WIKA UPT-20 UPT-21 Universal Process Transmitter

$120.00

The WIKA UPT-20 / UPT-21 Process Transmitter provides reliable pressure measurement with a large, easy-to-read digital display and integrated temperature compensation. The UPT-20 uses a standard pressure port, while the UPT-21 features a flush diaphragm for applications requiring a different process connection.

With configurable process connections, a rotatable display and hazardous-area approval options, the series is suitable for industrial process control, food production, pharmaceutical manufacturing and chemical processing.

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The WIKA UPT-20 / UPT-21 is a digital process pressure transmitter that converts measured pressure into an electrical signal for industrial monitoring and control. Both models feature integrated temperature compensation and a configurable digital display.

  • UPT-20: Standard pressure port, with options for diaphragm seals and aseptic process connections.
  • UPT-21: Flush diaphragm design for applications requiring a flush-mounted sensing surface, including suitable hygienic processes.

Key Features

  • High measurement accuracy: Selectable accuracy specifications of 0.1%, 0.15%, 0.2% or 0.5% of span, depending on configuration.
  • 4–20 mA output: HART 7 communication available for compatible versions.
  • Temperature compensation: Compensated from 10°C to 70°C for measuring ranges up to 1,000 bar.
  • Large digital display: Rotatable LC display with pressure readings, warning messages and a bar graph.
  • Flexible housing: Conductive plastic or stainless steel, with electropolished options for hygienic environments.
  • Hazardous-area options: Approvals available for selected configurations.

Suitable Applications

  • Chemical and petrochemical plants: Process pressure monitoring in pipelines, vessels and industrial equipment.
  • Food and beverage production: UPT-21 with a suitable hygienic process connection for compatible production environments.
  • Pharmaceutical manufacturing: Configurations with suitable hygienic connections and surface finishes.
  • Machine and plant engineering: Pressure measurement for equipment control and process automation.
  • High-pressure systems: Selected UPT-20 configurations support measuring ranges up to 4,000 bar.

Technical Highlights & Selection Considerations

When choosing a UPT-20 or UPT-21, confirm the following:

  • Pressure type and range: Gauge, absolute or vacuum measurement; ranges depend on the model and connection.
  • Process connection: Threaded connection, flush diaphragm, diaphragm seal or hygienic connection.
  • Output and communication: Confirm 4–20 mA and whether HART 7 is required.
  • Wetted materials: Standard stainless steel options include 316L; alternative materials are available for selected configurations.
  • Display and enclosure: Choose the required display, housing material and environmental protection.
  • Certifications: Confirm the exact hazardous-area or safety approvals required for the installation.

The UPT-20 and UPT-21 are not interchangeable in every application. The process connection, measuring range and pressure limits must match the actual operating conditions.

FAQ

Q1: What is the main difference between UPT-20 and UPT-21?

The UPT-20 uses a standard pressure port and supports selected diaphragm-seal or aseptic assemblies. The UPT-21 uses a flush diaphragm process connection.

Q2: What output signal does the UPT-2x provide?

The listed output is 4–20 mA, with HART 7 available on compatible versions.

Q3: Is the UPT-21 suitable for food and pharmaceutical applications?

It can be configured with suitable hygienic process connections and surface finishes. Verify the specific connection and required approvals.

Q4: What measuring ranges are available?

Ranges depend on the model and configuration. Certain UPT-20 versions reach 4,000 bar, while UPT-21 ranges extend up to 600 bar.

Q5: What details are needed for a quotation?

Provide the full model or part number, pressure range and type, process connection, output requirements, housing material and any required certifications.

Model Versions & Enclosure Construction

Instrument Models Model UPT-20: Threaded process connection with internal pressure port, diaphragm seal assembly, or aseptic sterile process connections
Model UPT-21: Process connection with flush diaphragm
On-Site Display & Operation Unit Optional digital display Model DI-PT-U with large high-contrast segment display, integrated bargraph, and 4-button intuitive setup menu (readable from up to 5 m away)
Enclosure Materials (Non-Ex) Conductive PBT plastic (EN 60079-0:2012, night blue RAL5022);
Precision-cast stainless steel 1.4308 (CF-8) for chemical/petrochemical duties;
Electropolished stainless steel 1.4308 for sanitary/pharmaceutical/food industries;
Epoxy resin coated stainless steel options
Enclosure Materials (Hazardous Ex) Precision-cast stainless steel with epoxy resin coating or electropolished stainless steel with epoxy resin coating

Measurement Accuracy & Performance Limits

Accuracy (IEC 61298-2) Standard: 0.15% of span (options: 0.1% or 0.2% of span);
0.5% of span for measuring ranges > 1,000 bar (15,000 psi)
(Accuracy encompasses non-linearity, hysteresis, non-repeatability, zero offset, end value deviation, temperature effects, and long-term stability)
Turndown & Rangeability Recommended turndown up to 20:1 (≤ 1,000 bar); up to 2:1 (> 1,000 bar)
No accuracy degradation at turndown ≤ 5:1 for ranges 1.6 to 1,000 bar
Non-Repeatability ≤ 0.1% of span (≤ 1,000 bar); ≤ 0.5% of span (> 1,000 bar)
Zero Point & Span Adjustment Zero point: -20 to +95%; Span: -120 to +120% (≤ 1,000 bar); Mounting correction: -20 to +20%
Long-Term Stability Ranges ≥ 1.6 bar: 0.1% / year
Ranges 1.0 to 1.6 bar: 0.15% / year
Ranges < 1 bar: 0.35% / year
Thermal Stability No additional temperature error within compensated range 10 to 70 °C (50 to 158 °F) for ranges up to 1,000 bar;
Outside compensated range: typically < 0.1% / 10 K

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