In industries where air quality, contamination control, process stability, and energy efficiency are critical, accurate differential pressure measurement plays a vital role. Whether maintaining positive pressure in a pharmaceutical cleanroom, monitoring airflow in a ventilation system, controlling containment areas, or ensuring filter integrity in food production, even very small pressure deviations can have serious consequences for safety, product quality, regulatory compliance, and operational efficiency.
Differential pressure transmitters are often installed in environments where pressure changes of only a few Pascals are critically important. In cleanrooms and hospital isolation rooms, precise pressure control prevents contaminants from entering controlled areas and helps protect personnel and products. In HVAC and ventilation systems, accurate airflow measurement supports indoor air quality and energy optimisation, while in pharmaceutical and food manufacturing it helps maintain stable, compliant production conditions.
Over time, however, sensors can drift due to ageing, temperature fluctuations, contamination, vibration, or continuous operation. Even minor inaccuracies can affect system performance, increase energy consumption, or compromise containment and process integrity. Regular calibration and verification are therefore essential to maintaining reliable long-term measurement performance.
Routine calibration not only confirms transmitter accuracy and long-term stability but also helps identify developing faults before they become critical, reducing downtime and improving system reliability. Accurate calibration also supports compliance with regulatory and quality assurance requirements while improving energy efficiency through more effective airflow and ventilation control.
Portable calibration and reference devices such as the KAL and EMA Series from halstrup-walcher provide a fast, highly accurate solution for performing these checks directly in the field. By enabling engineers and maintenance personnel to verify differential pressure transmitter performance quickly and reliably on-site, they help maintain confidence in critical systems where accuracy, safety, process quality, and energy management are all closely connected.
Halstrup Walcher KAL Series
The KAL series portable pressure calibration devices from halstrup-walcher, including the KAL84, KAL100, and KAL200, are designed for highly accurate calibration and verification of differential pressure transmitters and airflow measurement systems. Combining integrated pressure generation with high-precision low differential pressure measurement in a single portable instrument, the KAL series provides an efficient solution for both field calibration and stationary testing applications.
Designed as portable precision reference standards, these devices offer measuring ranges down to 0…100 Pa and measurement accuracies of up to ±0.1% of full scale, depending on the model and selected range. Their excellent long-term stability, repeatability, and automatic zero point adjustment make them highly effective in critical applications such as pharmaceutical cleanrooms, containment systems, semiconductor manufacturing, and high-performance HVAC installations, where precise pressure control is essential for process integrity, contamination prevention, and energy efficiency.
The rugged and lightweight KAL84 features integrated manual pressure generation using a pressure bellows and hand pump, while the KAL100 and KAL200 incorporate automatic pressure generation via an internal precision pump for faster, more repeatable calibration procedures. Across the range, features such as switchable pressure units, adjustable damping time constants for stable readings under fluctuating conditions, multilingual backlit displays, and integrated power supply and measurement connections for the device under test help simplify commissioning, servicing, and routine maintenance.
The KAL200 further extends calibration functionality with USB connectivity for PC integration and calibration curve generation and is supplied with a factory calibration certificate for traceable verification work. Together, the KAL series devices provide engineers and maintenance personnel with a fast, reliable, and highly accurate solution for on-site calibration of differential pressure instrumentation without removing installed transmitters from service.
EMA Series Portable Digital Pressure Gauges
The EMA84 and EMA200 digital manometers from halstrup-walcher are portable, battery-powered instruments designed for accurate measurement of positive and negative differential pressure in both field and laboratory environments. Their combination of high accuracy, long-term stability, low drift, and minimal temperature dependence makes them ideal for customer service and maintenance work on heating, ventilation and air-conditioning systems, flue pressure measurement, and filter monitoring.
The robust EMA84 is optimised for mobile use, offering measuring ranges from 0…100 Pa up to 0…100 kPa, easy manual zeroing, switchable units, and selectable damping time constants for stable readings during fluctuating pressure conditions. Optional higher accuracy versions and analogue output capability further extend its suitability for service and diagnostic work.
The EMA200 is a more advanced differential pressure and flow measurement instrument designed for demanding commissioning and analysis tasks. With measuring ranges from ±200 Pa to ±200 kPa, scalable analogue output, integrated temperature measurement, min/max memory, adjustable pitot factor and density settings, and push-button zero-point correction, it provides a highly versatile solution for accurate airflow and pressure measurement in industrial ventilation and HVAC systems. Together, the EMA series offers engineers and maintenance personnel a reliable and convenient portable solution for verifying differential pressure system performance quickly and accurately on-site.
