PROJECTEnquire ↗Process measurement assemblies
A reliable reading depends on the complete assembly: process tapping or thermowell, transmitter and a correctly configured control-system input.
Operating context
Engineering combines operating conditions, material compatibility and maintenance access. A sensor may require a valve manifold, diaphragm seal or thermowell. These accessories influence mechanical integrity, response and measurement uncertainty, so they belong in the same specification.
Engineering priorities
Gauge, absolute and differential pressure are different quantities. Differential measurement also requires consideration of static pressure and both connection paths. The connecting assembly must suit the required function and the process medium.
An RTD or thermocouple needs an appropriate range, construction and immersion length. A thermowell requires assessment of flow and mechanical loading, beyond simply matching the connection and material grade.
Multipoint measurement can reveal temperature distribution. The specification defines point locations, supports, sensor routes and junction-box or transmitter interfaces. The number of points follows from process requirements and the vessel construction.
We use our own gun-drilling equipment to produce deep bores in thermowells. Engineering documents define the material, process connection, insertion length, bore diameter and depth, and sensor fit. Fabrication and dimensional inspection follow the approved drawing and the requirements of the specific measuring assembly.
Our hydraulic pressure calibrator and temperature calibrator support inspection and calibration of the corresponding instruments and sensors. The range, connections and calibration points are defined for the instrument. Transmitter settings and outputs can also be checked as specified, relating results to the actual measuring-assembly configuration.
Before engineering
Agreed with the proposal
The actual scope and acceptance criteria depend on the application and contract.
Selection in context
Define the pressure reference and measuring range first; a diaphragm seal is a process connection arrangement, not an additional pressure reference.
On a small screen, scroll the table sideways to compare the selection criteria.
| Principle or option | Typical application | What to verify when selecting |
|---|---|---|
| Gauge pressure | Process pressure relative to ambient atmosphere, for example at a pump or utility header. | Whether the required value is gauge or absolute; also overload, pressure surges, range and reference venting conditions.[1] |
| Absolute pressure | Pressure referenced to vacuum for vacuum processes or calculations requiring absolute pressure. | Required vacuum and positive-pressure range, uncertainty at the operating point and sensor compatibility with the fluid.[1] |
| Differential pressure | Filter pressure loss, flow across a primary element, or level in a closed tank. | Differential range and static pressure, one-sided overload, tap positions and connecting-line arrangement.[1][2] |
| Diaphragm seal, with capillary where required | Separation of a gauge or transmitter from the fluid under demanding material, hygienic or temperature conditions. | Diaphragm and fill fluid, process and ambient temperature, capillary length and elevation, and assembly effects on response and error.[3] |
Reviewed on 18 October 2026. Selection is confirmed for the specific operating conditions and equipment design.
Selection in context
Beyond range and accuracy, consider measurement location, process dynamics and thermal contact, because surface temperature may differ from the fluid temperature inside equipment.
On a small screen, scroll the table sideways to compare the selection criteria.
| Principle or option | Typical application | What to verify when selecting |
|---|---|---|
| Resistance temperature detector, RTD | Contact process temperature measurement where stability and repeatability matter. | Sensor type and wiring arrangement, lead resistance, immersion, thermowell and complete assembly response.[1][2] |
| Thermocouple | Contact measurement in demanding thermal processes; suitability depends on thermocouple type and protective construction. | Metal pair, environment, polarity, extension or compensating cable, and cold-junction compensation.[1][2] |
| Bimetal thermometer | Local dial indication for operators without an electrical power supply. | Range, active stem length and immersion, mounting orientation, readability and installation vibration.[3] |
| Infrared measurement | Non-contact surface temperature measurement of moving, hot or difficult-to-access objects. | Emissivity and reflections, target size, distance, optical path and a spectral range appropriate to the material.[4] |
Reviewed on 18 October 2026. Selection is confirmed for the specific operating conditions and equipment design.
Connected disciplines
Related technologies
Before we start
It protects the instrument in particular applications, but the complete assembly needs assessment. Fill fluid, capillary and ambient temperature can affect both response and measurement error.
It is one input. Materials, temperature cycles, immersion length, mechanical loading and required response time also determine whether the assembly is suitable.
Your next project
Send your drawings, operating parameters or a short description of the change you need. We will review the technical interfaces and propose the next steps towards a quotation, clarifying any missing information with you.
Discuss your requirements ↗Prepare a technical brief →+420 731 771 147info@emkoproject.cz