Differential pressure transmitters
Our differential pressure transmitters are characterised by high accuracy and long-term stability.
Differential pressure is a widely applicable measurand. It is used in numerous applications in the field of air conditioning and cleanroom technology, but also in ventilation process technology. Here you will find an overview of our differential pressure transmitters for stationary differential pressure measurement and their typical areas of application. All differential pressure transmitters of halstrup-walcher are designed for non-aggressive gaseous media. We offer pressure transmitters for industrial applications as well as for standard applications.
Advantages of halstrup-walcher pressure transmitters
- Particularly suitable for very small measurement ranges
- High long-term stability guaranteed, reliability over many years
- Absolute zero point stability and high overload resistance
- Ideal for positive and negative differential pressures
- For symmetrical or asymmetrical measurement ranges
- No overflow due to separation of the two connection sides
Differential pressure transmitters for industrial applications
Our differential pressure transmitters for high requirements work according to the inductive measuring principle. The core piece is a diaphragm made of beryllium bronze. Its deflection is measured without contact using inductive displacement transducers. It sits between two measuring chambers and can thus measure positive and negative differential pressure. The measuring cell does not wear out due to friction or mechanical influences. The material beryllium bronze is very springy. It has excellent long-term stability, good temperature behaviour and very low hysteresis. This makes our high-quality pressure transmitters suitable even for the smallest measurement ranges of a few pascals.
- High precision, fine minimum measurement ranges
- Margin of error: 0.2 % or 0.5 % of max. value (depending on selected option)
- Integrated cyclic zero correction keeps measured values stable even when the environment changes
- High overload protection due to built-in valve.
- Many adjustment and setting options: Measurement ranges freely scalable, square root output signal, relay settings (optional), time constant and zero point correction switch-off.
- In combination with primary elements, these pressure transmitters can also be used for volume flow measurement.
P 26
- Min. measurement range: ± 10 Pa
- Protection class: IP 65
Options
- Power supply: 24 VAC, 230/115 VAC
- Display: Menu in German, English, Italian, French
- 2 relays with floating changeover contacts
- Air-counter function
- Zero point correction via external interface
- USB interface and free parameterisation software
P 34
- Min. measurement range: ± 10 Pa
- Protection class: IP 20
Options
- Relay/switching output
- Analogue inputs for temperature for P/T compensation in the unit for volume and mass flow measurements
- Volume flow configurable via k-factor or 20 individual values
- Push-in fitting/angled grommet instead of hose nozzles
P 29
- Min. measurement range: ± 250 Pa
- Protection class: IP 65
Options
- Display: Menu in German, English, Italian, French
- Cutting ring coupling instead of laboratory nozzle
- USB interface and free parameterisation software
Differential pressure transmitters for standard applications
Our differential pressure transmitters for standard applications work with different measuring cells. Their functions and accuracies are matched to basic requirements. They are the economical alternative for numerous applications.
- Compact pressure transmitters with linear curve
- Minimum measurement range: ± 50 Pa
- Also ± and asymmetric measurement ranges
- Optional LC displays for all 3 pressure transmitters
PU/PI
- Protection class: IP 65
- Margin of error: 1 % of max. value
PS 27
- Protection class: IP 65
- Margin of error: 2 % or 3 % of max. value
Options
- Toggles between 4 measurement ranges, adjustable via DIP switch
- Output signal can be configured using DIP switches
- Power supply: optionally as 2-wire version
- Relay (changeover contacts)
- Push-in fitting instead of hose nozzle
PS 17
- Protection class: IP 67
- Margin of error: 2 % or 3 % of max. value
Options
- Toggles between 4 measurement ranges, adjustable via DIP switch
- Output signal can be configured using DIP switches
- Square root output signal in % of max. output value
- Power supply: optionally with 24 VDC or 2-wire version
- Relay (changeover contacts)
- Connection plug or M20 cable gland instead of 2 x M16 cable gland
Calibrations
To ensure the reliability of your pressure transmitters, we offer in-house calibrations and calibration certificates according to DKD guideline 6-1 or within the scope of ISO 9001. Learn more about our calibrations here.
Use of the differential pressure transmitters ...
... in cleanrooms
In cleanrooms, it must be ensured that no contaminated air flows in from corridors or areas with a lower cleanroom class. This is achieved by continuous overpressure control. At the heart of the control are precise differential pressure transmitters with small measurement ranges (a few pascals).
Continuous pressure monitoring and control is prescribed in ISO standard 14644 for all cleanrooms.
A spot check of the measurement devices must take place at regular intervals.
... in hospitals
In hospitals, it is vital to keep the air germ-free − for example in the operating theatre. Here, too, continuous overpressure ensures that no contaminated air from surrounding rooms penetrates.
The opposite measuring principle is used, for example, in isolation areas. Quarantines are used to contain epidemics. There must be a negative pressure in the room concerned compared to the surroundings so that no pathogens can escape.
... in filling machines and hygienic plants
Hygiene and sterility are key requirements in the pharmaceutical and food industries. This is ensured by suitable materials and elaborate cleaning processes. Product quality is jeopardised when the end product comes into contact with the ambient air. If the air is not treated, it transports germs and other contaminants (such as oil aerosols, particles, etc.) directly to the product.
Precise pressure measurement and control ensures that a safe overpressure is continuously maintained in the minienvironment.
Application of the differential pressure transmitters
Each customer has specific requirements in the industry and application where differential pressure transmitters are used. Discover the possible uses of our pressure transmitters in the various industries and applications:
Volume flow probes
Find here our accessories for measuring flow velocities in air ducts.
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