WIKA 232.50 Stainless Steel Bourdon Tube Pressure Gauge
Overview
The WIKA 232.50 is a stainless steel Bourdon tube pressure gauge for the process industry, built to EN 837-1 and ASME B40.100. It is the unfilled (dry) member of the WIKA 232.50/233.50 family described in WIKA data sheet PM 02.02, and is designed for gaseous and liquid aggressive media that are not highly viscous or crystallising, including installations in aggressive environments. Nominal sizes are 63, 100 and 160 mm, and scale ranges run from 0 to 0.6 bar up to 0 to 1,600 bar, with vacuum and compound ranges also available.
Seven Star LLC supplies the WIKA 232.50 to refineries, gas processing plants, power stations, desalination plants and contractors across Oman and the GCC, with engineering support in Muscat. For buyers searching for a pressure gauge supplier in Oman, it is one of the most widely specified process gauges, because a single model number covers chemical, oil and gas, power and water applications with consistent materials and documentation.
Measurement Principle
Pressure enters a Bourdon tube made of 316L stainless steel, in either C-type or helical form. As pressure rises, the oval cross-section of the tube tends to become round and the tube straightens slightly. The movement of the tube tip is transmitted through a stainless steel movement to the pointer, which sweeps across the dial in proportion to the applied pressure. No external power is needed, and the reading remains available during a power or control system failure.
Because the case of the WIKA 232.50 is not filled, the movement and pointer are undamped. This gives the widest temperature capability in the family: the medium can be from -40 to +200 °C and the ambient from -40 to +60 °C, compared with -20 to +100 °C for glycerine-filled instruments. Where strong pulsation or vibration is present, the data sheet points to the liquid-filled 233.50, and a restrictor of 0.6 or 0.3 mm can also be fitted in the process connection.
Engineering Design of the WIKA 232.50
The case is stainless steel 1.4301 (304) or 1.4571 (316Ti), with a stainless steel bayonet ring and a laminated safety glass window on NS 100 and 160 (polycarbonate on NS 63). The design meets safety level S1 to EN 837-1, with a blow-out device on the back of the case for NS 100 and 160, so that in the event of a failure, overpressure escapes away from the operator. Ranges up to 16 bar include a compensating valve to vent and reseal the case. All wetted parts, the Bourdon tube and the process connection, are 316L, and the measuring element is helium leak tested.
Process connections include G 1/2 B, G 1/4 B, M20 x 1.5 and other EN 837-1 threads, ISO 7 threads and 1/2 or 1/4 NPT, in lower mount, lower back mount or centre back mount. Mounting options cover panel flanges, surface flanges and a triangular profile ring with bracket. The WIKA 232.50 can be ordered with increased overload safety of two to five times, vacuum resistance to -1 bar, mark or drag pointers and special dials, and a QR code on the dial links to serial number, order number and certificates online.
Key Features
The WIKA 232.50 is specified wherever a robust, all stainless steel gauge with a long service life is required:
- Completely stainless steel construction, case and wetted parts, for corrosive media and environments.
- Excellent load cycle stability and shock resistance, as stated in the WIKA data sheet.
- Scale ranges from 0 to 0.6 bar to 0 to 1,600 bar, plus vacuum and compound ranges from -1 to +24 bar.
- Accuracy class 1.0 for NS 100 and 160, and class 1.6 for NS 63.
- Unfilled case allows medium temperatures up to +200 °C and ambient temperatures down to -40 °C.
- Safety level S1 case with blow-out device to EN 837-1.
- Options for oxygen service, NACE MR0175 / ISO 15156 sour service and ATEX Ex h approval.
- Ingress protection IP65, or IP66 for ranges of 0 to 20 bar and above.
Industrial Applications
In oil and gas production around the Oman interior, at the Sohar and Duqm refining and petrochemical complexes, and in gas processing plants, the WIKA 232.50 is used on separators, manifolds, injection skids, utility air and nitrogen headers. The dry version is often preferred on hot lines, instrument air and gas service, and wherever oil-free construction is required. Power and desalination plants along the coast use it on boiler feed, cooling water, RO high-pressure and chemical dosing lines, where the stainless steel case resists the salt-laden atmosphere.
In buildings and district cooling plants, the gauge reads chilled water supply and return pressures at pumps, strainers and heat exchangers, giving a local reading independent of the BMS. Seven Star LLC supplies the WIKA 232.50 in the size, range and connection the project requires, with the official data sheet, and can combine it with diaphragm seals or accessories when the medium is viscous, crystallising or very hot.
Technical Specifications
The values for the WIKA 232.50 are taken from WIKA data sheet PM 02.02 (03/2025):
| Parameter | Specification |
|---|---|
| Model | WIKA 232.50 Bourdon tube pressure gauge, stainless steel, unfilled |
| Standard | EN 837-1; ASME B40.100 |
| Nominal size | 63 mm (2.5 in), 100 mm (4 in), 160 mm (6 in) |
| Scale ranges | 0-0.6 to 0-1,600 bar; vacuum and compound -1 to +24 bar |
| Accuracy | Class 1.0 (NS 100, 160); class 1.6 (NS 63) |
| Measuring element | Bourdon tube, C-type or helical, 316L |
| Case | Stainless steel 304 or 316Ti, safety level S1, blow-out device |
| Window | Laminated safety glass (polycarbonate on NS 63) |
| Process connection | 316L; G 1/2 B, G 1/4 B, M20 x 1.5, R 1/2, 1/2 NPT and others |
| Medium temperature | -40 to +200 °C |
| Ambient temperature | -40 to +60 °C |
| Pressure limitation | NS 100/160: steady full scale, fluctuating 0.9 x full scale, short time 1.3 x full scale |
| Ingress protection | IP65; IP66 for ranges from 0-20 bar |
How to Order
To request a quotation for the WIKA 232.50, send Seven Star LLC the nominal size, scale range and unit, process connection and location, medium and temperature, and any options such as NACE construction or panel mounting. Our Muscat team will confirm the configuration, advise on stock and delivery for Oman and the GCC, and provide the official WIKA data sheet. Related WIKA products on our site include the liquid-filled WIKA 233.50 Bourdon tube pressure gauge, the WIKA 990.27 diaphragm seal and the WIKA CPG1500 precision digital pressure gauge for field checks.
- Datasheet WIKA Data Sheet PM 02.02, Models 232.50 and 233.50 Download
WIKA pressure and temperature models listed
WIKA identifies mechanical instruments by model number:- Bourdon tube pressure gauges: 111.10 and 212.20 for general duty, 213.53 liquid-filled, 232.50 in stainless steel
- Differential pressure: 732.51 gauge and DPGT43 with output signal
- Electronic pressure: UPT-20 process transmitter and CPG1500 precision digital gauge
- Bimetal thermometers: TG54, A52 and model 55
- Electrical temperature: TR12-B and TR33 resistance thermometers and the TC10-B thermocouple for thermowell mounting
Where WIKA instruments are used
WIKA pressure gauges and thermometers give local indication on pumps, vessels, headers and skids in refineries, gas plants, power stations, water treatment and machine building throughout the GCC. Stainless steel gauges such as the 232.50 are specified for corrosive atmospheres and process media, and liquid filling is chosen where vibration or pulsation is present. Transmitters and resistance thermometers feed the control system.Ordering WIKA instruments: what we need
For WIKA pressure gauges send the model, nominal size (for example 63, 100 or 160 mm), scale range and unit, process connection thread and its position (lower or back mount), wetted material and any filling, and accessories such as a diaphragm seal or contacts. For thermometers and probes add stem or insertion length, stem diameter, sensor type and class, and thermowell details. A photo of the dial and of the label on the case usually answers most of these points.Browse WIKA products by category: Pressure Instrumentation, Temperature Instrumentation.
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