WIKA Pressure Transmitter For Demanding Industrial Applications Model S-20

The WIKA S-20 offers: 2-wire current outputs 4–20mA and 20–4mA; 3-wire voltage outputs 0–10V, 0–5V, 1–5V, 0.5–4.5V, 1–6V, and 10–0V DC; and 3-wire ratiometric output 0.5–4.5V. Auxiliary power varies from DC 8–36V depending on the selected output. The 4–20mA output is the most common for long cable runs in industrial plants. The 0.5–4.5V ratiometric is used for embedded and microcontroller-based systems.

Gauge pressure: 0–0.4 bar to 0–1600 bar (0–5.8 psi to 0–23,200 psi). Absolute pressure: 0–0.4 bar abs to 0–40 bar abs. Vacuum and compound: –0.4/0 bar to –1/+59 bar. Available in bar, psi, kg/cm², kPa, and MPa. Special ranges from 0–0.4 to 0–1600 bar available on request (with reduced long-term stability and higher temperature errors).

Three classes: Standard (≤±0.5% BFSL, max error ≤±1%) for general process control; Improved (≤±0.25% BFSL, max error ≤±0.5%) for precision applications like pharma and food; Highest (≤±0.125% BFSL, max error ≤±0.25%) for calibration-grade measurement — available for 4–20mA and 0–10V outputs only. Long-term stability is ≤±0.1% of span for all classes. Non-repeatability is ≤0.1% of span.

The S-20 can be factory-calibrated at the temperature closest to actual operating conditions: standard 15–25°C, or optionally +4°C (refrigeration/cold rooms), +40°C (typical ambient industrial), +60°C (warm outdoor/process), or +80°C (hot environments). This reduces the temperature error to a minimum at the actual installation temperature — a feature unique to the S-20 among compact industrial transmitters.

IP65 with angular connector DIN 175301-803 A or C (standard industrial). IP67 with M12×1 circular connector (plastic or metal) or cable outlet IP67 (suitable for outdoor and wet environments). IP68 with cable outlet IP68 or IP68 FEP (submersion-rated). IP6K9K with field case or cable outlet IP6K9K (high-pressure water jet wash-down — suitable for food processing and outdoor heavy-duty wash-down applications). Metal M12 connector also provides enhanced vibration resistance (40g).

Standard connections include: G¼A, G½A (ISO 1179-2); M14×1.5 (ISO 9974-2); G⅛B through G½B (EN 837); M12×1.5, M20×1.5 (DIN 16288); ⅛NPT, ¼NPT, ½NPT (ANSI/ASME B1.20.1); 7/16-20 UNF and 9/16-18 UNF O-ring Boss (SAE J514); R¼, R⅜, R½ (ISO 7); PT¼, PT⅜, PT½ (KS). Pressure ports available in 0.3mm, 0.5mm, 0.6mm, 6mm, and 12mm diameters. Seals include NBR, FPM/FKM, EPDM, copper, stainless steel. Other connections available on request.

The WIKA A-10 is the general-purpose standard transmitter — one accuracy class, basic output options, standard IP65. The S-20 is the premium model for demanding applications: three accuracy classes (including ≤±0.125% BFSL), selectable adjustment temperatures, higher vibration resistance (20–40g vs lower for A-10), special media versions (oxygen, hydrogen, food), higher IP ratings (IP68/IP6K9K), integrated cooling element for medium temperatures up to +200°C, and service life of 100 million load cycles. For critical applications, research, or harsh environments, the S-20 is the correct choice.

Yes. Special versions are available. Oxygen service: oil- and grease-free construction, residual hydrocarbon <500 mg/m² (<30 bar) or <200 mg/m² (>30 bar), max range 400 bar, medium temperature –20 to +60°C, protective cap on process connection. Hydrogen service (≥25 bar): 316L and Elgiloy (2.4711) wetted parts, oil- and grease-free, residual hydrocarbon <1000 mg/m². Contact Zebco Engineering for these special versions — they require specific ordering codes.

Up to 100 million load cycles for measuring ranges below 600 bar; 10 million load cycles for ranges ≥600 bar. Long-term stability ≤±0.1% of span per IEC 61298-2. MTTF (Mean Time To Failure) exceeds 100 years per WIKA's manufacturer reliability data. The S-20 is regularly audited to maintain highest quality standards. These figures make it the transmitter of choice for critical, continuous-operation processes where reliability and service interval length matter.

Yes. Standard version supports medium temperature up to +100°C. The extended version supports –40 to +125°C. With an integrated cooling element (max 400 bar), medium temperatures up to +200°C are supported while the ambient temperature stays within –40 to +125°C — governed by a derating curve. For ambient temperatures <80°C, maximum medium temperature is +200°C. Above 80°C ambient, the formula Tmed = –1.61 × Tamb + 326°C applies.

Wetted materials depend on measuring range: ≤10 bar: 316L stainless steel; >10 bar: 316L + PH grade steel; >1000 bar: ASTM 630 + PH grade steel; absolute ranges: 316L; hydrogen version ≥25 bar: 316L + Elgiloy (2.4711). Sealing materials: NBR (–30 to +100°C), FPM/FKM (–40 to +200°C), EPDM (–40 to +125°C), copper (–40 to +200°C), stainless steel (–40 to +200°C). Case: 316Ti stainless steel.

Selectable signal damping: 10ms, 50ms, 100ms, 500ms, 1000ms, 2500ms, 5000ms. Settling time per IEC 61298-2: 3ms at 3dB/500Hz (standard) or 1ms at 3dB/1000Hz (alternative, with modified load specification). Switch-on time: 150ms (60 seconds with optional zero point adjustment 0.1%). Ratiometric and voltage outputs have a settling time of 2ms standard / 1ms alternative.

CE mark (EMC Directive, Pressure Equipment Directive PED, RoHS Directive) for the EU; cULus listing for USA and Canada; EAC for the Eurasian Economic Community; KazInMetr (Kazakhstan metrology) and MTSCHS (Kazakhstan commissioning); UkrSEPRO (Ukraine metrology); Uzstandard (Uzbekistan metrology); CRN (Canada pressure equipment). MTTF >100 years per manufacturer's data. Optional: China RoHS and instrument labelling per customer specification.

Available certificates: (1) EN 10204 2.2 test report covering manufacturing quality, material, and indication accuracy; (2) EN 10204 3.1 inspection certificate for wetted metal parts, accuracy, and calibration; (3) Factory calibration certificate; (4) DAkkS calibration certificate — traceable and accredited per ISO/IEC 17025 (German accreditation body). Recommended calibration interval: 1 year (conditions-dependent). Zebco Engineering can supply all certificate types — specify at time of ordering.

Yes. A food-compatible version is available with food-grade transmission fluid, oil- and grease-free construction, and residual hydrocarbon content below 1000 mg/m². A protective cap on the process connection ensures hygiene during packaging and installation. For hygienic process connections (e.g. tri-clamp, SMS, DIN 11851), a remote diaphragm seal can be paired with the S-20.

Per WIKA ordering information (PE 81.61), please provide: model (S-20), measuring range, overpressure limit, output signal, non-linearity (accuracy class), adjustment temperature, zero point setting, process connection type and size, pressure port diameter, seal material, electrical connection type, cable assembly type, cable length, shielding, required certificates, packaging, and instrument labelling. Zebco Engineering's technical team can assist in selecting the correct configuration for your application.

For measuring ranges below 10 bar: 3× or 5× full scale value (selectable). For ranges ≥10 bar: 2× full scale (standard) or 3× (only for gauge pressure ≤400 bar and absolute pressure <16 bar). The instrument is vacuum-resistant as standard. Note: a higher overpressure limit will result in a higher temperature error, and restrictions may apply based on process connection and seal selection. Maximum overpressure per connection varies — e.g., G½B EN 837 supports up to 2288 bar overpressure limit for the 1600 bar measuring range.

Yes. Zebco Engineering LLP is an authorized WIKA distributor in India, supplying the WIKA S-20 pan India to all major industrial locations including Mumbai, Ahmedabad, Surat, Vadodara, Delhi NCR, Pune, Chennai, Bengaluru, Hyderabad, Kolkata, Jamnagar, Visakhapatnam, and more. We also export internationally to the Middle East (UAE, Saudi Arabia, Qatar, Kuwait, Bahrain, Oman), Southeast Asia (Singapore, Malaysia), and South Asia (Bangladesh, Sri Lanka, Nepal). Contact us at +91 98982 26321 or sales@zebcoeng.com.

Key parameters: (1) Pressure type and range (gauge/absolute/compound + value); (2) Output signal (4–20mA for standard PLC, 0–10V for local display, ratiometric for embedded); (3) Accuracy class (0.5% standard, 0.25% precision, 0.125% for R&D/calibration); (4) Adjustment temperature matching your installation; (5) Process connection thread and size; (6) Seal and media compatibility; (7) IP rating based on environment; (8) Required certificates. Contact Zebco Engineering — our application engineers will recommend the optimal configuration and provide a quick quotation.