{"id":7296,"date":"2026-07-17T15:51:20","date_gmt":"2026-07-17T15:51:20","guid":{"rendered":"https:\/\/europascal.de\/product\/additel-adt-761a-llp\/"},"modified":"2026-10-22T09:08:49","modified_gmt":"2026-10-22T09:08:49","slug":"additel-adt-761a-llp","status":"publish","type":"product","link":"https:\/\/europascal.de\/en\/product\/additel-adt-761a-llp\/","title":{"rendered":"Additel ADT 761A-LLP Precise Low Pressure Calibrator"},"content":{"rendered":"<p>The <strong>Additel ADT 761A-LLP Low Pressure Calibrator<\/strong> is a fully automated portable pneumatic calibration system specifically designed for precise low and differential pressure applications. With integrated pressure generation, automatic closed-loop control, interchangeable internal pressure modules and comprehensive electrical process functions, the ADT 761A-LLP provides a powerful all-in-one solution for demanding low-pressure calibration tasks.<\/p>\n<p>The pressure range extends from:<\/p>\n<p><strong>-75 to +75 mbar<\/strong><\/p>\n<p>or:<\/p>\n<p><strong>-30 to +30 inH\u2082O<\/strong><\/p>\n<p>The ADT 761A-LLP supports:<\/p>\n<p><strong>Gauge Pressure<\/strong><\/p>\n<p>and:<\/p>\n<p><strong>Differential Pressure<\/strong><\/p>\n<p>with a specified pressure accuracy of:<\/p>\n<p><strong>0.05 % FS<\/strong><\/p>\n<p>and exceptional pressure control stability of:<\/p>\n<p><strong>0.003 % FS or 0.05 Pa<\/strong><\/p>\n<p>The instrument is specifically optimized for very low pressure applications where stable generation and precise control of small differential pressures are essential.<\/p>\n<p>This makes the Additel ADT 761A-LLP ideal for calibrating differential pressure transmitters, low-pressure sensors, filter monitoring instrumentation, HVAC measurement equipment, cleanroom pressure instruments and other devices operating in the low-pressure range.<\/p>\n<p>The <a href=\"https:\/\/europascal.de\/en\/calibration-services\/\">europascal calibration service<\/a> provides professional calibration solutions for low-pressure calibrators, differential pressure instruments, pressure modules, transmitters, pressure sensors and digital pressure gauges.<\/p>\n<h2>Your Benefits at a Glance<\/h2>\n<p>The <strong>Additel ADT 761A-LLP Low Pressure Calibrator<\/strong> provides:<\/p>\n<ul>\n<li>Fully automatic low-pressure generation<\/li>\n<li>Pressure range from -75 to +75 mbar<\/li>\n<li>Pressure range from -30 to +30 inH\u2082O<\/li>\n<li>Gauge pressure measurement<\/li>\n<li>Differential pressure measurement<\/li>\n<li>0.05 % FS pressure accuracy<\/li>\n<li>0.003 % FS or 0.05 Pa control stability<\/li>\n<li>Typical response time of \u226440 seconds<\/li>\n<li>Two removable internal pressure modules<\/li>\n<li>Two external pressure module connections<\/li>\n<li>Integrated electric pump<\/li>\n<li>Automatic closed-loop pressure control<\/li>\n<li>Electrical process measurement<\/li>\n<li>High-resolution mA measurement<\/li>\n<li>Voltage measurement<\/li>\n<li>mA source and simulation<\/li>\n<li>24 V loop power<\/li>\n<li>Pressure switch testing<\/li>\n<li>HART communication<\/li>\n<li>PROFIBUS PA communication<\/li>\n<li>Automated calibration tasks<\/li>\n<li>Task documentation<\/li>\n<li>Integrated data logging<\/li>\n<li>Wi-Fi<\/li>\n<li>Bluetooth<\/li>\n<li>USB<\/li>\n<li>Ethernet<\/li>\n<li>Portable design<\/li>\n<li>Suitable for laboratory and field calibration<\/li>\n<\/ul>\n<h2>Automatic Low Pressure Generation from -75 to +75 mbar<\/h2>\n<p>The key feature of the <strong>Additel ADT 761A-LLP<\/strong> is its ability to automatically generate and control very low pneumatic pressures.<\/p>\n<p>Its operating range extends from:<\/p>\n<p><strong>-75 to +75 mbar<\/strong><\/p>\n<p>which corresponds to:<\/p>\n<p><strong>-7.5 to +7.5 kPa<\/strong><\/p>\n<p>or approximately:<\/p>\n<p><strong>-30 to +30 inH\u2082O<\/strong><\/p>\n<p>An integrated electric pump generates the required pressure automatically.<\/p>\n<p>The operator selects a pressure setpoint and the calibrator automatically:<\/p>\n<ol start=\"1\">\n<li>Generates the required pressure<\/li>\n<li>Approaches the setpoint<\/li>\n<li>Regulates the pressure<\/li>\n<li>Stabilizes the pressure<\/li>\n<li>Measures the resulting reference pressure<\/li>\n<\/ol>\n<p>This eliminates much of the manual pressure adjustment normally associated with low differential pressure calibration.<\/p>\n<h2>Gauge and Differential Pressure<\/h2>\n<p>The ADT 761A-LLP supports both:<\/p>\n<p><strong>Gauge Pressure<\/strong><\/p>\n<p>and:<\/p>\n<p><strong>Differential Pressure<\/strong><\/p>\n<p>Gauge pressure is measured relative to atmospheric pressure.<\/p>\n<p>Differential pressure is defined as the pressure difference between two pressure ports:<\/p>\n<p><strong>\u0394p = pHigh &#8211; pLow<\/strong><\/p>\n<p>Differential pressure measurement is especially important in applications where relatively small pressure differences must be measured accurately.<\/p>\n<p>The ADT 761A-LLP is specifically designed for these demanding low-pressure applications.<\/p>\n<h2>Pressure Accuracy of 0.05 % FS<\/h2>\n<p>Additel specifies the pressure accuracy of the <strong>ADT 761A-LLP<\/strong> as:<\/p>\n<p><strong>0.05 % FS<\/strong><\/p>\n<p>FS refers to the span of the installed pressure module.<\/p>\n<p>The manufacturer&#8217;s specification is a one-year accuracy including one-year stability.<\/p>\n<p>The use of interchangeable internal pressure modules allows the pressure range to be better matched to the device under test.<\/p>\n<p>This is particularly useful in low-pressure calibration, where selecting an appropriately sized reference range can have a significant influence on the absolute measurement uncertainty.<\/p>\n<h2>Exceptional Low Pressure Control Stability<\/h2>\n<p>The pressure control stability of the ADT 761A-LLP is specified as:<\/p>\n<p><strong>0.003 % FS or 0.05 Pa<\/strong><\/p>\n<p>This extremely small absolute pressure value demonstrates why the LLP configuration is specifically designed for low-pressure applications.<\/p>\n<p>Stable pressure generation is especially important when calibrating sensitive differential pressure instruments because even very small pressure fluctuations can influence the displayed measurement value.<\/p>\n<p>The ADT 761A-LLP automatically regulates the generated pressure to maintain stable calibration conditions.<\/p>\n<h2>Typical Response Time \u226440 Seconds<\/h2>\n<p>Additel specifies a typical response time of:<\/p>\n<p><strong>\u226440 seconds<\/strong><\/p>\n<p>for the ADT 761A-LLP.<\/p>\n<p>This specification is particularly relevant for low-pressure calibration because very small pressures can require careful regulation and stabilization.<\/p>\n<p>Automatic pressure generation and control reduce the amount of manual intervention required during multipoint calibration procedures.<\/p>\n<h2>Two Removable Internal Pressure Modules<\/h2>\n<p>The <strong>Additel ADT 761A-LLP<\/strong> accommodates:<\/p>\n<p><strong>two removable internal pressure modules<\/strong><\/p>\n<p>This allows different low-pressure ranges to be combined within one calibration system.<\/p>\n<p>The ability to use multiple pressure ranges is particularly valuable because pressure module accuracy is specified relative to the module span.<\/p>\n<p>Using a smaller-range module for very low pressure applications can therefore improve the absolute measurement capability compared with using only the maximum \u00b175 mbar range.<\/p>\n<h2>Six-Digit Pressure Resolution<\/h2>\n<p>The ADT761A platform provides high-resolution pressure indication.<\/p>\n<p>The LLP configuration offers:<\/p>\n<p><strong>6-digit pressure resolution<\/strong><\/p>\n<p>and compatible high-precision module configurations can provide additional resolution.<\/p>\n<p>This is particularly valuable for very low pressure measurements, where small changes in pressure need to be clearly resolved.<\/p>\n<h2>Wide Selection of Pressure Units<\/h2>\n<p>The ADT 761A-LLP supports numerous pressure units, including:<\/p>\n<ul>\n<li>Pa<\/li>\n<li>hPa<\/li>\n<li>kPa<\/li>\n<li>bar<\/li>\n<li>mbar<\/li>\n<li>psi<\/li>\n<li>mmHg<\/li>\n<li>inHg<\/li>\n<li>inH\u2082O<\/li>\n<li>mmH\u2082O<\/li>\n<li>cmH\u2082O<\/li>\n<li>torr<\/li>\n<\/ul>\n<p>Additional customizable units are also supported.<\/p>\n<p>This is especially useful for HVAC and differential pressure applications, where units such as Pa, mbar and inH\u2082O are commonly used.<\/p>\n<h2>Two External Pressure Module Connections<\/h2>\n<p>In addition to its two internal pressure modules, the ADT761A platform provides connections for:<\/p>\n<p><strong>two external pressure modules<\/strong><\/p>\n<p>Compatible Additel intelligent digital pressure modules can therefore be connected for additional pressure measurement ranges.<\/p>\n<p>This expands the pressure measurement capability of the calibration platform.<\/p>\n<p>External pressure modules do not increase the automatic pressure-generation range of the internal LLP pressure system.<\/p>\n<h2>Differential Pressure Transmitter Calibration<\/h2>\n<p>One of the primary applications for the <strong>Additel ADT 761A-LLP<\/strong> is the calibration of differential pressure transmitters.<\/p>\n<p>A differential pressure transmitter measures:<\/p>\n<p><strong>\u0394p = pHigh &#8211; pLow<\/strong><\/p>\n<p>and typically converts the pressure difference into an electrical output signal.<\/p>\n<p>A common industrial output is:<\/p>\n<p><strong>4\u201320 mA<\/strong><\/p>\n<p>The ADT 761A-LLP can automatically generate the required differential pressure while simultaneously measuring the electrical transmitter output.<\/p>\n<p>This combines pressure and electrical calibration in one workflow.<\/p>\n<h2>HVAC Applications<\/h2>\n<p>Low differential pressures are widely used in:<\/p>\n<ul>\n<li>Heating systems<\/li>\n<li>Ventilation systems<\/li>\n<li>Air-conditioning systems<\/li>\n<li>Building automation<\/li>\n<li>Airflow monitoring<\/li>\n<li>Filter monitoring<\/li>\n<\/ul>\n<p>For example, the pressure drop across an air filter can provide information about its condition.<\/p>\n<p>As contamination increases, the differential pressure across the filter generally increases.<\/p>\n<p>Differential pressure transmitters used for this purpose require periodic verification and calibration.<\/p>\n<p>The <strong>Additel ADT 761A-LLP<\/strong> provides an automatic solution for these low-pressure calibration tasks.<\/p>\n<h2>Cleanroom Pressure Calibration<\/h2>\n<p>Cleanrooms frequently use small pressure differences between adjacent rooms or zones to control airflow direction and reduce contamination transfer.<\/p>\n<p>These pressure differences may be only a few pascals.<\/p>\n<p>Reliable differential pressure measurement is therefore essential.<\/p>\n<p>The excellent pressure control capability of the ADT 761A-LLP makes it particularly suitable for calibration of instrumentation used in:<\/p>\n<ul>\n<li>Pharmaceutical cleanrooms<\/li>\n<li>Laboratories<\/li>\n<li>Medical facilities<\/li>\n<li>Semiconductor production<\/li>\n<li>Controlled manufacturing environments<\/li>\n<\/ul>\n<h2>Filter Monitoring<\/h2>\n<p>Differential pressure is frequently used to monitor filters.<\/p>\n<p>The pressure difference between the upstream and downstream sides of a filter changes as the filter becomes contaminated.<\/p>\n<p>Typical applications include:<\/p>\n<ul>\n<li>HVAC filters<\/li>\n<li>Industrial air filters<\/li>\n<li>Process filters<\/li>\n<li>Cleanroom filtration<\/li>\n<li>Ventilation systems<\/li>\n<\/ul>\n<p>The ADT 761A-LLP can be used to apply defined differential pressures to the corresponding transmitters and sensors.<\/p>\n<h2>Flow Measurement Applications<\/h2>\n<p>Differential pressure is also widely used for flow measurement.<\/p>\n<p>A primary flow element creates a pressure difference related to the flow rate.<\/p>\n<p>Examples include:<\/p>\n<ul>\n<li>Orifice plates<\/li>\n<li>Venturi tubes<\/li>\n<li>Flow nozzles<\/li>\n<li>Pitot tubes<\/li>\n<\/ul>\n<p>The associated differential pressure transmitter converts this pressure difference into an electrical measurement signal.<\/p>\n<p>The ADT 761A-LLP can be used to calibrate the differential pressure measurement component of such systems.<\/p>\n<h2>Electrical Process Measurement<\/h2>\n<p>The ADT761A platform includes comprehensive electrical process measurement functions.<\/p>\n<p>Current measurement includes a:<\/p>\n<p><strong>-25 to +25 mA<\/strong><\/p>\n<p>range with:<\/p>\n<p><strong>0.1 \u00b5A resolution<\/strong><\/p>\n<p>and specified accuracy of:<\/p>\n<p><strong>\u00b1(0.008 % RD + 1.0 \u00b5A)<\/strong><\/p>\n<p>Additional current and voltage ranges are available.<\/p>\n<p>This allows the electrical output of pressure transmitters to be measured directly during pressure calibration.<\/p>\n<h2>Voltage Measurement<\/h2>\n<p>The ADT761A provides several voltage measurement ranges extending up to:<\/p>\n<p><strong>\u00b130 V<\/strong><\/p>\n<p>This makes the calibrator suitable for pressure sensors and process instrumentation with voltage outputs.<\/p>\n<p>Pressure and electrical signals can therefore be evaluated using one integrated calibration system.<\/p>\n<h2>mA Source and Simulation<\/h2>\n<p>The ADT761A can also generate current signals.<\/p>\n<p>Available mA source ranges include:<\/p>\n<p><strong>0 to 2.5 mA<\/strong><\/p>\n<p>and:<\/p>\n<p><strong>2.5 to 25 mA<\/strong><\/p>\n<p>This functionality expands the instrument beyond pressure measurement and supports additional process calibration applications.<\/p>\n<h2>24 V Loop Power<\/h2>\n<p>The <strong>Additel ADT 761A-LLP<\/strong> provides:<\/p>\n<p><strong>24 V loop power<\/strong><\/p>\n<p>with a maximum load of:<\/p>\n<p><strong>50 mA<\/strong><\/p>\n<p>This allows compatible two-wire pressure transmitters to be powered directly by the calibrator.<\/p>\n<p>The ADT 761A-LLP can therefore:<\/p>\n<ul>\n<li>Generate the reference pressure<\/li>\n<li>Supply the transmitter<\/li>\n<li>Measure the transmitter output<\/li>\n<\/ul>\n<p>using one integrated instrument.<\/p>\n<h2>Pressure Switch Testing<\/h2>\n<p>The ADT761A platform supports testing of:<\/p>\n<ul>\n<li>Mechanical pressure switches<\/li>\n<li>NPN switches<\/li>\n<li>PNP switches<\/li>\n<\/ul>\n<p>The automatic pressure controller can approach switching points in a controlled manner.<\/p>\n<p>This allows parameters such as:<\/p>\n<ul>\n<li>Switching pressure<\/li>\n<li>Reset pressure<\/li>\n<li>Hysteresis<\/li>\n<\/ul>\n<p>to be determined.<\/p>\n<h2>HART Communication<\/h2>\n<p>The <strong>Additel ADT 761A-LLP<\/strong> supports:<\/p>\n<p><strong>HART communication<\/strong><\/p>\n<p>for compatible smart pressure transmitters.<\/p>\n<p>HART communication can support functions such as:<\/p>\n<ul>\n<li>Device identification<\/li>\n<li>Digital process value reading<\/li>\n<li>Configuration<\/li>\n<li>Diagnostics<\/li>\n<li>Calibration workflows<\/li>\n<\/ul>\n<p>This is particularly useful for modern differential pressure transmitters.<\/p>\n<h2>PROFIBUS PA Communication<\/h2>\n<p>The ADT761A platform also supports:<\/p>\n<p><strong>PROFIBUS PA<\/strong><\/p>\n<p>communication.<\/p>\n<p>This enables compatible digital process instruments to be incorporated into calibration and maintenance workflows.<\/p>\n<h2>Automated Calibration Tasks<\/h2>\n<p>The <strong>Additel ADT 761A-LLP<\/strong> supports automated calibration tasks and task documentation.<\/p>\n<p>A predefined calibration procedure can contain multiple increasing and decreasing pressure points.<\/p>\n<p>The calibrator automatically generates and stabilizes the required pressure points and supports recording of the measurement results.<\/p>\n<p>This improves repeatability and reduces manual work.<\/p>\n<h2>Integrated Data Logging<\/h2>\n<p>The ADT761A provides integrated data logging.<\/p>\n<p>Measurement data can be recorded directly by the instrument for applications such as:<\/p>\n<ul>\n<li>Calibration documentation<\/li>\n<li>Pressure stability testing<\/li>\n<li>Long-term measurements<\/li>\n<li>Sensor evaluation<\/li>\n<li>Process monitoring<\/li>\n<li>Troubleshooting<\/li>\n<\/ul>\n<p>This makes the ADT 761A-LLP useful not only as a pressure calibrator but also as a portable measurement and diagnostic system.<\/p>\n<h2>Modern Communication Interfaces<\/h2>\n<p>The <strong>Additel ADT 761A-LLP<\/strong> provides:<\/p>\n<ul>\n<li>Wi-Fi<\/li>\n<li>Bluetooth<\/li>\n<li>USB<\/li>\n<li>Ethernet<\/li>\n<\/ul>\n<p>These interfaces support integration into modern digital calibration environments.<\/p>\n<p>They also simplify data transfer and communication with compatible computers and peripheral equipment.<\/p>\n<h2>Technical Highlights<\/h2>\n<p><strong>Model:<\/strong> Additel ADT 761A-LLP<\/p>\n<p><strong>Device type:<\/strong> Automatic Low Pressure Calibrator<\/p>\n<p><strong>Pressure range:<\/strong> -75 to +75 mbar<\/p>\n<p><strong>Pressure range:<\/strong> -7.5 to +7.5 kPa<\/p>\n<p><strong>Pressure range:<\/strong> -30 to +30 inH\u2082O<\/p>\n<p><strong>Pressure types:<\/strong> Differential and Gauge<\/p>\n<p><strong>Absolute pressure:<\/strong> No<\/p>\n<p><strong>Pressure accuracy:<\/strong> 0.05 % FS<\/p>\n<p><strong>Pressure control stability:<\/strong> 0.003 % FS or 0.05 Pa<\/p>\n<p><strong>Typical response time:<\/strong> \u226440 seconds<\/p>\n<p><strong>Internal pressure modules:<\/strong> 2<\/p>\n<p><strong>Internal modules:<\/strong> Removable<\/p>\n<p><strong>External pressure modules:<\/strong> 2<\/p>\n<p><strong>Pressure resolution:<\/strong> 6 digits<\/p>\n<p><strong>Pressure generation:<\/strong> Integrated electric pump<\/p>\n<p><strong>Pressure control:<\/strong> Fully automatic<\/p>\n<p><strong>Electrical process measurement:<\/strong> Yes<\/p>\n<p><strong>mA measurement:<\/strong> Yes<\/p>\n<p><strong>Voltage measurement:<\/strong> Yes<\/p>\n<p><strong>mA source:<\/strong> Yes<\/p>\n<p><strong>24 V loop power:<\/strong> Yes<\/p>\n<p><strong>Pressure switch testing:<\/strong> Yes<\/p>\n<p><strong>HART:<\/strong> Yes<\/p>\n<p><strong>PROFIBUS PA:<\/strong> Yes<\/p>\n<p><strong>Task documentation:<\/strong> Yes<\/p>\n<p><strong>Data logging:<\/strong> Yes<\/p>\n<p><strong>Wi-Fi:<\/strong> Yes<\/p>\n<p><strong>Bluetooth:<\/strong> Yes<\/p>\n<p><strong>USB:<\/strong> Yes<\/p>\n<p><strong>Ethernet:<\/strong> Yes<\/p>\n<h2>Technical Data<\/h2>\n<table>\n<tbody>\n<tr>\n<th>Feature<\/th>\n<th>Additel ADT 761A-LLP<\/th>\n<\/tr>\n<tr>\n<td>Device type<\/td>\n<td>Automatic Low Pressure Calibrator<\/td>\n<\/tr>\n<tr>\n<td>Pressure range<\/td>\n<td>-75 to +75 mbar<\/td>\n<\/tr>\n<tr>\n<td>Pressure range<\/td>\n<td>-7.5 to +7.5 kPa<\/td>\n<\/tr>\n<tr>\n<td>Pressure range<\/td>\n<td>-30 to +30 inH\u2082O<\/td>\n<\/tr>\n<tr>\n<td>Pressure types<\/td>\n<td>Differential \/ Gauge<\/td>\n<\/tr>\n<tr>\n<td>Absolute pressure<\/td>\n<td>No<\/td>\n<\/tr>\n<tr>\n<td>Accuracy<\/td>\n<td>0.05 % FS<\/td>\n<\/tr>\n<tr>\n<td>Control stability<\/td>\n<td>0.003 % FS or 0.05 Pa<\/td>\n<\/tr>\n<tr>\n<td>Typical response time<\/td>\n<td>\u226440 seconds<\/td>\n<\/tr>\n<tr>\n<td>Internal pressure modules<\/td>\n<td>2<\/td>\n<\/tr>\n<tr>\n<td>Internal modules removable<\/td>\n<td>Yes<\/td>\n<\/tr>\n<tr>\n<td>External pressure modules<\/td>\n<td>2<\/td>\n<\/tr>\n<tr>\n<td>Pressure resolution<\/td>\n<td>6 digits<\/td>\n<\/tr>\n<tr>\n<td>Automatic pressure generation<\/td>\n<td>Yes<\/td>\n<\/tr>\n<tr>\n<td>Integrated electric pump<\/td>\n<td>Yes<\/td>\n<\/tr>\n<tr>\n<td>Electrical process calibration<\/td>\n<td>Yes<\/td>\n<\/tr>\n<tr>\n<td>mA \/ V measurement<\/td>\n<td>Yes<\/td>\n<\/tr>\n<tr>\n<td>mA source<\/td>\n<td>Yes<\/td>\n<\/tr>\n<tr>\n<td>24 V loop power<\/td>\n<td>Yes<\/td>\n<\/tr>\n<tr>\n<td>Pressure switch test<\/td>\n<td>Yes<\/td>\n<\/tr>\n<tr>\n<td>HART<\/td>\n<td>Yes<\/td>\n<\/tr>\n<tr>\n<td>PROFIBUS PA<\/td>\n<td>Yes<\/td>\n<\/tr>\n<tr>\n<td>Task documentation<\/td>\n<td>Yes<\/td>\n<\/tr>\n<tr>\n<td>Data logging<\/td>\n<td>Yes<\/td>\n<\/tr>\n<tr>\n<td>Communication<\/td>\n<td>Wi-Fi, Bluetooth, USB, Ethernet<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>ADT 761A-LLP vs. ADT 761A-D<\/h2>\n<p>The ADT 761A-LLP and ADT 761A-D both support gauge and differential pressure, but they are optimized for very different pressure ranges.<\/p>\n<table>\n<tbody>\n<tr>\n<th>Feature<\/th>\n<th>ADT 761A-LLP<\/th>\n<th>ADT 761A-D<\/th>\n<\/tr>\n<tr>\n<td>Pressure range<\/td>\n<td>-75 to +75 mbar<\/td>\n<td>-0.95 to +2.5 bar<\/td>\n<\/tr>\n<tr>\n<td>Pressure types<\/td>\n<td>Gauge \/ Differential<\/td>\n<td>Gauge \/ Differential<\/td>\n<\/tr>\n<tr>\n<td>Accuracy<\/td>\n<td>0.05 % FS<\/td>\n<td>0.02 % FS<\/td>\n<\/tr>\n<tr>\n<td>Control stability<\/td>\n<td>0.003 % FS or 0.05 Pa<\/td>\n<td>0.003 % FS<\/td>\n<\/tr>\n<tr>\n<td>Internal modules<\/td>\n<td>2<\/td>\n<td>2<\/td>\n<\/tr>\n<tr>\n<td>External modules<\/td>\n<td>2<\/td>\n<td>2<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>The <strong>ADT 761A-LLP<\/strong> is the preferred configuration when very small differential pressures need to be generated and controlled.<\/p>\n<p>The ADT 761A-D extends the positive pressure range to 2.5 bar and is therefore more suitable for higher differential and gauge pressure applications.<\/p>\n<h2>ADT 761A Series Overview<\/h2>\n<p>The ADT761A family covers a wide range of automated pneumatic calibration applications.<\/p>\n<table>\n<tbody>\n<tr>\n<th>Model<\/th>\n<th>Pressure Range<\/th>\n<th>Pressure Type<\/th>\n<\/tr>\n<tr>\n<td><strong>ADT 761A-LLP<\/strong><\/td>\n<td><strong>-75 to +75 mbar<\/strong><\/td>\n<td><strong>Gauge \/ Differential<\/strong><\/td>\n<\/tr>\n<tr>\n<td>ADT 761A-D<\/td>\n<td>-0.95 to +2.5 bar<\/td>\n<td>Gauge \/ Differential<\/td>\n<\/tr>\n<tr>\n<td>ADT 761A-500<\/td>\n<td>-0.9 to +35 bar<\/td>\n<td>Gauge \/ Absolute<\/td>\n<\/tr>\n<tr>\n<td>ADT 761A-1K<\/td>\n<td>-0.9 to +70 bar<\/td>\n<td>Gauge \/ Absolute<\/td>\n<\/tr>\n<tr>\n<td>ADT 761A-1.5K<\/td>\n<td>-0.9 to +100 bar<\/td>\n<td>Gauge \/ Absolute<\/td>\n<\/tr>\n<tr>\n<td>ADT 761A-BP<\/td>\n<td>100 to 1,200 hPa<\/td>\n<td>Absolute<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>The <strong>ADT 761A-LLP<\/strong> is therefore the dedicated very-low-pressure configuration of the ADT761A family.<\/p>\n<h2>Typical Calibration Applications<\/h2>\n<p>The <strong>Additel ADT 761A-LLP Low Pressure Calibrator<\/strong> is particularly suitable for calibration and testing of:<\/p>\n<ul>\n<li>Differential pressure transmitters<\/li>\n<li>Low-pressure sensors<\/li>\n<li>Low-pressure transducers<\/li>\n<li>Differential pressure gauges<\/li>\n<li>HVAC pressure instruments<\/li>\n<li>Cleanroom pressure transmitters<\/li>\n<li>Filter monitoring sensors<\/li>\n<li>Airflow-related differential pressure instrumentation<\/li>\n<li>4\u201320 mA pressure transmitters<\/li>\n<li>HART pressure transmitters<\/li>\n<li>PROFIBUS PA instruments<\/li>\n<li>Low-pressure switches<\/li>\n<\/ul>\n<p>Typical users include:<\/p>\n<ul>\n<li>Professional calibration laboratories<\/li>\n<li>HVAC service companies<\/li>\n<li>Pharmaceutical industry<\/li>\n<li>Cleanroom operators<\/li>\n<li>Building automation<\/li>\n<li>Process industry<\/li>\n<li>Instrument manufacturers<\/li>\n<li>Environmental monitoring<\/li>\n<li>Quality assurance departments<\/li>\n<li>Mobile calibration services<\/li>\n<\/ul>\n<h2>Calibration and Service by europascal<\/h2>\n<p>Low differential pressure calibration places particularly high demands on pressure stability, suitable reference ranges and the calibration setup.<\/p>\n<p>When two internal pressure modules are installed, both modules should be considered when defining the calibration scope.<\/p>\n<p>The pressure connections and tubing arrangement can also influence low-pressure measurements and should be carefully selected.<\/p>\n<p>The <a href=\"https:\/\/europascal.de\/en\/calibration-services\/\">europascal calibration service<\/a> provides professional calibration solutions for automatic low-pressure calibrators, differential pressure instruments, pressure modules, pressure sensors, pressure transmitters and digital pressure gauges.<\/p>\n<p>europascal can also support customers in selecting suitable internal pressure modules, external pressure modules, accessories and calibration configurations.<\/p>\n<h2>Why Choose the Additel ADT 761A-LLP?<\/h2>\n<p>The <strong>Additel ADT 761A-LLP Precise Low Pressure Calibrator<\/strong> combines automatic pressure generation from <strong>-75 to +75 mbar<\/strong>, <strong>0.05 % FS accuracy<\/strong> and exceptional <strong>0.003 % FS or 0.05 Pa pressure control stability<\/strong>.<\/p>\n<p>Its gauge and differential pressure capability makes it particularly suitable for demanding low-pressure applications such as HVAC, cleanrooms, filter monitoring and differential pressure transmitter calibration.<\/p>\n<p>Two removable internal pressure modules provide flexibility for different low-pressure ranges, while two external pressure module connections further expand measurement capability.<\/p>\n<p>Integrated electrical process measurement, mA sourcing, 24 V loop power, pressure switch testing, HART and PROFIBUS PA communication, automated calibration tasks and data logging make the ADT 761A-LLP a complete calibration platform for professional laboratory and field applications.<\/p>\n<p><strong>Looking for an automated solution for precise low and differential pressure calibration? Contact europascal for expert advice on the Additel ADT 761A-LLP, suitable pressure module configurations, accessories and professional calibration services.<\/strong><\/p>\n<p><a href=\"https:\/\/europascal.de\/en\/product\/additel-adt-761a\/\">Further information about the Additel ADT 761A series from europascal can be found here.<\/a><\/p>\n<p><a href=\"https:\/\/europascal.de\/en\/product-category\/pressure\/pressure-controller-calibrator-indicator\/\">Further pressure calibration products from europascal can be found here.<\/a><\/p>\n<p><a href=\"https:\/\/additel.com\/products\/Pressure-Calibrators\/\" target=\"_blank\" rel=\"noopener\">Manufacturer information about the Additel ADT 761A-LLP can be found on the official Additel website.<\/a><\/p>\n<p><a class=\"download-datasheet\" href=\"#\" data-pdf=\"https:\/\/europascal.de\/wp-content\/uploads\/2026\/07\/Additel-ADT-761A-Automated-Pressure-Calibrators-20260326.pdf\"> <span style=\"color: #0000ff;\"><strong><em>Download Datasheet<\/em><\/strong><\/span> <\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The <strong>Additel ADT 761A-LLP Low Pressure Calibrator<\/strong> is a portable, fully automated pneumatic calibration system specifically designed for <strong>gauge and differential pressure from -75 to +75 mbar (-30 to +30 inH\u2082O)<\/strong>. With <strong>0.05 % FS accuracy<\/strong>, exceptional <strong>0.003 % FS or 0.05 Pa control stability<\/strong>, two removable internal pressure modules and automatic pressure generation, the ADT 761A-LLP is ideal for differential pressure transmitters, HVAC systems, cleanroom instrumentation and other demanding low-pressure applications. Integrated electrical process functions, HART and PROFIBUS PA communication, task documentation and data logging support complete automated calibration workflows.<\/p>\n","protected":false},"featured_media":6359,"template":"","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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