Endress+Hauser pressure transmitters are industrial field instruments used for measuring process pressure, differential pressure and hydrostatic level in applications involving liquids, gases and steam. Depending on the application, they can be used to monitor process pressure continuously, calculate tank levels, detect filter pressure losses or provide differential pressure signals for flow measurement systems.
However, not all pressure transmitters operate according to the same measuring principle. Selecting the right instrument requires evaluating the measured parameter, process conditions, pressure range, process connection, wetted-part materials and communication requirements of the control system.
The main Endress+Hauser product families include:
Cerabar: Pressure transmitters for gauge and absolute pressure measurement.
Deltabar: Differential pressure transmitters, also used for hydrostatic level measurement in suitable configurations.
Deltapilot: Instruments designed for hydrostatic pressure and level measurement.
Waterpilot: Submersible hydrostatic level probes for water, wastewater and similar applications.
Ceraphant: Pressure switches for pressure monitoring and limit-value control.
These product families serve different functions. For example, measuring pressure through a connection at the top of a tank is not the same application as calculating liquid level from hydrostatic pressure at the bottom of the tank. Similarly, a differential pressure transmitter should be considered when the pressure difference between two process points needs to be measured.
| Product family | Primary function | Typical applications |
|---|---|---|
| Cerabar | Gauge and absolute pressure measurement | Pump discharge lines, process pipelines and pressurized tanks |
| Deltabar | Differential pressure measurement | Filter monitoring, pressure difference between two points, flow and level in suitable systems |
| Deltapilot | Hydrostatic pressure and level measurement | Tanks and liquid-level applications |
| Waterpilot | Submersible hydrostatic level measurement | Water wells, reservoirs, drinking water and wastewater systems |
| Ceraphant | Pressure switching and limit-value monitoring | Machinery, process pressure alarms and control |
This table summarizes the main functional differences between the product families. The suitability of a specific model must still be verified against its technical documentation and ordering configuration.
The Cerabar series includes pressure transmitters used in applications requiring process pressure measurement. Depending on the selected model and measuring cell, the instrument can measure gauge pressure or absolute pressure.
Selecting a Cerabar transmitter requires more than checking its measuring range. Process temperature, overpressure conditions, process connection, diaphragm material, fill fluid, ambient conditions and the required communication interface must also be considered.
Cerabar PMP21
The PMP21 is a pressure transmitter featuring a metallic measuring cell. Suitable variants are available for gauge and absolute pressure applications. Its compact design and process connection options make it suitable for consideration in machinery and process pressure measurement.
The measuring range, accuracy and available options must be verified for the specific ordering variant.
Manufacturer product page: Cerabar PMP21
Cerabar PMC21
The PMC21 is a pressure transmitter featuring a ceramic capacitive measuring cell. Its oil-free measuring cell design can be relevant for applications where this characteristic is required. Model selection should take into account the measuring range, process connection, measured medium and operating conditions.
Manufacturer product page: Cerabar PMC21
Cerabar PMP71B
The PMP71B is an intelligent pressure transmitter designed for process pressure measurement. According to the manufacturer's product information, accuracy options include up to 0.05% for the standard option and up to 0.025% for the Platinum option. The product page lists a measuring range of 400 mbar to 700 bar. These values do not mean that every ordering variant can cover the entire range.
The manufacturer's page lists 4–20 mA HART and PROFINET over Ethernet-APL. Other communication options may be available in specific configurations. Certifications, connections, temperature limits and the selected accuracy option must be verified against the ordering code.
Manufacturer product page: Cerabar PMP71B
Cerabar PMP43
The PMP43 is a Cerabar model designed for hygienic applications. In industries such as food and beverage and life sciences, hygienic design, cleanability, process connections and applicable approvals are important selection criteria. The scope of hygienic connections and certifications must be verified for the selected variant.
Manufacturer product page: Cerabar PMP43
Pressure monitoring at pump suction and discharge lines
Pressure control in process pipelines
Pressure measurement in tanks and equipment
High-temperature process applications with suitable connection and diaphragm configurations
Pressure measurement in hygienic processes
Special process conditions requiring suitable diaphragm seal options
For a detailed model comparison, see: Endress+Hauser Cerabar Series: Models, Product Families and Selection Guide.
The Deltabar series is used in applications where the pressure difference between two process points must be measured. Differential pressure is the difference between the pressure on the high-pressure side and the pressure on the low-pressure side:
Δp = p₁ − p₂
Differential pressure measurement can be used for filter blockage monitoring, process equipment monitoring and flow measurement with a suitable primary element. It can also be used for level measurement in appropriate tank and connection arrangements.
The PMD63B is listed by the manufacturer for differential pressure measurement and suitable hydrostatic level applications. The product page specifies standard accuracy of up to 0.075%. Process temperature, measuring range, connection options and communication interfaces must be checked against the technical documentation for the selected variant.
Manufacturer product page: Deltabar PMD63B
These models can be considered for differential pressure applications, but they should not be treated as interchangeable based solely on their model numbers. The measuring cell, process connections, diaphragm seal arrangement, measuring range and other configuration details must be checked individually.
When selecting a replacement for an existing instrument, both mechanical connection compatibility and measuring range, pressure limits, static pressure conditions and control system compatibility must be evaluated.
For more information, see: Endress+Hauser Deltabar Series: Differential Pressure Transmitters and Model Selection.
Hydrostatic level measurement uses the pressure generated by a column of liquid. The basic relationship is:
p = ρ × g × h
Where:
p: Hydrostatic pressure
ρ: Liquid density
g: Gravitational acceleration
h: Liquid height
Changes in density, tank geometry, reference pressure and installation conditions can affect the calculated level. Therefore, hydrostatic level measurement requires consideration of the liquid properties and tank arrangement, not just the transmitter's pressure range.
The FMB50 is one of the Deltapilot models used for hydrostatic level measurement. The manufacturer's product page lists a measuring range of 100 mbar to 10 bar, standard accuracy of 0.2% and optional accuracy of 0.1%. The suitability of these values must be assessed for the selected measuring cell and configuration.
Manufacturer product page: Deltapilot FMB50
The Deltapilot FMB50, FMB51, FMB52 and FMB53 models may differ in their installation and process connection options. A connection or installation feature available on one model should not automatically be assumed to be available on the others.
For more information, see: Endress+Hauser Deltapilot Series: Hydrostatic Pressure and Level Transmitters.
The Waterpilot series includes probes designed for hydrostatic level measurement by immersion in a liquid. Applications may include water wells, reservoirs, storage tanks, drinking water systems and wastewater installations.
The FMX21 is a hydrostatic level probe featuring an oil-free capacitive ceramic measuring cell. The manufacturer's product page lists a measuring range of 100 mbar to 20 bar, standard accuracy of 0.2% and optional accuracy of 0.1%. The maximum measuring distance is specified as 200 m H₂O.
Depending on the configuration, the instrument may offer HART-adjustable measuring ranges and an optional temperature sensor. Cable material, probe diameter, temperature limits and approvals must be verified for the selected variant.
Manufacturer product page: Waterpilot FMX21
For more information, see: Endress+Hauser Waterpilot FMX11 and FMX21 Hydrostatic Level Transmitters.
Pressure transmitters typically provide a continuous measured value, while pressure switches are used for switching and limit-value control based on defined thresholds. Depending on the application, analog or digital output options can be evaluated against the control architecture and process requirements.
The PTC31B is a pressure switch featuring a ceramic measuring cell. The manufacturer's product page lists a measuring range of 100 mbar to 40 bar and accuracy of 0.3%. IO-Link communication can be considered for applicable configurations.
When selecting a model, check the output type, electrical connection, pressure limits, process connection and temperature conditions together.
Manufacturer product page: Ceraphant PTC31B
When choosing between models such as PTC31B, PTP31B and PTP33B, compare their ordering codes and technical documentation. Their connection, measuring and output options should not be assumed to be identical.
Selecting the right transmitter starts with determining the reference against which pressure must be measured.
Gauge pressure is measured relative to atmospheric pressure. Pump discharge lines and many process pipelines monitored against atmospheric pressure can use this measurement principle.
Absolute pressure is measured relative to an ideal vacuum. An appropriate absolute pressure model may be required when changes in atmospheric pressure are relevant to the measurement.
Differential pressure represents the difference between two pressure points. Examples include filter inlet and outlet monitoring, suitable flow measurement systems and certain tank-level applications.
Selection rule: Do not select a model until it is clear whether the measurement must be referenced to atmosphere, to an absolute vacuum reference, or to the pressure difference between two process points.
With the correct measurement arrangement and calculation method, pressure transmitters can be used in flow and level applications. However, a transmitter does not necessarily measure flow or level directly on its own.
For differential pressure flow measurement, flow can be calculated from the pressure difference using a suitable primary element and appropriate process conditions. In hydrostatic level measurement, variables such as liquid density and reference pressure are important.
During selection, consider:
Density and properties of the measured fluid
Measuring range and expected operating range
Tank geometry or primary flow element type
Static pressure and overpressure conditions
Installation, impulse line and manifold requirements
Measurement signal and communication requirements of the control system
Endress+Hauser pressure instruments may offer different analog and digital communication options. However, not every protocol is available across every product family or model.
| Communication | Key selection considerations |
|---|---|
| 4–20 mA | Analog input compatibility, two-wire connection and power supply requirements |
| HART | Control system compatibility, configuration and diagnostics requirements |
| IO-Link | IO-Link master, port configuration and device compatibility |
| PROFIBUS PA | Existing field communication infrastructure and device compatibility |
| PROFINET over Ethernet-APL | Ethernet-APL infrastructure, connections and network requirements |
| Bluetooth | Availability on the specific model and variant |
For example, the manufacturer lists 4–20 mA HART and PROFINET over Ethernet-APL for the PMP71B. These options should not automatically be attributed to other Cerabar models.
For control system upgrades, the existing protocol, cabling, power supply, device description files and control system compatibility must be evaluated together.
Certification requirements for industrial pressure transmitters depend on the process and the plant's risk assessment. Certifications should not be assumed to apply to every model merely because they are associated with a brand or product family.
ATEX and IECEx: For instruments used in potentially explosive atmospheres, the applicable protection concept, gas or dust group, temperature class and site requirements must be checked.
SIL: For functional safety applications, suitability must be assessed using the relevant safety documentation and the design of the complete safety function. The existence of SIL-related documentation for a model does not automatically mean that every configuration and mode of use is suitable.
Hygienic approvals: In food and beverage and life sciences applications, the required process connections, materials and hygienic design conditions must be checked. Approvals such as 3-A or EHEDG must be verified for the applicable product and configuration.
Before ordering, verify the certificate number, ordering code, approval scope and installation requirements.
A diaphragm seal or special connection may be required when a standard process connection is unsuitable. High temperatures, corrosive fluids, viscous media, hygienic design requirements and installation constraints can create this need.
In differential pressure systems, the manifold and impulse line arrangement can also affect measurement performance. Installation height, line routing, fluid properties and static pressure conditions should be considered.
Before ordering, clarify the following:
Process connection type and nominal size
Measuring range and maximum process pressure
Process temperature and wetted materials
Diaphragm seal type and fill fluid requirements
Manifold and mounting accessories
Required certifications and connection standards
The following steps can help identify the appropriate model.
1. Define the measurement task. Determine whether the application requires gauge pressure, absolute pressure, differential pressure, hydrostatic level measurement or threshold switching.
2. Establish the measuring range. Consider the normal operating range, expected minimum and maximum values, static pressure and overpressure conditions.
3. Check the process conditions. Fluid type, temperature, corrosive properties, viscosity and hygienic requirements affect the choice of measuring cell and materials.
4. Verify mechanical compatibility. Check the process connection, mounting dimensions, cable or electrical connection and physical compatibility with existing equipment.
5. Define communication and electrical requirements. Confirm that the selected model supports the required analog signal, HART, IO-Link, PROFIBUS PA or Ethernet-APL interface.
6. Check certification and safety requirements. Verify the appropriate product variant and documentation for hazardous areas, hygienic processes and functional safety applications.
7. Verify the ordering code and technical documentation. Confirm that all required options, accessories and approvals are included in the selected configuration.
When replacing an existing instrument, do not determine equivalence solely from the product family name or measuring range. Compare the full ordering code and technical documentation of the existing instrument with the proposed replacement configuration.
In particular, verify:
Measuring principle and measuring range
Accuracy and required measurement performance
Process connection and diaphragm material
Electrical connection and supply voltage
Analog or digital communication compatibility
Certifications and safety requirements
Mounting dimensions, accessories and maintenance requirements
Current product availability and lifecycle status
A product's absence from the current catalogue does not automatically mean that a direct replacement is available. Current product status and suitable alternatives must be verified against manufacturer documentation.
Yeşil Grup Enerji supports industrial instrumentation requirements through an independent, brand-neutral sourcing approach. Depending on the request, this may include product research, ordering code verification, technical configuration checks and alternative product evaluation.
When requesting a quotation for Endress+Hauser pressure transmitters, providing the following information can help with accurate product evaluation:
Full model designation and ordering code, if available
Measuring range and measurement type
Process connection and material requirements
Communication protocol and electrical connection
Required certifications or approvals
Quantity, delivery location and target delivery date
Sharing the existing instrument's nameplate, ordering code or technical datasheet can improve the assessment of the required configuration and potential alternatives.
Independent supplier disclosure: Yeşil Grup Enerji is not an official distributor or authorized representative of Endress+Hauser. It provides independent, brand-neutral industrial sourcing support, including product research, ordering code and technical configuration checks, alternative model evaluation and quotation support.
For product enquiries and quotation requests:
Website: https://www.yesilgrupenerji.com
Email: [email protected]
Phone: +90 505 696 61 00
Cerabar is primarily used for gauge and absolute pressure measurement. Deltabar is designed to measure differential pressure between two process points. Suitable Deltabar configurations can also be used in level or flow calculations.
Waterpilot is characterized by its submersible hydrostatic level probes. The Deltapilot family includes products for hydrostatic pressure and level measurement with different mounting and connection options. Selection should be based on the measurement environment and mechanical requirements.
No. Communication options vary by model and ordering configuration. The supported protocols must be verified in the technical documentation for the specific instrument.
Some models and configurations may have the relevant hazardous-area approvals. However, certification scope is not identical across the entire product family. The ordering code and certificate documentation must be checked together.
A replacement must be selected by comparing the measuring principle, range, process connection, materials, electrical connection, communication interface and certifications. Direct equivalence should not be assumed from the model name alone.
The model designation or full ordering code, quantity, measuring range, process connection, communication protocol, certifications and delivery details are useful starting points. The existing instrument's nameplate or technical documentation can help identify the correct configuration.
No. Yeşil Grup Enerji is not an official distributor or authorized representative of Endress+Hauser. It provides independent sourcing support, product research, technical configuration checks and quotation assistance.
Selecting the right Endress+Hauser pressure transmitter requires consideration of the measuring principle, pressure range, process conditions, connection options, communication requirements and certifications—not just the product family name.
Cerabar is considered for process pressure measurement, Deltabar for differential pressure applications, Deltapilot and Waterpilot for hydrostatic level measurement, and Ceraphant for pressure switching applications. The final model selection must be verified against the ordering code and relevant technical documentation.
When requesting product research or a quotation from Yeşil Grup Enerji, sharing the existing model, ordering code and technical requirements helps facilitate the evaluation of suitable products and potential alternatives.