The 11124512 is the Baumer PBMH-24B74RA fully welded piezoresistive hygienic pressure transmitter — a flush-diaphragm process pressure sensor with EHEDG certification, 3-A sanitary standard approval, and FDA-compliant wetted materials, providing 4–20 mA analog output over a 0–10 bar measuring range with ±0.1% FSR accuracy for hygienic pressure and level measurement in food, beverage, dairy, brewery, and pharmaceutical processing applications.
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What Is the 11124512?
The Baumer 11124512 (PBMH-24B74RA) is a fully welded hygienic pressure transmitter from Baumer’s PBMH series — designed specifically for pressure measurement in direct product contact applications where conventional pressure sensors with cavities, threads, or gaskets present unacceptable bacterial contamination risk.
The fully welded construction eliminates all internal joints and seals in the wetted zone, leaving only the flush-mounted metallic diaphragm in contact with the process medium. This construction principle satisfies the strictest hygienic design requirements of EHEDG (European Hygienic Engineering and Design Group) and the 3-A Sanitary Standards, enabling the 11124512 to be installed in direct product contact pipework and vessels without hygienic risk in food-grade and pharmaceutical production environments.
The measuring principle is piezoresistive — a silicon sensing element behind the flush metallic diaphragm converts diaphragm deflection under process pressure into a resistance change, which the transmitter’s electronics convert to a calibrated 4–20 mA output signal proportional to the 0–10 bar measuring range.
The transmitter’s excellent active temperature compensation maintains measurement accuracy across the full operating temperature range, compensating for the thermal sensitivity of the piezoresistive element that causes uncompensated sensors to drift significantly with product temperature changes. The zero point and measuring span can be externally programmed using Baumer’s FlexProgrammer tool without opening the transmitter housing, enabling field recalibration and range adjustment without removing the sensor from the process.
Key Technical Specifications
- Order Number: 11124512
- Model: PBMH-24B74RA
- Measuring Principle: Piezoresistive
- Measuring Range: 0–10 bar (relative)
- Output Signal: 4–20 mA (2-wire)
- Accuracy: ±0.1% FSR (including zero-point error, span error, nonlinearity, hysteresis, non-repeatability per EN 61298-2)
- Process Connection: G 1/2″ hygienic
- Diaphragm Material: Stainless steel 1.4435 (316L), fully welded
- Surface Roughness (wetted): Ra ≤ 0.8 μm
- Supply Voltage: 10–30 VDC
- Electrical Connection: M12-A connector, 4-pin
- Protection Rating: IP67 (with M12 connector mated)
- CIP Resistance: Compatible with all common CIP cleaning media
- SIP Capability: Up to 150°C, max. 30 minutes
- Process Temperature: -40°C to +125°C (standard); up to 200°C (high-temperature version)
- Ambient Temperature: -40°C to +85°C
- Certifications: EHEDG, 3-A Sanitary Standards, FDA-compliant wetted materials
- Optional: ATEX / IECEx / UKEX (Ex version available)
Typical Industrial Applications
The 11124512 is specified for direct product contact pressure and level measurement in hygienic processing industries where contamination risk elimination and cleaning validation are regulatory requirements. In dairy processing — pasteurisation lines, UHT treatment systems, cream separation, and cheese vat pressure monitoring — the 11124512’s flush diaphragm prevents milk protein deposits that accumulate in conventional threaded sensor cavities and generate bacterial growth between cleaning cycles.
Brewery process pressure measurement at fermentation vessel outlets, bright beer tanks, and carbonation systems uses the 11124512 for its CIP resistance and 3-A certification, which satisfies brewery audit requirements for hygienic instrumentation in product contact zones. Pharmaceutical API manufacturing and bioprocessing facilities require FDA-compliant wetted materials and EHEDG hygienic design for all process contact instrumentation — the 11124512’s 316L stainless steel diaphragm, Ra ≤ 0.8 μm surface finish, and full weld construction satisfy both FDA 21 CFR and EU GMP Annex 1 hygienic design requirements for pressure transmitters in classified manufacturing areas. Beverage production lines — carbonated soft drinks, juices, and bottled water — install the 11124512 for in-line pressure monitoring at filling heads, deaerators, and carbonators where the transmitter’s SIP capability (150°C, 30 minutes) ensures sterility validation of the measurement point without sensor removal.
In personal care and cosmetics production, where product viscosity and contamination sensitivity require hygienic instrumentation equivalent to food-grade standards, the 11124512’s EHEDG certification and flush diaphragm design satisfy the hygienic design requirements of GFSI-benchmarked quality management systems.
Installation Advice
The 11124512’s G 1/2″ hygienic process connection requires a compatible hygienic adapter or weld-in fitting — do not use standard G 1/2″ BSP pipe fittings, which do not provide the dead-space-free hygienic connection geometry required for EHEDG compliance. Baumer and third-party suppliers offer a range of weld-in sockets and hygienic adapters for the G 1/2″ PBMH connection in Tri-Clamp, DIN 11851, SMS, and RJT hygienic pipeline standards — specify the correct adapter for the pipeline standard used in the installation.
The 11124512 must be installed with the diaphragm flush with or slightly protruding into the process stream — installation in a pocket or tee fitting where the diaphragm is recessed from the flow creates a dead zone that retains product between cleaning cycles, defeating the hygienic design principle. For CIP cleaning validation, verify that the CIP cleaning fluid reaches the 11124512 diaphragm at the specified minimum flow velocity (typically 1.5 m/s in the adjacent pipeline) — low CIP flow velocity at the measurement point results in incomplete cleaning of the diaphragm surface, which may be detected during microbiological swab testing of the process contact surface.
Connect the 11124512’s M12-A connector with a Baumer or compatible IP67-rated M12 cable assembly — the IP67 protection rating of the transmitter applies only when the M12 connector is fully mated and locked. For installations subject to steam sterilisation (SIP), verify that the SIP cycle temperature does not exceed 150°C and the cycle duration does not exceed 30 minutes — exceeding these limits may permanently affect the transmitter’s calibration accuracy and should be confirmed against the specific SIP cycle parameters used in the installation.
Frequently Asked Questions
Q: Can the 11124512 be used for level measurement by hydrostatic pressure in an open tank, or only for in-line pressure measurement?
A: Yes. The 11124512 is well suited for hydrostatic level measurement in open and pressurised vessels — the transmitter measures the hydrostatic pressure of the liquid column above the diaphragm, which is proportional to liquid level when the product density is known and constant. Install the 11124512 at the base of the vessel with the diaphragm flush with the inner vessel wall and the 4–20 mA output scaled to the vessel’s level range using the FlexProgrammer or the connected PLC’s analog input scaling. For dairy, brewery, and pharmaceutical tank level applications, the 11124512’s EHEDG certification makes it directly suitable for product contact level measurement without additional hygienic fittings.
Q: What is the difference between the 11124512 (standard PBMH) and the PBMH ATEX variant for potentially explosive atmosphere installations?
A: The standard 11124512 is not ATEX certified and must not be installed in Zone 0, 1, or 2 explosive atmospheres. The PBMH ATEX variant (model code including the ATEX suffix, certified to SEV 11 ATEX 0129) provides equivalent hygienic and measurement performance with ATEX, IECEx, and UKEX certification for installation in classified explosive atmospheres — specify the ATEX variant for solvent-based product applications, distillery installations, or any process area classified as explosive atmosphere Zone 0, 1, or 2 per the ATEX directive.
Q: How is the 11124512’s zero point and span adjusted if the process requires a sub-range within the 0–10 bar full scale?
A: The 11124512 supports external zero and span adjustment using Baumer’s FlexProgrammer handheld tool, which connects to the transmitter’s M12 connector without opening the housing. The FlexProgrammer allows the 4 mA point (zero) and 20 mA point (span) to be set to any values within the 0–10 bar full scale, enabling the transmitter to provide full 4–20 mA output over a narrower process range — for example, 0–3 bar — for improved resolution on low-pressure applications. The maximum turndown ratio and minimum measuring span are specified in the PBMH datasheet and must be observed to maintain the ±0.1% FSR accuracy specification.
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