FFKM (G½B O-ring only, for extremely aggressive media, up to 600 bar, all temperatures). For food and pharma: EPDM is standard. For aggressive chemicals: specify FFKM (G½B). Standard seals are included in delivery; replacements available as accessories.

4–20mA current (2-wire, DC 10–30V supply) — most common, suited for long cable runs and standard PLC input cards; 0–20mA current (3-wire, DC 10–30V) — allows broken-wire detection; DC 0–10V voltage (3-wire, DC 14–30V) — direct SCADA or analogue input interface; DC 0–5V voltage (3-wire, DC 10–30V) — low-voltage embedded systems. Settling time ≤2ms. Other output signals available on request. Zero and span adjustment ±5% via internal potentiometers (except IP68 version).

The S-11 has a flush diaphragm for viscous, paste, crystallising, and particle-laden media — its defining feature is the flush process connection that prevents clogging. The S-20 has a conventional recessed pressure port suitable for clean, low-viscosity gaseous and liquid media, but offers far wider configurability (up to 1600 bar, three accuracy classes, 15+ connection types, 1B+ versions). Choose S-11 when your media cannot enter a conventional pressure port or when 3-A Sanitary / FDA compliance is needed. Choose S-20 for demanding clean process applications requiring precision, high pressure, or special media (oxygen, hydrogen).

Yes. The S-11 is specifically listed for level measurement applications by WIKA. The flush diaphragm is ideal for hydrostatic level measurement in tanks containing viscous, pasty, or slurry media. Mounting the S-11 at the tank bottom or side allows the media pressure to act directly on the diaphragm, providing a proportional 4–20mA output corresponding to level height. The vacuum-tight design covers both vented and pressurised tanks. Compound and vacuum measuring ranges extend the application to tanks under vacuum or low pressure.

CE (EMC Directive EN 61326 Group 1 Class B, Pressure Equipment Directive PED, RoHS) for Europe; CSA (Canada, electrical and overpressure safety); EAC (Eurasian Economic Community electromagnetic compatibility); GOST (Russia, metrology); KazInMetr + MTSCHS (Kazakhstan, metrology and commissioning); BelGIM (Belarus, metrology); Uzstandard (Uzbekistan, metrology); 3-A Sanitary Standard (USA — hygienic G1B version only, third-party verified); MTTF >100 years per manufacturer's data.

Welding sockets: G½B flush (order 1192299), G1B flush (1192264), G1B hygienic flush (14145179), G1B hygienic with leak-control channel 3-A Sanitary (14145183). Mating connectors: DIN 175301-803 A (with/without cable, metric or conduit gland), M12×1 straight or angled with shielded cable (2m, 5m, 10m). Replacement seals: O-ring and profile sealing for G½B and G1B in NBR, FPM/FKM, EPDM, FFKM. Blue (WIKA) or brown (neutral) mating connector seals also available.

Yes. The S-11 has internal potentiometers for zero point (±5% of span) and span (±5% of span) field adjustment. This allows compensation for process-specific offsets without returning the instrument to the factory. Adjustment is available for all electrical connection types (DIN angular, M12 circular, cable IP67) except the IP68 cable outlet version — the IP68 enclosure is sealed against water ingress and potentiometer access is not provided.

Without cooling element: vibration resistance 20g per IEC 60068-2-6 (under resonance); shock resistance 1000g per IEC 60068-2-27 (mechanical). With cooling element: vibration 10g; shock 400g. The standard (no cooling element) S-11 is exceptionally shock-resistant at 1000g — making it robust for filling machinery, production line vibration, and pulsating pump systems found in food processing and chemical dosing environments.

G½B flush and G1B flush: wetted parts in 316Ti stainless steel. G1B Hygienic flush: 316L stainless steel with surface roughness Ra ≤0.76 µm (meets 3-A Sanitary Standard cleanability requirements). Internal pressure transmission medium: synthetic oil (standard) or FDA 21 CFR 178.3750 food-compatible fill fluid (option for food and pharma). Sealing materials are available in NBR, FKM/FPM, EPDM, and FFKM — selected per media, temperature, and pressure requirements.

The S-11 meets EMC Directive EN 61326 for emission (Group 1, Class B) and interference immunity (industrial application). WIKA notes that strong electromagnetic fields in frequency ranges below 2.7 GHz can result in increased measuring errors of up to 1%. To avoid this, do not install S-11 in the vicinity of strong electromagnetic interference sources such as radio transmitters or high-power equipment. If unavoidable, use sheath current filters on the signal cable.

The flush diaphragm of the S-11 integrates directly into the process pipe or vessel wall with zero dead space. During CIP cleaning cycles, the cleaning agent contacts the entire internal pipe surface uniformly — including the diaphragm — without residue pockets or shadow zones. This is particularly important in food and pharmaceutical production where media changes must leave no cross-contamination. The 3-A Sanitary version (G1B Hygienic) with Ra ≤0.76 µm surface finish and EPDM seals ensures full CIP and SIP compatibility.

Yes. Zebco Engineering LLP is an authorized WIKA distributor in India, supplying the WIKA S-11 flush transmitter pan India to food processing clusters (Pune, Ludhiana, Ahmedabad), pharma zones (Hyderabad, Bengaluru, Baddi), and all major industrial cities. International orders to the Middle East (UAE, Saudi Arabia, Qatar), Southeast Asia, and South Asia are handled with proper export documentation, CE and 3-A certificates. Contact: +91 98982 26321 / sales@zebcoeng.com.